Enable devDependency pruning for Yarn 2

After monitoring the custom Yarn 2 plugin for a period of time there doesn't seem to be any issues from the 20% of builds that it has been active on.  This PR enables this feature completely and removes the old code path that used to handle pruning for Yarn 2.

Author: colincasey

CHANGELOG.md

@@ -2,7 +2,10 @@
 
 ## main
 
-## v195 (2022-04-12)
+## v196 (2022-05-18)
+- Enable Yarn 2 `devDependency` pruning using a custom plugin for all customers ([#1001](https://github.com/heroku/heroku-buildpack-nodejs/pull/1001))
+
+## v195 (2022-04-13)
 - Enable Yarn 2 `devDependency` pruning using a custom plugin for 20% of customers ([#999](https://github.com/heroku/heroku-buildpack-nodejs/pull/999))
 - Set xtrace mode in buildpack when BUILDPACK_XTRACE environment variable is set ([#925](https://github.com/heroku/heroku-buildpack-nodejs/pull/925))
 

buildpack.toml

@@ -3,10 +3,29 @@ name = "Node.js"
 
   [publish.Ignore]
   files = [
-      ".circle/",
+      ".circleci/",
       ".github/",
+      ".git2gus/",
       "etc/",
       "spec/",
       "test/",
-      "makefile"
+      "makefile",
+      "Gemfile.lock",
+      "Gemfile",
+      "hatchet.json",
+      "go.mod",
+      "go.sum",
+      "hatchet.lock",
+      "cmd/",
+      # TODO: get rid of these ignores once the yarn plugins are moved into a separate repo
+      #       for now we just need the compiled plugin in yarn2-plugin/prune-dev-dependencies/bundles
+      "yarn2-plugins/prune-dev-dependencies/.editorconfig",
+      "yarn2-plugins/prune-dev-dependencies/package-lock.json",
+      "yarn2-plugins/prune-dev-dependencies/.gitignore",
+      "yarn2-plugins/prune-dev-dependencies/package.json",
+      "yarn2-plugins/prune-dev-dependencies/tsconfig.json",
+      "yarn2-plugins/prune-dev-dependencies/README.md",
+      "yarn2-plugins/prune-dev-dependencies/tests",
+      "yarn2-plugins/prune-dev-dependencies/jest.config.js",
+      "yarn2-plugins/prune-dev-dependencies/src",
   ]

features

@@ -1,2 +1 @@
 cache-native-yarn-cache=100
-use-heroku-yarn-prune-plugin=20

lib/dependencies.sh

@@ -168,26 +168,10 @@ yarn_prune_devdependencies() {
     return 0
   elif $YARN_2; then
     cd "$build_dir" || return
-    meta_set "use-heroku-yarn-prune-plugin" "$(features_get_with_blank "use-heroku-yarn-prune-plugin")"
-    if [[ $(features_get_with_blank "use-heroku-yarn-prune-plugin") == "true" ]]; then
-      echo "Running 'yarn heroku prune'"
-      export YARN_PLUGINS="${buildpack_dir}/yarn2-plugins/prune-dev-dependencies/bundles/@yarnpkg/plugin-prune-dev-dependencies.js"
-      monitor "yarn-prune" yarn heroku prune
-      meta_set "workspace-plugin-present" "false"
-      meta_set "skipped-prune" "false"
-    elif has_yarn_workspace_plugin_installed "$build_dir"; then
-      echo "Running 'yarn workspaces focus --all --production'"
-      meta_set "workspace-plugin-present" "true"
-
-      # The cache is removed beforehand because the command is running an install on devDeps, and
-      # it will not remove the existing dependencies beforehand.
-      rm -rf "$cache_dir"
-      monitor "yarn-prune" yarn workspaces focus --all --production
-      meta_set "skipped-prune" "false"
-    else
-      meta_set "workspace-plugin-present" "false"
-      echo "Skipping because the Yarn workspace plugin is not present. Add the plugin to your source code with 'yarn plugin import workspace-tools'."
-    fi
+    echo "Running 'yarn heroku prune'"
+    export YARN_PLUGINS="${buildpack_dir}/yarn2-plugins/prune-dev-dependencies/bundles/@yarnpkg/plugin-prune-dev-dependencies.js"
+    monitor "yarn-prune" yarn heroku prune
+    meta_set "skipped-prune" "false"
   else
     cd "$build_dir" || return
     monitor "yarn-prune" yarn install --frozen-lockfile --ignore-engines --ignore-scripts --prefer-offline 2>&1