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如何声明this.someProperty以响应typeScript?

typescript reactjs

shaan · 技术社区 · 5 年前

嗨,我要 TS2339: Property 'someProperty ' does not exist on type ''. 我正在尝试向react组件添加新属性 this.someProperty

    interfaceMyComponentState {
        allClear: boolean;
        data: Array<object>;
    }

    interface MyComponentProps {}

    class MyComponent extends React.Component<MyComponentProps, MyComponentState> {

        constructor(props) {

            super(props);
            this.state = {
                allClear: false,
                data: []
            };
            this.someProperty = []; // this is not a prop nor a state
        }


    }

这个。某物 这样我就不会得到typecript错误。

2 回复 | 直到 5 年前

Madara's Ghost 5 年前

必须首先将其定义为类属性。

class MyComponent extends ... {
  // string[] so that TypeScript doesn't automatically infer never[] or any[].
  // change string[] to whatever your actual type for someProperty is.
  private someProperty: string[] = [];
  public state = { allClear: false, data: [] };

  // no need for the constructor if all you do is set properties/state
}