ng build - ES5 bundles -> Unknown helper createSuper

[PeS82]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 9.0.6

Description

Any ng build ends up with An unhandled exception occurred: C:\my\path\main-es2015.js: Unknown helper createSuper

🔬 Minimal Reproduction

ng build or ng build--prod

🔥 Exception or Error

Generating ES5 bundles for differential loading...
An unhandled exception occurred: C:\my\path\main-es2015.js: Unknown helper createSuper
See "C:\Users\Me\AppData\Local\Temp\ng-sYZMmM\angular-errors.log" for further details.

and the angular-errors.log:

[error] ReferenceError: C:\my\path\main-es2015.js: Unknown helper createSuper
    at loadHelper (C:\my\path\node_modules\@babel\helpers\lib\index.js:225:27)
    at Object.ensure (C:\my\path\node_modules\@babel\helpers\lib\index.js:270:3)
    at File.addHelper (C:\my\path\node_modules\@babel\core\lib\transformation\file\file.js:203:15)
    at pushInheritsToBody (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:471:384)
    at pushConstructorToBody (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:461:5)
    at pushConstructor (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:449:5)
    at pushBody (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:187:11)
    at buildBody (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:133:5)
    at classTransformer (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:537:5)
    at transformClass (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\transformClass.js:573:10)
    at PluginPass.ClassExpression (C:\my\path\node_modules\@babel\plugin-transform-classes\lib\index.js:63:54)
    at newFn (C:\my\path\node_modules\@babel\traverse\lib\visitors.js:179:21)
    at NodePath._call (C:\my\path\node_modules\@babel\traverse\lib\path\context.js:55:20)
    at NodePath.call (C:\my\path\node_modules\@babel\traverse\lib\path\context.js:42:17)
    at NodePath.visit (C:\my\path\node_modules\@babel\traverse\lib\path\context.js:90:31)
    at TraversalContext.visitQueue (C:\my\path\node_modules\@babel\traverse\lib\context.js:112:16)

🌍 Your Environment

Angular CLI: 9.0.7
Node: 12.3.1
OS: win32 x64

Angular: 9.0.7
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.900.7
@angular-devkit/build-angular     0.900.7
@angular-devkit/build-optimizer   0.900.7
@angular-devkit/build-webpack     0.900.7
@angular-devkit/core              9.0.7
@angular-devkit/schematics        9.0.7
@angular/cdk                      9.1.3
@angular/flex-layout              9.0.0-beta.29
@angular/material                 9.1.3
@ngtools/webpack                  9.0.7
@schematics/angular               9.0.7
@schematics/update                0.900.7
rxjs                              6.5.4
typescript                        3.7.5
webpack                           4.41.2

Anything else relevant?

Tried to install @babel/compat-data (mentioned here) as it seems babel related , did not help

EDIT:

Downgrading to

    "@angular-devkit/build-angular": "^0.900.6",
    "@angular/cli": "^9.0.6",
    "@angular/compiler-cli": "^9.0.6",

which returned the environment to:

Angular CLI: 9.0.6
Node: 12.3.1
OS: win32 x64

Angular: 9.0.7
... animations, common, compiler, core, forms, language-service
... localize, platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.900.6
@angular-devkit/build-angular     0.900.6
@angular-devkit/build-optimizer   0.900.6
@angular-devkit/build-webpack     0.900.6
@angular-devkit/core              9.0.6
@angular-devkit/schematics        9.0.6
@angular/cdk                      9.1.3
@angular/cli                      9.0.6
@angular/compiler-cli             9.0.6
@angular/flex-layout              9.0.0-beta.29
@angular/material                 9.1.3
@ngtools/webpack                  9.0.6
@schematics/angular               9.0.6
@schematics/update                0.900.6
rxjs                              6.5.4
typescript                        3.7.5
webpack                           4.41.2

returned the functionality of ng build back.

[alan-agius4]

Related to babel/babel#11298

[alan-agius4]

Closed via #17280

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