Localized Build doesn't work

[REQUIRED] Describe your environment

• Operating System version: macOS Sierra 10.12.6
• Firebase UI version: 4.4.0

[REQUIRED] Describe the problem

I try to build a localized version as described on your pages. But after npm install I get this error

make: *** [Release/obj.target/binding/src/create_string.o] Error 1
gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/Users/**/firebaseui-web/node_modules/node-gyp/lib/build.js:262:23)
gyp ERR! stack     at ChildProcess.emit (events.js:210:5)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:272:12)
gyp ERR! System Darwin 16.7.0
gyp ERR! command "/usr/local/Cellar/node/12.12.0/bin/node" "/Users/**/firebaseui-web/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/**/firebaseui-web/node_modules/node-sass
gyp ERR! node -v v12.12.0
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok 
Build failed with error code: 1
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: google-closure-compiler-linux@20190415.0.0 (node_modules/google-closure-compiler-linux):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for google-closure-compiler-linux@20190415.0.0: wanted {"os":"linux","arch":"x64,x86"} (current: {"os":"darwin","arch":"x64"})

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass@3.13.1 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the node-sass@3.13.1 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/**/.npm/_logs/2020-03-06T20_20_25_233Z-debug.log

If I try to go on and run npm run build build-npm-de I get this error:

    throw err;
    ^

Error: Cannot find module 'gulp-sass'
Require stack:
- /Users/**/firebaseui-web/gulpfile.js
- /Users/**/firebaseui-web/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/index.js
- /Users/**/firebaseui-web/node_modules/gulp/node_modules/gulp-cli/index.js
- /Users/**/firebaseui-web/node_modules/gulp/bin/gulp.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:794:15)
    at Function.Module._load (internal/modules/cjs/loader.js:687:27)
    at Module.require (internal/modules/cjs/loader.js:849:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/Users/**/firebaseui-web/gulpfile.js:25:14)
    at Module._compile (internal/modules/cjs/loader.js:956:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:849:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Users/**/firebaseui-web/gulpfile.js',
    '/Users/**/firebaseui-web/node_modules/gulp/node_modules/gulp-cli/lib/versioned/^4.0.0/index.js',
    '/Users/**/firebaseui-web/node_modules/gulp/node_modules/gulp-cli/index.js',
    '/Users/**/firebaseui-web/node_modules/gulp/bin/gulp.js'
  ]
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! firebaseui@4.4.0 build: `gulp "build-npm-de"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the firebaseui@4.4.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/**/.npm/_logs/2020-03-06T20_26_49_848Z-debug.log 

Steps to reproduce:

run the instructions on your page:

• git clone
• cd into the folder
• npm install
• npm run build build-npm-de

Help would be very much appreciated - and I need the German version so if anyone has a built one, that would be also very helpful. BR

[netzwerg]

For anyone just interested in building artifacts with localized text: I created a minimal fork which skips all CSS, SASS, tests etc. (like described by @dalibor-123 ). Tested on Mac/OSX.

https://github.com/netzwerg/firebaseui-web

Hope it helps!

[pfiadDi]

great thank you @netzwerg ! A little bit disappointing though that we didn’t hear anything from Google. They want us to use the UI to push a more secure and their UI concept but no reaction what so ever in such an important issue…