Press n or j to go to the next uncovered block, b, p or k for the previous block.
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32x 32x 32x 32x 32x 32x 32x 32x 32x 32x 32x 668x 668x 668x 668x 668x 668x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 81x 49x 49x 81x 49x 49x 81x 81x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 60x 49x 49x 60x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 113x 49x 49x 49x 49x 49x 49x 113x 668x 668x 668x 668x 668x 1100x 1049x 1085x 1049x 1049x 1049x 1049x 1085x 212x 212x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1048x 1100x 138x 138x 1037x 1079x 210x 210x 210x 1036x 1036x 1036x 1036x 1036x 1036x 1100x 1021x 1021x 1100x 13x 1x 1x 1x 13x 3x 3x 9x 1085x 1049x 1049x 1049x 1100x 668x 668x 668x 668x 668x 668x 1049x 1049x 1049x 1049x 3x 3x 1049x 668x 668x 668x 668x 668x 668x 668x 668x 129x 129x 668x 668x 668x 668x 668x 668x 668x 32x 32x 668x 668x 668x 668x 668x 1155x 3x 3x 1152x 1152x 998x 998x 1152x 1155x 1x 1x 1151x 1151x 1151x 1151x 1151x 1151x 1151x 1154x 53x 53x 53x 1098x 1139x 529x 529x 529x 1155x 668x 668x 668x 668x 668x 668x 668x 668x 639x 639x 639x 639x 639x 639x 639x 639x 639x 639x 639x 639x 639x 10x 10x 629x 629x 629x 629x 629x 629x 629x 629x 629x 65x 6x 6x 6x 6x 6x 6x 6x 63x 59x 59x 629x 629x 629x 629x 639x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 82x 82x 82x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 32x 32x 2x 2x 2x 32x 668x 668x 668x 668x 668x 668x 668x 668x 12x 12x 12x 12x 20x 20x 12x 12x 12x 12x 12x 12x 12x 12x 12x 17x 17x 12x 12x 12x 12x 12x 12x 12x 668x 668x 668x 668x 668x 668x 668x 1070x 1070x 1070x 1070x 1070x 23x 23x 23x 23x 23x 15x 15x 5x 23x 23x 23x 10x 10x 10x 10x 10x 10x 10x 3x 3x 12x 3x 10x 7x 13x 7x 7x 10x 10x 23x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1070x 1070x 668x 668x 668x 668x 668x 668x 668x 1140x 1140x 1140x 1140x 1140x 1140x 97x 97x 97x 187x 187x 187x 187x 30x 30x 157x 157x 157x 67x 67x 1140x 1140x 668x 668x 668x 668x 668x 668x 560x 533x 533x 560x 668x 668x 668x 668x 668x 668x 668x 540x 540x 540x 540x 540x 540x 540x 540x 540x 63x 63x 63x 101x 101x 101x 101x 10x 10x 91x 91x 91x 53x 53x 53x 63x 53x 53x 53x 540x 540x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 3x 3x 3x 3x 3x 8x 6x 6x 8x 8x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 12x 6x 3x 6x 6x 3x 3x 3x 3x 668x 668x 668x 668x 668x 668x 668x 26x 26x 26x 26x 26x 26x 28x 8x 8x 8x 8x 8x 8x 8x 28x 20x 20x 26x 26x 26x 26x 26x 26x 26x 26x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 22x 23x 22x 22x 22x 22x 15x 15x 4x 22x 22x 22x 11x 11x 11x 11x 11x 11x 11x 22x 22x 22x 22x 22x 26x 26x 26x 668x 668x 668x 668x 668x 668x 333x 333x 333x 333x 333x 333x 333x 333x 668x 668x 668x 668x 668x 668x 350x 350x 350x 350x 350x 350x 300x 300x 350x 350x 350x 350x 668x 668x 668x 668x 668x 668x 195x 195x 192x 192x 192x 195x 2x 2x 2x 195x 668x 668x 668x 668x 668x 668x 668x 8x 8x 668x 668x 668x 668x 668x 668x 668x 1x 1x 668x 668x 668x 668x 668x 668x 192x 192x 192x 192x 192x 192x 179x 179x 192x 192x 192x 192x 155x 155x 192x 192x 192x 192x 192x 192x 192x 24x 24x 24x 192x 192x 192x 192x 192x 192x 192x 7x 7x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 192x 185x 185x 185x 185x 185x 185x 185x 185x 185x 185x 185x 185x 185x 185x 184x 184x 184x 184x 184x 184x 192x 1x 1x 192x 192x 192x 192x 192x 192x 192x 192x 192x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 23x 23x 23x 8x 3x 3x 8x 23x 23x 8x 8x 23x 668x 668x 668x 668x 668x 668x 629x 98x 101x 97x 97x 101x 1x 532x 629x 668x 668x 668x 668x 668x 668x 668x 668x 668x 244x 244x 668x 668x 668x 668x 668x 668x 260x 260x 668x 668x 668x 668x 668x 668x 30x 30x 668x 668x 668x 668x 668x 668x 6x 6x 668x 668x 668x 668x 668x 668x 668x 4x 4x 668x 668x 668x 668x 668x 668x 332x 332x 668x 668x 668x 668x 668x 668x 639x 639x 639x 639x 5x 5x 639x 639x 4x 6x 6x 10x 1x 1x 5x 10x 8x 8x 8x 8x 8x 2x 2x 2x 2x 2x 2x 8x 8x 8x 32x 32x 6x 6x 6x 26x 32x 4x 4x 26x 26x 26x 32x 6x 6x 6x 26x 26x 8x 8x 8x 8x 8x 639x 668x 668x 668x 668x 668x 668x 668x 668x 32x 32x 32x 32x 58x 29x 29x 26x 26x 29x 32x 32x 6x 32x 668x 668x 668x 668x 668x 668x 668x 668x 668x 29x 29x 29x 29x 29x 29x 29x 29x 6x 29x 23x 23x 29x 668x 668x 668x 668x 668x 668x 668x 668x 668x 26x 20x 20x 2x 2x 18x 18x 6x 6x 26x 26x 26x 6x 26x 26x 26x 6x 26x 26x 668x 668x 668x 668x 668x 668x 639x 639x 639x 639x 5x 639x 639x 639x 4x 4x 4x 2x 4x 4x 4x 4x 639x 668x 668x 668x 668x 668x 668x 668x 6x 5x 5x 6x 6x 6x 6x 6x 6x 6x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 1119x 4x 5x 5x 5x 5x 4x 1119x 668x 668x 668x 668x 668x 1048x 5x 15x 1048x 1048x 5x 1048x 1048x 5x 5x 7x 1x 1x 7x 5x 1048x 668x 668x 668x 668x 668x 668x 668x 668x 668x 6x 6x 6x 6x 6x 6x 6x 668x 668x 668x 668x 668x 668x 6793x 1004x 1004x 5844x 563x 563x 5226x 5797x 5057x 5057x 11199x 8x 8x 8x 8x 11199x 11199x 5057x 5226x 6793x 668x 668x 668x 668x 668x 668x 181x 181x 668x 668x 668x 668x 668x 668x 668x 1395x 1395x 25x 9x 25x 25x 1395x 1395x 132x 132x 1395x 1395x 141x 141x 141x 141x 141x 141x 15x 2x 2x 13x 13x 13x 141x 1395x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 668x 29x 29x 29x 29x 31x 31x 2x 2x 2x 31x 31x 31x 3x 3x 31x 31x 3x 3x 3x 3x 3x 2x 2x 3x 3x 3x 3x 2x 2x 3x 29x 29x 29x 27x 27x 29x 15x 15x 15x 12x 15x 11x 11x 11x 11x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 29x 29x 29x 29x 29x 29x 668x 668x 668x 668x 668x 668x 668x 1069x 1069x 1069x 1069x 1069x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1069x 668x 668x 668x 668x 668x 668x 668x 1x 1x 1x 1x 1x 1x 1x 1x 668x 668x 668x 668x 668x 668x 668x 10x 10x 10x 10x 10x 10x 1x 1x 10x 10x 10x 9x 1x 8x 8x 8x 9x 9x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 10x 668x 668x 668x 668x 668x 668x 7x 7x 7x 7x 668x 668x 668x 668x 668x 668x 7x 7x 668x 668x 668x 668x 668x 668x 668x 13x 13x 13x 13x 13x 4x 4x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 40x 6x 6x 40x 13x 13x 13x 13x 19x 14x 14x 19x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 30x 2x 2x 30x 15x 15x 15x 15x 15x 13x 30x 13x 13x 13x 13x 13x 13x 13x 15x 15x 15x 15x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 13x 15x 1x 1x 1x 1x 15x 13x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 15x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 19x 19x 19x 19x 13x 13x 13x 2x 2x 2x 4x 2x 2x 2x 2x 2x 2x 13x 13x 13x 13x 13x 13x 13x 40x 40x 13x 13x 13x 668x | import { ComputedRegistry } from '../reactive/createComputed.js';
import { styleMountManager } from './StyleMountManager.js';
import { EventBinder } from '../events/bindEvents.js';
import { EventExecutor, buildEventNode } from '../events/eventExecutor.js';
import { DynamicEvaluator } from '../security/evaluator.js';
import { LifecycleManager } from './lifecycle.js';
import { ComponentScope } from './ComponentScope.js';
import { stampScope } from '../renderer/bindingScope.js';
import { DeadlockManager } from '../renderer/deadlockManager.js';
import { AvenxError, AvenxErrorCodes, formatMessage } from './AvenxError.js';
import { logger } from './AvenxLogger.js';
import { queueJob, queueFlushCallback, nextTick as schedulerNextTick } from '../reactive/scheduler.js';
import { TemplateInstance } from '../renderer/program/TemplateInstance.js';
import { isProgram } from '../../compiler/render/program.js';
import { AvenxWatcher, activeWatcher } from '../reactive/watcher.js';
import { DisposalScope, runInScope } from '../reactive/scope.js';
import { Resource } from '../reactive/Resource.js';
import { ProxyHandlerFactory, RAW_SYMBOL, toRaw } from '../reactive/proxyHandler.js';
import { processBindDirectives } from '../utils/templateUtils.js';
import { profile } from '../utils/profiler.js';
import { parseValidationRules, validateValue, getFieldName, updateValidationState } from '../validation/validator.js';
import { serializeSafe } from '../tooling/inspect.js';
import { requireStringRenderer, hasStringRenderer } from '../renderer/stringRenderer.js';
import { tracer } from '../trace/tracer.js';
import { TraceNodeType } from '../trace/schema.js';
import { traceDerived } from '../trace/derived.js';
/**
* Method names that collide with a real AvenxComponent instance method.
*
* An action or method with one of these names shadows framework machinery --
* `update` is the render method, `destroy` tears the component down -- so it is
* a genuine mistake and warns (AVX_W26).
* @type {string[]}
*/
export const RESERVED_INSTANCE_METHOD_KEYS = [
'mount',
'unmount',
'update',
'destroy',
'scheduleUpdate',
];
/**
* Lifecycle hook names.
*
* These are the documented, supported way to define a hook: an
* `<action name="onMount">` is looked up by {@link AvenxComponent#triggerLifecycle}
* and run at the right moment. They are meant to be declared, so they do not
* warn -- unlike a collision with a reserved instance method.
* @type {string[]}
*/
export const LIFECYCLE_HOOK_KEYS = [
'onBeforeMount',
'onMount',
'onBeforeUpdate',
'onUpdate',
'onUnmount',
'onActivate',
'onDeactivate',
'onErrorCaptured',
];
/**
* Every name the runtime treats specially: reserved instance methods and
* lifecycle hooks. Retained for callers that need the full set; the collision
* warning uses {@link RESERVED_INSTANCE_METHOD_KEYS} alone.
* @type {string[]}
*/
export const RESERVED_INSTANCE_KEYS = [...RESERVED_INSTANCE_METHOD_KEYS, ...LIFECYCLE_HOOK_KEYS];
const globalMixins = [];
let componentUid = 0;
/**
* Base class for all Avenx components.
* Manages state, reactivity, rendering, and lifecycle.
