Problem: Unable to locate the TypeScript declaration file

I am facing an issue with my TypeScript configuration. I have two files in /src/models/: User.ts and User.d.ts. In User.ts, I am building a class and trying to use an interface declaration for an object defined in User.d.ts. However, User.ts is unable to automatically recognize the interface from User.d.ts. I thought TypeScript parses all .d.ts files by default, so I'm confused about why it's not working. Do I need to update my config settings or am I missing something in my understanding?

The error message I receive pertains to the User.d.ts file:

Parsing error: "parserOptions.project" has been set for @typescript-eslint/parser.
The file does not match your project config: src/models/User.d.ts.
The file must be included in at least one of the projects provided

Within User.ts:

class User {
  private id: number;

  constructor(id: number) {
    this.id = id;
  }

  static create(userData: UserData): User | undefined {
    return undefined;
  }

  getId(): number {
    return this.id;
  }
}

export default User;

In UserData.d.ts:

interface UserData {
  id?: number;
  gmail?: string;
  firstName?: string;
  lastName?: string;
  loginIP?: string;
  secureKey?: string;
  imgFileName?: string;
  lastUpdate?: string;
  createDate?: string;
}

I am struggling to make User.ts recognize UserData. Here are excerpts from my tsconfig.json:

{
  "compilerOptions": {
    "module": "commonjs",
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "target": "es6",
    "noImplicitAny": true,
    "moduleResolution": "node",
    "sourceMap": true
  },
  "include": ["/src/**/*.ts", "**/src/**/*.ts", "**/__tests__/**/*.ts"]
}

And from my .eslintrc.js file:

module.exports = {
  extends: ['airbnb', 'plugin:@typescript-eslint/recommended'],
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint', 'prettier'],
  settings: {
    'import/parsers': {
      '@typescript-eslint/parser': ['.ts', '.tsx'],
    },
    'import/resolver': {
      typescript: {},
    },
  },
  rules: {
    'import/no-extraneous-dependencies': [2, { devDependencies: ['**/*.test.tsx', '**/*.test.ts'] }],
    '@typescript-eslint/indent': [2, 2],
    'import/extensions': [
      'error',
      'ignorePackages',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never',
        mjs: 'never',
      },
    ],
  },
};

I would greatly appreciate any assistance in figuring out where I am going wrong. Thank you.

Answer №1

Summary

To simplify, adjust the typeRoots configuration in your tsconfig.json

Solution 1

In my opinion, utilizing the typeRoots feature in the tsconfig.json file would be beneficial. Here is an example of how to set it up:

"compilerOptions": {
    ...
    "typeRoots" : ["./typings"]
    ...
 },

Solution 2

Consider modifying the include options with "/src/**/*.d.ts"

"include": ["/src/**/*.ts", "**/src/**/*.ts", "**/__tests__/**/*.ts",  "/src/**/*.d.ts"]

Additional Resources

  1. Typescript Handbook

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