制作动态可调用 typescript 接口属性

Question

这是调色板的一部分，我在这里使用IPalette界面：

{
  warningColor: '#FFCA28',
  smallWidgetBackground: ["rgba(255,255,255,0.15)", "rgba(255,255,255,0)"],
  grayColorAlpha: (opacity: number) => `rgba(200, 209, 232, ${opacity})`,
  welcome: {
    primaryText: "#fff",
    primaryTextAlpha: (alpha = 1) => `rgba(255,255,255,${alpha})`,
  },
}

问题是我想创建一个具有动态属性的接口，无论是作为字符串的键，还是键也是可调用的。

Answer 1

考虑这个例子：

type RGBA = `rgba(${number}, ${number}, ${number}, ${number})`

type Alpha = (opacity: number) => RGBA

type KeysHex = `${string}Color` | `${string}Text`

interface Data {
  [color: KeysHex]: `#${string}`
  [alpha: `${string}Alpha`]: Alpha
}

const foo: Data = {
  criticalColor: '2' // expected error
}

const bar: Data = {
  criticalColor: '#2' // ok, there is a limitation in TS
}

const baz: Data = {
  criticalColorAlpha: (opacity: number) => `rgba(1, 1, 1, ${opacity})` // ok
}

const baz2: Data = {
  criticalColorAlpha: (opacity: number) => `rgba(1, 1, 1, x)` // expected error
}

操场

我注意到，如果这是一种方法，则使用Alpha后缀；如果是 HEX 颜色，则使用Color或Text 。 这就是为什么我决定为Data接口使用两个不同的键。

您可以为RGBA使用 stonger 类型，但有一个限制。 请看我的文章和这个答案。

关于 HEX colors 的相同故事。请参阅本文。

请提供所有场景或限制，我会尽力为您提供最安全的类型。

谢谢

更新您在评论中使用的语法：

  [key in AdditionalKeysHex]:`#${string}`|string[];

是错的。 您只能在映射类型中使用in运算符。 为了实现所需的行为，我认为应该拆分Data接口。

请查看DataResult类型：

type RGBA = `rgba(${number}, ${number}, ${number}, ${number})`

type Alpha = (opacity: number) => RGBA

type KeysHex = `${string}Color` | `${string}Text` | `${string}Icon` | `${string}Background`;

const arr = ['white', 'darkGrayBlue', 'secondDarkGrayBlue', 'thirdDarkGrayBlue', 'darkDullBlue', 'secondDarkDullBlue', 'lightGrayBlue', 'secondLightGrayBlue', 'thirdLightGrayBlue', 'fourthLightGrayBlue', 'fifthLighGrayBlue', 'lightGrayNavy', 'paleNavy', 'brightBlue']

type AdditionalKeysHex = 'white' | 'darkGrayBlue' | 'secondDarkGrayBlue' | 'thirdDarkGrayBlue' | 'darkDullBlue' | 'secondDarkDullBlue' | 'lightGrayBlue' | 'secondLightGrayBlue' | 'thirdLightGrayBlue' | 'fourthLightGrayBlue' | 'fifthLighGrayBlue' | 'lightGrayNavy' | 'paleNavy' | 'brightBlue';

interface IWelcome {
  [color: KeysHex]: `#${string}` | string[];
  [alpha: `${string}Alpha`]: Alpha;
}


type WithKey = {
  [key in AdditionalKeysHex]: `#${string}` | string[];

}

interface Data {
  [color: KeysHex]: `#${string}` | string[];
  [alpha: `${string}Alpha`]: Alpha;
  welcome: IWelcome;
}

type DataResult = WithKey & Data

const Palette: DataResult = {
  primaryText: "#58585B",
  secondaryText: "#39393B",
  secondaryIcon: "#C8D1E8",
  tertiaryText: "#8F8E94",
  smallWidgetBackground: ["rgba(255,255,255,0.15)", "rgba(255,255,255,0)"],
  grayColorAlpha: (opacity: number) => `rgba(200, 209, 232, ${opacity})`,
  primaryTextAlpha: (opacity: number = 1) => `rgba(255, 255, 255, ${opacity})`,
  welcome: {
    primaryText: "#fff",
    primaryTextAlpha: (opacity: number = 1) => `rgba(255, 255, 255, ${opacity})`,
    secondaryText: "#C8D1E8",
    loaderColor: "#fff",
  },
  white: '#FFFFFF',
  darkGrayBlue: '#363C52',
};

操场

Answer 2

您可以删除特定的键：

export type AlphaColorProcessing = (opacity: number) => string;

export interface Styles {
  [key: string]: string | AlphaColorProcessing;
}