*/
export class AvenxComponent {
/** @type {Element|null} */
#element = null;
/** @type {string} */
#template = '';
/** @type {object} */
#methods = {};
/** @type {object} */
#bridges = {};
/**
* Values the component's module imported, keyed by their local name.
*
* Template expressions and action bodies are evaluated against a declared
* scope rather than by the JavaScript engine, so a module-level `import` is
* not visible to them by default. Before the bundler that was moot -- the
* compiler deleted every non-runtime import, so there was nothing to see.
* Now that an import resolves and ships, it has to be reachable from the code
* that asked for it, or the import is decoration.
*
* They sit at the bottom of the scope, below bridges, so nothing imported can
* shadow a `<state>` key, a computed value, an action or a bridge.
* @type {object}
*/
#imports = {};
/**
* Whether {@link AvenxComponent##imports} holds anything.
*
* Kept as a flag so building a scope costs no property enumeration, and so a
* component that imports nothing gets exactly the layers it had before.
* @type {boolean}
*/
#hasImports = false;
/** @type {ComputedRegistry} */
#computed;
/** @type {TemplateRenderer|null} */
#rendererInstance = null;
/** @type {DomPatcher|null} */
#patcherInstance = null;
/** @type {ListManager|null} */
#listManagerInstance = null;
/** @type {DeferManager|null} */
#deferManagerInstance = null;
/** @type {DeadlockManager|null} */
#deadlockManagerInstance = null;
/** @type {EventBinder} */
#eventBinder;
/** @type {EventExecutor} */
#eventExecutor;
/** @type {DynamicEvaluator} */
#evaluator;
/** @type {LifecycleManager} */
#lifecycle;
/** @type {boolean} */
#isMounted = false;
/** @type {boolean} */
#isUpdating = false;
/** @type {Set<string>} */
#evaluating = new Set();
/**
* Whether a render has completed, and therefore whether the render watcher's
* dependency set can be trusted to say what this component observes.
* @type {boolean}
*/
#hasRenderedOnce = false;
/** @type {object | null} */
#transcludedGroups = null;
/** @type {boolean} */
#updateQueued = false;
/**
* The names this component's state layer binds, cached.
*
* Invalidated by the state proxy whenever a root key is added or removed.
* Null means "not computed yet".
* @type {string[]|null}
*/
#scope = new ComponentScope(this);
/**
* The compiled render program, when the compiler produced one.
*
* Its presence is what selects the fine-grained renderer. A component whose
* template contains something the program runtime does not implement has no
* program and renders through the string path, unchanged.
* @type {object|null}
*/
#program = null;
/**
* This component's mounted copy of the program.
* @type {TemplateInstance|null}
*/
#templateInstance = null;
/**
* Set once the post-render notification is queued for this flush, so a
* component with 500 bindings fires `onUpdate` once rather than 500 times.
* @type {boolean}
*/
#postRenderQueued = false;
/**
* Set once `onBeforeUpdate` has fired for the flush in progress. Cleared when
* that flush's post-render notification runs.
* @type {boolean}
*/
#beforeRenderFired = false;
/** @type {Function} */
#updateJob = () => {
this.#updateQueued = false;
this.update();
};
/** @type {boolean} */
#isUnmounting = false;
/** @type {Promise<void>|null} */
#unmountPromise = null;
/** @type {boolean} */
#isUnmounted = false;
/** @type {Record<string, Element>} */
#refsCache = {};
/** @type {boolean} */
#refsDirty = false;
/** @type {boolean} */
#isBeforeMounting = false;
/** @type {Object<string, object>} */
#resources = {};
/** @type {Error|null} */
#componentError = null;
/** @type {Set<string>} */
#contracts = new Set();
/**
* @param {object} [initialState] - The initial state of the component.
* @param {object} [computed] - Computed properties definitions.
* @param {object} [bridges] - External bridges accessible to the component.
* @param {string} [template] - The HTML template string.
* @param {object} [methods] - Component methods.
* @param {object} [props] - Component properties.
* @param {object} [styles] - Component CSS variables.
* @param {object} [resources] - Reactive resources.
* @param {object} [options] - Component options and compiler contracts.
*/
constructor(initialState = {}, computed = {}, bridges = {}, template = '', methods = {}, props = {}, styles = {}, resources = {}, options = {}) {
this.uid = componentUid++;
this.#updateJob.id = this.uid;
if (options && options.contracts) {
this.#contracts = new Set(options.contracts);
} else if (Array.isArray(options)) {
this.#contracts = new Set(options);
} else if (options instanceof Set) {
this.#contracts = options;
}
// Actions the compiler saw declared `atomic`. Absent for every component
// that declares none, which is why the generated constructor omits the
// options argument entirely in that case.
const optionsObject = options && !Array.isArray(options) && !(options instanceof Set) ? options : null;
if (optionsObject && optionsObject.imports && typeof optionsObject.imports === 'object') {
this.#imports = optionsObject.imports;
this.#hasImports = true;
}
const atomicActions = options && !Array.isArray(options) && !(options instanceof Set) ? options.atomic : null;
// The render program travels in the same options object. Validating the
// shape rather than trusting it keeps a program produced by a different
// build -- restored from a cache, replayed from a trace fixture -- from
// reaching a renderer that would misread it; an unrecognised program means
// the string path, which is slower and always correct.
const compiledProgram =
options && !Array.isArray(options) && !(options instanceof Set) ? options.program : null;
if (isProgram(compiledProgram)) {
this.#program = compiledProgram;
}
/** @type {AvenxComponent|null} */
this.$parent = null;
// Merge global mixins options
const mergedState = {};
const mergedComputed = {};
const mergedMethods = {};
const mergedProps = {};
const mergedStyles = {};
for (const mixin of globalMixins) {
const mixinState = typeof mixin.state === 'function' ? mixin.state.call(this) : mixin.state;
if (mixinState && typeof mixinState === 'object') {
Object.assign(mergedState, mixinState);
}
const mixinData = typeof mixin.data === 'function' ? mixin.data.call(this) : mixin.data;
if (mixinData && typeof mixinData === 'object') {
Object.assign(mergedState, mixinData);
}
if (mixin.computed && typeof mixin.computed === 'object') {
Object.assign(mergedComputed, mixin.computed);
}
if (mixin.methods && typeof mixin.methods === 'object') {
Object.assign(mergedMethods, mixin.methods);
}
if (mixin.props && typeof mixin.props === 'object') {
Object.assign(mergedProps, mixin.props);
}
if (mixin.styles && typeof mixin.styles === 'object') {
Object.assign(mergedStyles, mixin.styles);
}
}
Object.assign(mergedState, initialState);
Object.assign(mergedComputed, computed);
Object.assign(mergedMethods, methods);
Object.assign(mergedProps, props);
Object.assign(mergedStyles, styles);
this._mixinProps = {};
const reservedKeys = ['state', 'data', 'methods', 'computed', 'props', 'styles', 'onBeforeMount', 'onMount', 'onBeforeUpdate', 'onUpdate', 'onUnmount', 'onActivate', 'onDeactivate', 'onErrorCaptured'];
for (const mixin of globalMixins) {
for (const key of Object.keys(mixin)) {
if (!reservedKeys.includes(key)) {
let value = mixin[key];
if (typeof value === 'function') {
value = value.bind(this);
}
if (!(key in this)) {
this[key] = value;
}
this._mixinProps[key] = value;
}
}
}
const isIsolated = this.#contracts.has('isolated');
this.#template = processBindDirectives(template);
this.#bridges = isIsolated ? {} : bridges;
this.#computed = new ComputedRegistry(mergedComputed);
this.#eventBinder = new EventBinder();
// The compiler attaches the closures it generated for this class. Read
// from the constructor rather than passed positionally, because a class
// compiled before expression generation existed simply has neither static
// and gets an evaluator with no table -- which behaves exactly as it did.
this.#evaluator = new DynamicEvaluator({
expressions: this.constructor.__axExprs,
statements: this.constructor.__axStmts,
indexedExpressions: this.constructor.__axProgramExprs,
indexedStatements: this.constructor.__axProgramStmts,
});
this.#lifecycle = new LifecycleManager();
/** @type {AvenxWatcher[]} */
this._watchers = [];
/**
* Owns teardown callbacks created while this component runs its own code
* (lifecycle hooks, actions, event handlers). Bridge subscriptions register
* here and are released in __performTeardown().
* @type {DisposalScope}
*/
this._scope = new DisposalScope(this.constructor.name);
this._stateHandler = new ProxyHandlerFactory({
computedKeys: this.#computed.keys(),
onChange: () => this.scheduleUpdate(),
// The scope's state layer needs the set of names state binds. Computing
// it is `Object.keys()` over the whole state object, and a scope is built
// per expression evaluated -- so on a component with many state keys it
// was the largest single cost in an update, and it grew with the number
// of keys rather than with the change. Cached, and invalidated here,
// which is the only place the answer can change.
onKeysChanged: () => {
this.#scope.invalidateKeys();
},
// A component's onChange means "schedule a render", so it must not fire
// for a write nothing reads. Without this the per-key dependency graph is
// computed and then discarded: changing a state key no expression
// mentions re-rendered the whole component.
//
// Gated on having rendered at least once. Before the first render no
// expression has been evaluated, so every key would look unobserved and
// nothing would ever schedule.
onlyNotifyObserved: () => this.#hasRenderedOnce,
instance: this,
getComputedValue: (key) => {
if (this.#evaluating.has(key)) {
logger.warn(formatMessage(AvenxErrorCodes.COMPUTED_CIRCULAR_DEPENDENCY, key), this.$logContext);
return undefined;
}
this.#evaluating.add(key);
const definition = this.#computed.get(key);
try {
const value =
typeof definition === 'function'
? definition.call(this)
: this.#evaluator.evaluateExpression(definition, this.#createScope(), this.state);
if (tracer.on) {
// Reached only when the computed's watcher is dirty, so this is
// already a re-evaluation rather than a cached read. The watcher
// still holds the value it cached before going dirty, which is the
// honest "from" side of the change — and is what makes the first
// change after a recording starts reportable rather than silently
// absorbed as a baseline.
