* fix: correct reading of sync-labels input.
Contrary to the assumptions made in the unit tests, core.getInput
always returns a string, and !!'false' is true.
Also updates the unit test to reduce changes of regressions by ensuring
that the mocked getInput returns a string, as it would in production.
Fixes https://github.com/actions/labeler/issues/112
Make sure test catches regressions.
* Rebuild dist/index.js.
This is not intended to be a comprehensive test suite; I'm just trying to get us started by adding tests for some of the most important functionality.
This necessitated some minor refactoring. Previously, `main.ts` just directly invoked the main entrypoint function `run()`, which made it impossible to unit test the module without causing the side-effects of `run`.
As a workaround I created a new module `labeler.ts`, which just exports the functions we want to test without executing the main entrypoint, and simplified `main.ts` so that it only imports the entrypoint and executes it.
It's basically just a re-org. The diff makes it look way more complicated than it is.
