fix(cdk-graph-plugin-diagram): reduce jest concurrency

aws · Jan 24, 2023 · dd3bf69 · dd3bf69
1 parent 17f0a9d
commit dd3bf69
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Showing 2 changed files with 20 additions and 10 deletions.
diff --git a/packages/cdk-graph-plugin-diagram/package.json b/packages/cdk-graph-plugin-diagram/package.json
@@ -185,7 +185,9 @@
       "ts-jest": {
         "tsconfig": "tsconfig.dev.json"
       }
-    }
+    },
+    "maxWorkers": "25%",
+    "maxConcurrency": 2
   },
   "types": "lib/index.d.ts",
   "stability": "experimental",

diff --git a/private/projects/cdk-graph-plugin-diagram.ts b/private/projects/cdk-graph-plugin-diagram.ts
@@ -80,15 +80,23 @@ export class CdkGraphPluginDiagramProject extends CdkGraphPluginProject {
 
     this.postCompileTask.prependSpawn(copyFilesTask);
 
-    this.jest?.addIgnorePattern("/\\.tmp/");
-    this.jest?.addIgnorePattern("/__\\w+__/");
-    this.jest?.addWatchIgnorePattern("/\\.tmp/");
+    if (this.jest) {
+      this.jest.addIgnorePattern("/\\.tmp/");
+      this.jest.addIgnorePattern("/__\\w+__/");
+      this.jest.addWatchIgnorePattern("/\\.tmp/");
 
-    // https://www.npmjs.com/package/jest-image-snapshot
-    this.jest?.addReporter(
-      "jest-image-snapshot/src/outdated-snapshot-reporter.js"
-    );
-    this.testTask.env("JEST_IMAGE_SNAPSHOT_TRACK_OBSOLETE", "1");
-    this.addGitIgnore(".jest-image-snapshot-touched-files");
+      // Tests in this package consume a lot of memory and compute; reducing concurrency to limit effects
+      // https://jestjs.io/docs/27.x/configuration#maxworkers-number--string
+      this.jest.config.maxWorkers = "25%";
+      // https://jestjs.io/docs/27.x/configuration#maxconcurrency-number
+      this.jest.config.maxConcurrency = 2;
+
+      // https://www.npmjs.com/package/jest-image-snapshot
+      this.jest.addReporter(
+        "jest-image-snapshot/src/outdated-snapshot-reporter.js"
+      );
+      this.testTask.env("JEST_IMAGE_SNAPSHOT_TRACK_OBSOLETE", "1");
+      this.addGitIgnore(".jest-image-snapshot-touched-files");
+    }
   }
 }