Last change
on this file since 6a80231 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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100644
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File size:
1.0 KB
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[6a3a178] | 1 | let nextHandle = 1;
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| 2 | const RESOLVED = (() => Promise.resolve())();
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| 3 | const activeHandles: { [key: number]: any } = {};
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| 4 |
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| 5 | /**
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| 6 | * Finds the handle in the list of active handles, and removes it.
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| 7 | * Returns `true` if found, `false` otherwise. Used both to clear
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| 8 | * Immediate scheduled tasks, and to identify if a task should be scheduled.
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| 9 | */
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| 10 | function findAndClearHandle(handle: number): boolean {
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| 11 | if (handle in activeHandles) {
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| 12 | delete activeHandles[handle];
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| 13 | return true;
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| 14 | }
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| 15 | return false;
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| 16 | }
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| 17 |
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| 18 | /**
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| 19 | * Helper functions to schedule and unschedule microtasks.
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| 20 | */
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| 21 | export const Immediate = {
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| 22 | setImmediate(cb: () => void): number {
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| 23 | const handle = nextHandle++;
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| 24 | activeHandles[handle] = true;
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| 25 | RESOLVED.then(() => findAndClearHandle(handle) && cb());
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| 26 | return handle;
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| 27 | },
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| 28 |
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| 29 | clearImmediate(handle: number): void {
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| 30 | findAndClearHandle(handle);
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| 31 | },
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| 32 | };
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| 33 |
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| 34 | /**
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| 35 | * Used for internal testing purposes only. Do not export from library.
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| 36 | */
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| 37 | export const TestTools = {
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| 38 | pending() {
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| 39 | return Object.keys(activeHandles).length;
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| 40 | }
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| 41 | };
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