Disable browser tools with webpack build

[no-more]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [X] feature request

Command (mark with an x)

- [ ] new
- [X] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

node: v8.9.4
npm: 6.4.0

Angular CLI: 6.2.1
Node: 8.9.4
OS: win32 x64
Angular: 6.1.4
... animations, common, compiler, core, forms, http
... platform-browser, platform-browser-dynamic, platform-server
... router

Package Version

@angular-devkit/architect 0.8.0
@angular-devkit/build-angular 0.8.0
@angular-devkit/build-ng-packagr 0.8.0
@angular-devkit/build-optimizer 0.8.0
@angular-devkit/build-webpack 0.8.3
@angular-devkit/core 0.8.0
@angular-devkit/schematics 0.8.1
@angular/cdk 6.4.6
@angular/cli 6.2.1
@angular/compiler-cli 6.1.0
@angular/flex-layout 6.0.0-beta.17
@angular/language-service 6.1.0
@angular/material 6.4.6
@angular/material-moment-adapter 6.4.6
@ngtools/json-schema 1.1.0
@ngtools/webpack 6.2.0
@schematics/angular 0.8.1
@schematics/update 0.8.1
ng-packagr 4.1.0
rxjs 6.2.2
typescript 2.9.2
webpack 4.19.0

Repro steps

The log given by the failure

Desired functionality

I'm trying to build a monorepo which contains all the code for frontend(angular) and backend (node + typescript). I'm trying to switch from a all webpack build to a all angular-cli build (with "@angular-devkit/build-webpack:webpack" for backend builds)
But it seems even if using custom webpack config, the cli still applies some browser specific build step and I have the following errors:
Module not found: Error: Can't resolve 'utf-8-validate'
Module not found: Error: Can't resolve 'bufferutil'
It would be great to be able to completely disable this in order to make the build process platform independent.

Mention any other details that might be useful

[mgechev]

Hey @no-more, this is outside the scope of the CLI but I'd strongly encourage you to follow the architect API that we're working on #13463 as well as ngx-build-plus. Both provide extensibility points that you can use to introduce this extra piece of functionality.

[no-more]

Thanks, I'll keep an eye on this.

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