Prettier: failed to parse buffer (PrettierAsync) for every JS file

Do you want to request a feature or report a bug?
Bug

What is the current/expected behavior?
Using PrettierAsync always results in the error Prettier: failed to parse buffer. Prettier command works fine (on every file).

What version of vim-prettier are you using - (output of :PrettierVersion) ?
0.2.7

What version of prettier are you using - (output of :PrettierCliVersion) ?
1.16.1

What is your prettier executable path - (output of :PrettierCliPath) ?
/Users/dsaenger/code/titan-web/node_modules/.bin/prettier
(local project path)

Did this work in previous versions of vim-prettier and/or prettier ?
Did not use vim-prettier before

To be clear: This error always occurs with whatever JS file when using :PrettierAsync, even Hello World:

console.log('Hello World');

.. but :Prettier works fine.

I'm using https://github.com/skwp/dotfiles vim config .. maybe vim-prettier does not work with another plugin .. how can I debug this?

Start by reproducing the failure with :PrettierAsync on the minimal JavaScript example, then compare it with the working :Prettier command using vim-prettier 0.2.7, Prettier 1.16.1, and the reported local executable path. Done means asynchronous formatting accepts ordinary JavaScript files without the parse-buffer error while the synchronous command continues to work.