string.split ie unexpected result

[TurnsOut]

🐞 Bug report

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Is this a regression?

This used to work in angular8.

Description

"tick".split(/^|\s+/) 

yields different results in chrome and ie.

I would expect results to be the same in chrome and ie.

🔬 Minimal Reproduction

• ng new angular9stringSplit (routing yes, stylesheet scss)
• change "target" from "es2015" to "es5" in tsconfig.json
• add constructor to app.component.ts with "console.log('tick'.split(/^|\s+/));"
• serve
• compare output in ie (["t","i","c","k"]) with chrome (["tick"])

🔥 Exception or Error

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / ? \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 9.0.1
Node: 12.3.1
OS: win32 x64

Angular:
...
Ivy Workspace:

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.900.1
@angular-devkit/core         9.0.1
@angular-devkit/schematics   9.0.1
@schematics/angular          9.0.1
@schematics/update           0.900.1
rxjs                         6.5.3

edit 24/02/2020:
updated to

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / ? \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 9.0.3
Node: 12.3.1
OS: win32 x64

Angular:
...
Ivy Workspace:

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.900.3
@angular-devkit/core         9.0.3
@angular-devkit/schematics   9.0.3
@schematics/angular          9.0.3
@schematics/update           0.900.3
rxjs                         6.5.3

Anything else relevant?

When debugging i see that polyfill https://github.com/zloirock/core-js/blob/master/packages/core-js/modules/es.string.split.js is already in use. Adding it again in polyfills.ts doesn't make a difference.

Unrelated: I'm migrating an angular8 app with d3 to angular9, d3 depends on this for registering callbacks. https://github.com/d3/d3-selection/blob/master/src/selection/on.js#L35

[alan-agius4]

This seems to be a regression from core-js. Here’s an open issue zloirock/core-js#751

[PetarMetodiev]

The issue seems to have been fixed - zloirock/core-js#741 (comment)

[TurnsOut]

Cannot confirm that this is fixed.

Updated angular-cli to 9.0.3

Repro mentioned above still creates a project with the issue. Specifically installing core-js@3.6.4 and including in polyfill does not change behaviour.

[jpzwarte]

@TurnsOut afaics @angular-devkit/build-angular uses core-js@3.6.0 (see node_modules/@angular-devkit/build-angular/node_modules/core-js/package.json) even though i have core-js@3.6.4 in my app's package.json.

@alan-agius4 any chance we can try a new version of the cli with core-js > 3.6.0 to see if that fixes this problem?

[jpzwarte]

I can verify this on angular.io btw:

• Go to angular.io in IE11
• Open devtools console
• Run "tick".split(/^|\s+/)