I'm trying to use the async library in Typescript; I've installed the definition file that was provide by typings but I cannot use AsyncFunction:
///<reference path='typings/index.d.ts' />
'use strict';
import async = require( 'async' );
let functions : AsyncFunction<any>[] = [];
If I compile this extract I got this error:
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'.
The async definition file that I use is this: https://raw.githubusercontent.com/types/npm-async/ff63908a70ec51b775d9a6b8afac9945b12fbe08/2/index.d.ts
What I'm doing wrong?
Thank you!
The interface AsyncFunction
is not exported from that file. The only export is async
as you can see from export = async;
on the last line.
Feel free to copy interface AsyncFunction<T> { (callback: (err?: Error, result?: T) => void): void; }
interface AsyncFunction<T> { (callback: (err?: Error, result?: T) => void): void; }
to a global.d.ts
if you must use that annotation.
Run Two commends on project root folder
npm install async --save
npm i @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);
});
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