Babel build program is breaking permission of NPM bin script - node.js

Question

I have NPM package with a bin property linking to a script, e.g.
/foo/package.json
{
"name": "foo",
"bin": "./dist/index.js"
}
/foo/src/index.js
#! /usr/bin/env node
console.log('Hello, World!');
I use npm link to create a globally-installed symbolic link of foo package.
Then I use:
node ./node_modules/.bin/babel\
--watch ./src\
--out-dir ./dist
Next, I have a bar package.
package.json
{
"name": "bar",
"scripts": {
"test-foo": "foo"
}
}
I use npm link foo to create a symlink from the local node_modules folder to the global symlink.
Then I attempt to execute npm run test-foo. I expect to get "Hello, World!" message. Instead, I get the following error message:
npm run test-foo
> bar#0.0.0 test-foo /bar
> foo
sh: /Users/gajus/bar/node_modules/.bin/foo: Permission denied
npm ERR! Darwin 15.2.0
npm ERR! argv "/Users/gajus/.nvm/versions/node/v5.3.0/bin/node" "/Users/gajus/.nvm/versions/node/v5.3.0/bin/npm" "run" "test-foo"
npm ERR! node v5.3.0
npm ERR! npm v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! bar#3.7.3 test-foo: `foo`
npm ERR! Exit status 126
npm ERR!
npm ERR! Failed at the table#3.7.3 test-foo script 'foo'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the table package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! foo
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs table
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls table
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/gajus/Documents/dev/gajus/table/npm-debug.log
Which is basically complaining that current user does not have permission to execute /Users/gajus/bar/node_modules/.bin/foo file.
I can solve this with:
chmod +x /Users/gajus/bar/node_modules/.bin/foo
However, I do not understand what is the reason that this file does not have permission to be executed in the first place. I am running babel program as the same user.
It appears to be an issue with the way NPM setups a global symlink (it sets it once. When babel --watch creates a new file, it no longer persists).
What is the solution to have +x persist with npm link?

Answer 1

The solution was pretty simple: give permissions to execute the source file, i.e.,
chmod +x /foo/src/index.js
When Babel program copies the files, it will also copy the permissions of that file. This works with --watch too.