ERROR node_modules/@types/node/globals.d.ts(196,5) errorTS2300: Duplicate identifier 'resolve' src/typings.d.ts(12,3) Duplicate identifier 'resolve'

Question

Getting following error after updating app from Angular 5 to 7, using ng update --all --force to update all the dependencies.

ERROR in node_modules/@types/node/globals.d.ts(196,5): error TS2300: Duplicate identifier 'resolve'. src/typings.d.ts(12,3): error TS2300: Duplicate identifier 'resolve'.

Tried adding this to tsconfig.json file:

"exclude": [
      "node_modules",
      "typings/main",
      "typings/main.d.ts",
      "typings/index.d.ts",
      "node_modules/@types/node/globals.d.ts"
    ]

and this to package.json: "postinstall": "shx rm -rf node_modules/@types/node && echo 'workaround for libs importing @types/node on browser environment'"

then deleted node modules and did fresh install. Nothing has helped.

this is from node_modules/@types/node/globals.d.ts

interface NodeRequireFunction {
    /* tslint:disable-next-line:callable-types */
    (id: string): any;
}

interface NodeRequire extends NodeRequireFunction {
    resolve: RequireResolve; <- duplicate resolve
    cache: any;
    /**
     * @deprecated
     */
    extensions: NodeExtensions;
    main: NodeModule | undefined;
}

interface RequireResolve {
    (id: string, options?: { paths?: string[]; }): string;
    paths(request: string): string[] | null;
}

interface NodeExtensions {
    '.js': (m: NodeModule, filename: string) => any;
    '.json': (m: NodeModule, filename: string) => any;
    '.node': (m: NodeModule, filename: string) => any;
    [ext: string]: (m: NodeModule, filename: string) => any;
}

declare var require: NodeRequire;

and this is from typings.d.ts:

declare var module: NodeModule;
interface NodeModule {
  id: string;
}
declare var CSSstring: string;
interface NodeRequire {
  cache: any;
  extensions: NodeExtensions;
  main: NodeModule;
  (id: string): any;
  resolve(id: string): string;    <- duplicate resolve
}

declare var require: NodeRequire;
declare module '*.json' {
    const value: any;
    export default value;
}

Answer 1

This is happening because two Node modules define "resolve".

You can fix this by doing this:

tsconfig.app.json

{
  "compilerOptions": {
    types: [] // you can list the types you want to use here
  } 
}

You probably want to do the same to tsconfig.spec.json if you are unit testing.

Answer 2

I was receiving a similar error message. I have fixed installing typescript in my project:

npm i -D typescript

Typescript was installed globally with a previous version not corresponding with @types/node library version in the project