Platform-browser package incorrectly contains transpiled files misrepresented as ES6

[mattmutt]

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[ ] feature request
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Current behavior
When checking out an Angular 4.0.0-rc.1 new project with all Angular assets pulled in with that exact version, the platform-browser contains a folder that eventually contain animation and testing.

that folder's relative path would be
@angular\platform-browser\@angular\platform-browser\animations

There are ES5 builds of for animations and testing. The problem is that the .es5.js files are incorrect. How can ES5 use the class keyword?

Expected behavior
The files must be ES5 compliant. That means transpile to functions.

Minimal reproduction of the problem with instructions

npm i @angular/animations@4.0.0-rc.1 zone.js rxjs @angular/core@4.0.0-rc.1 @angular/platform-browser@4.0.0-rc.1 @angular/common@4.0.0-rc.1

then change directory into
node_modules\@angular\platform-browser\@angular\platform-browser

Examine the alleged ES5 files animations.es5.js and testing.es5.js. Judge if the syntax complies with the older JS version.

What is the motivation / use case for changing the behavior?

Please tell us about your environment:

• Angular version: [4.0.0-rc.1]

latest version of 4

• Browser: [IE11 ]

Mainly affects old school IE

• Language: [ES5]

• Node (for AoT issues): node --version =

[ericmartinezr]

#14730

[mattmutt]

thanks will monitor that related defect

[DzmitryShylovich]

@mattmutt fixed by #14820

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