文件操作 - value-of.d.ts
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文件: /usr/share/nodejs/type-fest/source/value-of.d.ts
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/** Create a union of the given object's values, and optionally specify which keys to get the values from. Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/31438) if you want to have this type as a built-in in TypeScript. @example ``` // data.json { 'foo': 1, 'bar': 2, 'biz': 3 } // main.ts import {ValueOf} from 'type-fest'; import data = require('./data.json'); export function getData(name: string): ValueOf<typeof data> { return data[name]; } export function onlyBar(name: string): ValueOf<typeof data, 'bar'> { return data[name]; } // file.ts import {getData, onlyBar} from './main'; getData('foo'); //=> 1 onlyBar('foo'); //=> TypeError ... onlyBar('bar'); //=> 2 ``` */ export type ValueOf<ObjectType, ValueType extends keyof ObjectType = keyof ObjectType> = ObjectType[ValueType];
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