DEV: Switch to pnpm for JS dependencies (#28671)

This will bring significant improvements to install speed & storage requirements. For information on how it may affect you, see https://meta.discourse.org/t/324521

This commit:
- removes the `yarn.lock` and replaces with `pnpm-lock.yaml`
- updates workspaces to pnpm format
- adjusts package dependencies to work with pnpm's stricter resolution strategy
- updates Rails app to load modules from more specific node_modules directories
- adds a `.pnpmfile` which automatically cleans up old yarn-managed `node_modules` directories
- updates various scripts to call `pnpm` instead of `yarn`
- updates patches to use pnpm's native patch system instead of patch-package
- adds a patch for licensee to support pnpm

bin/docker/boot_dev

@@ -117,8 +117,8 @@ docker run -d \
 echo "Installing gems..."
 "${SCRIPTPATH}/bundle" install
 
-echo "Yarn install..."
-"${SCRIPTPATH}/exec" yarn install --cwd app/assets/javascripts/discourse
+echo "pnpm install..."
+"${SCRIPTPATH}/exec" pnpm install
 
 if [ "${initialize}" = "initialize" ]; then
     echo "Migrating database..."

bin/ember-cli

@@ -1,13 +1,12 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-require 'pathname'
+require "pathname"
 
 RAILS_ROOT = File.expand_path("../../", Pathname.new(__FILE__).realpath)
 PORT = ENV["UNICORN_PORT"] ||= "3000"
 HOSTNAME = ENV["DISCOURSE_HOSTNAME"] ||= "127.0.0.1"
-YARN_DIR = File.join(RAILS_ROOT, "app/assets/javascripts/discourse")
-CUSTOM_ARGS = ["--try", "--test", "--build", "--unicorn", "-u", "--forward-host"]
+CUSTOM_ARGS = %w[--try --test --build --unicorn -u --forward-host]
 PROXY =
   if ARGV.include?("--try")
     "https://try.discourse.org"
@@ -46,25 +45,25 @@ if ARGV.include?("-h") || ARGV.include?("--help")
   puts "#{"--test".cyan} To run the test suite"
   puts "#{"--unicorn, -u".cyan} To run a unicorn server as well"
   puts "The rest of the arguments are passed to ember server per:", ""
-  exec "yarn -s --cwd #{YARN_DIR} run ember #{command} --help"
+  exec "pnpm ember #{command} --help"
 end
 
-args = ["-s", "--cwd", YARN_DIR, "run", "ember", command] + (ARGV - CUSTOM_ARGS)
+args = ["--dir=app/assets/javascripts/discourse", "ember", command] + (ARGV - CUSTOM_ARGS)
 
 if !args.include?("test") && !args.include?("build") && !args.include?("--proxy")
   args << "--proxy"
   args << PROXY
 end
 
-# Running yarn install in the root directory will also run it for YARN_DIR via a post-install hook
-exit 1 if !system "yarn", "-s", "install", "--cwd", RAILS_ROOT
+if !system "pnpm", "--dir=#{RAILS_ROOT}", "install"
+  abort "pnpm is not installed. run `npm install -g pnpm`" if !system("command -v pnpm >/dev/null;")
+  exit 1
+end
 
-yarn_env = {
+pnpm_env = {
   "TERM" => "dumb", # simple output from ember-cli, so we can parse/forward it more easily
 }
-if ARGV.include?("--forward-host")
-  yarn_env["FORWARD_HOST"] = "true"
-end
+pnpm_env["FORWARD_HOST"] = "true" if ARGV.include?("--forward-host")
 
 if ARGV.include?("-u") || ARGV.include?("--unicorn")
   unicorn_env = { "DISCOURSE_PORT" => ENV["DISCOURSE_PORT"] || "4200" }
@@ -72,12 +71,13 @@ if ARGV.include?("-u") || ARGV.include?("--unicorn")
   ember_cli_pid = nil
 
   Thread.new do
-    require 'open3'
-    Open3.popen2e(yarn_env, "yarn", *args.to_a.flatten) do |i, oe, t|
+    require "open3"
+    Open3.popen2e(pnpm_env, "pnpm", *args.to_a.flatten) do |i, oe, t|
       ember_cli_pid = t.pid
       puts "Ember CLI running on PID: #{ember_cli_pid}"
       oe.each do |line|
-        if line.include?("\e[32m200\e") || line.include?("\e[36m304\e[0m") || line.include?("POST /message-bus")
+        if line.include?("\e[32m200\e") || line.include?("\e[36m304\e[0m") ||
+             line.include?("POST /message-bus")
           # skip 200s and 304s and message bus
         else
           puts "[ember-cli] #{line}"
@@ -102,5 +102,5 @@ if ARGV.include?("-u") || ARGV.include?("--unicorn")
     Process.kill("TERM", ember_cli_pid)
   end
 else
-  exec(yarn_env, "yarn", *args.to_a.flatten)
+  exec(pnpm_env, "pnpm", *args.to_a.flatten)
 end

bin/yarn-app

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-yarn --cwd "`dirname $0`"/../app/assets/javascripts/discourse "$@"