const watcher = this._stateHandler.computedWatchers.get(key);
traceDerived(
this,
{
name: key,
kind: 'computed',
owner: this.constructor.name,
expression: typeof definition === 'string' ? definition : undefined,
contracts: this.#contracts.size > 0 ? Array.from(this.#contracts) : undefined,
},
value,
watcher && watcher.value !== undefined ? { has: true, value: watcher.value } : undefined,
);
}
return value;
} catch (error) {
if (error && error.code === AvenxErrorCodes.STATE_MUTATION_IN_UPDATE) {
throw error;
}
logger.warn(formatMessage(AvenxErrorCodes.COMPUTED_EVALUTION_FAILED, key, definition, error), this.$logContext);
return undefined;
} finally {
this.#evaluating.delete(key);
}
},
});
this.state = new Proxy(mergedState, this._stateHandler.create());
this._propsHandler = new ProxyHandlerFactory({
onChange: () => this.scheduleUpdate(),
});
this.props = new Proxy(mergedProps, this._propsHandler.create());
this._stylesHandler = new ProxyHandlerFactory({
onChange: () => this.scheduleUpdate(),
});
this.styles = new Proxy(mergedStyles, this._stylesHandler.create());
this.#methods = this.#evaluator.createMethodMap(
mergedMethods,
(executableMethods) => this.#createScope(executableMethods),
() => this.state,
{
owner: this.constructor.name,
kind: 'action',
contracts: Array.from(this.#contracts),
compiled: this.constructor.__axActions,
...(atomicActions ? { atomic: atomicActions } : {}),
},
);
for (const [name, fn] of Object.entries(this.#methods)) {
if (RESERVED_INSTANCE_METHOD_KEYS.includes(name)) {
logger.warn(
formatMessage(
AvenxErrorCodes.COMPONENT_METHOD_RESERVED_KEY_COLLISION,
name,
this.constructor && this.constructor.name !== 'AvenxComponent' && this.constructor.name !== 'Object'
? this.constructor.name
: 'Component'
),
this.$logContext
);
}
if (!(name in this)) {
this[name] = fn;
}
}
const activeResources = typeof resources === 'object' && resources !== null ? resources : {};
// Ensure $resources object is initialized and available on the instance
this.$resources = this.$resources || {};
for (const [name, resDef] of Object.entries(activeResources)) {
const handler = typeof resDef === 'object' && resDef !== null ? resDef.handler : resDef;
const pollInterval = typeof resDef === 'object' && resDef !== null ? resDef.pollInterval : 0;
let handlerFn = typeof handler === 'function' ? handler : null;
if (!handlerFn) {
const cleanHandler = typeof handler === 'string' && handler.trim().startsWith('return') ? handler : `return ${handler}`;
handlerFn = this.#evaluator.createMethodMap(
{ [name]: cleanHandler },
() => ({
...this.#createScope(),
setTimeout: typeof setTimeout !== 'undefined' ? setTimeout : undefined,
clearTimeout: typeof clearTimeout !== 'undefined' ? clearTimeout : undefined,
setInterval: typeof setInterval !== 'undefined' ? setInterval : undefined,
clearInterval: typeof clearInterval !== 'undefined' ? clearInterval : undefined,
fetch: typeof fetch !== 'undefined' ? fetch : undefined,
Promise: typeof Promise !== 'undefined' ? Promise : undefined,
}),
() => this.state,
{
owner: this.constructor.name,
kind: 'resource',
contracts: Array.from(this.#contracts),
compiled: this.constructor.__axResources,
},
)[name];
}
const resInstance = new Resource(name, handlerFn, this, { pollInterval });
this.#resources[name] = resInstance;
this.$resources[name] = resInstance; // Expose imperative controls and status accessors
Object.defineProperty(this, name, {
get: () => this.#resources[name].read(),
enumerable: true,
configurable: true
});
}
// Process declarative watch options from mixins and initialState options
const mergedWatch = {};
for (const mixin of globalMixins) {
if (mixin.watch && typeof mixin.watch === 'object') {
Object.assign(mergedWatch, mixin.watch);
}
}
const optionWatch =
(initialState && typeof initialState === 'object' && initialState.watch && typeof initialState.watch === 'object'
? initialState.watch
: null) ||
(options && typeof options === 'object' && options.watch && typeof options.watch === 'object'
? options.watch
: null);
if (optionWatch) {
Object.assign(mergedWatch, optionWatch);
}
for (const [key, handler] of Object.entries(mergedWatch)) {
if (typeof handler === 'function') {
this.$watch(key, handler);
} else if (typeof handler === 'object' && handler !== null && typeof handler.handler === 'function') {
const { handler: fn, ...watchOpts } = handler;
this.$watch(key, fn, watchOpts);
} else if (typeof handler === 'string' && typeof this[handler] === 'function') {
this.$watch(key, this[handler]);
}
}
/**
* @type {boolean}
* @private
*/
this._isFirstRender = true;
this.#eventExecutor = new EventExecutor((source, event, slotScope) => this.#runEventHandler(source, event, slotScope));
this.#eventExecutor.validate = (el) => this.$validateElement(el);
if (typeof process !== 'undefined' && process.env && process.env.NODE_ENV !== 'production') {
let initialized = false;
const originalProto = Object.getPrototypeOf(this);
const protoProxy = new Proxy(originalProto, {
getPrototypeOf(target) {
return target;
},
set(target, key, value, receiver) {
if (initialized && typeof key === 'string' && !key.startsWith('$') && !key.startsWith('_') && key !== 'renderWatcher') {
const hasKey = (key in receiver);
if (!hasKey) {
const compName = receiver.constructor?.name || 'Component';
console.warn(
`[Avenx Warning] Direct assignment to "this.${key} = ${value}" on component <${compName}> is non-reactive and will not trigger DOM updates. Declare "${key}" in <state> instead.`
);
}
}
return Reflect.set(target, key, value, receiver);
}
});
Object.setPrototypeOf(this, protoProxy);
Promise.resolve().then(() => {
initialized = true;
});
}
}
/**
* Evaluates validation rules for an element and updates this.state.$validation.
* @param {Element} el - The element to validate.
* @returns {string[]} Validation errors for the field.
*/
$validateElement(el) {
if (!el || typeof el.getAttribute !== 'function' || !el.hasAttribute('data-ax-validate')) {
return [];
}
const ruleStr = el.getAttribute('data-ax-validate');
const rules = parseValidationRules(ruleStr);
const fieldName = getFieldName(el);
let value = el.value;
if (el.type === 'checkbox') {
value = el.checked;
}
let customMessages = {};
if (el.hasAttribute('data-ax-validate-messages')) {
try {
customMessages = JSON.parse(el.getAttribute('data-ax-validate-messages'));
} catch {
// Ignored
}
}
const errors = validateValue(value, rules, { state: this.state, customMessages });
updateValidationState(this.state, fieldName, errors);
return errors;
}
/**
* Programmatically registers a watcher on a reactive expression/function.
* @param {Function} getter - Evaluation function returning the value to watch.
* @param {Function} callback - Triggered when the value changes.
* @param {object} [options] - Config options.
* @returns {AvenxWatcher}
*/
watch(getter, callback, options = {}) {
const watcher = new AvenxWatcher(getter, callback, options);
if (this.#isUnmounted) {
watcher.teardown();
return watcher;
}
this._watchers.push(watcher);
return watcher;
}
/**
* Trips a named deadlock boundary inside this component's DOM tree, rendering its fallback template.
* @param {string|null} [boundaryName] - Name of the deadlock boundary (or null for first boundary).
* @param {Error|object} [error] - Error context to pass to fallback template.
*/
$tripDeadlockBoundary(boundaryName = null, error = {}) {
if (!this.#element) return;
const boundaries = this.#deadlockManager.findBoundaries(this.#element);
for (const b of boundaries) {
const name = b.getAttribute('data-ax-deadlock-name');
if (!boundaryName || name === boundaryName) {
this.#deadlockManager.trip(b, error, this.#createScope());
return;
}
}
}
/**
* Resets a named deadlock boundary inside this component's DOM tree.
* @param {string|null} [boundaryName]
*/
$resetDeadlockBoundary(boundaryName = null) {
if (!this.#element) return;
const boundaries = this.#deadlockManager.findBoundaries(this.#element);
for (const b of boundaries) {
const name = b.getAttribute('data-ax-deadlock-name');
if (!boundaryName || name === boundaryName) {
this.#deadlockManager.reset(b);
return;
}
}
}
/**
* Returns component context metadata for diagnostic logging.
* @returns {{ componentName: string, fileName: string|null, component: AvenxComponent }}
*/
get $logContext() {
return {
componentName: this.constructor && this.constructor.name !== 'AvenxComponent' && this.constructor.name !== 'Object' ? this.constructor.name : (this.name || 'Component'),
fileName: this.__filename || (this.options && this.options.__filename) || null,
component: this,
};
}
/**
* Whether the component is currently mounted in the DOM.
* @returns {boolean}
*/
get $isMounted() {
return this.#isMounted;
}
/**
* Whether the component has been unmounted.
* @returns {boolean}
*/
get $isUnmounted() {
return this.#isUnmounted;
}
/**
* Getter for the component's root element.
* @returns {Element|null}
*/
get $element() {
return this.#element;
}
/**
* Getter for component reference elements marked with data-ax-ref.
* Lazily resolves references if marked dirty.
* @returns {Record<string, Element>}
*/
get $refs() {
if (this.#refsDirty) {
this.#collectRefs();
}
return this.#refsCache;
}
/**
* Slot helpers for checking whether the parent provided content for a slot.
* Available after mount target setup populates `#transcludedGroups`.
* @returns {object}
*/
get $slots() {
const groups = this.#transcludedGroups;
return {
/**
* @param {string} [slotName] Named slot, or `default` / empty for the default slot.
* @returns {boolean}
*/
has(slotName = 'default') {
if (!groups) return false;
const name = !slotName || slotName === 'default' ? null : slotName;
if (!name) {
return Array.isArray(groups.default) && groups.default.length > 0;
}
const nodes = groups.named?.[name];
return Array.isArray(nodes) && nodes.length > 0;
},
};
}
/**
* Returns a diagnostic snapshot of the component for runtime debugging.
* Props and state are sanitized clones (safe to log, serialize, or diff);
* `element` is intentionally the live root element so it stays inspectable
* in browser devtools. Computed properties are listed by key only, so
* inspecting never evaluates them.
* @returns {{ componentName: string, props: object, state: object, computed: string[], slots: string[], element: Element|null }}
*/
$inspect() {
const groups = this.#transcludedGroups;
const slots = [
...(Array.isArray(groups?.default) && groups.default.length > 0 ? ['default'] : []),
...Object.keys(groups?.named || {}),
];
// Serialize the raw targets: enumerating the reactive proxies would
// evaluate computed properties as a side effect.
return {
componentName: this.$logContext.componentName,
props: serializeSafe(toRaw(this.props)),
state: serializeSafe(toRaw(this.state)),
computed: this.#computed.keys(),
slots,
element: this.$element,
};
}
/**
* KeepAlive invalidation API for clearing cached components.
* @returns {object}
*/
get $keepAlive() {
return {
clear: (componentName) => {
if (this.$app && typeof this.$app.clearKeepAliveCache === 'function') {
return this.$app.clearKeepAliveCache(componentName);
}
return false;
},
};
}
/**
* Helper method to clear cached KeepAlive component instances.
* @param {string} [pageName] - Optional component or page name to clear from cache.
* @returns {boolean} True if cache entries were evicted, false otherwise.
*/
clearKeepAliveCache(pageName) {
if (this.$app && typeof this.$app.clearKeepAliveCache === 'function') {
return this.$app.clearKeepAliveCache(pageName);
}
return false;
}
/**
* Emits a custom event up to parent components with unified bubble options.
* @param {string} eventName - Name of the event to emit.
* @param {object} [detail] - Event details payload.
* @param {object} [options] - Optional custom event options.
*/
emit(eventName, detail = {}, options = {}) {
if (typeof CustomEvent === 'undefined') {
return;
}
const event = new CustomEvent(eventName, {
detail,
bubbles: options.bubbles !== undefined ? options.bubbles : true,
cancelable: options.cancelable !== undefined ? options.cancelable : true,
...options
});
if (this.$element) {
this.$element.dispatchEvent(event);
}
}
/**
* Emits a custom event to the parent component.
* @param {string} eventName - Name of the event to emit.
* @param {object} [detail] - Event details.
*/
$emit(eventName, detail = {}) {
this.emit(eventName, detail, { composed: true });
}
/**
* Reactively listens to changes in specific state values or getters.
* @param {string|Function|Array<string|Function>} source - State property key string, getter function, or array of sources.
* @param {Function} callback - Triggered when the value changes.
* @param {object} [options] - Config options.
* @param {boolean} [options.immediate] - Run callback immediately on watcher creation.
* @param {boolean} [options.deep] - Deeply watch nested properties.
* @returns {AvenxWatcher}
*/
$watch(source, callback, options = {}) {
const resolveSource = (src) => {
if (typeof src === 'string') {
return () => {
const segments = src.split('.');
let val = this.state;
for (const seg of segments) {
if (val === null || val === undefined) return undefined;
val = val[seg];
}
return val;
};
} else if (typeof src === 'function') {
return () => src.call(this);
} else {
throw new Error('source element must be a string or a function');
}
};
let getter;
if (Array.isArray(source)) {
getter = source.map((src) => resolveSource(src));
} else if (typeof source === 'string' || typeof source === 'function') {
getter = resolveSource(source);
} else {
throw new Error('source must be a string, function, or array of sources');
}
const watcher = new AvenxWatcher(getter, callback, options);
if (this.#isUnmounted) {
watcher.teardown();
return watcher;
}
this._watchers.push(watcher);
return watcher;
}
/**
* Reactively runs an immediate effect hook that automatically tracks dependencies and re-runs on state mutation.
* Automatically registers the watcher in this._watchers and tears it down when the component unmounts.
* @param {Function} effect - Effect function to run immediately and track.
* @param {object} [options] - Config options.
* @returns {Function} Stop handle function () => watcher.teardown().
