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Accepted
13reath
Asked: 2023-08-17 18:44:21 +0800 CST

“没有重载匹配”我的 Object.assign() 调用；我该如何修复它？

  • 772
export class Attributes<T> {
    constructor(private data: T) {}

    get<K extends keyof T>(key: K): T[K] {
        return this.data[key];
    }

    set(update: T): void {
        Object.assign(this.data, update);
    }
}

错误的屏幕截图 错误

和文字版本

No overload matches this call.
  Overload 1 of 4, '(target: {}, source: T): {} & T', gave the following error.
    Argument of type 'T' is not assignable to parameter of type '{}'.
  Overload 2 of 4, '(target: object, ...sources: any[]): any', gave the following error.
    Argument of type 'T' is not assignable to parameter of type 'object'.ts(2769)
Attributes.ts(1, 25): This type parameter might need an `extends {}` constraint.
Attributes.ts(1, 25): This type parameter might need an `extends object` constraint.
typescript

1 个回答

  1. Best Answer

    正如错误所说：

    number.ts(1, 25): This type parameter might need an `extends object` constraint.

    所以你应该限制T扩展object，这意味着它不是一个原语：

    class Attributes<T extends object> {
  constructor(private data: T) {}

  get<K extends keyof T>(key: K): T[K] {
    return this.data[key];
  }

  set(update: T): void {
    Object.assign(this.data, update); // no error
  }
}
    • 2

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