esc_jj_keybinding.ts

[gaidenk]

Please finish the following when submitting a pull request:

• [ ] Add a line to History.md briefly documenting the change.

If this is a release, additionally do the following:

• [ ] Bump the package version in package.json
• [ ] Update the dependencies in package.json
• [ ] Run jlpm install to update yarn.lock

Thanks!