core: change build script to plain javascript

build/jest.js

@@ -0,0 +1,24 @@
+/* eslint-disable import/no-extraneous-dependencies */
+const spawn = require('cross-spawn');
+
+const args = ['jest', '--coverage'];
+const [, , argv2, argv3] = process.argv;
+
+if (argv2 && !argv2.startsWith('-')) {
+    args.push(argv2);
+    if (argv3 && !argv3.startsWith('-')) {
+        args.push('--collectCoverageFrom');
+        if (argv3.endsWith('.ts')) {
+            args.push(`**/${argv3}`);
+        } else {
+            args.push(`**/${argv3}/**/*.ts`);
+        }
+        args.push(...process.argv.slice(4));
+    } else {
+        args.push(...process.argv.slice(3));
+    }
+} else {
+    args.push('packages/.+\\.spec\\.ts', ...process.argv.slice(2));
+}
+
+spawn('npx', args, { stdio: 'inherit' });