Improve pm2 cooperation with homebrew node version on mac

What's going wrong?

In the launchd script on mac the path indicates the path of the node binary installed by homebrew:

<string>/usr/local/Cellar/node/8.5.0/bin</string>

This becomes a problem as soon as homebrew updates node to a new version because in that case the path information becomes wrong.

As the current homebrew node binary is symlinked into /usr/local/bin, it would be better to use following path in the launchd script:

<string>/usr/local/bin</string>

How could we reproduce this issue?

Install node with homebrew on a mac. The problem occurs as soon as there is an update to node installed with homebrew.

Supporting information

===============================================================================
--- PM2 REPORT (Tue Oct 31 2017 11:30:03 GMT+0100 (CET)) ----------------------
===============================================================================
--- Daemon -------------------------------------------------
pm2d version         : 2.7.2
node version         : 8.8.1
node path            : /usr/local/bin/pm2
argv                 : /usr/local/Cellar/node/8.8.1/bin/node,/usr/local/lib/node_modules/pm2/lib/Daemon.js
argv0                : node
user                 : tolink
uid                  : 501
gid                  : 20
uptime               : 805min
===============================================================================
--- CLI ----------------------------------------------------
local pm2            : 2.7.2
node version         : 8.8.1
node path            : /usr/local/bin/pm2
argv                 : /usr/local/Cellar/node/8.8.1/bin/node,/usr/local/bin/pm2,report
argv0                : node
user                 : tolink
uid                  : 501
gid                  : 20
===============================================================================
--- System info --------------------------------------------
arch                 : x64
platform             : darwin
type                 : Darwin
cpus                 : Intel(R) Core(TM) i5-6360U CPU @ 2.00GHz
cpus nb              : 4
freemem              : 356536320
totalmem             : 8589934592
home                 : /Users/tolink
===============================================================================
--- PM2 list -----------------------------------------------
┌──────────┬────┬──────┬──────┬────────┬─────────┬────────┬─────┬───────────┬────────┬──────────┐
│ App name │ id │ mode │ pid  │ status │ restart │ uptime │ cpu │ mem       │ user   │ watching │
├──────────┼────┼──────┼──────┼────────┼─────────┼────────┼─────┼───────────┼────────┼──────────┤
│ datstore │ 0  │ fork │ 4302 │ online │ 0       │ 12h    │ 0%  │ 45.5 MB   │ tolink │ disabled │
└──────────┴────┴──────┴──────┴────────┴─────────┴────────┴─────┴───────────┴────────┴──────────┘
===============================================================================
--- Daemon logs --------------------------------------------
/Users/tolink/.pm2/pm2.log last 20 lines:
PM2        | 2017-10-26 07:41:13: App [datstore] with id [0] and pid [20795], exited with code [0] via signal [SIGTERM]
PM2        | 2017-10-26 07:41:13: pid=20795 msg=process killed
PM2        | 2017-10-26 07:41:13: [PM2] Exited peacefully
PM2        | 2017-10-30 22:04:03: ===============================================================================
PM2        | 2017-10-30 22:04:03: --- New PM2 Daemon started ----------------------------------------------------
PM2        | 2017-10-30 22:04:03: Time                 : Mon Oct 30 2017 22:04:03 GMT+0100 (CET)
PM2        | 2017-10-30 22:04:03: PM2 version          : 2.7.2
PM2        | 2017-10-30 22:04:03: Node.js version      : 8.8.1
PM2        | 2017-10-30 22:04:03: Current arch         : x64
PM2        | 2017-10-30 22:04:03: PM2 home             : /Users/tolink/.pm2
PM2        | 2017-10-30 22:04:03: PM2 PID file         : /Users/tolink/.pm2/pm2.pid
PM2        | 2017-10-30 22:04:03: RPC socket file      : /Users/tolink/.pm2/rpc.sock
PM2        | 2017-10-30 22:04:03: BUS socket file      : /Users/tolink/.pm2/pub.sock
PM2        | 2017-10-30 22:04:03: Application log path : /Users/tolink/.pm2/logs
PM2        | 2017-10-30 22:04:03: Process dump file    : /Users/tolink/.pm2/dump.pm2
PM2        | 2017-10-30 22:04:03: Concurrent actions   : 2
PM2        | 2017-10-30 22:04:03: SIGTERM timeout      : 1600
PM2        | 2017-10-30 22:04:03: ===============================================================================
PM2        | 2017-10-30 22:41:55: Starting execution sequence in -fork mode- for app name:datstore id:0
PM2        | 2017-10-30 22:41:55: App name:datstore id:0 online

Locate the macOS launchd script that currently embeds the versioned Homebrew Node path under /usr/local/Cellar. Reproduce the problem by updating Homebrew Node, then verify the launchd configuration continues to use the stable /usr/local/bin path after the change.