53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.awaitEachYieldedPromise = exports.maybeAsync = exports.maybeAsyncFn = void 0;
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function* awaitYield(value) {
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return (yield value);
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}
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function awaitYieldOf(generator) {
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return awaitYield(awaitEachYieldedPromise(generator));
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}
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const AwaitYield = awaitYield;
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AwaitYield.of = awaitYieldOf;
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/**
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* Create a function that may or may not be async, using a generator
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*
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* Within the generator, call `yield* awaited(maybePromise)` to await a value
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* that may or may not be a promise.
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*
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* If the inner function never yields a promise, it will return synchronously.
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*/
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function maybeAsyncFn(that, fn) {
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return (...args) => {
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const generator = fn.call(that, AwaitYield, ...args);
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return awaitEachYieldedPromise(generator);
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};
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}
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exports.maybeAsyncFn = maybeAsyncFn;
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class Example {
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constructor() {
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this.maybeAsyncMethod = maybeAsyncFn(this, function* (awaited, a) {
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yield* awaited(new Promise((resolve) => setTimeout(resolve, a)));
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return 5;
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});
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}
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}
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function maybeAsync(that, startGenerator) {
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const generator = startGenerator.call(that, AwaitYield);
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return awaitEachYieldedPromise(generator);
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}
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exports.maybeAsync = maybeAsync;
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function awaitEachYieldedPromise(gen) {
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function handleNextStep(step) {
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if (step.done) {
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return step.value;
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}
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if (step.value instanceof Promise) {
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return step.value.then((value) => handleNextStep(gen.next(value)), (error) => handleNextStep(gen.throw(error)));
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}
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return handleNextStep(gen.next(step.value));
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}
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return handleNextStep(gen.next());
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}
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exports.awaitEachYieldedPromise = awaitEachYieldedPromise;
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//# sourceMappingURL=asyncify-helpers.js.map
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