regexr in json file

Question

I'm reading the article Debugging ES6 in Visual Studio Code and find a syntax in launch.json file that I don't quite understand.

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "name": "Launch App.js",
      "program": "${workspaceRoot}/src/app.js",
      "outFiles": [ "${workspaceRoot}/.compiled/**/*.js" ]
    }
}

 "outFiles": [ "${workspaceRoot}/.compiled/**/*.js" ]

What does the ** (two stars) represent? Also, does *.js match filname.js.map beside matching filename.js? I am not sure if this kind of pattern relates to regexr.

That looks more like a glob than regex. Either way, it has nothing to do with JSON. — Biffen
– Biffen, Commented Jun 25, 2018 at 6:58
*.js will match filename.js but it should not match filename.js.map It is not a regular expression. — mankowitz
– mankowitz, Commented Jun 25, 2018 at 7:07
Also, this is a duplicate: stackoverflow.com/questions/32604656/what-is-the-glob-character — mankowitz
– mankowitz, Commented Jun 25, 2018 at 7:11

Serg · Accepted Answer · 2018-06-25 07:08:19Z

2

This is not a regex (because dot in ".js" does not look like it matches any character).

This is kind of fancy wildcard for a filename:

${workspaceRoot} - some environmental variable
/.compiled - exact name of folder (e.g. for generated code)
/** - any set of nested folders
/*.js - any file with js extension at path specified before

Also, does *.js match filname.js.map beside matching filename.js?

I assume that it does not, only filename.js.

answered Jun 25, 2018 at 7:08

Serg

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Comments

mankowitz · Accepted Answer · 2018-06-25 07:00:10Z

1

the ** (double-glob) means that it will search in any number of subdirectories. For example,

a/**/b

will match

a/a/b

a/c/b

a/c/a/b

and so on.

answered Jun 25, 2018 at 7:00

mankowitz

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