Angular-cli: How can remove some lines before build

[kishanmundha]

Bug Report or Feature Request (mark with an x)

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- [x] feature request

Versions.

@angular/cli: 1.1.3
node: 7.10.0

How can remove some lines before build

I'm putting logs in my code for debugging and logging. These logs are putted in every file, every function. I can simple build my app by ng build or ng build --prod. Problem is if I remove all logs from my app dist folder size can be decrease. I don't want to remove logs for debug environment, but I wan't to remove all logs file before build it.

I search about this problem, but I i did't get any proper solution.

How can I achieve this.

[devoto13]

Maybe Angular itself will support it one day. See Igor's review for https://github.com/angular/angular/pull/17399.

[tmakin]

Whilst researching this issue I found the drop_console option in uglify js. I don't know how well it work, but it could be a super easy way to implement this.
https://github.com/mishoo/UglifyJS2/blob/v2.x/README.md

I guess it would need to be passed into the webpack production config here:
https://github.com/angular/angular-cli/blob/67646796d977bd476c3f618dd64a6c2b6c4ddcae/packages/%40angular/cli/models/webpack-configs/production.ts#L89

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