*/
$watchEffect(effect, options = {}) {
if (typeof effect !== 'function') {
throw new Error('effect must be a function');
}
const getter = () => effect.call(this);
const watcher = new AvenxWatcher(getter, null, options);
if (this.#isUnmounted) {
watcher.teardown();
const stop = () => watcher.teardown();
stop.watcher = watcher;
return stop;
}
this._watchers.push(watcher);
const stop = () => {
watcher.teardown();
const idx = this._watchers.indexOf(watcher);
if (idx !== -1) {
this._watchers.splice(idx, 1);
}
};
stop.watcher = watcher;
return stop;
}
/**
* Creates a scope object for expression evaluation.
* @param {object} [methods] - Methods to include in the scope.
* @param {object} [extras] - Additional variables to include.
* @returns {object} The combined scope.
* @private
*/
#createScope(methods = this.#methods, extras = null) {
return this.#scope.resolve(methods, extras && Object.keys(extras).length > 0 ? extras : null);
}
/**
* The names the component's computed values bind.
*
* Read by {@link ComponentScope}; a component's computed registry is private
* and the scope has no business reaching into it.
* @returns {string[]} Computed names.
*/
__computedKeys() {
return this.#computed.keys();
}
/**
* The component's executable actions.
* @returns {object} The action map.
*/
__methods() {
return this.#methods;
}
/**
* Whether the component declared the `isolated` contract.
* @returns {boolean} True when bridges are kept out of scope.
*/
__isIsolated() {
return this.#contracts.has('isolated');
}
/**
* The bridges this component can see.
* @returns {object} Bridges by name.
*/
__bridgeValues() {
return this.#bridges;
}
/**
* Whether the component's module bound any imports.
* @returns {boolean} True when there are imports in scope.
*/
__hasImports() {
return this.#hasImports;
}
/**
* The values the component's module imported.
* @returns {object} Imported values by local name.
*/
__importValues() {
return this.#imports;
}
/**
* The names of the component's declared resources.
* @returns {string[]} Resource names.
*/
__resourceNames() {
return this.#resources ? Object.keys(this.#resources) : [];
}
/**
* Reads a resource, suspending if it is still in flight.
* @param {string} name - The resource name.
* @returns {any} The resource's value.
*/
__readResource(name) {
return this.#resources[name].read();
}
/**
* Resolves an expression within the template.
* @param {string} expression - The expression to evaluate.
* @param {object} [extraScope] - Additional scope variables.
* @returns {any} The result of the evaluation.
* @private
*/
#resolveTemplateExpression(expression, extraScope = {}) {
return this.#evaluator.evaluateExpression(expression, this.#createScope(this.#methods, extraScope), this.state);
}
/**
* Evaluates one of the program's expressions by index.
*
* The scope is built the same way every other template expression's is, so a
* compiled binding sees the same names, the same bridges and the same tracer
* substitution point. Only the addressing changed.
* @param {number} index - The expression index the op carries.
* @param {object|null} [locals] - A block's local bindings, such as a loop item.
* @returns {any} The value.
* @private
*/
#evaluateProgram(index, locals = null) {
const scope = this.#createScope(this.#methods, locals || undefined);
// MIGRATION: a program emitted by the pre-IR compiler carries expression
// *source* on its ops rather than an index. Both shapes are executed here
// while the two compiler paths coexist. Remove this branch with the legacy
// renderer -- see lib/compiler/render/compileTemplate.js.
if (typeof index === 'string') {
return this.#evaluator.evaluateExpression(index, scope, this.state);
}
return this.#evaluator.evaluateIndexed(index, scope, this.state);
}
/**
* Runs one of the program's event handlers by index.
* @param {number} index - The statement index the op carries.
* @param {Event} event - The DOM event.
* @param {object|null} [locals] - A block's local bindings.
* @returns {any} Whatever the handler returned.
* @private
*/
#runProgramStatement(index, event, locals = null) {
// A DOM event is the one thing in an Avenx application that genuinely
// starts a causal chain, so it opens the outermost trace node -- the same
// node EventExecutor opens for the string path, built by the same
// function, so a trace does not read differently depending on which
// renderer produced it.
//
// Everything replay needs (the event type, the target selector, a typed
// value, a checked flag, a key) comes from the event. Only the `handler`
// label comes from the source, which a development build supplies through
// __axProgramStmtSrc and a production build does not carry.
const label = this.constructor.__axProgramStmtSrc?.[index] ?? `handler #${index}`;
try {
const token = tracer.on ? tracer.enter(TraceNodeType.EVENT, buildEventNode(label, event)) : -1;
try {
// Subscriptions opened by a handler belong to this component, so the
// handler runs inside the component's disposal scope -- the same rule
// the string path's handler follows.
return runInScope(this._scope, () =>
this.#evaluator.executeIndexed(
index,
this.#createScope(this.#methods, { event, ...(locals || {}) }),
this.state,
),
);
} finally {
if (token >= 0) {
tracer.leave(token);
}
}
} catch (error) {
logger.error(formatMessage(AvenxErrorCodes.EVENT_HANDLER_ERROR, label, error), this.$logContext);
this.#reportError(error, label, true);
return undefined;
}
}
/**
* Runs an event handler.
*
* The handler arrives as source. It used to be able to arrive as a function
* too -- `EventExecutor` pre-compiled every handler with `new Function` --
* and that branch ran the closure against `AvenxSandbox.createProxy`, the
* source-text sandbox the AST evaluator replaced. Removing the branch closes
* the last route from a template to that sandbox: every inline handler now
* goes through `executeStatement`, which parses first and only reaches for
* `new Function` when the body is genuinely a statement.
* @param {string} source - The handler body, as written in the template.
* @param {Event} event - The event object.
* @param {object|null} [slotScope] - Optional slot scope variables.
* @returns {any} The result of the execution.
* @private
*/
#runEventHandler(source, event, slotScope = null) {
try {
// Subscriptions opened by a handler belong to this component, so the
// handler runs inside the component's disposal scope.
return runInScope(this._scope, () =>
this.#evaluator.executeStatement(
source,
this.#createScope(this.#methods, { event, ...slotScope }),
this.state,
),
);
} catch (error) {
logger.error(formatMessage(AvenxErrorCodes.EVENT_HANDLER_ERROR, source, error), this.$logContext);
this.#reportError(error, source, true);
return undefined;
}
}
/**
* The compiled template this component renders.
*
* An internal seam, in the same family as `__setMountTarget`. Benchmarks and
* renderer tests need the exact string the compiler produced, and reaching it
* by recompiling the source would measure a reconstruction rather than what
* the component actually holds.
* @returns {string} The template source.
*/
__getTemplate() {
return this.#template;
}
/**
* Evaluates one template expression against this component's scope.
*
* Exposed for renderer benchmarks and tests, which need to price expression
* evaluation on its own rather than inferring it from a whole update.
* @param {string} expression - The expression source.
* @param {object} [extraScope] - Additional scope bindings.
* @returns {any} The value.
*/
__evaluate(expression, extraScope = {}) {
return this.#resolveTemplateExpression(expression, extraScope);
}
/**
* Builds one evaluation scope, without evaluating anything in it.
*
* Scope construction used to happen once per interpolation per render, which
* made it a hot path nobody could see. It is measurable from here.
* @returns {object} A fresh scope.
*/
__buildScope() {
return this.#createScope();
}
/**
* Renders the component template with current state.
* @returns {string} The rendered HTML string.
*/
render() {
const enableProfiling = !!(this.$app?.enableProfiling || (typeof window !== 'undefined' && window.__avenx_enable_profiling));
return profile(enableProfiling, this.constructor.name, 'render', () => {
return this.#renderer.render(this.#template, (expression) => this.#resolveTemplateExpression(expression));
});
}
/**
* The string renderer and its satellites, built on first use.
*
* A component with a render program never touches any of them, and in a
* compiled application most components have one. Constructing five objects
* per instance -- one of which allocates a 500-entry LRU cache -- to serve a
* path that will not run is the kind of cost that is invisible per component
* and material per page.
*
* Exposed as getters under the original names, so every call site reads the
* same as it did and only the moment of construction moved.
* @returns {TemplateRenderer} The template renderer.
*/
get #renderer() {
if (!this.#rendererInstance) {
this.#rendererInstance = new (requireStringRenderer(this.constructor.name).TemplateRenderer)();
}
return this.#rendererInstance;
}
/**
* @returns {DomPatcher} The DOM patcher.
*/
get #patcher() {
if (!this.#patcherInstance) {
this.#patcherInstance = new (requireStringRenderer(this.constructor.name).DomPatcher)();
}
return this.#patcherInstance;
}
/**
* @returns {ListManager} The list manager.
*/
get #listManager() {
if (!this.#listManagerInstance) {
this.#listManagerInstance = new (requireStringRenderer(this.constructor.name).ListManager)(
this.#evaluator,
this.#renderer,
this.#eventBinder,
this.constructor.name,
);
}
return this.#listManagerInstance;
}
/**
* @returns {DeferManager} The defer manager.
*/
get #deferManager() {
if (!this.#deferManagerInstance) {
this.#deferManagerInstance = new (requireStringRenderer(this.constructor.name).DeferManager)(
this.#evaluator,
this.#renderer,
this.#eventBinder,
this.constructor.name,
);
}
return this.#deferManagerInstance;
}
/**
* @returns {DeadlockManager} The deadlock manager.
*/
get #deadlockManager() {
if (!this.#deadlockManagerInstance) {
this.#deadlockManagerInstance = new DeadlockManager(
this.#evaluator,
this.#renderer,
this.#eventBinder,
this.constructor.name,
);
}
return this.#deadlockManagerInstance;
}
/**
* Renders the component.
*
* On the compiled path this builds the DOM once and hands ownership to the
* per-binding effects; afterwards it is only reached when something outside
* the reactive graph asks for a re-read. On the string path it evaluates the
* render watcher, which re-renders and re-patches the whole template.
*/
update() {
if (this.#program) {
this.#renderProgram();
return;
}
if (!this.renderWatcher) {
this.renderWatcher = new AvenxWatcher(
() => this.runUpdate(),
() => this.scheduleUpdate(),
{ lazy: true, name: `${this.constructor.name}#render` },
);
}
this.renderWatcher.evaluate();
}
/**
* Whether this component renders through a compiled program.
*
* Exposed for tests and diagnostics: "did this component take the fast path"
* is otherwise unanswerable from outside, and a performance property nobody
* can observe is a performance property nobody can defend.
* @returns {boolean} True when a render program is driving the DOM.
*/
get $compiled() {
return this.#program !== null;
}
/**
* Renders through the compiled program.
*
* On the first call this builds the DOM from the program's skeleton and
* creates one reactive effect per binding. After that the effects own the
* DOM: a state write wakes the bindings that read it and nothing else, and
* this method is only reached again when something *outside* the reactive
* graph asks for a re-read -- a settled resource, a forced update.
