定义接口

interface Settings {
  lang: 'en' | 'da';
  welcome: boolean;
}

强制键为设置界面的特定键

private setSettings(key: keyof Settings, value: any) {
   // Update settings key
}

基于@shabunc的答案，这将允许将键或值(或两者都是)强制为您想强制的任何值。

type IdentifierKeys = 'my.valid.key.1' | 'my.valid.key.2';
type IdentifierValues = 'my.valid.value.1' | 'my.valid.value.2';

let stuff = new Map<IdentifierKeys, IdentifierValues>();

也应该使用enum而不是类型定义。

interface AccountSelectParams {
  ...
}
const params = { ... };

const tmpParams: { [key in keyof AccountSelectParams]: any } | undefined = {};
  for (const key of Object.keys(params)) {
    const customKey = (key as keyof typeof params);
    if (key in params && params[customKey] && !this.state[customKey]) {
      tmpParams[customKey] = params[customKey];
    }
  }

如果你明白这个概念，请评论

var stuff: { [key: string]: string; } = {};
stuff['a'] = ''; // ok
stuff['a'] = 4;  // error

// ... or, if you're using this a lot and don't want to type so much ...
interface StringMap { [key: string]: string; }
var stuff2: StringMap = { };
// same as above

type KeyOf<T> = keyof T;

class SomeClass<T, R> {
  onlyTFieldsAllowed = new Map<KeyOf<T>, R>();
}

class A {
  myField = 'myField';
}

const some = new SomeClass<A, any>();

some.onlyTFieldsAllowed.set('myField', 'WORKS');
some.onlyTFieldsAllowed.set('noneField', 'Not Allowed!');

实际上有一个内置的实用程序记录:

    const record: Record<string, string> = {};
    record['a'] = 'b';
    record[1] = 'c'; // leads to typescript error
    record['d'] = 1; // leads to typescript error