ng build --prod doesn't minified ngsw-worker.js

[adrian-daniel-garcia]

When building for production environment ngsw-worker/js file included in /DIST folder isn;y minified. We can save 75 KB and get better performance

Version 1.7.3

Angular CLI: 1.7.3
Node: 9.5.0
OS: win32 x64
Angular: 5.2.8
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router, service-worker

@angular/cli: 1.7.3
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.5.3
webpack: 3.11.0

Repro steps

• Step 1: run ng build --prod
• Step 2 go to dist foled
• Step 3 Open the ngsw-worker.js. You will see coment and a readeable js file

Observed behavior

The file contains 107KB of code

Desired behavior

The file is minified and contains less than 35KB of code

[awerlang]

Neither it is transpiled down to ES5. Service workers are supported in environments where async functions aren't (Chrome <= 54) so it fails.

[topaxi]

It seems to be transpiled down to ES2015 now, using generators instead of async/await. Still no minification though.

[etiennetalbot]

Just leaving a note here... Be very careful about fixing this bug as a lot of people are working around this issue angular/angular#21191 by inserting specific code in this very file. See comment: angular/angular#21191 (comment)

Maybe issue angular/angular#21191 should be addressed first

EDIT: I know that this issue shouldn't depend on the other one. If a fix is possible to minify ngsw-worker.js, it should be addressed.

[filipesilva]

Heya, this issue is the same as #11538. I'm closing this one in favor of that one because it has an answer from the team member responsible for service workers.

[awerlang]

@filipesilva this one is #9970, I guess you mean another.

[filipesilva]

@awerlang sorry about that, fixed the link now.

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