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Improve the type assertion for is.asyncFunction

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This commit is contained in:
Sindre Sorhus 2019-11-07 16:28:20 +07:00
parent af6b03d67f
commit c25b606c3b
3 changed files with 8 additions and 3 deletions
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2
package.json
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@ -59,7 +59,7 @@
"rxjs": "^6.4.0", "rxjs": "^6.4.0",
"tempy": "^0.3.0", "tempy": "^0.3.0",
"ts-node": "^8.3.0", "ts-node": "^8.3.0",
"typescript": "^3.4.1", "typescript": "^3.7.2",
"xo": "^0.25.3", "xo": "^0.25.3",
"zen-observable": "^0.8.8" "zen-observable": "^0.8.8"
}, },

3
source/index.ts
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@ -152,8 +152,7 @@ is.promise = (value: unknown): value is Promise<unknown> => is.nativePromise(val
is.generatorFunction = isObjectOfType<GeneratorFunction>(TypeName.GeneratorFunction); is.generatorFunction = isObjectOfType<GeneratorFunction>(TypeName.GeneratorFunction);
// eslint-disable-next-line @typescript-eslint/ban-types is.asyncFunction = (value: unknown): value is ((...args: any[]) => Promise<unknown>) => getObjectType(value) === TypeName.AsyncFunction;
is.asyncFunction = isObjectOfType<Function>(TypeName.AsyncFunction);
// eslint-disable-next-line no-prototype-builtins, @typescript-eslint/ban-types // eslint-disable-next-line no-prototype-builtins, @typescript-eslint/ban-types
is.boundFunction = (value: unknown): value is Function => is.function_(value) && !value.hasOwnProperty('prototype'); is.boundFunction = (value: unknown): value is Function => is.function_(value) && !value.hasOwnProperty('prototype');

6
test/test.ts
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@ -560,6 +560,12 @@ test('is.promise', t => {
test('is.asyncFunction', t => { test('is.asyncFunction', t => {
testType(t, 'asyncFunction', ['function']); testType(t, 'asyncFunction', ['function']);
const fixture = async () => {};
if (is.asyncFunction(fixture)) {
// eslint-disable-next-line promise/prefer-await-to-then
t.true(is.function_(fixture().then));
}
}); });
test('is.generator', t => { test('is.generator', t => {