migration from LESS2 (ng1) to LESS3 (ng6) allow to use option javascriptEnabled

[WuglyakBolgoink]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting

Area

- [x] devkit

can we merge this PR?
https://github.com/angular/devkit/pull/866/files

I try to migrate from ng1 to ng6. In our less files there are many mixins.
now I got error like:

ERROR in ./src/styles/main.less (./node_modules/raw-loader!./node_modules/postcss-loader/lib??embedded!./node_modules/less-loader/dist/cjs.js??ref--15-3!./src/styles/main.less)
Module build failed: 


    .transitionExt(top ease 250ms);
  ^
Inline JavaScript is not enabled. Is it set in your options?
      in /Users/dev/app/src/styles/core/base.less (line 239, column 4)

als temporary solution for back-compatibility is adding "javascriptEnabled:true" to less compiler.

is it possible to add in angular.json or package.json this option?

[clydin]

Duplicate of #10430

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