摘要：编写良好的模块提供了可靠的抽象和封装边界，构成了一致的设计和明确的目的。块此特定术语在内部用于管理捆绑过程。捆绑包由块组成，其中有几种类型例如入口和子。总结一个块是进程中的一组模块，一个是一个发出的块或一组块。
我们先看一下 compilation是什么？
是一个很大的对象
打印key值
[ "_pluginCompat", "hooks", "name", "compiler", "resolverFactory", "inputFileSystem", "requestShortener", "options", "outputOptions", "bail", "profile", "performance", "mainTemplate", "chunkTemplate", "hotUpdateChunkTemplate", "runtimeTemplate", "moduleTemplates", "semaphore", "entries", "_preparedEntrypoints", "entrypoints", "chunks", "chunkGroups", "namedChunkGroups", "namedChunks", "modules", "_modules", "cache", "records", "additionalChunkAssets", "assets", "errors", "warnings", "children", "dependencyFactories", "dependencyTemplates", "childrenCounters", "usedChunkIds", "usedModuleIds", "fileTimestamps", "contextTimestamps", "compilationDependencies", "_buildingModules", "_rebuildingModules"
我们看有熟悉的chunks，entries，options，
这些是Compilation定义的属性
const EntryModuleNotFoundError = require("./EntryModuleNotFoundError");
const ModuleNotFoundError = require("./ModuleNotFoundError");
const ModuleDependencyWarning = require("./ModuleDependencyWarning");
const ModuleDependencyError = require("./ModuleDependencyError");
const ChunkGroup = require("./ChunkGroup");
const Chunk = require("./Chunk");
const Entrypoint = require("./Entrypoint");
const MainTemplate = require("./MainTemplate");
const ChunkTemplate = require("./ChunkTemplate");
const HotUpdateChunkTemplate = require("./HotUpdateChunkTemplate");
const ModuleTemplate = require("./ModuleTemplate");
const RuntimeTemplate = require("./RuntimeTemplate");
const ChunkRenderError = require("./ChunkRenderError");
const AsyncDependencyToInitialChunkError = require("./AsyncDependencyToInitialChunkError");
const Stats = require("./Stats");
const Semaphore = require("./util/Semaphore");
const createHash = require("./util/createHash");
const Queue = require("./util/Queue");
const SortableSet = require("./util/SortableSet");
const GraphHelpers = require("./GraphHelpers");
const ModuleDependency = require("./dependencies/ModuleDependency");
const compareLocations = require("./compareLocations");
从这一堆的模块引入里，也可以猜出Compilation主要做了Modules变成Chunks编译的过程
里面有一些方法
1.对模块的处理，创建搜索添加构建/模块依赖处理，添加模块依赖，分类模块等
addModule/getModule/ findModule/buildModule/sortModules
2.对Chunk的处理，创建Chunk
3.哈希值
Compilation.prototype.applyPlugins
在原型上添加了applyPlugins方法
Compilation.js也是对Tapable 的拓展
主要处理Chunk、Module等
我们学习一下
webpack术语表定义模块：离散的功能块，提供比完整程序更小的表面积。编写良好的模块提供了可靠的抽象和封装边界，构成了一致的设计和明确的目的。
块：此Webpack特定术语在内部用于管理捆绑过程。捆绑包由块组成，其中有几种类型（例如入口和子）。通常，块直接与输出束相对应，但是，有些配置不会产生一对一的关系。
Bundle：由许多不同的模块生成，bundle包含已经过加载和编译过程的源文件的最终版本。
总结
a chunk is a group of modules within the webpack process, a bundle is an emitted chunk or set of chunks.
一个块是webpack进程中的一组模块，一个bundle是一个发出的块或一组块。
{
entry: {
foo: ["webpack/hot/only-dev-server.js","./src/foo.js"],
bar: ["./src/bar.js"]
},
output: {
path: "./dist",
filename: "[name].js"
}
}
Modules: "webpack/hot/only-dev-server.js", "./src/foo.js", "./src/bar.js" ( + any other modules that are dependencies of these entry points!)
