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lib: implement AbortSignal.abort() #37693

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lib: implement AbortSignal.abort() #37693

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0b60272
lib: implement AbortSignal.abort()
jasnell Mar 10, 2021
ce6be51
test: update dom/abort tests
jasnell Mar 15, 2021
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1 change: 1 addition & 0 deletions .eslintrc.js
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Expand Up @@ -315,6 +315,7 @@ module.exports = {
},
globals: {
AbortController: 'readable',
AbortSignal: 'readable',
Atomics: 'readable',
BigInt: 'readable',
BigInt64Array: 'readable',
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9 changes: 9 additions & 0 deletions doc/api/globals.md
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Expand Up @@ -67,6 +67,15 @@ added: v15.0.0
The `AbortSignal` is used to notify observers when the
`abortController.abort()` method is called.

#### Static method: `AbortSignal.abort()`
<!-- YAML
added: REPLACEME
-->

* Returns: {AbortSignal}

Returns a new already aborted `AbortSignal`.

#### Event: `'abort'`
<!-- YAML
added: v15.0.0
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8 changes: 6 additions & 2 deletions lib/internal/abort_controller.js
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Expand Up @@ -50,6 +50,10 @@ class AbortSignal extends EventTarget {
aborted: this.aborted
}, depth, options);
}

static abort() {
return createAbortSignal(true);
}
}

ObjectDefineProperties(AbortSignal.prototype, {
Expand All @@ -65,10 +69,10 @@ ObjectDefineProperty(AbortSignal.prototype, SymbolToStringTag, {

defineEventHandler(AbortSignal.prototype, 'abort');

function createAbortSignal() {
function createAbortSignal(aborted = false) {
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Why this approach rather than doing new AbortSignalesque?

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new AbortSignal() is not permitted by the spec.

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Oh, right, we ended up doing this and not the "fake parameter in constructor" approach.

const signal = new EventTarget();
ObjectSetPrototypeOf(signal, AbortSignal.prototype);
signal[kAborted] = false;
signal[kAborted] = aborted;
return signal;
}

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5 changes: 5 additions & 0 deletions test/parallel/test-abortcontroller.js
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Expand Up @@ -67,3 +67,8 @@ const { ok, strictEqual, throws } = require('assert');
strictEqual(toString(ac), '[object AbortController]');
strictEqual(toString(ac.signal), '[object AbortSignal]');
}

{
const signal = AbortSignal.abort();
ok(signal.aborted);
}