make running with Plug'n Play possible on node 13 (yarnpkg#7650)

* ci(circleci): prevent timeout on circle-ci macos node10 build

The circle ci job for macOS on node 10 currently fails because it takes too long
(both PR's yarnpkg#7649 and yarnpkg#7650 don't green because of that). A big chunk of the time
is taken by updating homebrew - which in this macOS (the one connected to xcode 9
=> macOS 10.12) does not contain node 10 by default.

This change:
- sets the required xcode version to 11.0 -> this gets us a more up to date macOS
  version (except for node 6, which isn't available in the homebrew associated
  with xcode 11)
- removes the brew update from the macOS node 10 job

* fix(generate-pnp-map-api.tpl.js): make running with Plug'n Play possible on node 13

On node 13 Module._findPath (which the setup() of this module redefines) also gets
called with null for the path parameter (by lib/internal/bootstrap/pre_execution.js
in the (new) function resolveMainPath).

This fix ensures the patched _findPath also handles that situation.

* ci(azure-pipelines): add node 13 (and 12) to the azure-pipeline matrix

yarnpkg#7642

* ci(circleci): add node 13 (and 12) to the build matrix (linux)

* docs(CHANGELOG.md): adds PR yarnpkg#7650 to the change log

.circleci/config.yml

@@ -122,6 +122,16 @@ jobs:
           root: ~/project
           paths:
             - yarn
+  test-pkg-tests-linux-node13:
+    <<: *docker_defaults
+    docker:
+      - image: node:13
+    <<: *pkg_tests
+  test-pkg-tests-linux-node12:
+    <<: *docker_defaults
+    docker:
+      - image: node:12
+    <<: *pkg_tests
   test-pkg-tests-linux-node10:
     <<: *docker_defaults
     docker:
@@ -130,8 +140,20 @@ jobs:
   test-pkg-tests-linux-node8:
     <<: *docker_defaults
     <<: *pkg_tests
+  test-linux-node13:
+    <<: *docker_defaults
+    docker:
+      - image: node:13
+    <<: *test_steps
+  test-linux-node12:
+    <<: *docker_defaults
+    docker:
+      - image: node:12
+    <<: *test_steps
   test-linux-node10:
     <<: *docker_defaults
+    docker:
+      - image: node:10
     <<: *test_steps
   test-linux-node8:
     <<: *docker_defaults
@@ -249,6 +271,14 @@ workflows:
           filters: *default_filters
           requires:
             - install
+      - test-pkg-tests-linux-node13:
+          filters: *default_filters
+          requires:
+            - install
+      - test-pkg-tests-linux-node12:
+          filters: *default_filters
+          requires:
+            - install
       - test-pkg-tests-linux-node10:
           filters: *default_filters
           requires:
@@ -257,6 +287,14 @@ workflows:
           filters: *default_filters
           requires:
             - install
+      - test-linux-node13:
+          filters: *default_filters
+          requires:
+            - install
+      - test-linux-node12:
+          filters: *default_filters
+          requires:
+            - install
       - test-linux-node10:
           filters: *default_filters
           requires:
@@ -295,8 +333,12 @@ workflows:
             branches:
               ignore: /.*/
           requires:
+            - test-pkg-tests-linux-node13
+            - test-pkg-tests-linux-node12
             - test-pkg-tests-linux-node10
             - test-pkg-tests-linux-node8
+            - test-linux-node13
+            - test-linux-node12
             - test-linux-node10
             - test-linux-node8
             - test-linux-node6

CHANGELOG.md

@@ -4,10 +4,15 @@ Please add one entry in this file for each change in Yarn's behavior. Use the sa
 
 ## Master
 
+- Makes running scripts with Plug'n Play possible on node 13
+
+  [#7650](https://github.com/yarnpkg/yarn/pull/7650) - [**Sander Verweij**](https://github.com/sverweij)
+
 - Change run command to check cwd/node_modules/.bin for commands. Fixes run in workspaces.
 
   [#7151](https://github.com/yarnpkg/yarn/pull/7151) - [**Jeff Valore**](https://twitter.com/codingwithspike)
 
+
 ## 1.19.1
 
 **Important:** This release contains a cache bump. It will cause the very first install following the upgrade to take slightly more time, especially if you don't use the [Offline Mirror](https://yarnpkg.com/blog/2016/11/24/offline-mirror/) feature. After that everything will be back to normal.

azure-pipelines.yml

@@ -13,6 +13,10 @@ jobs:
 #        node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml
@@ -30,6 +34,10 @@ jobs:
         node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml
@@ -47,6 +55,10 @@ jobs:
         node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml

src/util/generate-pnp-map-api.tpl.js

@@ -714,7 +714,7 @@ exports.setup = function setup() {
       return originalFindPath.call(Module, request, paths, isMain);
     }
 
-    for (const path of paths) {
+    for (const path of paths || []) {
       let resolution;
 
       try {