* @private
*/
#renderProgram() {
if (!this.#element) return;
if (this.#componentError) {
this.#handleComponentError(this.#componentError);
return;
}
this.#isUpdating = true;
try {
if (this.#templateInstance) {
if (this.#isMounted) {
this.#triggerLifecycle('onBeforeUpdate');
}
this.#templateInstance.refresh();
this.#afterProgramRender();
return;
}
const instance = new TemplateInstance(this.#program, {
program: this.#program,
evaluate: (index, locals) => this.#evaluateProgram(index, locals),
runStatement: (index, event, locals) => this.#runProgramStatement(index, event, locals),
describeExpression: (index) => this.constructor.__axProgramExprSrc?.[index],
onSuspend: (promise) => this.#suspend(promise),
jobId: this.uid,
onRendered: () => this.#scheduleProgramPostRender(),
onChildProps: () => this.__onChildPropsChanged(),
onBeforeRender: () => this.#notifyProgramBeforeRender(),
});
if (!instance.usable) {
// The skeleton could not be prepared in this environment -- a DOM
// without <template>, or a parser that reshaped the tree past the
// compiler's markers. Drop to the string renderer permanently rather
// than binding against a tree that does not match the program.
logger.warn(
formatMessage(
AvenxErrorCodes.TEMPLATE_RENDER_ERROR,
this.constructor.name,
'compiled template could not be prepared; falling back to the string renderer',
),
this.$logContext,
);
this.#program = null;
this.#isUpdating = false;
this.update();
return;
}
if (this.#isMounted) {
this.#triggerLifecycle('onBeforeUpdate');
}
// Bindings run while the fragment is still detached, so the document
// never sees the skeleton with its values missing.
const fragment = instance.create();
this.#templateInstance = instance;
this.#element.innerHTML = '';
this.#element.appendChild(fragment);
// A `<select value="a">` written literally in the template is never
// touched by an op, and the HTML parser does not apply a `value`
// attribute to a select. Once, on creation, is enough.
this.#syncSelectElements();
// Slots compile now, so the compiled path has to transclude too. The
// fallback children are already in the tree at this point -- they came
// out of the skeleton -- so they are captured here, before `#fillSlots`
// empties the outlet to insert what the parent passed down. The string
// path recovers them by re-rendering the template and parsing the result;
// a compiled component has the nodes in hand and needs neither.
this.#captureSlotFallbacks();
this.#fillSlots();
// Set once rather than per update. `data-ax-ref` makes a template refuse
// to compile, so a compiled component has no refs to find -- but `$refs`
// collects lazily and this keeps the flag honest for anything that reads
// it, at the cost of one scan the first time somebody does.
this.#refsDirty = true;
// Events are delegated from this element and read `data-ax-event` off the
// DOM when one fires, so binding once at mount covers every handler the
// template declares. The string path re-binds on every update because it
// replaces nodes; a program never does.
this.#eventBinder.bind(this.#element, this.#eventExecutor);
this.#hasRenderedOnce = true;
this.#afterProgramRender();
} catch (error) {
if (error instanceof Promise) {
this.#suspend(error);
return;
}
if (error && error.code === AvenxErrorCodes.STATE_MUTATION_IN_UPDATE) {
throw error;
}
this.#handleComponentError(error);
} finally {
this.#isUpdating = false;
}
}
/**
* Runs the bookkeeping that follows any render on the program path.
* @private
*/
#afterProgramRender() {
this.#beforeRenderFired = false;
// Deliberately narrower than the string path's equivalent, because the
// compiler has already ruled several things out.
//
// `#validateFormElements` and `#collectRefs` each run a querySelectorAll
// over the whole component subtree. On the string path that is one scan per
// render and the render was already O(template). Here it would be the only
// O(template) work left in an otherwise O(1) update -- and it would find
// nothing, because `data-ax-validate` and `data-ax-ref` both make a
// template refuse to compile. A component reaching this method cannot
// contain either.
//
// `<select value>` is likewise handled at the point of the write:
// `syncValueProperty` sets the property alongside the attribute, so there
// is nothing left to re-sync afterwards. The one case it does not cover --
// a *static* `value` on a select, which no op ever applies -- is synced
// once when the tree is created, not on every update.
if (this.#isMounted && typeof CustomEvent !== 'undefined' && this.#element?.dispatchEvent) {
this.#element.dispatchEvent(new CustomEvent('avenx:update'));
}
if (this.#isMounted) {
this.#triggerLifecycle('onUpdate');
}
this.__notifyInjectingChildren();
}
/**
* Called when a compiled prop for a child component changed value.
*
* A plain component does not mount children, so this is a no-op here.
* {@link AvenxPage} overrides it: pages own the child mount points, and a
* changed prop is the one thing that has to reach an already-mounted child.
*/
__onChildPropsChanged() {}
/**
* Fires `onBeforeUpdate` once, before the first binding of a flush applies.
*
* On the string path there was one render per update, so the hook had an
* obvious place to sit. With per-binding effects there is no single render,
* and a component with 500 bindings must not fire the hook 500 times. The
* flag is cleared by the post-render callback, which runs after every job in
* the flush has drained.
* @private
*/
#notifyProgramBeforeRender() {
if (this.#beforeRenderFired || !this.#isMounted || this.#isUnmounted) return;
this.#beforeRenderFired = true;
this.#triggerLifecycle('onBeforeUpdate');
}
/**
* Queues the once-per-flush notification for a fine-grained update.
*
* Individual bindings write to the DOM independently, so there is no single
* moment that is "the update" any more. `onUpdate`, the `avenx:update` event
* and ref resolution still have to happen exactly once per flush, or a
* component with many bindings would fire them many times per tick and every
* lifecycle test in every application would start failing.
* @private
*/
#scheduleProgramPostRender() {
if (this.#postRenderQueued || this.#isUnmounted) return;
this.#postRenderQueued = true;
queueFlushCallback(() => {
this.#postRenderQueued = false;
if (this.#isUnmounted || !this.#element) {
this.#beforeRenderFired = false;
return;
}
this.#afterProgramRender();
});
}
/**
* Performs the actual update/render of the component.
*/
runUpdate() {
if (!this.#element) return;
if (this.#componentError) {
this.#handleComponentError(this.#componentError);
return;
}
this.#isUpdating = true;
try {
if (this.#isMounted) {
this.#triggerLifecycle('onBeforeUpdate');
}
this.__updateProvidedState();
this.#patcher.patch(this.#element, this.render(), (expression, slotScope) => this.#resolveTemplateExpression(expression, slotScope), this.$app);
// Fill slots with transcluded content.
this.#fillSlots();
this.#listManager.process(this.#element, this.#createScope(), this.state, this.$app);
this.#deferManager.process(this.#element, this.#createScope(), this.state, this.$app);
this.#eventBinder.bind(this.#element, this.#eventExecutor);
this.#refsDirty = true;
this.#syncSelectElements();
if (this.#isMounted && typeof CustomEvent !== 'undefined' && this.#element?.dispatchEvent) {
this.#element.dispatchEvent(new CustomEvent('avenx:update'));
}
if (this.#isMounted) {
this.#resolveRefs();
this.#triggerLifecycle('onUpdate');
}
this.__notifyInjectingChildren();
// Only a render that ran under the render watcher collected
// dependencies. runUpdate() can also be called directly, and after such
// a call the dependency set says nothing about what this component
// observes -- so filtering must stay off until a tracked render happens.
if (activeWatcher && activeWatcher === this.renderWatcher) {
this.#hasRenderedOnce = true;
}
} catch (error) {
if (error instanceof Promise) {
this.#suspend(error);
return;
}
if (error && error.code === AvenxErrorCodes.STATE_MUTATION_IN_UPDATE) {
throw error;
}
this.#handleComponentError(error);
} finally {
this.#isUpdating = false;
this.#validateFormElements();
}
}
/**
* Validates all form input elements in the component that have data-ax-validate.
* @private
*/
#validateFormElements() {
if (!this.$element || typeof this.$element.querySelectorAll !== 'function') return;
const elements = Array.from(this.$element.querySelectorAll('[data-ax-validate]'));
if (this.$element.hasAttribute && this.$element.hasAttribute('data-ax-validate')) {
elements.unshift(this.$element);
}
for (const el of elements) {
this.$validateElement(el);
}
}
/**
* Executes a callback (or resolves a Promise) after the current reactive
* update cycle has finished flushing pending DOM updates.
* @param {Function} [callback] - Optional callback to run after the flush.
* @returns {Promise<void>|void} A promise resolving after the flush, if no callback was given.
*/
$nextTick(callback) {
return schedulerNextTick(callback);
}
/**
* Alias for {@link AvenxComponent#$nextTick}.
* @param {Function} [callback] - Optional callback to run after the flush.
* @returns {Promise<void>|void}
*/
nextTick(callback) {
return this.$nextTick(callback);
}
/**
* Schedules an update to run asynchronously in a microtask.
*/
scheduleUpdate() {
if (this.#isUpdating) {
throw new AvenxError(AvenxErrorCodes.STATE_MUTATION_IN_UPDATE);
}
if (this.renderWatcher) {
this.renderWatcher.dirty = true;
}
if (this.#isBeforeMounting) {
return;
}
// On the program path there is no component-level render to schedule. The
// write that reached here has already woken the bindings that read it,
// through the same dependency graph this call was about to bypass, and
// queueing a whole-component update on top would undo the change: every
// write would re-evaluate every binding, which is what the string renderer
// did. The lifecycle notification is still owed, and is queued instead.
if (this.#templateInstance) {
this.#scheduleProgramPostRender();
return;
}
if (this.#updateQueued) return;
this.#updateQueued = true;
queueJob(this.#updateJob);
}
/**
* Internal method to set the mount target.
* @param {Element} target - The target element.
* @param {boolean} [isRestore] - Whether the component is being restored from keep-alive.
* @private
*/
__setMountTarget(target, isRestore = false) {
this.#element = target;
this.#isUnmounted = false;
// A component instance may be mounted again after teardown. Its disposal
// scope is single-use, so give the new lifetime a fresh one.
if (this._scope && this._scope.disposed) {
this._scope = new DisposalScope(this.constructor.name);
}
if (target) {
target.__avenx_comp_instance = this;
this.__initProvide();
this.__initInjection();
if (isRestore) {
return;
}
const children = Array.from(target.childNodes);
this.#transcludedGroups = {
default: [],
named: {},
};
children.forEach((child) => {
if (child.nodeType === 1 && child.hasAttribute('slot')) {
const name = child.getAttribute('slot');
if (!this.#transcludedGroups.named[name]) {
this.#transcludedGroups.named[name] = [];
}
this.#transcludedGroups.named[name].push(child);
} else {
this.#transcludedGroups.default.push(child);
}
});
target.innerHTML = '';
}
}
/**
* Resolves the current name of a slot element.
* Dynamic slot names are evaluated during template rendering, so the
* rendered name attribute contains the value used for transclusion.
* @param {Element} slotEl - The slot element.
* @returns {string|null} The resolved slot name.
* @private
*/
#resolveSlotName(slotEl) {
const name = slotEl.getAttribute('name');
return name && name.trim() ? name.trim() : null;
}
/**
* Records each slot's declared fallback children before anything fills it.
*
* Called once, from the compiled render path, while the skeleton's own
* children are still in the outlet. After `#fillSlots` has run, the outlet
* holds whatever the parent projected and the fallback is unrecoverable from
* the DOM -- which is why the string path has to re-render the template and
* parse the result to find it again.
* @private
*/
#captureSlotFallbacks() {
if (!this.#element) return;
for (const slotEl of this.#getOwnSlots()) {
if (slotEl.__avenxFallback) continue;
slotEl.__avenxFallback = Array.from(slotEl.childNodes).map((child) => child.cloneNode(true));
}
}
/**
* Retrieves the fallback children declared for a slot.
* @param {string|null} name - The name of the slot.
* @returns {Node[]} Cloned child nodes.
* @private
*/
#getDefaultSlotChildren(name) {
// A compiled component captured its fallbacks from the skeleton at mount,
// so the answer is already a list of nodes. The round trip below exists
// only for the string path, which has no other record of them.
const captured = this.#getOwnSlots().find((slotEl) => {
const slotName = this.#resolveSlotName(slotEl);
return (name ? slotName === name : !slotName) && slotEl.__avenxFallback;
});
if (captured) {
return captured.__avenxFallback.map((child) => child.cloneNode(true));
}
try {
const parser = new DOMParser();
const doc = parser.parseFromString(this.render(), 'text/html');
const rootDoc = doc.body || doc;
const defaultSlot = Array.from(rootDoc.querySelectorAll('slot')).find((s) => {
const sName = this.#resolveSlotName(s);
return name ? sName === name : !sName;
});
if (defaultSlot) {
return Array.from(defaultSlot.childNodes).map((child) => child.cloneNode(true));
}
} catch (e) {
logger.warn(
formatMessage(AvenxErrorCodes.COMPONENT_RESTORE_SLOT_CONTENT_FAILED, e.message || e),
this.$logContext
);
}
return [];
}
/**
* Fills <slot> elements with transcluded child nodes.
* Supports both static and dynamically rendered slot names.
