refactor: 模块化重构 generator 和 runtime

scripts/build-runtime.js

@@ -0,0 +1,62 @@
+const path = require('node:path');
+const fs = require('node:fs');
+
+function ensureDir(dirPath) {
+  if (!fs.existsSync(dirPath)) {
+    fs.mkdirSync(dirPath, { recursive: true });
+  }
+}
+
+async function main() {
+  let esbuild;
+  try {
+    esbuild = require('esbuild');
+  } catch (error) {
+    console.error('未找到 esbuild，请先执行 npm install。');
+    process.exitCode = 1;
+    return;
+  }
+
+  const projectRoot = path.resolve(__dirname, '..');
+  const entry = path.join(projectRoot, 'src', 'runtime', 'index.js');
+  const outFile = path.join(projectRoot, 'dist', 'script.js');
+
+  if (!fs.existsSync(entry)) {
+    console.error(`运行时入口不存在：${path.relative(projectRoot, entry)}`);
+    process.exitCode = 1;
+    return;
+  }
+
+  ensureDir(path.dirname(outFile));
+
+  try {
+    const result = await esbuild.build({
+      entryPoints: [entry],
+      outfile: outFile,
+      bundle: true,
+      platform: 'browser',
+      format: 'iife',
+      target: ['es2018'],
+      sourcemap: false,
+      minify: true,
+      legalComments: 'none',
+      metafile: true,
+      logLevel: 'info',
+    });
+
+    const outputs = result && result.metafile && result.metafile.outputs ? result.metafile.outputs : null;
+    const outKey = outputs ? Object.keys(outputs).find((k) => k.endsWith('dist/script.js')) : '';
+    const bytes = outKey && outputs && outputs[outKey] ? outputs[outKey].bytes : 0;
+    if (bytes) {
+      console.log(`✅ runtime bundle 完成：dist/script.js (${bytes} bytes)`);
+    } else {
+      console.log('✅ runtime bundle 完成：dist/script.js');
+    }
+  } catch (error) {
+    console.error('❌ runtime bundle 失败（禁止回退旧产物）：', error && error.message ? error.message : error);
+    process.exitCode = 1;
+  }
+}
+
+main();
+