feat(build): add sourcemap option

[filipesilva]

Add --no-sourcemap option to ng build/serve/test.

Disabling sourcemaps can help with build speeds. My tests on a medium project show a 11.5% improvement on initial builds, and a 37% improvement on rebuilds.

Disabling sourcemaps will make debugging harder, since it makes line information very innacurate.

Partially address #1980

[hansl]

LGTM but travis failing.

[hansl]

Revert this empty line, please.

[filipesilva]

Done

[naveedahmed1]

Should disabling sourcemaps also reduce the bundle size? I am using lazy loading and with --prod and --aot options the total size of all bundles is ~14mb with one of the bundles (0.xxxxxxxx.bundle.js) having size of ~8mb. The build process takes 20 minutes.

[naveedahmed1]

@filipesilva I just tried no-sourcemap using below command ng build --aot --prod --no-sourcemap, the total bundles size which was 14mb with previous version, is now 38.3 mb though the build which previousl took 20 minutes is now very quick.

[grizzm0]

@filipesilva Isn't sourcemap only used for dev/debug purposes?

My main.bundle.js.gz went from 301kb to 720kb with --no-sourcemap. More than double in size.

[rerickson1]

I see an increase in my bundle size if I use the --no-sourcemap option as well.
With ng build --prod --aot main.bundle.js is 825 KB, main.bundle.js.gz is 173 KB.
With ng build --prod --aot --no-sourcemap main.bundle.js is 2,837 KB, main.bundle.js.gz is 448 KB.
That's a 3.43 or 2.58 times increase when using the --no-sourcemap option. It looks like I would be better off using the --no-sourcemap option in production because my pages will load faster.

[filipesilva]

@naveedahmed1 @grizzm0 @rerickson1 my bad, fix in #3262

[naveedahmed1]

@filipesilva I tried angular-cli: 1.0.0-beta.21 and with ng build --aot --prod --no-sourcemap I am still getting the total bundles size of 38.4Mb while if I dont use the --no-sourcemap, the size of the generated bundles is 14.3Mb.

[filipesilva]

@naveedahmed1 #3262 has been merged but will only be out in the next release.

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