* @private
*/
#fillSlots() {
if (!this.#element || !this.#transcludedGroups) return;
const slots = this.#getOwnSlots();
slots.forEach((slotEl) => {
const name = this.#resolveSlotName(slotEl);
const nodes = name ? this.#transcludedGroups.named[name] || [] : this.#transcludedGroups.default || [];
const hasContent = nodes.some((node) => {
if (node.nodeType === 1 && node.nodeName !== '!--' && node.nodeName !== '#comment') return true;
if (node.nodeType === 3 && node.textContent.trim().length > 0) return true;
return false;
});
if (hasContent) {
slotEl.innerHTML = '';
const templateEl = nodes.find(
(node) => node.nodeType === 1 && node.tagName.toLowerCase() === 'template' && node.hasAttribute('data-slot-props')
);
if (templateEl) {
const renderedNodes = this.#renderScopedSlot(slotEl, templateEl);
renderedNodes.forEach((node) => {
slotEl.appendChild(node);
});
} else {
nodes.forEach((node) => {
slotEl.appendChild(node);
});
}
slotEl.setAttribute('data-avenx-transcluded', 'true');
} else if (slotEl.hasAttribute('data-avenx-transcluded')) {
// Only when the outlet actually held projected content. Rebuilding it
// unconditionally replaced the fallback with *clones* of itself, and on
// the compiled path the bindings still pointed at the originals -- so a
// slot showing its fallback rendered once and then went stale, writing
// every later value into a detached node.
//
// When nothing was ever projected, the fallback in the outlet is the
// one the renderer produced and is already live. Leaving it alone is
// both cheaper and the only correct thing to do.
slotEl.removeAttribute('data-avenx-transcluded');
slotEl.innerHTML = '';
this.#getDefaultSlotChildren(name).forEach((child) => {
slotEl.appendChild(child);
});
}
});
}
/**
* Retrieves slot elements belonging to this component.
* @returns {Element[]}
* @private
*/
#getOwnSlots() {
if (!this.#element) return [];
const slots = this.#element.querySelectorAll('slot');
const root = this.#element;
return Array.from(slots).filter((slot) => {
let parent = slot.parentNode;
while (parent && parent !== root) {
if (
parent.hasAttribute &&
(parent.hasAttribute('data-avenx-comp') || parent.hasAttribute('data-avenx-comp-dynamic'))
) {
return false;
}
parent = parent.parentNode;
}
return true;
});
}
/**
* Resolves reference elements if marked dirty.
* @private
*/
#resolveRefs() {
if (this.#refsDirty) {
this.#collectRefs();
}
}
/**
* Collects elements marked with data-ax-ref that belong to this component.
* Elements inside nested component boundaries are excluded.
* @private
*/
#collectRefs() {
this.#refsCache = {};
this.#refsDirty = false;
if (!this.#element) return;
const refElements = this.#element.querySelectorAll('[data-ax-ref]');
const root = this.#element;
Array.from(refElements).forEach((element) => {
let parent = element.parentNode;
while (parent && parent !== root) {
if (
parent.hasAttribute &&
(parent.hasAttribute('data-avenx-comp') || parent.hasAttribute('data-avenx-comp-dynamic'))
) {
return;
}
parent = parent.parentNode;
}
const refName = element.getAttribute('data-ax-ref');
if (refName && refName.trim()) {
// Prefer the mounted component instance when present (Vue-like $refs behavior)
this.#refsCache[refName.trim()] = element.__avenx_comp_instance || element;
}
});
}
/**
* Renders the content of a scoped slot template using child-exposed properties
* merged into the parent component's evaluation scope.
* @param {Element} slotEl - The slot element.
* @param {Element} templateEl - The transcluded template element.
* @returns {Node[]} Array of rendered and tagged child nodes.
* @private
*/
#renderScopedSlot(slotEl, templateEl) {
const slotPropsName = templateEl.getAttribute('data-slot-props');
if (!slotPropsName) return [];
const exposedProps = {};
for (const attr of slotEl.attributes) {
if (attr.name.startsWith(':')) {
const propName = attr.name.slice(1);
exposedProps[propName] = this._evaluate(attr.value);
} else if (attr.name.startsWith('data-props-')) {
const propName = attr.name.slice('data-props-'.length);
exposedProps[propName] = this._evaluate(attr.value);
}
}
const extraScope = { [slotPropsName]: exposedProps };
let templateHtml = templateEl.innerHTML;
templateHtml = templateHtml
.replace(/_AX_LBRACE3_/g, '{{{')
.replace(/_AX_RBRACE3_/g, '}}}')
.replace(/_AX_LBRACE_/g, '{{')
.replace(/_AX_RBRACE_/g, '}}');
const parentComp = this.$parent || this;
const renderedHtml = this.#renderer.render(templateHtml, (expr) => {
return parentComp._evaluate(expr, extraScope);
});
const parser = new DOMParser();
const doc = parser.parseFromString(renderedHtml, 'text/html');
const nodes = Array.from((doc.body || doc).childNodes);
// Only the roots need stamping: resolution walks up from wherever a binding
// sits, so marking every descendant was redundant work proportional to the
// size of the slot's content.
nodes.forEach((node) => stampScope(node, extraScope));
nodes.forEach((node) => {
if (node.nodeType === 1) {
this.#patcher.applyDirectives(node, (expr) => {
return parentComp._evaluate(expr, extraScope);
}, this.$app);
}
});
return nodes;
}
/**
* Updates the transcluded content when the parent template updates.
* @param {NodeList|Array} virtualChildNodes - The new virtual transcluded nodes from parent.
* @private
*/
__updateTranscludedContent(virtualChildNodes) {
const grouped = {
default: [],
named: {},
};
Array.from(virtualChildNodes || []).forEach((node) => {
if (node.nodeType === 1 && node.hasAttribute('slot')) {
const name = node.getAttribute('slot');
if (!grouped.named[name]) {
grouped.named[name] = [];
}
grouped.named[name].push(node);
} else {
grouped.default.push(node);
}
});
this.#transcludedGroups = grouped;
if (this.#element) {
const slots = this.#getOwnSlots();
slots.forEach((slotEl) => {
const name = this.#resolveSlotName(slotEl);
const newChildren = name ? grouped.named[name] || [] : grouped.default || [];
const newSlotWrapper = slotEl.cloneNode(false);
const templateEl = newChildren.find(
(node) => node.nodeType === 1 && node.tagName.toLowerCase() === 'template' && node.hasAttribute('data-slot-props')
);
let finalChildren = newChildren;
let isScoped = false;
if (templateEl) {
finalChildren = this.#renderScopedSlot(slotEl, templateEl);
isScoped = true;
}
if (isScoped) {
finalChildren.forEach((child) => {
newSlotWrapper.appendChild(child);
});
} else {
finalChildren.forEach((child) => {
newSlotWrapper.appendChild(child.cloneNode(true));
});
}
const hasContent = finalChildren.some((node) => {
if (node.nodeType === 1 && node.nodeName !== '!--' && node.nodeName !== '#comment') return true;
if (node.nodeType === 3 && node.textContent.trim().length > 0) return true;
return false;
});
if (hasContent) {
newSlotWrapper.setAttribute('data-avenx-transcluded', 'true');
} else {
newSlotWrapper.removeAttribute('data-avenx-transcluded');
this.#getDefaultSlotChildren(name).forEach((child) => {
newSlotWrapper.appendChild(child);
});
}
const slotEvaluator = (expr) => {
if (isScoped && templateEl) {
const slotPropsName = templateEl.getAttribute('data-slot-props');
const exposedProps = {};
for (const attr of slotEl.attributes) {
if (attr.name.startsWith(':')) {
const propName = attr.name.slice(1);
exposedProps[propName] = this._evaluate(attr.value);
} else if (attr.name.startsWith('data-props-')) {
const propName = attr.name.slice('data-props-'.length);
exposedProps[propName] = this._evaluate(attr.value);
}
}
const extraScope = { [slotPropsName]: exposedProps };
const parentComp = this.$parent || this;
return parentComp._evaluate(expr, extraScope);
}
return this.#resolveTemplateExpression(expr);
};
this.#patcher.patchElement(slotEl, newSlotWrapper, slotEvaluator, this.$app);
});
}
}
/**
* Internal method called before the component is mounted to the DOM.
* @private
*/
__beforeMount() {
this.#isBeforeMounting = true;
try {
this.#triggerLifecycle('onBeforeMount');
} catch (error) {
this.#reportError(error, '__beforeMount', true);
} finally {
this.#isBeforeMounting = false;
}
}
/**
* Internal method called after the component is mounted to the DOM.
* @private
*/
__afterMount() {
this.#isMounted = true;
try {
this.#resolveRefs();
if (typeof CustomEvent !== 'undefined' && this.#element?.dispatchEvent) {
this.#element.dispatchEvent(new CustomEvent('avenx:mount'));
}
this.#triggerLifecycle('onMount');
} catch (error) {
this.#reportError(error, '__afterMount', true);
}
}
/**
* Unmounts the component and triggers cleanup.
* @returns {Promise<void>|void}
*/
unmount() {
if (this.#isUnmounted) return;
if (this.#isUnmounting) return this.#unmountPromise;
this.#isUnmounting = true;
const res = this.#lifecycle.unmount(this);
if (res instanceof Promise) {
this.#unmountPromise = res;
return res;
}
}
/**
* Destroys/unmounts the component and performs teardown of watchers and resources.
* Alias for unmount().
* @returns {Promise<void>|void}
*/
destroy() {
return this.unmount();
}
/**
* Destroys/unmounts the component and performs teardown of watchers and resources.
* Alias for unmount().
* @returns {Promise<void>|void}
*/
$destroy() {
return this.unmount();
}
/**
* Performs the actual synchronous teardown and DOM clearing of the component.
* @private
*/
__performTeardown() {
try {
this.#eventBinder.unbind(this.#element);
this.#eventBinder.teardown();
this.#eventExecutor.teardown();
if (typeof CustomEvent !== 'undefined' && this.#element?.dispatchEvent) {
this.#element.dispatchEvent(new CustomEvent('avenx:unmount'));
}
this.#triggerLifecycle('onUnmount');
if (this.renderWatcher) {
this.renderWatcher.teardown();
}
// Every binding holds a watcher that sits in the dependency set of the
// state it read. Left in place they keep this component, its DOM and its
// scope reachable for as long as that state exists -- a leak proportional
// to how finely the template was bound, which is exactly the wrong way
// round.
if (this.#templateInstance) {
this.#templateInstance.dispose();
this.#templateInstance = null;
}
this.#postRenderQueued = false;
this.#beforeRenderFired = false;
if (this._injectedAncestors) {
for (const { ancestor, key } of this._injectedAncestors) {
ancestor.__unregisterInjectingChild(key, this);
}
this._injectedAncestors = [];
}
if (this._watchers) {
for (const watcher of this._watchers) {
watcher.teardown();
}
this._watchers = [];
}
// Releases bridge subscriptions (and anything else scope-owned) opened
// by this component's hooks and handlers.
if (this._scope) {
this._scope.dispose();
}
if (this._stateHandler) {
this._stateHandler.teardown();
}
if (this._propsHandler) {
this._propsHandler.teardown();
}
if (this.#resources) {
for (const res of Object.values(this.#resources)) {
if (res && typeof res.teardown === 'function') {
res.teardown();
}
}
}
this.#refsCache = {};
this.#refsDirty = false;
if (this.#element) {
// Custom-directive `unmounted` hooks, and only those. The metadata they
// read -- `__avenx_directives` -- is written in exactly one place, the
// string renderer's attribute patch, so a bundle without that renderer
// has nothing here to trigger.
//
// Reaching for `#patcher` unconditionally therefore threw on every
// teardown in a fully compiled application, where the renderer is
// correctly absent. The throw was caught below and, until unhandled
// errors were reported, discarded -- so the rest of this block never
// ran: the instance stayed on the element, its content stayed in the
// document, and nothing said why. Skipping the call when there is
// provably nothing to call is both the fix and the honest description
// of the condition.
if (hasStringRenderer()) {
this.#patcher.triggerUnmounted(this.#element, this.$app);
}
delete this.#element.__avenx_comp_instance;
this.#element.innerHTML = '';
this.#element = null;
}
} catch (error) {
this.#reportError(error, '__performTeardown');
}
// Decrement runtime style reference count for this component class
styleMountManager.unmount(this.constructor);
this.#isMounted = false;
this.#isUnmounting = false;
this.#isUnmounted = true;
this.#unmountPromise = null;
}
/**
* Called before the component leaves the DOM.
* Can return a Promise to postpone DOM removal.
