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73 lines
2.7 KiB
73 lines
2.7 KiB
3 years ago
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/** 提取Promise返回值 */
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type UnboxPromise<T extends Promise<any>> = T extends Promise<infer U> ? U : never;
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/** 将联合类型转为交叉类型 */
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declare type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (
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k: infer I,
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) => void
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? I
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: never;
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/** eg: type result = StringToUnion<'abc'> 结果：'a'|'b'|'c'*/
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type StringToUnion<S extends string> = S extends `${infer S1}${infer S2}`
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? S1 | StringToUnion<S2>
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: never;
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/** 字符串替换，类似js的字符串replace方法 */
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type Replace<
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Str extends string,
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From extends string,
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To extends string,
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> = Str extends `${infer Left}${From}${infer Right}` ? `${Left}${To}${Right}` : Str;
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/** 字符串替换，类似js的字符串replaceAll方法 */
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type ReplaceAll<
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Str extends string,
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From extends string,
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To extends string,
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> = Str extends `${infer Left}${From}${infer Right}`
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? Replace<Replace<`${Left}${To}${Right}`, From, To>, From, To>
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: Str;
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/** eg: type result = CamelCase<'foo-bar-baz'>, 结果：fooBarBaz */
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type CamelCase<S extends string> = S extends `${infer S1}-${infer S2}`
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? S2 extends Capitalize<S2>
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? `${S1}-${CamelCase<S2>}`
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: `${S1}${CamelCase<Capitalize<S2>>}`
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: S;
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/** eg: type result = StringToArray<'abc'>, 结果：['a', 'b', 'c'] */
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type StringToArray<S extends string, T extends any[] = []> = S extends `${infer S1}${infer S2}`
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? StringToArray<S2, [...T, S1]>
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: T;
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/** `RequiredKeys`是用来获取所有必填字段，其中这些必填字段组合成一个联合类型 */
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type RequiredKeys<T> = {
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[P in keyof T]: T extends Record<P, T[P]> ? P : never;
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}[keyof T];
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/** `OptionalKeys`是用来获取所有可选字段，其中这些可选字段组合成一个联合类型 */
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type OptionalKeys<T> = {
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[P in keyof T]: {} extends Pick<T, P> ? P : never;
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}[keyof T];
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/** `GetRequired`是用来获取一个类型中，所有必填键及其类型所组成的一个新类型的 */
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type GetRequired<T> = {
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[P in RequiredKeys<T>]-?: T[P];
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};
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/** `GetOptional`是用来获取一个类型中，所有可选键及其类型所组成的一个新类型的 */
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type GetOptional<T> = {
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[P in OptionalKeys<T>]?: T[P];
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};
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/** type result1 = Includes<[1, 2, 3, 4], '4'> 结果： false; type result2 = Includes<[1, 2, 3, 4], 4> 结果： true */
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type Includes<T extends any[], K> = K extends T[number] ? true : false;
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/** eg:type result = MyConcat<[1, 2], [3, 4]> 结果：[1, 2, 3, 4]*/
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type MyConcat<T extends any[], U extends any[]> = [...T, ...U];
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/** eg: type result1 = MyPush<[1, 2, 3], 4> 结果：[1, 2, 3, 4] */
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type MyPush<T extends any[], K> = [...T, K];
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/** eg: type result3 = MyPop<[1, 2, 3]> 结果：[1, 2] */
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type MyPop<T extends any[]> = T extends [...infer L, infer R] ? L : never; // eslint-disable-line
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