TypeScript 版本： 3.8 & Nightly
搜索词：

• Omit
• Record
• Any
• 丢失类型信息
  预期行为：

我希望以下类型按照内联注解描述。

type AnyRecord = Record<string, any>;
interface ExtendsAny extends AnyRecord {
   myKey1: string;
   myKey2: string;
}
// ExtendsAny['myKey1'] === string
// ExtendsAny['otherKey'] === any

type OmitsKey = Omit<ExtendsAny, "myKey2">;
// OmitsKey['myKey'] === string
// OmitsKey['otherKey'] === any

请注意，在不使用 omit 或不使用 record 的情况下，这可以正常工作，但当两者一起使用时，实际行为如下。
在使用 omit 之后，所有键都变成了 "any",即使特定定义的键存在，用于代码补全等的任何信息也会被删除，尽管它们在原始扩展中可以正常工作。

type AnyRecord = Record<string, any>;
interface ExtendsAny extends AnyRecord {
   myKey1: string;
   myKey2: string;
}
// ExtendsAny['myKey1'] === string
// ExtendsAny['otherKey'] === any

type OmitsKey = Omit<ExtendsAny, "myKey2">;
// 🚨Problem here 🚨
// OmitsKey['myKey1'] === any
// OmitsKey['otherKey'] === any

const instance: OmitsKey = {
    myKey1: "test",
}
// 🚨 When typing this no autocomplete is provided for myKey1 🚨
instance.myKey1.

相关问题：

• Incorrect error when assigning to omitted and extended record type #27883
  潜在解决方案

在此期间，我正在重新定义基本接口(非常大),因为它来自一个没有混合记录类型的库。我先执行 omit,然后再将其添加回来。

代码

/**
* @copyright 2020 Adam (charrondev) Charron
* @license MIT
*/

export interface IBase<T = number> {
    baseProp: T;
    baseProp2: T;
    baseFunction: () => T;
}

const base: IBase<number> = {
    baseProp: 0,
    baseProp2: 0,
    baseFunction: () => 0,
};

// number
base.baseProp;

///
/// Without the omit
///
type AnyRecord = Record<string, any>;

interface IExtend<T> extends IBase<T>, AnyRecord {
    extendProp: T;
}

const extended: IExtend<number> = {
    baseProp: 0,
    baseProp2: 0,
    baseFunction: () => 0,
    extendProp: 0,
};

// number
extended.baseProp2;

///
/// With an Omit
///
interface IOmittedInterface extends Omit<IExtend<number>, "baseProp"> {}

const omitted: IOmittedInterface = {
    baseProp2: 0,
    baseFunction: () => 0,
};

// any
omitted.baseProp2;

输出

/**
* @copyright 2020 Adam (charrondev) Charron
* @license MIT
*/
const base = {
    baseProp: 0,
    baseProp2: 0,
    baseFunction: () => 0,
};
// number
base.baseProp;
const extended = {
    baseProp: 0,
    baseProp2: 0,
    baseFunction: () => 0,
    extendProp: 0,
};
// number
extended.baseProp2;
const omitted = {
    baseProp2: 0,
    baseFunction: () => 0,
};
// any
omitted.baseProp2;

编译器选项

{
  "compilerOptions": {
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "strictBindCallApply": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "useDefineForClassFields": false,
    "alwaysStrict": true,
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "downlevelIteration": false,
    "noEmitHelpers": false,
    "noLib": false,
    "noStrictGenericChecks": false,
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "esModuleInterop": true,
    "preserveConstEnums": false,
    "removeComments": false,
    "skipLibCheck": false,
    "checkJs": false,
    "allowJs": false,
    "declaration": true,
    "experimentalDecorators": false,
    "emitDecoratorMetadata": false,
    "target": "ES2017",
    "module": "ESNext"
  }
}

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