Add jest-bench benchmarking tool

Author: StefanH-AT

.gitignore

@@ -13,4 +13,7 @@ out
 tsconfig.tsbuildinfo
 
 # Jest coverage results
-coverage
+coverage
+
+# Jest-bench results
+benchmarks

bench.config.ts

@@ -0,0 +1,19 @@
+import config from "./jest.config"
+
+export default {
+    ...config,
+    // Jest-bench need its own test environment to function
+    "testEnvironment": "jest-bench/environment",
+    "testEnvironmentOptions": {
+        // still Jest-bench environment will run your environment if you specify it here
+        testEnvironment: "jest-environment-node",
+        "testEnvironmentOptions": {
+            // specify any option for your environment
+        }
+    },
+    // always include "default" reporter along with Jest-bench reporter
+    // for error reporting
+    "reporters": ["default", "jest-bench/reporter"],
+    // will pick up "*.bench.js" files or files in "__benchmarks__" folder.
+    "testRegex": "(/__benchmarks__/.*|\\.bench)\\.(ts|js)$"
+};

package-lock.json

@@ -38,6 +38,7 @@
         "compile": "tsc -p ./src",
         "watch": "tsc -watch -p ./src",
         "test": "jest --projects jest.config.ts",
+        "benchmark": "jest --projects bench.config.ts",
         "lint": "eslint ./src",
         "deploy": "vsce publish"
     },