[Question/Documenation] Need more information about the usage of barrels

[bastienJS]

In the system.config.ts there is:

const cliSystemConfigPackages: any = {};
barrels.forEach((barrelName: string) => {
  cliSystemConfigPackages[barrelName] = { main: 'index' };
});

I could nowhere find information about:

1.) What exactly is a barrel
2.) Why gets each barrel a object { main: 'index' } assigned

Would you please explain the infrastructure you setup in your documentation.

[hcsalis]

Angular Glossary is a useful resource for Angular 2 vocabulary. You can find barrel definition here:

[https://angular.io/docs/ts/latest/glossary.html#!#B]

Regarding index files, barrel definition says:

The Angular scoped packages each have a barrel named index.

Hope this helps.

[bastienJS]

@hcsalis Thanks so is there a way not to use barrels? I can`t find anything useful in them personally. Now there is another layer of complexity just for exporting types from files? Thats cumbersome in my opinion. For example, who must add those barrels? I could not find any information about that?! The .config file says:" * Everything underneath this line is managed by the CLI." so how is the CLI adding those barrels? What "ng command" do I have to use to create those barrels? I checked https://github.com/angular/angular-cli but there is no word about "barrels" or "index".

[slmyers]

ng g <type> will result in barrel registration of the object.

generate results in barrel registration
"barrel spec"

[filipesilva]

@bastienJS barrels - index.ts files - are generated by the route (now disabled) and component generators automatically, as well as automatically updating system-config.ts to include these.

You don't have to use barrels, but since it is a best practice included in the style guide the CLI helps out in it.

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