Bundle all files to single JavaScript file, add development mode

rollup.dev.config.js

@@ -0,0 +1,15 @@
+import typescript from '@rollup/plugin-typescript';
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+import shebang from 'rollup-plugin-add-shebang';
+
+/** @type {import('rollup').RollupOptions} */
+const config = {
+    input: 'src/main.ts',
+    output: {
+        format: 'esm',
+        file: 'dist/wtc-dev.mjs',
+    },
+    plugins: [typescript(), nodeResolve({ exportConditions: ['node'] }), shebang({ include: 'dist/wtc-dev.mjs' })],
+};
+
+export default config;