Using build.js for maintenance

Fixed to exluding externals explicitely

Note previously used node_modules/* based on documentation but
that rewrite to relative paths which do not follow node
module resolution rules. evanw/esbuild#1958

build.js

@@ -0,0 +1,28 @@
+import { build } from 'esbuild'
+
+const watch = process.argv.includes('-w') || process.argv.includes('--watch')
+
+const options = {
+  entryPoints: ['./src/index.ts'],
+  outdir: './lib',
+  bundle: true,
+  format: 'esm',
+  platform: 'node',
+  target: ['es2020', 'node16'],
+  external: [
+    'yargs',
+    'rimraf',
+    'shelljs',
+    'tar',
+  ],
+  watch: !watch ? undefined : { 
+    onRebuild(error, result) {
+      if (error) console.error('watch build failed:', error)
+      else console.log('watch build succeeded:', result)
+    }
+  }
+}
+
+build(options).catch(() => process.exit(1))
+
+// esbuild src/index.ts --platform=node --format=esm --target=es2020,node14 --external:./node_modules/* --bundle --outdir=lib

package.json

@@ -16,8 +16,8 @@
   ],
   "type": "module",
   "scripts": {
-    "build": "esbuild src/index.ts --platform=node --format=esm --target=es2020,node14 --external:./node_modules/* --bundle --outdir=lib",
-    "build:watch": "npm run build -- --watch",
+    "build": "node build.js",
+    "build:watch": "node build.js --watch",
     "start": "node ./bin/aeppic-pack.js"
   },
   "repository": {