Remark: Remark fails when used in lint-staged pre-commit hook

[jpohancenik]

Remark fails when used in pre-commit hook

Remark fails when used in combination with lint-staged package for multiple .md files with error:

Error: Cannot write multiple files to single output: [path-to-local-repo]\1.md
  at done ([path-to-node-modules]\unified-engine\lib\file-pipeline\copy.js:63:9)
  at onstatfile ([path-to-node-modules]\unified-engine\lib\file-pipeline\copy.js:46:7)
  at FSReqCallback.oncomplete (fs.js:159:5)

When running outside the coomit hook (npm run md:fix), remark works as expected.

Your environment

• OS: WIN 10
• Packages: see package.json in included minimal reproduction
• Env: node 12.13.0

Steps to reproduce

1. clone the repo https://github.com/jpohancenik/remark-lint-issue
2. run npm i to install packages
3. make some invalid changes in 1.md and 2.m (e.g. multiple empty lines between text)
4. stash the files git add .
5. commit the files git commit -m test
6. see the error in console

minimal reproduction: https://github.com/jpohancenik/remark-lint-issue

Expected behaviour

Remark should write fixes to output files without throwing error.

Actual behaviour

Remark fails with error message Cannot write multiple files to single output

[wooorm]

You can fix this if you add -- to the end of your script, like so: remark . -o --.
This feature, which many other commands also support, says to not parse further values (which lint-staged passes) as arguments, but instead as files!

[jpohancenik]

Thank you, works like a charm!