forked from jestjs/jest
/
utility-types.test.ts
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/
utility-types.test.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {expectAssignable, expectNotAssignable, expectType} from 'tsd-lite';
import type {
ConstructorLike,
ConstructorLikeKeys,
MethodLike,
MethodLikeKeys,
PropertyLikeKeys,
} from 'jest-mock';
class SomeClass {
propertyB = 123;
private _propertyC: undefined;
#propertyD = 'abc';
constructor(public propertyA: string) {}
methodA(): void {
return;
}
methodB(b: string): string {
return b;
}
get propertyC() {
return this._propertyC;
}
set propertyC(value) {
this._propertyC = value;
}
}
const someObject = {
SomeClass,
methodA() {
return;
},
methodB(b: string) {
return true;
},
methodC: (c: number) => true,
propertyA: 123,
propertyB: 'value',
someClassInstance: new SomeClass('value'),
};
type SomeObject = typeof someObject;
// ClassLike
expectAssignable<ConstructorLike>(SomeClass);
expectNotAssignable<ConstructorLike>(() => {});
expectNotAssignable<ConstructorLike>(function abc() {
return;
});
expectNotAssignable<ConstructorLike>('abc');
expectNotAssignable<ConstructorLike>(123);
expectNotAssignable<ConstructorLike>(false);
expectNotAssignable<ConstructorLike>(someObject);
// FunctionLike
expectAssignable<MethodLike>(() => {});
expectAssignable<MethodLike>(function abc() {
return;
});
expectNotAssignable<MethodLike>('abc');
expectNotAssignable<MethodLike>(123);
expectNotAssignable<MethodLike>(false);
expectNotAssignable<MethodLike>(SomeClass);
expectNotAssignable<MethodLike>(someObject);
// ConstructorKeys
declare const constructorKeys: ConstructorLikeKeys<SomeObject>;
expectType<'SomeClass'>(constructorKeys);
// MethodKeys
declare const classMethods: MethodLikeKeys<SomeClass>;
declare const objectMethods: MethodLikeKeys<SomeObject>;
expectType<'methodA' | 'methodB'>(classMethods);
expectType<'methodA' | 'methodB' | 'methodC'>(objectMethods);
// PropertyKeys
declare const classProperties: PropertyLikeKeys<SomeClass>;
declare const objectProperties: PropertyLikeKeys<SomeObject>;
expectType<'propertyA' | 'propertyB' | 'propertyC'>(classProperties);
expectType<'propertyA' | 'propertyB' | 'someClassInstance'>(objectProperties);