* @returns {Promise<void>|void}
*/
onBeforeLeave() { }
/**
* Called when the component is mounted to the DOM and enters.
*/
onEnter() { }
/**
* Called when the component is unmounted and leaves the DOM.
*/
onLeave() { }
/**
* Updates the component's props and triggers an update if they changed.
* @param {object} newProps - The new props to apply.
*/
setProps(newProps) {
const currentProps = this.props;
for (const key of Object.keys(newProps)) {
if (currentProps[key] !== newProps[key]) {
currentProps[key] = newProps[key];
}
}
for (const key of Object.keys(currentProps)) {
if (!(key in newProps)) {
delete currentProps[key];
}
}
}
/**
* The current active route metadata.
* @returns {{hash: string, path: string, page: string, params: Record<string, any>, query: Record<string, string | boolean | number>}} The route details.
*/
get $route() {
if (typeof window !== 'undefined' && window.__avenx_routers) {
for (const router of window.__avenx_routers) {
if (router.currentRoute && router.currentRoute.hash) {
return router.currentRoute;
}
}
}
return { hash: '', path: '', page: '', params: {}, query: {}, meta: {} };
}
/**
* Evaluates an expression in the component's scope.
* @param {string} expression - The expression to evaluate.
* @param {object} [extraScope] - Additional scope variables.
* @returns {any} The result of the evaluation.
* @protected
*/
_evaluate(expression, extraScope = {}) {
return this.#evaluator.evaluateExpression(expression, this.#createScope(this.#methods, extraScope), this.state);
}
/**
* @returns {Element|null} The component's root element.
* @protected
*/
_getElement() {
return this.#element;
}
/**
* @returns {object} The bridges accessible to the component.
* @protected
*/
_getBridges() {
return this.#bridges;
}
/**
* Returns the set of active compiler contracts for this component.
* @returns {Set<string>}
*/
get contracts() {
return this.#contracts;
}
/**
* Retrieves the transcluded groups for this component.
* @returns {object} The transcluded groups.
* @protected
*/
_getTranscludedGroups() {
return this.#transcludedGroups;
}
/**
* Mounts the component to a target element.
* @param {Element|string} target - The target element or selector.
*/
mount(target) {
this.#lifecycle.mount(this, target);
}
/**
* Internal method to initialize injected properties from ancestors.
* @private
*/
__initInjection() {
const injectOption =
this.inject ||
(typeof this.constructor.inject === 'function' ? this.constructor.inject() : this.constructor.inject);
if (!injectOption) return;
let injectMap = {};
const resolvedOption = typeof injectOption === 'function' ? injectOption.call(this) : injectOption;
if (Array.isArray(resolvedOption)) {
for (const key of resolvedOption) {
injectMap[key] = key;
}
} else if (resolvedOption && typeof resolvedOption === 'object') {
injectMap = resolvedOption;
}
for (const [localKey, injectDef] of Object.entries(injectMap)) {
let provideKey = injectDef;
let defaultValue;
let hasDefault = false;
if (injectDef && typeof injectDef === 'object' && !Array.isArray(injectDef)) {
provideKey = injectDef.from != null ? injectDef.from : localKey;
if (Object.prototype.hasOwnProperty.call(injectDef, 'default')) {
hasDefault = true;
defaultValue = injectDef.default;
}
}
Object.defineProperty(this, localKey, {
get: () => {
const ancestor = this.#findAncestorProviding(provideKey);
if (!ancestor) {
if (hasDefault) {
return typeof defaultValue === 'function' ? defaultValue.call(this) : defaultValue;
}
logger.warn(
formatMessage(AvenxErrorCodes.COMPONENT_INJECT_KEY_NOT_FOUND, provideKey),
this.$logContext
);
return undefined;
}
if (!this._injectedAncestors) {
this._injectedAncestors = [];
}
const alreadyRegistered = this._injectedAncestors.some(
(reg) => reg.ancestor === ancestor && reg.key === provideKey
);
if (!alreadyRegistered) {
ancestor.__registerInjectingChild(provideKey, this);
this._injectedAncestors.push({ ancestor, key: provideKey });
}
return this.#getAncestorProvidedValue(ancestor, provideKey);
},
enumerable: true,
configurable: true,
});
}
}
/**
* Finds the nearest ancestor component that provides the specified key.
* @param {string} key - The provided key to search for.
* @returns {AvenxComponent|null} The ancestor component instance, or null.
* @private
*/
#findAncestorProviding(key) {
const el = this._getElement();
if (!el) return null;
let parentEl = el.parentNode;
while (parentEl) {
if (parentEl.__avenx_comp_instance) {
const comp = parentEl.__avenx_comp_instance;
if (this.#componentProvides(comp, key)) {
return comp;
}
}
parentEl = parentEl.parentNode;
}
return null;
}
/**
* Checks if a component provides the specified key.
* @param {AvenxComponent} comp - The component to check.
* @param {string} key - The provided key.
* @returns {boolean} True if the component provides the key.
* @private
*/
#componentProvides(comp, key) {
const provideOption =
comp.provide ||
(typeof comp.constructor.provide === 'function' ? comp.constructor.provide() : comp.constructor.provide);
if (!provideOption) return false;
const resolved = typeof provideOption === 'function' ? provideOption.call(comp) : provideOption;
if (Array.isArray(resolved)) {
return resolved.includes(key);
} else if (resolved && typeof resolved === 'object') {
return key in resolved;
}
return false;
}
/**
* Retrieves the provided value for a key from an ancestor component.
* @param {AvenxComponent} comp - The ancestor component instance.
* @param {string} key - The provided key.
* @returns {any} The value.
* @private
*/
#getAncestorProvidedValue(comp, key) {
if (comp._providedState && key in comp._providedState) {
const val = comp._providedState[key];
if (typeof val === 'function') {
return val;
}
return val;
}
const provideOption =
comp.provide ||
(typeof comp.constructor.provide === 'function' ? comp.constructor.provide() : comp.constructor.provide);
if (!provideOption) return undefined;
const resolved = typeof provideOption === 'function' ? provideOption.call(comp) : provideOption;
if (Array.isArray(resolved)) {
return comp._getScopeValue(key);
} else if (resolved && typeof resolved === 'object') {
const val = resolved[key];
if (typeof val === 'function') {
return val.bind(comp);
}
return val;
}
return undefined;
}
/**
* Internal method to initialize provided properties as a reactive proxy.
* @private
*/
__initProvide() {
const provideOption =
this.provide ||
(typeof this.constructor.provide === 'function' ? this.constructor.provide() : this.constructor.provide);
if (!provideOption) return;
const resolved = typeof provideOption === 'function' ? provideOption.call(this) : provideOption;
if (resolved && typeof resolved === 'object' && !Array.isArray(resolved)) {
// Create a reactive proxy of the provided object
const handlerFactory = new ProxyHandlerFactory({
onChange: () => {
this.__notifyInjectingChildren();
},
});
this._providedState = new Proxy(resolved, handlerFactory.create());
}
}
/**
* Registers a child component that is injecting a provided key.
* @param {string} key - The provided key.
* @param {AvenxComponent} child - The child component.
*/
__registerInjectingChild(key, child) {
if (!this._injectingChildren) {
this._injectingChildren = new Map();
}
let children = this._injectingChildren.get(key);
if (!children) {
children = new Set();
this._injectingChildren.set(key, children);
}
children.add(child);
}
/**
* Unregisters an injecting child component.
* @param {string} key - The provided key.
* @param {AvenxComponent} child - The child component.
*/
__unregisterInjectingChild(key, child) {
if (this._injectingChildren) {
const children = this._injectingChildren.get(key);
if (children) {
children.delete(child);
}
}
}
/**
* Notifies all registered injecting child components that a provided value has shifted.
*/
__notifyInjectingChildren() {
if (this._injectingChildren) {
for (const children of this._injectingChildren.values()) {
for (const child of children) {
child.scheduleUpdate();
}
}
}
}
/**
* Dynamically re-evaluates the provide option and updates providedState.
*/
__updateProvidedState() {
if (!this._providedState) return;
const provideOption =
this.provide ||
(typeof this.constructor.provide === 'function' ? this.constructor.provide() : this.constructor.provide);
if (!provideOption) return;
const resolved = typeof provideOption === 'function' ? provideOption.call(this) : provideOption;
if (resolved && typeof resolved === 'object' && !Array.isArray(resolved)) {
const rawProvided = this._providedState[RAW_SYMBOL] || this._providedState;
for (const [k, v] of Object.entries(resolved)) {
if (rawProvided[k] !== v) {
this._providedState[k] = v;
}
}
}
}
/**
* Retrieves a property or method from the component's scope.
* Used for array-based provide to resolve keys dynamically.
* @param {string} key - The key to retrieve.
* @returns {any} The value.
* @protected
*/
_getScopeValue(key) {
if (this.state && key in this.state) {
return this.state[key];
}
if (this.props && key in this.props) {
return this.props[key];
}
if (this.#methods && key in this.#methods) {
return this.#methods[key];
}
if (this.#bridges && key in this.#bridges) {
return this.#bridges[key];
}
if (key in this) {
return this[key];
}
return undefined;
}
/**
* Resolves the app instance associated with this component.
* @returns {AvenxApp|null}
*/
get $app() {
if (this._app) {
return this._app;
}
if (this.$parent) {
return this.$parent.$app;
}
const el = this.$element;
if (el) {
let parentEl = el.parentNode;
while (parentEl) {
if (parentEl.__avenx_comp_instance) {
const comp = parentEl.__avenx_comp_instance;
if (comp._app) return comp._app;
if (comp.$parent) {
const app = comp.$parent.$app;
if (app) return app;
}
}
parentEl = parentEl.parentNode;
}
}
return null;
}
/**
* Sets the app instance associated with this component.
* @param {AvenxApp} app - The app instance.
*/
set $app(app) {
this._app = app;
}
/**
* Invokes all registered lifecycle hooks for the specified event.
* @param {string} hookName - The name of the lifecycle hook.
* @private
*/
#triggerLifecycle(hookName) {
const hooks = [];
for (const mixin of globalMixins) {
if (mixin[hookName] && typeof mixin[hookName] === 'function') {
hooks.push(mixin[hookName].bind(this));
} else if (mixin.methods && mixin.methods[hookName] && typeof mixin.methods[hookName] === 'function') {
hooks.push(mixin.methods[hookName].bind(this));
}
}
const selfHook = this.#methods[hookName] || (typeof this[hookName] === 'function' ? this[hookName].bind(this) : null);
if (selfHook) {
hooks.push(selfHook);
}
for (const hook of hooks) {
try {
const enableProfiling = !!(this.$app?.enableProfiling || (typeof window !== 'undefined' && window.__avenx_enable_profiling));
profile(enableProfiling, this.constructor.name, hookName, () => {
runInScope(this._scope, hook);
});
} catch (error) {
if (error && error.code === AvenxErrorCodes.STATE_MUTATION_IN_UPDATE) {
throw error;
}
logger.error(formatMessage(AvenxErrorCodes.LIFECYCLE_HOOK_ERROR, this.constructor.name, hookName, error), this.$logContext);
this.#reportError(error, hookName, true);
}
}
}
/**
* Reports an error to the global application error handler, if registered.
* If a parent component defines an onErrorCaptured hook, it is invoked first.
* If onErrorCaptured returns false, the error propagation is stopped.
*
* `logged` says whether the call site has already written the error to the
* log with a diagnostic of its own. Several have: a failing lifecycle hook is
* reported as AVX_R12 and a failing handler as AVX_R09, each naming the hook
* or the statement, which is more specific than anything this method knows.
* Those keep their message and are not reported a second time.
*
* The call sites that pass nothing are the ones where this method is the only
* thing standing between an error and silence -- a failed render above all.
* @param {Error} error - The error that occurred.
* @param {string} origin - Description of where the error occurred.
* @param {boolean} [logged] - Whether the caller already logged this error.
