Configure livesync excludes

[hdeshev]

UsbLiveSyncService has a private array of excluded patterns:

private excludedProjectDirsAndFiles = [
    "app_resources"
];

Some NPM modules (e.g. Angular2) are pretty huge and contain lots of unnecessary files (2432 files for Angular 2 at the time of this writing) which don't need to be synced to the device. We can speed initial syncs up by excluding files like *.ts, *.map, *.md, certain directories, etc.

It'd be great if we had some file, say .livesyncignore where we can list exclusion patterns.

[ligaz]

Ideally this should be part of a hook that gets installed somehow (ex. as an npm package). For example the TypeScript transpiling hook can omit the *.ts from the LiveSync process, the Angular 2 plugin can omit all Angular specific files, etc.

[hdeshev]

I like the hook idea. I still think we may need an ignore file to let developers easily ignore junk shipped with some module we've never heard of, but we can ship that later. (Implemented as a hook, of course! 🎉) .

I can imagine hooks being functions of the type Array<Path> => Array<Path>. How do we register those with the CLI?

[ligaz]

We are yet to figure this out in the upcoming weeks. We have done some previous work for AppBuilder CLI and we will try to leverage it.

[enchev]

Most probably related to #887

Maybe we can have .tnsignore.debug and .tnsignore.release. In the debug version we can put something specific for livesync.

[enchev]

Merged with #887