第五章webpack工程化-5节原理课程-day

Wck- wck在执行npxwck进行打包后，都干了什么事情((function(modules)varinstalledModules=functionck_require{if(installedModules[moduleId])return}varmodule=(installedModules[moduleId]{i:moduleId,l:false,exports:{}wwmodule.l=true;} ck_require((ck_require.s"./index.js":function(module,{'//importafrom"./a";\n\nconsole.log(" word");\n\n\n//#sourceURL=w "./a.js":function(module,{'//importafrom"./a";\n\nconsole.log(" word");\n\n\n//#sourceURL=w "./b.js":function(module,{'//importafrom"./a";\n\nconsole.log(" word");\n\n\n//#sourceURL=w }大概的意思就是，我们实现了一个wck_require来实现自己的模块wck配置文出创建一个wck哪些内容：wck启动函自己实现一个模块分析：文件，分析代constfs=constconstfenximokuai=filename=>constcontent=fs.readFileSync(filename,"utf-8"); npminstallnpminstall@babel/parser--constfs=constparser=constfenximokuai=filename=>constcontent=fs.readFileSync(filename,"utf-constAst={sourceType:npminstall@babel/traverse--constconstfs=require("fs");constpath=require("path");constparser=consttraverse=constfenximokuai=filename=>constconstcontent=fs.readFileSync(filename,"utf-constAst={sourceType:constdependencies=traverse(Ast,{ImportDeclaration({node{console.log(node);}文件引入的模块引入路在项目中里的可以在浏览器里执行的处理现在的路径问constparser=//修改dependenciesconstdependencies=constnewfilename="./"+path.join(path.dirname(filename),dependencies[node.source.valuenewfilename;把代码处理成浏览器可运行的代码，需要借助@babel/core@babel/preset-env，把ast语法树转换成合适的constbabel=const{code}=babel.transformFromAst(Ast,{presets:["@babel/preset-导出所有分析出的returnreturn完成代码constfs=require('fs');constpath=require('path');constparser=consttraverse=require('@babel/traverse').default;constbabel=require('@babel/core');const yser=(filename)=>constcontent=fs.readFileSync(filename,'utf-8');constast=parser.parse(content,{sourceType:constdependencies={};traverse(ast,{ImportDeclaration({node})constdirname=path.dirname(filename);constnewFile='./'+path.join(dirname,dependencies[node.source.value]=}const{code}=babel.transformFromAst(ast,{presets:["@babel/preset-{filename,}constconstmoduleInfo=}分析依块的分析：constfs=require('fs');constpath=require('path');constparser=consttraverse=require('@babel/traverse').default;constbabel=require('@babel/core');const yser=(filename)=>constcontent=fs.readFileSync(filename,'utf-8');constast=parser.parse(content,{sourceType:constdependencies={};traverse(ast,{ImportDeclaration({node})constdirname=path.dirname(filename);constnewFile='./'+path.join(dirname,dependencies[node.source.value]=}const{code}=babel.transformFromAst(ast,{presets:["@babel/preset-{filename,}}constmakeDependenciesGraph=(entry){constentryModule=module constgraphArray=[entryModule];for(leti=0;i<graphArray.length;{constitem=graphArray[i];const{dependencies}=item;if(dependencies){for(letjin{ }}}constgraph={};graphArray.forEach(item=>{graph[item.filename]{dependencies:item.dependencies,code:item.code}return}constgraghInfo=makeDependenciesGraph('./src/index.js');生成代constfs=require('fs');constpath=require('path');constparser=consttraverse=require('@babel/traverse').default;constbabel=require('@babel/core');const yser=(filename)=>constcontent=fs.readFileSync(filename,'utf-8');constast=parser.parse(content,{sourceType:constdependencies={};traverse(ast,{ImportDeclaration({node})constdirname=path.dirname(filename);constnewFile='./'+path.join(dirname,dependencies[node.source.value]=}const{code}=babel.transformFromAst(ast,{presets:["@babel/preset-{filename,}}constmakeDependenciesGraph=(entry){constentryModule=module constgraphArray=[entryModule];for(leti=0;i<graphArray.length;{constitem=graphArray[i];const{dependencies}=item;if(dependencies){for(letjin{ }}}constgraph={};graphArray.forEach(item=>{graph[item.filename]{dependencies:item.dependencies,code:item.code}return}constgenerateCode=(entry)=>constgraph=JSON.stringify(makeDependenciesGraph(entry));return`functionrequire(module)function{return}varexports={};(function(require,exports,code){})(localRequire,exports,graph[module].code);returnexports;}constconstcode=generateCode('./src/index.js');"debug":"node--inspect--inspect- 如何自己编写一个接口文档 创建一个替换源码中字符串的omodule.exports=console.log(source,this,this.query);returnsource.replace('kkb','开课吧') 在配置文件中使用constpath=require('path')module:{rules:{test:use:path.resolve(dirname,}] module:rules:{test:/\.js$/,use:[{loader:path.resolve(dirname,name:开课}}]}]//constloaderUtilsrequire("loader- module.exports=function(source)//returnsource.replace("kkb",);constoptions=loaderUtils.getOptions(this);constresult=source.replace("kkb",);returnsource.replace("kkb",);}this.callback:如何返回多个信息，不止是处理好的源码呢，可以使用constconstloaderUtilsrequire("loader- module.exports=function(source)constoptions=loaderUtils.getOptions(this);constresult=source.replace("kkb",);this.callback(null,result);:Error|content:string|Buffer,sourceMap?:SourceMap,meta?:anyconstconstloaderUtils=require("loader-module.exports=function(source)constoptions=loaderUtils.getOptions(this);setTimeout(()=>{constresult=source.replace("kkb",return},我们使 constconstloaderUtils=require("loader-//callback就是this.callbackconstcallback=this.async();setTimeout(()=>{constresult=source.replace("kkb",);callback(null,result);},module.exports=function(source)constoptions=module.exports=returnsource.replace("开课吧",constloaderUtils=require("loader-utils");module.exports=function(source){constoptions= constcallback=this.async();setTimeout(()=>{constresult=source.replace("kkb",);callback(null,result);}, module:{rules:{use:[path.resolve(dirname,{loader:path.resolve(dirname,name:开课}}]//use:[path.resolve(dirname,}]顺序，自下而上，自右resolveLoader:modules:["node_modules",{rules:{test:/\.js$/,use:[{loader:"