Convert Makefile script to npm scripts

.github/workflows/node.js.yml

@@ -19,7 +19,7 @@ jobs:
         node-version:
           - 12 # to be removed 2022-04-30
           - 14 # to be removed 2023-04-30
-          - 15 # to be removed 2021-06-01
+          - 16 # to be removed 2024-04-30
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:

package.json

@@ -34,7 +34,15 @@
     "./": "./"
   },
   "scripts": {
-    "test": "make test"
+    "prebuild": "npm run clean",
+    "build": "browserify --bare --outfile chai.js --standalone chai --entry index.js",
+    "pretest": "npm run build",
+    "test": "npm run test-node && npm run test-chrome",
+    "test-node": "mocha --require ./test/bootstrap/index.js --reporter dot test/*.js test/*.mjs",
+    "test-chrome": "karma start karma.conf.js --single-run --browsers HeadlessChrome",
+    "test-firefox": "karma start karma.conf.js --browsers Firefox",
+    "test-cov": "istanbul cover ./node_modules/.bin/_mocha -- --require ./test/bootstrap/index.js test/*.js test/*.mjs",
+    "clean": "rm -f chai.js coverage"
   },
   "engines": {
     "node": ">=12"