ERROR in ./src/polyfills.ts Module not found: Error: Can't resolve 'zone.js/dist/zone'

Issue

I have an angular 8, that uses karma/jasmine to run some unit tests. I can run tests by executing the following command ng test but I'm getting the following error:

ERROR in ./src/polyfills.ts Module not found: Error: Can't resolve 'zone.js/dist/zone' in 'C:\PrjNET\Elevation3\FW\4.00\Project\Framework\Development\Client\ElevationJS\shell\src' resolve 'zone.js/dist/zone' in 'C:\PrjNET\Elevation3\FW\4.00\Project\Framework\Development\Client\ElevationJS\shell\src'

Any one know how to solve it?

Solution

I found out that my test configurations on tsconfig.spec.json were wrong. So I change from this:

{
  "extends": "./tsconfig.es5.json",
  "compilerOptions": {
    "outDir": "../out-tsc/spec",
    "module": "commonjs",
    "target": "es6",
    "baseUrl": "",
    "types": [
      "jest",
      "node"
    ]
  },
  "files": [
    "test.ts",
    "polyfills.ts"
  ],
  "include": [
    "**/*.spec.ts",
    "**/*.d.ts"
  ]
}

to this:

{
  "extends": "./tsconfig.es5.json",
  "compilerOptions": {
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "outDir": "../out-tsc/spec",
    "module": "commonjs",
    "types": [
      "jasmine",
      "node"
    ]
  },
  "files": [
    "test.ts",
    "polyfills.ts"
  ],
  "include": [
    "**/*.spec.ts",
    "**/*.d.ts"
  ]
}

And the error disapeared!

Answered By - Ricardo Rocha