chore: setup prettier

[rafaelss95]

This:

• Removes conflicting tslint (stylistic) rules;
• Adds a few devDependencies:
  • "husky";
  • "lint-staged";
  • "prettier";
  • "rxjs-compat": Needed due to Unexpected peer dependency? SamVerschueren/listr#91 (lint-staged depends on this package);
• Formats all files using prettier;

See #557 (comment).

[rafaelss95]

Travis is currently failing and I'm not sure what the correct fix would be, but it looks like the lint-staged needs node >= 6 and travis is currently using node 5 and I also noticed that it's using older versions of rxjs/zone.js.

[mgechev]

Would you also switch to node stable from 5?

[rafaelss95]

I've switched to the latest LTS and the error is different now:

/Users/travis/.travis/job_stages: line 166: shell_session_update: command not found

[wKoza]

@rafaelss95 , why did you add the devDependencies husky ? I don't see it used.

[rafaelss95]

@wKoza husky is used to manage git hooks. In this case, it'll run what I've defined in lint-staged (format and lint fixes) and also will prevent commits if the tests aren't passing.

On other hand, I can remove it since the CI will fail anyway in a PR, for example. Let me know what's your decision.

[wKoza]

Ok, thanks @rafaelss95. I'm in favor of adding a hook for the lint. BTW, I was afraid of having a hook that launches TUs. (sometimes, We want to push a TU in failure in order to fix it later).