| 1 | const doNothing = () => undefined;
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| 2 | /**
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| 3 | * Creates a new promise and exposes its resolver function.
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| 4 | * Use with care!
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| 5 | */
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| 6 | export function createPromiseWithResolver() {
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| 7 | let alreadyResolved = false;
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| 8 | let resolvedTo;
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| 9 | let resolver = doNothing;
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| 10 | const promise = new Promise(resolve => {
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| 11 | if (alreadyResolved) {
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| 12 | resolve(resolvedTo);
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| 13 | }
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| 14 | else {
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| 15 | resolver = resolve;
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| 16 | }
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| 17 | });
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| 18 | const exposedResolver = (value) => {
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| 19 | alreadyResolved = true;
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| 20 | resolvedTo = value;
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| 21 | resolver();
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| 22 | };
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| 23 | return [promise, exposedResolver];
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| 24 | }
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