96 lines
3.4 KiB
JavaScript
96 lines
3.4 KiB
JavaScript
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/**
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* 微信小程序主包体积分析
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* 用法：先执行发行构建（微信小程序），再运行：node scripts/analyze-mp-main.js
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* 输出：主包总大小、超过 2MB 时告警、主包内大文件列表
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*/
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const fs = require('fs');
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const path = require('path');
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const BUILD_DIR = path.join(__dirname, '../unpackage/dist/build/mp-weixin');
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const MAIN_PACKAGE_LIMIT_KB = 2048;
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function getSubPackageRoots() {
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const appJsonPath = path.join(BUILD_DIR, 'app.json');
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if (!fs.existsSync(appJsonPath)) {
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console.error('未找到 app.json，请先执行：发行 -> 微信小程序');
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process.exit(1);
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}
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const app = JSON.parse(fs.readFileSync(appJsonPath, 'utf8'));
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let roots = (app.subPackages || []).map((p) => p.root);
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// 若构建产物尚未包含最新分包，则按源码 pages.json 补充（如 goods_cate）
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const pagesJsonPath = path.join(__dirname, '../pages.json');
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if (fs.existsSync(pagesJsonPath)) {
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let raw = fs.readFileSync(pagesJsonPath, 'utf8');
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// 只去掉行尾 // 注释（不删字符串内的 //）
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raw = raw.replace(/\s*\/\/[^\n"']*$/gm, '');
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try {
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const pagesJson = JSON.parse(raw);
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const subRoots = (pagesJson.subPackages || []).map((p) => p.root);
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subRoots.forEach((r) => {
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if (!roots.includes(r)) roots = roots.concat(r);
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});
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} catch (_) {}
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}
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return roots;
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}
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function isInMainPackage(filePath, subRoots) {
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const normalized = filePath.replace(BUILD_DIR + path.sep, '').replace(/\\/g, '/');
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for (const root of subRoots) {
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if (normalized === root || normalized.startsWith(root + '/')) return false;
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}
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return true;
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}
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function walkDir(dir, subRoots, list) {
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if (!fs.existsSync(dir)) return;
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const entries = fs.readdirSync(dir, { withFileTypes: true });
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for (const e of entries) {
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const full = path.join(dir, e.name);
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const rel = path.relative(BUILD_DIR, full).replace(/\\/g, '/');
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if (e.isDirectory()) {
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walkDir(full, subRoots, list);
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} else {
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if (!isInMainPackage(full, subRoots)) continue;
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try {
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const stat = fs.statSync(full);
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list.push({ path: rel, size: stat.size });
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} catch (_) {}
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}
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}
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}
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function main() {
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const subRoots = getSubPackageRoots();
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const files = [];
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walkDir(BUILD_DIR, subRoots, files);
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const totalBytes = files.reduce((s, f) => s + f.size, 0);
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const totalKB = Math.round(totalBytes / 1024);
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const totalMB = (totalBytes / 1024 / 1024).toFixed(2);
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console.log('========== 微信小程序主包体积分析 ==========\n');
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console.log('主包总大小:', totalKB, 'KB', '(' + totalMB + ' MB)');
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console.log('微信主包上限:', MAIN_PACKAGE_LIMIT_KB, 'KB (2 MB)\n');
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if (totalKB > MAIN_PACKAGE_LIMIT_KB) {
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console.log('⚠️ 主包超出限制', totalKB - MAIN_PACKAGE_LIMIT_KB, 'KB，需优化后再上传。\n');
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} else {
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console.log('✓ 主包未超限。\n');
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}
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const sorted = files.slice().sort((a, b) => b.size - a.size);
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console.log('主包内大文件（按体积排序，前 30）：');
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console.log('----------------------------------------');
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sorted.slice(0, 30).forEach((f) => {
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const kb = (f.size / 1024).toFixed(1);
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console.log(kb.padStart(8) + ' KB ' + f.path);
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});
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console.log('\n主包页面（来自 app.json）：');
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const app = JSON.parse(fs.readFileSync(path.join(BUILD_DIR, 'app.json'), 'utf8'));
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(app.pages || []).forEach((p) => console.log(' -', p));
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}
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main();
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