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npm glob pattern not matching subdirectories

Posted by: admin November 29, 2017 Leave a comment

Questions:

In my package.json, I have a scripts block that uses **/*Test.js to match files. When run via npm, they do not match sub-directories more than one level. When executed on the command line directly, they work as expected.

Can anyone explain what is happening, and provide a workaround or solution?

package.json

{
  "name": "immutable-ts",
  "scripts": {
    "test": "echo mocha dist/**/*Test.js",
  }
}

Execution

% npm run test

> [email protected] test:unit .../immutable-ts
> echo mocha dist/**/*Test.js

mocha dist/queue/QueueTest.js dist/stack/StackTest.js

% echo mocha dist/**/*Test.js

mocha dist/queue/QueueTest.js dist/stack/StackTest.js dist/tree/binary/BinaryTreeTest.js

% ls dist/**/*                                                                                                                                                                                          

dist/collections.js  dist/queue/QueueTest.js  dist/tree/binary/BinaryTree.js      dist/immutable.js.map        dist/stack/Stack.js.map             dist/tree/binary/BinaryTreeTest.js.map
dist/immutable.js    dist/stack/Stack.js      dist/tree/binary/BinaryTreeTest.js  dist/queue/Queue.js.map      dist/stack/StackTest.js.map
dist/queue/Queue.js  dist/stack/StackTest.js  dist/collections.js.map             dist/queue/QueueTest.js.map  dist/tree/binary/BinaryTree.js.map
Answers:

Solution

Change your scripts so that what you pass to Mocha is protected from expansion by the shell:

"scripts": {
    "test": "mocha 'dist/**/*Test.js'",
 }

Note the single quotes around the parameter given to mocha.

Explanation

This issue is fixable without resorting to external tools. The root cause of your problem is that by npm uses sh as the shell that will run your script commands.

It is overwhelmingly the case that when a *nix process starts a shell it will start sh unless there is something telling it to do otherwise. The shell preference you set for logins does not constitute a way to “tell it otherwise”. So if you have, say, zsh as your login shell, it does not entail that npm will use zsh.

Those implementations of sh that do not include any extensions beyond what sh should provide do not understand the ** glob in the way you want it to. As far as I can tell, it is interpreted as *. However, Mocha interprets the paths passed to it using its a JavaScript implementation of globs. So you can work around the issue by protecting your globs from being interpreted by sh. Consider the following package.json:

{
  "name": "immutable-ts",
  "scripts": {
    "bad": "mocha test/**/*a.js",
    "good": "mocha 'test/**/*a.js'",
    "shell": "echo $0"
  }
}

The shell script is just so that we can check what shell is running the script. If you run it, you should see sh.

Now, given the following tree:

test/
├── a.js
├── b.js
├── x
│   ├── a
│   │   ├── a.js
│   │   └── b.js
│   ├── a.js
│   └── b
│       └── a.js
└── y
    ├── a.js
    └── q

With all a.js and b.js files containing it(__filename);. You get the following results:

$ npm run bad

> [email protected] bad /tmp/t2
> mocha test/**/*a.js

  - /tmp/t2/test/x/a.js
  - /tmp/t2/test/y/a.js

  0 passing (6ms)
  2 pending

$ npm run good

> [email protected] good /tmp/t2
> mocha 'test/**/*a.js'

  - /tmp/t2/test/a.js
  - /tmp/t2/test/x/a.js
  - /tmp/t2/test/x/a/a.js
  - /tmp/t2/test/x/b/a.js
  - /tmp/t2/test/y/a.js

  0 passing (5ms)
  5 pending

Questions:
Answers:

You can inline the find command with the -name option in your scripts to replace the extended globbing syntax provided by zsh.

In your case, the command would be:

mocha `find dist -type f -name '*Test.js'`

You can realistically omit the -type f part if you’re confident that you won’t ever put “Test.js” in a directory name. (A safe assumption, most likely, but I included it for completeness sake)

Questions:
Answers:

The glob expansion is actually done by your shell and that’s why it works from the command line.

You can do mocha --recursive and point at your test directory.