* @private
*/
#reportError(error, origin, logged = false) {
let current = this;
let currentError = error;
while (current) {
const hooks = [];
for (const mixin of globalMixins) {
if (mixin['onErrorCaptured'] && typeof mixin['onErrorCaptured'] === 'function') {
hooks.push(mixin['onErrorCaptured'].bind(current));
} else if (mixin.methods && mixin.methods['onErrorCaptured'] && typeof mixin.methods['onErrorCaptured'] === 'function') {
hooks.push(mixin.methods['onErrorCaptured'].bind(current));
}
}
const selfHook = current.#methods['onErrorCaptured'] || (typeof current['onErrorCaptured'] === 'function' ? current['onErrorCaptured'].bind(current) : null);
if (selfHook) {
hooks.push(selfHook);
}
if (hooks.length > 0) {
let stopPropagation = false;
for (const hook of hooks) {
try {
const result = hook(currentError, this, origin);
if (result === false) {
stopPropagation = true;
}
} catch (hookError) {
currentError = hookError;
origin = 'onErrorCaptured hook';
}
}
if (stopPropagation) {
return;
}
}
current = current.$parent;
}
const app = this.$app;
if (app && typeof app._handleError === 'function') {
app._handleError(currentError, this, origin, logged);
return;
}
if (logged) {
// The call site already said what happened, with a diagnostic more
// specific than this one.
return;
}
// No application is reachable -- a component mounted on its own, or one
// whose element is not in the document yet. `$app` walks the parent chain
// and then the DOM, so this is uncommon, but it used to be the second way
// an error could disappear: the chain above found no `onErrorCaptured`,
// there was nothing to hand the error to, and the method simply ended.
// Silence has to cost something, so it costs a report here as well.
logger.error(
formatMessage(
AvenxErrorCodes.COMPONENT_RENDER_ABORTED,
this.constructor?.name || 'component',
origin || 'render',
(currentError && (currentError.stack || currentError.message)) || String(currentError),
),
);
}
/**
* Syncs the value property of select elements to match their value attribute
* after child nodes and lists are fully patched/rendered.
* @private
*/
#syncSelectElements() {
if (!this.#element || typeof this.#element.querySelectorAll !== 'function') return;
const selects = this.#element.querySelectorAll('select') || [];
const isSelect = typeof this.#element.getAttribute === 'function' && this.#element.tagName === 'SELECT';
const allSelects = isSelect ? [this.#element, ...selects] : selects;
for (const select of allSelects) {
if (typeof select.getAttribute === 'function') {
const valueAttr = select.getAttribute('value');
if (valueAttr !== null) {
if (select.value !== valueAttr) {
select.value = valueAttr;
}
}
}
}
}
/**
* Suspends the component rendering and shows the fallback UI if available.
* @param {Promise<any>} promise
* @private
*/
#suspend(promise) {
if (!this.#element) return;
const fallbackMatch = this.#template.match(/<template data-ax-fallback[^>]*>([\s\S]*?)<\/template>/i);
if (!fallbackMatch) {
if (this.$parent) {
this.$parent.#suspend(promise);
}
return;
}
const fallbackHtml = fallbackMatch[1].replace(/\{%/g, '{{').replace(/%\}/g, '}}');
try {
const renderedFallback = this.#renderer.render(fallbackHtml, (expression) => this.#resolveTemplateExpression(expression));
this.#patcher.patch(this.#element, renderedFallback, (expression, slotScope) => this.#resolveTemplateExpression(expression, slotScope), this.$app);
this.#fillSlots();
this.#listManager.process(this.#element, this.#createScope(), this.state, this.$app);
this.#eventBinder.bind(this.#element, this.#eventExecutor);
} catch (error) {
if (error instanceof Promise) {
if (this.$parent) {
this.$parent.#suspend(error);
}
} else {
this.#handleComponentError(error);
}
}
promise.finally(() => {
this.update();
});
}
/**
* Handles component rendering errors using error boundaries.
* @param {Error} error
* @private
*/
#handleComponentError(error) {
if (!this.#element) return;
this.#componentError = error;
let errorAs = 'error';
const asMatch = this.#template.match(/data-ax-error-as="([^"]*)"/i);
if (asMatch) {
errorAs = asMatch[1];
}
const fallbackMatch = this.#template.match(/<template data-ax-error-fallback[^>]*>([\s\S]*?)<\/template>/i);
if (!fallbackMatch) {
if (this.$parent) {
this.$parent.#handleComponentError(error);
} else {
this.#reportError(error, 'runUpdate');
}
return;
}
const fallbackHtml = fallbackMatch[1].replace(/\{%/g, '{{').replace(/%\}/g, '}}');
const extraScope = { [errorAs]: error };
try {
const renderedFallback = this.#renderer.render(fallbackHtml, (expression) => this.#resolveTemplateExpression(expression, extraScope));
this.#patcher.patch(this.#element, renderedFallback, (expression, slotScope) => this.#resolveTemplateExpression(expression, { ...extraScope, ...slotScope }), this.$app);
this.#fillSlots();
this.#listManager.process(this.#element, this.#createScope(this.#methods, extraScope), this.state, this.$app);
this.#eventBinder.bind(this.#element, this.#eventExecutor);
} catch (e) {
if (this.$parent) {
this.$parent.#handleComponentError(e);
} else {
this.#reportError(e, 'ErrorBoundary');
}
}
}
/**
* Registers a global mixin.
* @param {object} mixin - The mixin definition.
*/
static mixin(mixin) {
if (mixin && typeof mixin === 'object') {
globalMixins.push(mixin);
}
}
/**
* Resets/clears the global mixins list.
* Useful for testing environments.
*/
static clearMixins() {
globalMixins.length = 0;
}
/**
* Helper method to programmatically create component subclasses without ES class boilerplate.
* @param {object} [options] - Component definition options.
* @returns {Function} The generated component subclass.
*/
static extend(options = {}) {
const SuperClass = this;
const parentOptions = SuperClass.__options || {};
const componentName =
options.name ||
(SuperClass.name && SuperClass.name !== 'AvenxComponent'
? `${SuperClass.name}Extended`
: 'ExtendedComponent');
const reservedKeys = new Set([
'name',
'state',
'data',
'computed',
'template',
'methods',
'props',
'styles',
'resources',
'contracts',
'watch',
'provide',
'inject',
'options',
]);
const lifecycleHookNames = new Set([
'onBeforeMount',
'onMount',
'onBeforeUpdate',
'onUpdate',
'onUnmount',
'onActivate',
'onDeactivate',
'onErrorCaptured',
'onEnter',
'onLeave',
'onBeforeLeave',
]);
// Merge methods
const explicitMethods = {
...(parentOptions.methods || {}),
...(options.methods || {}),
};
// Extract top-level methods & lifecycle hooks
for (const [key, value] of Object.entries(options)) {
if (!reservedKeys.has(key) && typeof value === 'function') {
explicitMethods[key] = value;
}
}
// Separate regular methods (for #methods/super) and lifecycle hooks
const regularMethods = {};
for (const [key, fn] of Object.entries(explicitMethods)) {
if (!lifecycleHookNames.has(key)) {
regularMethods[key] = fn;
}
}
const finalComputed = {
...(parentOptions.computed || {}),
...(options.computed || {}),
};
const finalTemplate =
options.template !== undefined
? options.template
: (parentOptions.template !== undefined ? parentOptions.template : '');
const finalProps = {
...(parentOptions.props || {}),
...(options.props || {}),
};
const finalStyles = {
...(parentOptions.styles || {}),
...(options.styles || {}),
};
const finalResources = {
...(parentOptions.resources || {}),
...(options.resources || {}),
};
const finalWatch = {
...(parentOptions.watch || {}),
...(options.watch || {}),
};
const parentContracts = Array.isArray(parentOptions.contracts)
? parentOptions.contracts
: (parentOptions.contracts instanceof Set ? Array.from(parentOptions.contracts) : []);
const childContracts = Array.isArray(options.contracts)
? options.contracts
: (options.contracts instanceof Set ? Array.from(options.contracts) : []);
const finalContracts = Array.from(new Set([...parentContracts, ...childContracts]));
const finalOptions = {
...(parentOptions.options || {}),
...(options.options || {}),
contracts: finalContracts,
watch: finalWatch,
};
/**
* Resolves and clones initial state from a state/data definition.
* @param {object|Function} stateDef - The state definition.
* @returns {object} The resolved state object.
*/
function resolveState(stateDef) {
if (typeof stateDef === 'function') {
return stateDef();
}
if (stateDef && typeof stateDef === 'object') {
try {
if (typeof globalThis !== 'undefined' && typeof globalThis.structuredClone === 'function') {
return globalThis.structuredClone(stateDef);
}
return JSON.parse(JSON.stringify(stateDef));
} catch {
return { ...stateDef };
}
}
return {};
}
const ExtendedComponent = {
[componentName]: class extends SuperClass {
/**
* @param {...any} args - Constructor arguments.
*/
constructor(...args) {
let runtimeBridges = {};
let runtimeProps = {};
if (args.length >= 8) {
const [cState, cComputed, cBridges, cTemplate, cMethods, cProps, cStyles, cResources, cOptions] = args;
const parentDefState = resolveState(parentOptions.state || parentOptions.data);
const childDefState = resolveState(options.state || options.data);
const mergedState = { ...parentDefState, ...childDefState, ...(cState || {}) };
const mergedComputed = { ...finalComputed, ...(cComputed || {}) };
const mergedTemplate = cTemplate !== undefined ? cTemplate : finalTemplate;
const mergedMethods = { ...regularMethods, ...(cMethods || {}) };
const mergedProps = { ...finalProps, ...(cProps || {}) };
const mergedStyles = { ...finalStyles, ...(cStyles || {}) };
const mergedResources = { ...finalResources, ...(cResources || {}) };
const mergedOptions = { ...finalOptions, ...(cOptions || {}) };
super(
mergedState,
mergedComputed,
cBridges || {},
mergedTemplate,
mergedMethods,
mergedProps,
mergedStyles,
mergedResources,
mergedOptions
);
return;
}
if (args.length === 1) {
if (args[0] && typeof args[0] === 'object') {
runtimeBridges = args[0];
runtimeProps = args[0];
}
} else if (args.length >= 2) {
runtimeBridges = args[0] || {};
runtimeProps = args[1] || {};
}
const parentDefState = resolveState(parentOptions.state || parentOptions.data);
const childDefState = resolveState(options.state || options.data);
const mergedState = { ...parentDefState, ...childDefState };
const mergedProps = { ...finalProps, ...runtimeProps };
super(
mergedState,
finalComputed,
runtimeBridges,
finalTemplate,
regularMethods,
mergedProps,
finalStyles,
finalResources,
finalOptions
);
}
},
}[componentName];
Object.defineProperty(ExtendedComponent, 'name', {
value: componentName,
configurable: true,
});
ExtendedComponent.__isExtendedComponent = true;
ExtendedComponent.__options = {
name: componentName,
state: options.state || options.data || parentOptions.state || parentOptions.data,
computed: finalComputed,
methods: explicitMethods,
template: finalTemplate,
props: finalProps,
styles: finalStyles,
resources: finalResources,
watch: finalWatch,
contracts: finalContracts,
options: finalOptions,
provide: options.provide || parentOptions.provide,
inject: options.inject || parentOptions.inject,
};
// Attach all methods & lifecycle hooks to ExtendedComponent.prototype
for (const [name, fn] of Object.entries(explicitMethods)) {
if (typeof fn === 'function') {
ExtendedComponent.prototype[name] = fn;
}
}
// Attach computed getters to ExtendedComponent.prototype
for (const name of Object.keys(finalComputed)) {
if (!(name in ExtendedComponent.prototype)) {
Object.defineProperty(ExtendedComponent.prototype, name, {
get() {
return this.state ? this.state[name] : undefined;
},
configurable: true,
enumerable: true,
});
}
}
// Attach provide & inject
if (options.provide || parentOptions.provide) {
ExtendedComponent.prototype.provide = options.provide || parentOptions.provide;
}
if (options.inject || parentOptions.inject) {
ExtendedComponent.prototype.inject = options.inject || parentOptions.inject;
}
// Copy any custom non-function / extra properties from options to prototype
for (const [key, value] of Object.entries(options)) {
if (!reservedKeys.has(key) && typeof value !== 'function') {
ExtendedComponent.prototype[key] = value;
}
}
return ExtendedComponent;
}
}
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