The search for d.ts declaration files in the project by 'typeRoots' fails

// Within tsconfig.json under "compilerOptions"
    "typeRoots": ["./@types", "./node_modules/@types"],

// Define custom types for Express Request in {projectRoot}/@types/express/index.d.ts
declare global {
  namespace Express {
    interface Request {
      verifiedAccessToken: string
    }
  }
}

Even after annotating req as Express Request in a different file's function parameter, setting verifiedAccessToken causes a linting error in VsCode:

req.verifiedAccessToken = accessToken;
// Property 'verifiedAccessToken' does not exist on 
// type 'Request<ParamsDictionary, any, any, ParsedQs>'.ts(2339)

Any additional steps required to use the declaration file?

// Check package.json for relevant dependencies
 "dependencies": {
    "express": "^4.17.1",
    "node-typescript": "^0.1.3",
    "ts-node": "^9.0.0",
    "typescript": "^3.9.7"
  },
  "devDependencies": {
    "@types/express": "^4.17.8",
    "@types/node": "^14.0.27",
typescript

Answer №1

One potential solution is to include the following snippet in your tsconfig.json:

{
    "compilerOptions": {
        "baseUrl": "./",
        "paths": {
            "*" : ["@types/*"]
        }
    }
}`

For more information, you can refer to this link: https://github.com/microsoft/TypeScript/issues/22217

Answer №2

After exploring the link provided in the recommended answer, I encountered persistent issues. To assist future searchers, here is my solution (copied from my comment on the Github problem):

The insight shared by @gaurav5430 in this comment set me on the correct path!

Here was my original folder structure:

@types/
 index.d.ts
src/
 index.ts
package.json
tsconfig.json

This is what my tsconfig.json looked like:

{
  "compilerOptions": {
    "baseUrl": "./",
    "declaration": true,
    "esModuleInterop": true,
    "module": "commonjs",
    "outDir": "dist",
    "paths": {
      "*": [
        "@types/*"
      ]
    },
    "skipLibCheck": true,
    "sourceMap": true,
    "strict": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types",
      "@types"
    ],
  },
  "include": [
    "src/**/*"
  ]
}

Even after these adjustments, I continued to encounter errors without a clear explanation. It eventually dawned on me that @types/index.d.ts needed to be renamed according to the module lacking types. Therefore, I had to change: @types/index.d.ts to @types/csv-to-js-parser.d.ts.

(The content of the file should be: 

declare module "csv-to-js-parser";
)

AT LAST

This issue proved to be quite frustrating.

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