Check file exists before launch it in webpack npm scripts

Question

I have a package.json like this:

...
  "scripts": {
    "dev": "webpack --config webpack.dev.config.js --mode development --progress --colors",
    "postdev": "if (Test-Path \"./postdev.sh\" ) { echo \"file exists\"; ./postdev.sh }"
  },
...

How can I check if file "postdev.sh" exists and then launch it in NPM-scripts section? I run that command in the terminal and it goes correctly, but if I try to launch that npm-script it says "Unexpected appearance: "./postdev.sh"."

Solution found here: https://stackoverflow.com/questions/4340350/how-to-check-if-a-file-exists-from-inside-a-batch-file — G. Goncharov, Sep 24 '21 at 06:09

score 2 · Answer 1 · answered Sep 23 '21 at 21:11

2

on macos or linux try this one for postdev:

"postdev": "test -f ./postdev.sh && echo 'file exisits' && ./postdev.sh",

answered Sep 23 '21 at 21:11

Dmitriy Ievlev

191
3
6

1

Most of our project developers use Windows, so am I, and on Windows it doesn't work :( – G. Goncharov Sep 24 '21 at 04:09
@G.Goncharov check my cross-platform answer. :) https://stackoverflow.com/a/74738571/7242535 – nelson6e65 Dec 09 '22 at 03:16

score 2 · Answer 2 · answered Dec 09 '22 at 03:14

You can use path-exists-cli package, a cross-platform tool, to check if a file/directory exists and use && or || after to run the next command if exists or not, respectively:

{
  "scripts": {
    // other scripts...
    "postdev": "path-exists ./postdev.sh && echo 'Exists' || echo 'Does not exists'"
  }
}

score 1 · Answer 3 · answered Sep 24 '21 at 05:10

1

Finnally found a solution (maybe it works only on Windows, but it is enough for me):

"postdev": "if exist postdev.sh ( postdev.sh )",

answered Sep 24 '21 at 05:10

G. Goncharov

172
1
14

Check file exists before launch it in webpack npm scripts

3 Answers3