fix: 兼容低版本 Node 启动预检

src/cli.ts

@@ -2,12 +2,19 @@
 
 // 必须放最前：Node 版本守卫，先于任何会用到全局 fetch 的模块求值
 import './lib/preflight.js';
-import { createProgram } from './lib/command.js';
-import { logger } from './utils/logger.js';
 
-// CLI 入口
-const program = createProgram();
-program.parseAsync(process.argv).catch((error) => {
-  logger.error(error instanceof Error ? error.message : String(error));
-  process.exit(1);
-});
+// CLI 入口依赖动态加载，确保低版本 Node 先执行 preflight 并给出可读提示
+Promise.all([import('./lib/command.js'), import('./utils/logger.js')])
+  .then(async ([{ createProgram }, { logger }]) => {
+    const program = createProgram();
+    try {
+      await program.parseAsync(process.argv);
+    } catch (error) {
+      logger.error(error instanceof Error ? error.message : String(error));
+      process.exit(1);
+    }
+  })
+  .catch((error) => {
+    console.error(error instanceof Error ? error.message : String(error));
+    process.exit(1);
+  });

src/lib/preflight.ts

@@ -1,9 +1,9 @@
 // 启动期前置检查：Node 版本守卫
 // 必须在任何会用到全局 fetch 的模块求值之前执行
 // 因为还在 i18n 初始化前，文案直接硬编码中英双语，避免循环依赖
-import { writeSync } from 'node:fs';
+import { writeSync } from 'fs';
 
-const major = Number.parseInt(process.versions.node.split('.')[0] ?? '0', 10);
+const major = Number.parseInt(process.versions.node.split('.')[0] || '0', 10);
 const MIN_MAJOR = 18;
 
 if (Number.isFinite(major) && major < MIN_MAJOR) {

tests/preflight-compat.test.mjs

@@ -0,0 +1,21 @@
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import test from 'node:test';
+
+test('preflight can be parsed by older Node before showing the version guard', () => {
+  const source = readFileSync(new URL('../dist/lib/preflight.js', import.meta.url), 'utf8');
+
+  assert.doesNotMatch(source, /\?\?/, 'preflight must not use nullish coalescing before the Node version guard runs');
+  assert.doesNotMatch(source, /\?\./, 'preflight must not use optional chaining before the Node version guard runs');
+  assert.doesNotMatch(source, /from ['"]node:/, 'preflight must not use node: imports before the Node version guard runs');
+});
+
+test('cli defers application imports until after preflight runs', () => {
+  const source = readFileSync(new URL('../dist/cli.js', import.meta.url), 'utf8');
+
+  assert.match(source, /import ['"]\.\/lib\/preflight\.js['"];/);
+  assert.doesNotMatch(source, /import \{ createProgram \} from ['"]\.\/lib\/command\.js['"];/);
+  assert.doesNotMatch(source, /import \{ logger \} from ['"]\.\/utils\/logger\.js['"];/);
+  assert.match(source, /import\(['"]\.\/lib\/command\.js['"]\)/);
+  assert.match(source, /import\(['"]\.\/utils\/logger\.js['"]\)/);
+});