Avoid unnecessary yarn install runs

1 files changed, 33 insertions, 0 deletions

diff --git a/build.gradle b/build.gradle
index 4c67c8dd4d8..6c4d916ca5d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -666,3 +666,36 @@ dependencyUpdates {
     rejected
   }
 }
+
+// Hack to avoid unecessary yarn install.
+// This will create a avoidInstallTask task on which both installTask & runTask will depend.
+// installTask is disabled and will only be activated by avoidInstallTask when it is executed
+// Because it is set to share the same dependencies, avoidInstallTask will be executed only if
+// the runTask will be executed
+ext.avoidYarnInstallIfPossible = { taskList, installTask, runTask -> 
+  // Disable the yarn install task
+  installTask.enabled = false;
+
+  def avoidInstallTask = taskList.register('avoidInstallTask_' + runTask.name) {
+    // Copy all inputs and outputs
+    runTask.inputs.getFiles().each { fi -> 
+      if (fi.isDirectory()) inputs.dir(fi)
+      else inputs.file(fi)
+    }
+    runTask.outputs.getFiles().each { fi -> 
+      if (fi.isDirectory()) outputs.dir(fi)
+      else outputs.file(fi)
+    }
+
+    outputs.cacheIf { true }
+
+    // Activate the yarn install task
+    doLast {
+      installTask.enabled = true
+    }
+  }
+
+  runTask.dependsOn(installTask)
+  runTask.dependsOn(avoidInstallTask)
+  installTask.dependsOn(avoidInstallTask)
+}
\ No newline at end of file