uniapp对微信小程序异步加载分包组件的做法--vite插件方案

微信原生文档见 文档
社区有方案,是在style中写入
这里的方案是使用vite插件,在编译完成后,对目标插件进行代码注入 (仅适用vue3 + vite) , 目前运行在uniapp 微信小程序上

目录结构:

/project-config  
      componentPlaceholder  
             componentPlaceholder.js  
      vite.uni-component-placeholder.js

vite插件代码

/**   
    实现了 uni编译完成后 , 处理 componentPlaceholder   

 */   
var fs = require('fs');  
var path = require('path');  

class ProcessComponentPlaceholder{  

    constructor(){  

        this.destFolder = process.env.UNI_OUTPUT_DIR;  

    }  

    process(){  
        let dev_fold = process.env.UNI_INPUT_DIR;  
        let dir = dev_fold+"/project-config/componentPlaceHolder/"  
        let files = fs.readdirSync(dir, 'utf-8');  
        let fileMap = {}  
        files.some((f) => {  
            let p = dir + "/" + f;  
            let stat = fs.lstatSync(p);  
            if (!stat.isDirectory()) {  
                fileMap[f] = p;  
            }  
        })  

        this.processNodes(fileMap)  

    }  

    processNodes(fileMap){  
        console.log("处理异步组件引用componentPlaceHolder",fileMap)  
        for(let jsonFileName in fileMap){  
            let path = fileMap[jsonFileName];  
            if(!path.lastIndexOf(".js")<0)continue;  
            let obj = require(path);  
            // console.log("读componentPlaceHolder", obj)  
            this.processOneConfig(obj);  
        }   
        console.table("componentPlaceHolder处理完毕")  
    }  

    processOneConfig(config){  
        for(let f in config){ //某个配置文件  
            let weixinJSONFile = this.destFolder+f+".json";  
            fs.readFile(weixinJSONFile,'utf8',(err, data)=>{  
                  if (err) {  
                    return console.log('componentPlaceHolder文件读取失败，失败原因是：' + err)  
                  }  
               let weixinJSON = JSON.parse(data);  
               // console.log("读componentPlaceHolder",weixinJSON);  

                //准备合并配置      
                let usingComponents = weixinJSON["usingComponents"]||{};  
                let componentPlaceholder = weixinJSON["componentPlaceholder"]||{};  
                let customConfig = config[f];  
                for(let tag in customConfig)   {  
                    let tagVal = customConfig[tag];  
                    let path = tagVal.path;  
                    let replace = tagVal.replace;  
                    // console.log(weixinJSONFile+ "  " +tag+" "+path )  
                    if(!usingComponents[tag]){  
                        usingComponents[tag]="../.."+path;  //这里的双层目录有必要可能动态算相对层级,根据项目自身情况而定  
                    }  
                    if(!componentPlaceholder[tag]){  
                        componentPlaceholder[tag] = replace;  
                    }  
                }  
                weixinJSON.usingComponents = usingComponents;  
                weixinJSON.componentPlaceholder = componentPlaceholder;  
               fs.writeFileSync(weixinJSONFile, JSON.stringify(weixinJSON,null,4))  

            }) ;  
        }  

    }  

}  

export default (options)=> {  
    var name = 'vite-plugin-copy-uniapp_config';  

    return {  
        name: name,  
        enforce: 'post',   
        closeBundle:()=>{  //buildEnd之后运行  
            options.forEach(function(option) {  

                    let processor =  new ProcessComponentPlaceholder();  
                     processor.process();  
            });  
        }  

    };  
}   

配置文件 componentPlaceholder.js 代码:

/**   
 配置：  

    {  
        "某个包的组件路径,不带.vue后缀"：{  
            "组件名,一般为文件名不带.vue和路径":{  
                path:"引用某个包的组件路径,不带.vue后缀",  
                replace:"未加载完成时的替换组件,比如view或某个全局组件"  
            }   
        }  
    }   
 */  
module.exports =  {   
    "/pages/index/index":{  
        "tabbar-me":{  
            path:"/package-my/pages/my/my",  
            replace:"view"  
        },   
    },  

}  

vite.config.js

import viteComponentPlaceHolder from "./project-config/vite.uni-component-placeholder.js"  

plugins.push(viteComponentPlaceHolder([{}]))  

export default defineConfig({  
    plugins   
});  

启动时会有日志
08:48:43.602 处理异步组件引用componentPlaceHolder {
08:48:43.609 'componentPlaceholder.js': '/project-config/componentPlaceHolder//componentPlaceholder.js'
08:48:43.610 }