Node.js，TypeScript，打字：如何使用異步庫

Question

我正在嘗試在Typescript中使用異步庫； 我已經安裝了通過鍵入提供的定義文件，但是我不能使用AsyncFunction：

///<reference path='typings/index.d.ts' />
'use strict';

import async = require( 'async' );

let functions : AsyncFunction<any>[] = [];

如果我編譯此摘錄，則會出現此錯誤：

tsc test.ts --target es2015 --module system --removeComments --forceConsistentCasingInFileNames --noEmitOnError --noFallthroughCasesInSwitch --noImplicitAny --noImplicitReturns --noImplicitUseStrict --declaration --outfile a.js
test.ts(4,17): error TS2304: Cannot find name 'AsyncFunction'.

我使用的異步定義文件是這樣的： https : //raw.githubusercontent.com/types/npm-async/ff63908a70ec51b775d9a6b8afac9945b12fbe08/2/index.d.ts

我做錯了什么？

謝謝！

Answer 1

接口AsyncFunction不會從該文件導出。 唯一的出口是async的，你可以看到從export = async; 在最后一行。

固定

隨意復制interface AsyncFunction<T> { (callback: (err?: Error, result?: T) => void): void; } interface AsyncFunction<T> { (callback: (err?: Error, result?: T) => void): void; }到global.d.ts如果必須使用該注釋）。

Answer 2

在項目根文件夾上運行兩個命令

npm install async --save

npm我@ types / async --save

import * as async from 'async';

async.auto({
    get_data: function(callback:any) {
        console.log('in get_data');
        // async code to get some data
        callback(null, 'data', 'converted to array');
    },
    make_folder: function(callback:any) {
        console.log('in make_folder');
        // async code to create a directory to store a file in
        // this is run at the same time as getting the data
        callback(null, 'folder');
    },
    write_file: ['get_data', 'make_folder', function(results:any, callback:any) {
        console.log('in write_file', JSON.stringify(results));
        // once there is some data and the directory exists,
        // write the data to a file in the directory
        callback(null, 'filename');
    }],
    email_link: ['write_file', function(results:any, callback:any) {
        console.log('in email_link', JSON.stringify(results));
        // once the file is written let's email a link to it...
        // results.write_file contains the filename returned by write_file.
        callback(null, {'file':results.write_file, 'email':'user@example.com'});
    }]
  }, function(err:any, results:any) {
    console.log('err = ', err);
    console.log('results = ', results);
  });