【探讨】关于 vite 和 webpack 的分包优化的探讨
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This was referenced Jul 10, 2024
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diff --git a/dist/env.js b/dist/env.js
new file mode 100644
index 0000000000000000000000000000000000000000..364a5c722dd0774027e550899bc6eee9c8a04c4f
--- /dev/null
+++ b/dist/env.js
@@ -0,0 +1,22 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+ return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const path_1 = __importDefault(require("path"));
+const fs_1 = require("fs");
+const uni_cli_shared_1 = require("@dcloudio/uni-cli-shared");
+const platform = process.env.UNI_PLATFORM;
+const inputDir = process.env.UNI_INPUT_DIR;
+
+// #region 分包优化参数获取
+const manifestJson = (0, uni_cli_shared_1.parseManifestJsonOnce)(inputDir);
+const platformOptions = manifestJson[platform] || {};
+const optimization = platformOptions.optimization || {};
+process.env.UNI_OPT_TRACE = !!optimization.subPackages;
+
+const pagesJsonPath = path_1.default.resolve(inputDir, 'pages.json');
+const jsonStr = fs_1.readFileSync(pagesJsonPath, 'utf8');
+const { appJson } = (0, uni_cli_shared_1.parseMiniProgramPagesJson)(jsonStr, platform, { subpackages: true });
+process.UNI_SUBPACKAGES = appJson.subPackages || {};
+// #endregion
\ No newline at end of file
diff --git a/dist/index.js b/dist/index.js
index f343787fe9d9aa1ac97f15a91078814ce747f9ed..6795d4f25cedc4ca7408cbe530b5ac4aa5c0ca2e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1,5 +1,7 @@
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
+// 引入一个初始化环境变量的脚本
+require("./env");
const shared_1 = require("@vue/shared");
const uni_cli_shared_1 = require("@dcloudio/uni-cli-shared");
const plugin_1 = require("./plugin");
diff --git a/dist/plugin/build.js b/dist/plugin/build.js
index 47598739e43a1f8049b54fcd756411b42a5dc0af..61ac0227f4587def6bb28baae63ddc789341fe3d 100644
--- a/dist/plugin/build.js
+++ b/dist/plugin/build.js
@@ -91,9 +91,87 @@ function isVueJs(id) {
return id.includes('\0plugin-vue:export-helper');
}
const chunkFileNameBlackList = ['main', 'pages.json', 'manifest.json'];
+
+// #region subpackage
+const UNI_SUBPACKAGES = process.UNI_SUBPACKAGES || {};
+const subPkgsInfo = Object.values(UNI_SUBPACKAGES);
+const normalFilter = ({ independent }) => !independent;
+const independentFilter = ({ independent }) => independent;
+const map2Root = ({ root }) => root + '/';
+const subPackageRoots = subPkgsInfo.map(map2Root);
+const normalSubPackageRoots = subPkgsInfo.filter(normalFilter).map(map2Root);
+const independentSubpackageRoots = subPkgsInfo.filter(independentFilter).map(map2Root);
+
+// id处理器：将id中的moduleId转换为相对于inputDir的路径并去除查询参数后缀
+function moduleIdProcessor(id) {
+ let inputDir = (0, uni_cli_shared_1.normalizePath)(process.env.UNI_INPUT_DIR);
+ // 确保inputDir以斜杠结尾
+ if (!inputDir.endsWith('/')) {
+ inputDir += '/';
+ }
+
+ const normalized = (0, uni_cli_shared_1.normalizePath)(id);
+ const name = normalized.split('?')[0];
+ // 从name中剔除inputDir前缀
+ const updatedName = name.replace(inputDir, '');
+
+ return updatedName;
+}
+// 查找模块列表中是否有属于子包的模块
+const findSubPackages = function (importers) {
+ return importers.reduce((pkgs, item) => {
