TypeScript encountered an error (TS2403) stating that subsequent variable declarations must have matching types

Encountered an issue with my typings.d.ts file

Error TS2403: Subsequent variable declarations must have the same type. Variable 'module' is expected to be of type 'NodeModule', but is currently of type '{id:string}'.

declare var module: {
  id: string;
};

declare module '*';
declare module 'clappr';
declare module 'c3';
declare module 'd3';

Why did this happen? Any suggestions on how to resolve it?

Appreciate any feedback, thank you!

Answer №1

Once upon a time...

While updating an Angular application, I encountered an error while running ng serve:

"ERROR in node_modules/@types/node/index.d.ts(117,13): error TS2403: Subsequent variable declarations must have the same type. Variable 'module' must be of type '{ id: string; }', but here has type 'NodeModule'"

To resolve this issue, I navigated to node_modules/@types/node/index.d.ts(117,13) and made the following MANUAL change:

//declare var module: NodeModule;    <---- old text
declare var module: { id: string; };   <--- new text

After making this adjustment, the code compiled successfully. Now, it's time to test the application...

Running ng -v:

Angular CLI: 6.0.8
Node: 8.11.3
OS: darwin x64
Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.6.8
@angular-devkit/core         0.6.8
@angular-devkit/schematics   0.6.8
@schematics/angular          0.6.8
@schematics/update           0.6.8
rxjs                         6.2.1
typescript                   2.7.2

Reviewing the package.json file:

{
  "name": "client",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.5",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.0.0",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.0.0",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/router": "^5.0.0",
    "@ng-bootstrap/ng-bootstrap": "^1.1.2",
    "@ngui/map": "^0.18.6",
    "bootstrap": "^3.3.7",
    "core-js": "^2.5.7",
    "ng2-file-upload": "^1.3.0",
    "rxjs": "^5.5.12",
    "rxjs-compat": "^6.3.2",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.8.0",
    "@angular/cli": "^6.2.3",
    "@angular/compiler-cli": "^5.0.0",
    "@types/googlemaps": "^3.30.13",
    "@types/jasmine": "2.5.38",
    "@types/node": "^6.0.117",
    "codelyzer": "^4.0.1",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "^3.0.0",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "^1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "^5.4.1",
    "ts-node": "~2.0.0",
    "tslint": "^5.0.0",
    "typescript": "^2.9.2"
  }
}

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