* Fix plugin resolution when path does not start with ./
* Minor consistency fix: use "if (resolvedPluginSearchDir) {...}" in load-plugins
* Use more appropriate quotes in plugin-resolution.js
* Try both local paths and node modules when resolving plugins manually
* Test bespoke plugin loading by node module name
* Simplify getFileInfo() as suggested by @j-f1
https://github.com/prettier/prettier/pull/4341#discussion_r187112707
Alexander Kachkaev