TypeScript：如何将类型声明绑定到import语句

Question

I'm trying to create a type definition for es6-promisify , a JS package not in the DefinitelyTyped annotations repository. Looking at examples in DefinitelyTyped and following TS Deep Dive / Declaration Files , I created a crude annotation that I saved in my project in a vendor.d.ts :

declare function promisify(original: (...args: any[]) => any, settings: any): Promise<any>

export = promisify
// export interface promisify { } // or should I do an interface?

Now, considering I import with import promisify = require('es6-promisify') , how do I tell TypeScript that the promisify import is annotated in vendor.d.ts ? Currently, tsc keeps returning Could not find a declaration file for module 'es6-promisify'. 'promisify.js' implicitly has an 'any' type. Could not find a declaration file for module 'es6-promisify'. 'promisify.js' implicitly has an 'any' type. I'm trying to digest TS Docs / Module Resolution but am failing at it so far.

Phrased differently: what's the mechanism used by TypeScript to resolve a declaration file from an import? XY problem warning: maybe I'm doing things wrong and shouldn't do a vendor.d.ts ? Maybe there's a good reason es6-promisify is not in DT? Feel free to contradict with better ways to reach my goal of making tsc with "noImplicitAny": true happy. Thanks :)

Answer 1

The following works for me.

es6-promisifiy.d.ts :

declare module "es6-promisify" {
  export default function promisify(original: (...args: any[]) => any, settings: any): Promise<any>
}

usage:

import promisify from "es6-promisify";
...
const xyz = promisify(whatever, whatever);

tsconfig.json:

{
    "compilerOptions": {
        ...
        "typeRoots": [
            "./node_modules/@types",
            "./custom_typings"
        ]
    },
    ...
}

Hope this helps.