Question

我将项目升级到Angular 8版本。在升级过程中，我没有遇到任何错误。但是编译时间增加了3倍，没有任何错误。至少，如何获得旧的编译时间？

Last Compile Before Angular 8  (with Angular 7.2)
Time: 1382.536ms -> main.cf29a89468d732f3f363.js (main) 12.4 MB 

First Compile After Upgrading to Angular 8
Time: 6379.317ms -> main.da4147c72278bc767ee4.js (main) 12.3 MB 

Second Compile After Upgrading to Angular 8 and After restart PC 
Time: 3147.254ms -> main.da4147c72278bc767ee4.js (main) 12.3 MB

tsconfig.json

    {
     "compileOnSave": false,
     "compilerOptions": {
        "baseUrl": "",
        "declaration": false,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "mapRoot": "./",
        "moduleResolution": "node",
        "outDir": "../__dist_cli",
        "sourceMap": true, 
        "target": "es5 ", 
        "module": "es2015",
        "lib": [
            "es2016",
            "dom"
        ],
        "typeRoots": [
            "node_modules/@types",
            "typings/custom"
        ]
    }

Angular CLI: 8.0.0
Node: 12.3.1
OS: win32 x64
Angular: 8.0.0

Answer 1

尝试使用命令构建软件包

ng build --es5BrowserSupport=false

这将只为现代浏览器生成软件包。这将帮助您确定差异装载包装的建造是否花费了额外的时间。

Answer 2

此问题在Angular CLI的更新版本（^ 8.2.1）中得以解决

将项目从Angular 7.2升级到Angular 8后，编译时间增加了3倍。我该如何解决

2 个答案: