feat(ng2-cli): add *.metadata.json

[n-sviridenko]

Update by valorkin:

• npm prepublish should generate metadata

---

When I'm try to launch ng-xi18n on rc6 via npm, I have this error:

$ ng-xi18n

Error: Unexpected value 'TypeaheadModule' imported by the module 'LocationModule'
    at /srv/app/node_modules/@angular/compiler/bundles/compiler.umd.js:14118:37
    at Array.forEach (native)
    at CompileMetadataResolver.getNgModuleMetadata (/srv/app/node_modules/@angular/compiler/bundles/compiler.umd.js:14103:46)
    at /srv/app/node_modules/@angular/compiler/bundles/compiler.umd.js:12947:58
    at Array.forEach (native)
    at OfflineCompiler.analyzeModules (/srv/app/node_modules/@angular/compiler/bundles/compiler.umd.js:12946:21)
    at Extractor.extract (/srv/app/node_modules/@angular/compiler-cli/src/extract_i18n.js:92:47)
    at extract (/srv/app/node_modules/@angular/compiler-cli/src/extract_i18n.js:16:35)
    at Object.main (/srv/app/node_modules/@angular/tsc-wrapped/src/main.js:30:16)
    at Object.<anonymous> (/srv/app/node_modules/@angular/compiler-cli/src/extract_i18n.js:161:9)
Extraction failed

[n-sviridenko]

The code of the LocationModule:

...
import { TypeaheadModule } from 'ng2-bootstrap';

@NgModule({
  imports: [
    ...,
    TypeaheadModule,
  ],
  ...
})
export class LocationModule {}

[Martin-Luft]

Please try import { TypeaheadModule } from 'ng2-bootstrap/ng2-bootstrap';

[n-sviridenko]

Unfortunately, the same behaviour.

[tamaracha]

I get the same behavior with compiler-cli by importing CollapseModule this way:

import { CollapseModule } from 'ng2-bootstrap/components/collapse';

and this way:

import { CollapseModule } from 'ng2-bootstrap/ng2-bootstrap';

It happens, when CollapseModule is included in NgModule imports array. In urish/ngx-moment#68 and yabab-dev/ng2-ckeditor#36 it is assumed, that a *.metadata.json is expected by compiler-cli. The angular packages contain them, ng2-bootstrap package does not.

[freezy]

Any update on this? I've tried generating the metadata files, but it fails with Error encountered resolving symbol values statically. Expression form not supported for all the template literals used in the @Component definitions.

[otelnov]

working on it. there are lot of es6 template literals I should change, no chance compile with it.

[raphaelmesquita]

Also, I noticed that some parts of the code just wont compile to js after building the transpiled typescript with ngc. Apparently this is because angular does not allow private or protected fields to be used in the template when compiling AoT. Are you guys aware of this issue?