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Create promise lazily #5189

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merged 1 commit into from Dec 20, 2019
Merged

Create promise lazily #5189

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8 changes: 6 additions & 2 deletions src/internal/util/Immediate.ts
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@@ -1,5 +1,6 @@
let nextHandle = 1;
const RESOLVED = (() => Promise.resolve())();
// The promise needs to be created lazily otherwise it won't be patched by Zones
let resolved: Promise<any>;
const activeHandles: { [key: number]: any } = {};

/**
Expand All @@ -22,7 +23,10 @@ export const Immediate = {
setImmediate(cb: () => void): number {
const handle = nextHandle++;
activeHandles[handle] = true;
RESOLVED.then(() => findAndClearHandle(handle) && cb());
if (!resolved) {
resolved = Promise.resolve();
}
resolved.then(() => findAndClearHandle(handle) && cb());
return handle;
},

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