[Fixed] Angular 11 – ng serve – Option "sourceMap" is deprecated


I updated Angular project from Angular 10 to 11x. Everything works normally, except for one warning on running project using ng serve (without any option in ng serve). The warning is:

Option "sourceMap" is deprecated: Use the "sourceMap" option in the browser builder instead.

The warning is not presented in ng build.

Here is how browser builder part in angular.json of the project looks like:

"builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/my-app",
            "index": "src/index.html",
            "sourceMap": true,
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": true,
            "assets": [

Something related has changed in Angular 11? How to remove this warning?


You need to remove sourceMap from serve --> options --> sourceMap, which is deprecated.

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