add error for local changes overwritten

[mathieudutour]

No description provided.

[shiftkey]

@mathieudutour thanks for the PR! I thought there was a problem on our end but it turns out that the new test introduces a linting issue:

$ npm run is-it-pretty

> dugite@1.81.0 is-it-pretty /Users/shiftkey/src/dugite
> prettier --check "{examples,lib,script,test}/**/*.ts"

Checking formatting...
test/fast/git-process-test.ts
Code style issues found in the above file(s). Forgot to run Prettier?
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! dugite@1.81.0 is-it-pretty: `prettier --check "{examples,lib,script,test}/**/*.ts"`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the dugite@1.81.0 is-it-pretty script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/shiftkey/.npm/_logs/2019-01-28T22_42_25_147Z-debug.log

Running npm run prettify will tidy this up.

[mathieudutour]

Fixed! If I have time I might send a PR to desktop/desktop to use this new error and show an actionable popup when it's happening (maybe stash/discard/cancel)

[shiftkey]

@mathieudutour thanks! I'll see if I can publish a new release to NPM in the meantime to unblock you!