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* @file scope.js
* @description Disposal scopes for Avenx-JS.
*
* A disposal scope is the owner of every teardown callback created while it is
* active. Components run their lifecycle hooks and event handlers inside their
* own scope, so anything that registers a subscription during that window (most
* notably `bridge.on(...)`) is released automatically when the component
* unmounts. This mirrors how `$watch` watchers are already collected in
* `AvenxComponent._watchers` and torn down in `__performTeardown()`.
*/
/**
* The scope that currently owns newly created teardown callbacks.
* @type {DisposalScope|null}
*/
let activeScope = null;
/**
* Collects teardown callbacks and releases them together.
*/
export class DisposalScope {
/**
* @param {string} [name] - Debug label used in diagnostics.
*/
constructor(name = 'scope') {
/** @type {string} */
this.name = name;
/** @type {Set<Function>} */
this.disposers = new Set();
/** @type {boolean} */
this.disposed = false;
}
/**
* Registers a teardown callback with this scope.
* Disposing the scope runs it; running it earlier removes it from the scope.
* @param {Function} disposer - The teardown callback.
* @returns {Function} A wrapper that runs the teardown at most once.
*/
add(disposer) {
if (typeof disposer !== 'function') {
return () => {};
}
if (this.disposed) {
disposer();
return () => {};
}
let released = false;
const release = () => {
if (released) return;
released = true;
this.disposers.delete(release);
disposer();
};
this.disposers.add(release);
return release;
}
/**
* Runs every registered teardown callback and empties the scope.
* Safe to call more than once.
*/
dispose() {
this.disposed = true;
// Copy first: a disposer removes itself from the set while running.
const pending = [...this.disposers];
this.disposers.clear();
for (const release of pending) {
release();
}
}
}
/**
* Returns the scope that currently owns new teardown callbacks.
* @returns {DisposalScope|null} The active scope, or null outside of one.
*/
export function getScope() {
return activeScope;
}
/**
* Runs a function with the given scope active, restoring the previous scope
* afterwards. Passing `null` deliberately detaches ownership, which is how
* long-lived work (such as a bridge `setup()`) avoids being torn down by
* whichever component happened to touch it first.
* @template T
* @param {DisposalScope|null} scope - The scope to activate.
* @param {function(): T} fn - The function to run.
* @returns {T} Whatever `fn` returned.
*/
export function runInScope(scope, fn) {
const previous = activeScope;
activeScope = scope;
try {
return fn();
} finally {
activeScope = previous;
}
}
/**
* Registers a teardown callback with the active scope, if there is one.
* @param {Function} disposer - The teardown callback.
* @returns {Function} A release function that runs the teardown at most once.
*/
export function onScopeDispose(disposer) {
if (typeof disposer !== 'function') {
return () => {};
}
if (!activeScope) {
let released = false;
return () => {
if (released) return;
released = true;
disposer();
};
}
return activeScope.add(disposer);
}
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