Ionic cordova build Get Stuck at "Generating ES5 bundles for differential loading..."

Ionic Framework
4

Same issue here. Running the cordova build command with --verbose, I get this error message:

[error] Error: Call retries were exceeded
    at ChildProcessWorker.initialize (/Users/me/Documents/apps/myapp/node_modules/jest-worker/build/workers/ChildProcessWorker.js:193:21)
    at ChildProcessWorker.onExit (/Users/me/Documents/apps/myapp/node_modules/jest-worker/build/workers/ChildProcessWorker.js:263:12)
    at ChildProcess.emit (events.js:198:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)

It seems to be connected with this issue:

But I still can’t manage to get it solved.

Edit: Error occurs on one of my projects only. For all others I can build without any problems. Could there be a performance issue with cordova/Ionic? My machine (MBP, 2,7 GHz i7, 16 GB RAM) should be able to build my projects I guess…

EDIT2 / Temporary solution:
There was a change in @angular-devkit/build-angular which updated the differential loading. To fix this in your Ionic project, change the target value from “es2015” to “es5” in your tsconfig.json:

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "esnext",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "importHelpers": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}

Let’s hope there’s a real fix for that soon but in the meantime we at least can build our projects.

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