error TS5023: Unknown compiler option 'enableIvy'

Question

I am trying to add IVY to my angular 7 beta project. So, I added enableIvy: true to src/tsconfig.app.json in compilerOptions section

But when I run ng build --prod --aot --output-hashing none I get below error.

error TS5023: Unknown compiler option 'enableIvy'.

Error: error TS5023: Unknown compiler option 'enableIvy'.

    at AngularCompilerPlugin._setupOptions (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:112:19)
    at new AngularCompilerPlugin (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:61:14)
    at _createAotPlugin (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/typescript.js:41:12)
    at Object.getAotConfig (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/typescript.js:63:19)
    at BrowserBuilder.buildWebpackConfig (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/src/browser/index.js:81:37)
    at MergeMapSubscriber.rxjs_1.of.pipe.operators_1.concatMap [as project] (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/src/browser/index.js:31:38)
    at MergeMapSubscriber._tryNext (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/operators/mergeMap.js:65:27)
    at MergeMapSubscriber._next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/operators/mergeMap.js:55:18)
    at MergeMapSubscriber.Subscriber.next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/Subscriber.js:64:18)
    at TapSubscriber._next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/operators/tap.js:62:26)
    at TapSubscriber.Subscriber.next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/Subscriber.js:64:18)
    at MergeMapSubscriber.notifyNext (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/operators/mergeMap.js:84:26)
    at InnerSubscriber._next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/InnerSubscriber.js:25:21)
    at InnerSubscriber.Subscriber.next (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/Subscriber.js:64:18)
    at ForkJoinSubscriber.notifyComplete (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/observable/forkJoin.js:79:25)
    at InnerSubscriber._complete (/Users/k26686/aniruddh/develop/experiment/shepherd/node_modules/@angular-devkit/build-angular/node_modules/rxjs/internal/InnerSubscriber.js:32:21)

Any one resolved this.

Answer 1

try to include enableIvy option under angularCompilerOptions

"angularCompilerOptions": {
   "enableIvy": true
}

Answer 2

compilerOptions and angularCompilerOptions are two separate properties in tsconfig.json. You need to add "enableIvy": true to angularCompilerOptions and not compilerOptions:

tsconfig.json:

{
  "compilerOptions": {
  ....
  },
  "angularCompilerOptions": {
    "enableIvy": true
  }
}

Answer 3

Now the right way is set

"angularCompilerOptions": {
   "enableIvy": "ngtsc"
}

this is related to the issue #23455

This commit adds a new compiler pipeline that isn't dependent on global analysis, referred to as 'ngtsc'. This new compiler is accessed by running ngc with "enableIvy" set to "ngtsc". It reuses the same initialization logic but creates a new implementation of Program which does not perform the global-level analysis that AngularCompilerProgram does. It will be the foundation for the production Ivy compiler.