打字稿:es6从node_modules子文件夹导入类型定义(.d.ts)

时间:2020-05-21 21:55:56

标签: javascript reactjs typescript ag-grid

我有一个npm软件包,该软件包具有以下类型定义(简化):

./ node_modules / ag-grid-react / main.d.ts

export declare class AgGridReact extends Component<AgGridReactProps, {}> {}

./ node_modules / ag-grid-react / lib / agGridReact.d.ts

export declare class AgGridReact extends Component<AgGridReactProps, {}> {
    gridOptions: GridOptions;
    api: GridApi | null;
    columnApi: ColumnApi;
}

我正在像这样在我的react组件中使用该组件:

import { AgGridReact } from 'ag-grid-react'

const HelpRequests= () => {
  const grid = useRef<AgGridReact>(null)

  if (grid.current) console.log(grid.current.columnApi)

  return (<AgGridReact ref={grid}/>)
}

问题:

Typescript确实抱怨没有columnApi。看来可悲的是从main.d.ts

中选择了错误的类型

我发现我可以直接从agGridReact.d.ts导入类型,并像这样使用它:

import {AgGridReact as AgGridReactType} from 'ag-grid-react/lib/agGridReact'

...

const grid = useRef<AgGridReactType>(null)

问题:

这是解决此问题的正确方法吗?打字稿是否足够聪明,不会导入 ./ node_modules / ag-grid-react / lib / agGridReact.ts 文件,这可能会导致我的包大小增加?

我进行了很多搜索,但找不到关于仅从node_modules子文件夹导入类型的任何信息。

1 个答案:

答案 0 :(得分:1)

我将尝试回答这个问题:

我们假设有一个xyz库,并且其中包含以下文件:

xyz / lib / main.ts:

export const test = 1000

xyz / main.ts:

export * from './lib/main.ts'
export const test = 'foo bar'

我想在我的 app.ts 中使用xyz,我只知道它的 main.ts 文件,从库中导出所有内容的主文件。所以我最有可能这样做:

app.ts:

import { test } from './xyz/main'

console.debug(test) // it will print 'foo bar'

现在,有人去评论库中的这一行:

xyz / main.ts:

export * from './lib/main.ts'
// export const test = 'foo bar'

现在,我的 app.ts 将打印什么?它将打印1000


ag-grid-react也在发生同样的事情。它( ag-grid-react / main.d.ts 覆盖 ag-grid-react / lib中似乎正确(更好)的类声明/agGridReact.d.ts 。从内部路径导入是完全可以的。

main.d.ts:

export * from './lib/agGridReact'; // it is exporting from innner path too
export declare class AgGridColumn extends Component<AgGridColumnProps | AgGridColumnGroupProps, {}> { // and overriding here at the same time
}

agGridReact.d.ts:

export declare class AgGridReact extends Component<AgGridReactProps, {}> {
    props: any;
    state: any;
    static propTypes: any;
    gridOptions: GridOptions;
    changeDetectionService: ChangeDetectionService;
    api: GridApi | null;
    columnApi: ColumnApi;
    portals: ReactPortal[];
    hasPendingPortalUpdate: boolean;
    destroyed: boolean;
    protected eGridDiv: HTMLElement;
    private static MAX_COMPONENT_CREATION_TIME;
    constructor(props: any, state: any);
    render(): React.ReactElement<any, string | ((props: any) => React.ReactElement<any, string | any | (new (props: any) => React.Component<any, any, any>)>) | (new (props: any) => React.Component<any, any, any>)>;
    createStyleForDiv(): any;
    componentDidMount(): void;
    waitForInstance(reactComponent: ReactComponent, resolve: (value: any) => void, runningTime?: number): void;
    mountReactPortal(portal: ReactPortal, reactComponent: ReactComponent, resolve: (value: any) => void): void;
    batchUpdate(callback?: any): any;
    destroyPortal(portal: ReactPortal): void;
    private getStrategyTypeForProp;
    shouldComponentUpdate(nextProps: any): boolean;
    componentDidUpdate(prevProps: any): void;
    processPropsChanges(prevProps: any, nextProps: any): void;
    private extractDeclarativeColDefChanges;
    private extractGridPropertyChanges;
    componentWillUnmount(): void;
    isDisableStaticMarkup(): boolean;
}

我无法确切地说出为什么ag-grid这样做。我发现这是在看打字文件。我也可能不正确。