+ const pkgRoot = normalSubPackageRoots.find(root => moduleIdProcessor(item).indexOf(root) === 0);
+ pkgRoot && pkgs.add(pkgRoot);
+ return pkgs;
+ }, new Set())
+}
+// 判断是否有主包(是否被主包引用)
+const hasMainPackage = function (importers) {
+ return importers.some(item => {
+ return !subPackageRoots.some(root => moduleIdProcessor(item).indexOf(root) === 0);
+ })
+}
+// 判断该模块引用的模块是否有跨包引用的组件
+const hasMainPackageComponent = function (moduleInfo, subPackageRoot) {
+ if (moduleInfo.id && moduleInfo.importedIdResolutions) {
+ for (let index = 0; index < moduleInfo.importedIdResolutions.length; index++) {
+ const m = moduleInfo.importedIdResolutions[index];
+
+ if (m && m.id) {
+ const name = moduleIdProcessor(m.id);
+ // 判断是否为组件
+ if (
+ name.indexOf('.vue') !== -1 ||
+ name.indexOf('.nvue') !== -1
+ ) {
+ // 判断存在跨包引用的情况(该组件的引用路径不包含子包路径，就说明跨包引用了)
+ if (name.indexOf(subPackageRoot) === -1) {
+ if (process.env.UNI_OPT_TRACE) {
+ console.log('move module to main chunk:', moduleInfo.id,
+ 'from', subPackageRoot, 'for component in main package:', name)
+ }
+
+ // 独立分包除外
+ const independentRoot = independentSubpackageRoots.find(root => name.indexOf(root) >= 0)
+ if (!independentRoot) {
+ return true
+ }
+ }
+ } else {
+ return hasMainPackageComponent(m, subPackageRoot)
+ }
+ }
+ }
+ }
+ return false;
+}
+// #endregion
+
function createMoveToVendorChunkFn() {
const cache = new Map();
const inputDir = (0, uni_cli_shared_1.normalizePath)(process.env.UNI_INPUT_DIR);
+ const UNI_OPT_TRACE = process.env.UNI_OPT_TRACE === 'true' ? true : false;
+ console.log('分包优化开启状态:', UNI_OPT_TRACE);
return (id, { getModuleInfo }) => {
const normalizedId = (0, uni_cli_shared_1.normalizePath)(id);
const filename = normalizedId.split('?')[0];
@@ -114,6 +192,20 @@ function createMoveToVendorChunkFn() {
}
return;
}
+ if (UNI_OPT_TRACE) {
+ // 如果这个资源只属于一个子包，并且其调用组件的不存在跨包调用的情况，那么这个模块就会被加入到对应的子包中。
+ const moduleInfo = getModuleInfo(id) || {};
+ const importers = moduleInfo.importers || []; // 依赖当前模块的模块id
+ const matchSubPackages = findSubPackages(importers);
+ if (
+ matchSubPackages.size === 1 &&
+ !hasMainPackage(importers) &&
+ !hasMainPackageComponent(moduleInfo, matchSubPackages.values().next().value)
+ ) {
+ debugChunk(`${matchSubPackages.values().next().value}common/vendor`, normalizedId);
+ return `${matchSubPackages.values().next().value}common/vendor`;
+ }
+ }
// 非项目内的 js 资源，均打包到 vendor
debugChunk('common/vendor', normalizedId);
return 'common/vendor'; |
Otto-J
added
question
|
我原本写了一个简单的，参考博主的做了一些修改，已经用上了，感谢。 |
实现了插件化了哈，见这里的说明 |
|
m |
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引语
以下是uniapp2, 也就是基于webpack打包的vue2版本的分包优化策略的详细实现
uni-app/packages/vue-cli-plugin-uni/lib/split-chunks.js
Line 114 in fb00949
以下是基于vite打包的vue3版本的rollup的打包配置
uni-app/packages/uni-mp-vite/src/plugin/build.ts
Line 118 in 1c19012
问题
本人的项目(uniapp-vue3版本)在小程序这边的包大小已经到了一个瓶颈阶段，该分包的都分包了，公共组件也是尽可能的少了；
甚至魔改了uniapp的源码实现了小程序那边支持的异步分包功能，实现了主包异步引用分包组件的能力；
但是随着业务功能的增多，以上分包优化策略已不满足，小程序发版受到严重的影响，急需实现与vue2版本的分包优化一致功能。
探讨
本人研究了uniapp2版本的webpack的分包优化的具体实现，正在尝试对vite的分包优化进行实现（此工作正在进行中，突发奇想发个issue想知道官方有没有考虑这一块）。
不知官方对此处rollup的打包配置有没有什么指导性的建议，以实现与vue2版本的一样的分包优化的效果。
问题整理
https://github.com/Vanisper/uniapp-bundle-optimizer 我做的分包优化解决方案的一个整理，请阅读readme指引操作。
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