* Chore: align babel-eslint-parser & espree * Start program at beginning of comment when no tokens exist * Import correct version of Espree for tests * Remove hasOwnProperty guard
* chore: add eslint-plugin-jest * chore: update test sources * chore: suppress preset-env debug log when linting
* Centralize @babel/eslint-* tests * Enable linting of @babel/eslint-* test files * Add missing sourceType
