Preserve symlinks on Node.js >=v6.3.0

[zkochan]

Node.js v6.3.0 introduced a new option --preserve-symlinks that allows to make node resolve dependencies based on the symlinks location, not the realpath (read more: nodejs/node#3402)

This new feature makes it possible to use a global store for pnpm and as a consequence to greatly reduce the disk space needed for dependencies. (a discussion about this was here: #19)

However, the preserve symlinks feature is disabled by default and should be passed to node every time. E.g., node --preserve-symlinks index.js. As a consequence, executable in node_modules/.bin will not be executed with the --preserve-symlinks option.

Proposed changes

(node: I suggest to make these changes on top of #242)

The executables in .bin can be forced to run with --preserve-symlinks by

1. changing the shebangs to pass the --preserve-symlinks option to node

2. changing them from symlinks to proxy-files (real files that require the bin files from the symlinked package). E.g.:

   #!/bin/sh
   ":" //# comment; exec /usr/bin/env node --preserve-symlinks "$0" "$@"
   
   require('../eslint/bin/eslint')

3. making executables from the proxy-files. E.g. chmod 755 node_modules/.bin/eslint

[rstacruz]

Thanks, that's pretty interesting. Just to note, this won't work on all packages; mocha is one example that works a little differently :)