The TypeScript Declaration File is not being recognized even though its directory is specified in the typeRoots configuration

I'm currently facing an issue in my typescript (Angular 9) project where I am trying to import a private JavaScript library.

Upon importing it using

import { myMethod } from 'my-private-repo/dist/util';
, I encounter the following error :

Could not find a declaration file for module 'my-private-repo/dist@types/util'. 'my-private-repo/dist/util.js' implicitly has an 'any' type. Try `npm install @types/my-private-repo` if it exists or add a new declaration (.d.ts) file containing `declare module 'my-private-repo/dist/util';`

To address this issue, I attempted to create a declaration file in a folder named typings with the content:

declare module "my-private-repo/dist/util";
, or even with declare module "*";. However, the error persists as if my declaration file is not being recognized at all, despite modifying my tsconfig to include it:

{
  ...
  "compilerOptions": {
    ...
    "noImplicitAny": true,
    ...
    "typeRoots": [
      "./typings",
      "./node_modules/@types"
    ]
  }
}

I'm puzzled as to why my declaration file is not being acknowledged. Any insights on how to resolve this would be greatly appreciated!

Thank you :)

Answer №1

To include a declaration file, you must place it in one of the following directories:

  1. 'my-personal-repository/dist/util.d.ts'

  2. 'my-personal-repository/dist/package.json'
    (and remember to specify a "types" property)

  3. 'my-personal-repository/dist/@types/util.d.ts'

Learn more about how TypeScript loads modules here: https://www.typescriptlang.org/docs/handbook/module-resolution.html

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