Could not find a declaration file for module 'module-name'. '/path/to/module-name.js' implicitly has an 'any' type

I read how TypeScript module resolution works.

I have the following repository: @ts-stack/di. After compiling the directory structure is as follows:

├── dist
│   ├── annotations.d.ts
│   ├── annotations.js
│   ├── index.d.ts
│   ├── index.js
│   ├── injector.d.ts
│   ├── injector.js
│   ├── profiler.d.ts
│   ├── profiler.js
│   ├── providers.d.ts
│   ├── providers.js
│   ├── util.d.ts
│   └── util.js
├── LICENSE
├── package.json
├── README.md
├── src
│   ├── annotations.ts
│   ├── index.ts
│   ├── injector.ts
│   ├── profiler.ts
│   ├── providers.ts
│   └── util.ts
└── tsconfig.json

In my package.json I wrote "main": "dist/index.js".

In Node.js everything works fine, but TypeScript:

import {Injector} from '@ts-stack/di';

Could not find a declaration file for module '@ts-stack/di'. '/path/to/node_modules/@ts-stack/di/dist/index.js' implicitly has an 'any' type.

And yet, if I import as follows, then everything works:

import {Injector} from '/path/to/node_modules/@ts-stack/di/dist/index.js';

What am I doing wrong?

For the situation where you are installing your own npm package

If you're using a third party package, see my answer below.

Remove .js from "main": "dist/index.js" in package.json.

"main": "dist/index",

Also add types in package.json per the TypeScript docs:

"main": "dist/index",
"types": "dist/index",

The folder dist is where the TS compiler stores your module's files.