/
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 {
ClassLike,
ConstructorLikeKeys,
FunctionLike,
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;
}
}
class IndexClass {
[key: string]: Record<string, any>;
propertyB = {b: 123};
private _propertyC = {c: undefined};
#propertyD = 'abc';
constructor(public propertyA: {a: string}) {}
methodA(): void {
return;
}
methodB(b: string): string {
return b;
}
get propertyC() {
return this._propertyC;
}
set propertyC(value) {
this._propertyC = value;
}
}
interface OptionalInterface {
constructorA?: (new (one: string) => SomeClass) | undefined;
constructorB: new (one: string, two: boolean) => SomeClass;
propertyA?: number | undefined;
propertyB?: number;
propertyC: number | undefined;
propertyD: string;
methodA?: ((a: boolean) => void) | undefined;
methodB: (b: string) => boolean;
}
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;
type IndexObject = {
[key: string]: Record<string, any>;
methodA(): void;
methodB(b: string): boolean;
methodC: (c: number) => boolean;
propertyA: {a: number};
propertyB: {b: string};
};
// ClassLike
expectAssignable<ClassLike>(SomeClass);
expectNotAssignable<ClassLike>(() => {});
expectNotAssignable<ClassLike>(function abc() {
return;
});
expectNotAssignable<ClassLike>('abc');
expectNotAssignable<ClassLike>(123);
expectNotAssignable<ClassLike>(false);
expectNotAssignable<ClassLike>(someObject);
// FunctionLike
expectAssignable<FunctionLike>(() => {});
expectAssignable<FunctionLike>(function abc() {
return;
});
expectNotAssignable<FunctionLike>('abc');
expectNotAssignable<FunctionLike>(123);
expectNotAssignable<FunctionLike>(false);
expectNotAssignable<FunctionLike>(SomeClass);
expectNotAssignable<FunctionLike>(someObject);
// ConstructorKeys
declare const interfaceConstructorKeys: ConstructorLikeKeys<OptionalInterface>;
declare const objectConstructorKeys: ConstructorLikeKeys<SomeObject>;
expectType<'constructorA' | 'constructorB'>(interfaceConstructorKeys);
expectType<'SomeClass'>(objectConstructorKeys);
// MethodKeys
declare const classMethods: MethodLikeKeys<SomeClass>;
declare const indexClassMethods: MethodLikeKeys<IndexClass>;
declare const interfaceMethods: MethodLikeKeys<OptionalInterface>;
declare const objectMethods: MethodLikeKeys<SomeObject>;
declare const indexObjectMethods: MethodLikeKeys<IndexObject>;
expectType<'methodA' | 'methodB'>(classMethods);
expectType<'methodA' | 'methodB'>(indexClassMethods);
expectType<'methodA' | 'methodB'>(interfaceMethods);
expectType<'methodA' | 'methodB' | 'methodC'>(objectMethods);
expectType<'methodA' | 'methodB' | 'methodC'>(indexObjectMethods);
// PropertyKeys
declare const classProperties: PropertyLikeKeys<SomeClass>;
declare const indexClassProperties: PropertyLikeKeys<IndexClass>;
declare const interfaceProperties: PropertyLikeKeys<OptionalInterface>;
declare const objectProperties: PropertyLikeKeys<SomeObject>;
declare const indexObjectProperties: PropertyLikeKeys<IndexObject>;
expectType<'propertyA' | 'propertyB' | 'propertyC'>(classProperties);
expectType<string | number>(indexClassProperties);
expectType<'propertyA' | 'propertyB' | 'propertyC' | 'propertyD'>(
interfaceProperties,
);
expectType<'propertyA' | 'propertyB' | 'someClassInstance'>(objectProperties);
expectType<string | number>(indexObjectProperties);