Is Babel being used as compiler (AOT or JIT) in angular 5

Question

Do we need Babel in an Angular 5 application? What AOT or JIT is being used internally to compile?

Answer 1

You don't need to worry about babel in an angular 2+ application.

You configure the ECMAscript level in the tsconfig.app.json file in you project.

(be sure you initiated your project with angular's angular-cli)

example (angular 8):

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "types": []
  },
  "exclude": [
    "node_modules",
    "test.ts",
    "**/*.spec.ts"
  ]
}

example (angular 5) :

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "module": "es2015", //<-- can aslo be es5 es6 es7
    "types": []
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

typescript, angular's filesystem includes a very complete bundle of all the other goodies there exist in the JS biosphere :

• ECMAscript (ergo babel)
• coffeescript
• ...