Chunks: foo, bar
Bundles: foo, bar
通俗的解释一下，Modules是引入的模块，Chunks就是编译的模块，Bundles是提交的Chunks ，Chunks和Bundles是1:1的关系，配置map会有例外
总结Compilation主要做了Modules变成Chunks编译的过程
chunks不细看逻辑，好像太虚了，我们看一下this.chunks
它是一个数组,目前Chunk的长度是1，因为只是引入了一个模块
[ Chunk {
id: "main",
ids: [ "main" ],
debugId: 1000,
name: "main",
preventIntegration: false,
entryModule:
NormalModule {
dependencies: [],
blocks: [],
variables: [],
type: "javascript/auto",
context: "/Users/orion/Desktop/react-beauty-highcharts/src",
debugId: 1000,
hash: "a6388d29fa15bd58c6cffb10246992a5",
renderedHash: "a6388d29fa15bd58c6cf",
resolveOptions: {},
factoryMeta: {},
warnings: [],
errors: [],
buildMeta: [Object],
buildInfo: [Object],
reasons: [Array],
_chunks: [SortableSet],
id: "./src/index.js",
index: 0,
index2: 0,
depth: 0,
issuer: null,
profile: undefined,
prefetched: false,
built: true,
used: null,
usedExports: null,
optimizationBailout: [],
_rewriteChunkInReasons: undefined,
useSourceMap: true,
_source: [SourceMapSource],
request:
"/Users/orion/Desktop/react-beauty-highcharts/node_modules/babel-loader/lib/index.js!/Users/orion/Desktop/react-beauty-highcharts/src/index.js",
userRequest: "/Users/orion/Desktop/react-beauty-highcharts/src/index.js",
rawRequest: "./src/index.js",
binary: false,
parser: [Parser],
generator: JavascriptGenerator {},
resource: "/Users/orion/Desktop/react-beauty-highcharts/src/index.js",
matchResource: undefined,
loaders: [Array],
error: null,
_buildHash: "488efbd43aa05371d3f44d94c89abd57",
buildTimestamp: 1547884969828,
_cachedSources: Map {},
lineToLine: false,
_lastSuccessfulBuildMeta: [Object],
_ast: null },
_modules:
SortableSet [Set] {
[NormalModule],
_sortFn: [Function: sortByIdentifier],
_lastActiveSortFn: null,
_cache: undefined,
_cacheOrderIndependent: undefined },
filenameTemplate: undefined,
_groups:
SortableSet [Set] {
[Entrypoint],
_sortFn: [Function: sortChunkGroupById],
_lastActiveSortFn: null,
_cache: undefined,
_cacheOrderIndependent: undefined },
files: [],
rendered: false,
hash: "0988e8454f1915ec05fee482db8d0a6f",
contentHash: { javascript: "4b8695ca3c1d42e76c52" },
renderedHash: "0988e8454f1915ec05fe",
chunkReason: undefined,
extraAsync: false,
removedModules: undefined } ]
我们看到在entryModule下，记录了入口的绝对地址，相对地址，编译的hash，文件类型等信息
//文件写入，文件输出，文件缓存，里面具体的template.getRenderManifest，chunk.hasRuntime()，CachedSource具体的逻辑不能够一一的去研究详解，但是从名字能知道这个函数是做什么的
createChunkAssets() {
const outputOptions = this.outputOptions;
const cachedSourceMap = new Map();
/** @type {Map} */
const alreadyWrittenFiles = new Map();
for (let i = 0; i < this.chunks.length; i++) {
const chunk = this.chunks[i];
chunk.files = [];
let source;
let file;
let filenameTemplate;
try {
const template = chunk.hasRuntime()
? this.mainTemplate
: this.chunkTemplate;
const manifest = template.getRenderManifest({
chunk,
hash: this.hash,
fullHash: this.fullHash,
outputOptions,
moduleTemplates: this.moduleTemplates,
dependencyTemplates: this.dependencyTemplates
}); // [{ render(), filenameTemplate, pathOptions, identifier, hash }]
for (const fileManifest of manifest) {
const cacheName = fileManifest.identifier;
const usedHash = fileManifest.hash;
filenameTemplate = fileManifest.filenameTemplate;
file = this.getPath(filenameTemplate, fileManifest.pathOptions);
// check if the same filename was already written by another chunk
const alreadyWritten = alreadyWrittenFiles.get(file);
if (alreadyWritten !== undefined) {
if (alreadyWritten.hash === usedHash) {
if (this.cache) {
this.cache[cacheName] = {
hash: usedHash,
source: alreadyWritten.source
};
}
chunk.files.push(file);
this.hooks.chunkAsset.call(chunk, file);
continue;
} else {
throw new Error(
`Conflict: Multiple chunks emit assets to the same filename ${file}` +
` (chunks ${alreadyWritten.chunk.id} and ${chunk.id})`
);
}
}
if (
this.cache &&
this.cache[cacheName] &&
this.cache[cacheName].hash === usedHash
) {
source = this.cache[cacheName].source;
} else {
source = fileManifest.render();
// Ensure that source is a cached source to avoid additional cost because of repeated access
if (!(source instanceof CachedSource)) {
const cacheEntry = cachedSourceMap.get(source);
if (cacheEntry) {
source = cacheEntry;
} else {
const cachedSource = new CachedSource(source);
cachedSourceMap.set(source, cachedSource);
source = cachedSource;
}
}
if (this.cache) {
this.cache[cacheName] = {
hash: usedHash,
source
};
}
}
if (this.assets[file] && this.assets[file] !== source) {
throw new Error(
`Conflict: Multiple assets emit to the same filename ${file}`
);
}
this.assets[file] = source;
chunk.files.push(file);
this.hooks.chunkAsset.call(chunk, file);
alreadyWrittenFiles.set(file, {
hash: usedHash,
source,
chunk
});
}
} catch (err) {
this.errors.push(
new ChunkRenderError(chunk, file || filenameTemplate, err)
);
}
}
}
[ {
dependencies: [],
blocks: [],
variables: [],
type: "javascript/auto",
context: "/Users/orion/Desktop/react-beauty-highcharts/src",
debugId: 1000,
hash: "a6388d29fa15bd58c6cffb10246992a5",
renderedHash: "a6388d29fa15bd58c6cf",
resolveOptions: {},
factoryMeta: {},
warnings: [],
errors: [],
buildMeta: { providedExports: true },
buildInfo:
{ cacheable: true,
fileDependencies: [Set],
contextDependencies: Set {},
temporaryProvidedExports: false },
reasons: [ [ModuleReason] ],
_chunks:{
[Chunk],
_sortFn: [Function: sortById],
_lastActiveSortFn: null,
_cache: undefined,
_cacheOrderIndependent: undefined },
id: "./src/index.js",
index: 0,
index2: 0,
depth: 0,
issuer: null,
profile: undefined,
prefetched: false,
built: true,
used: null,
usedExports: null,
optimizationBailout: [],
_rewriteChunkInReasons: undefined,
useSourceMap: true,
_source:{
_value:
"module.exports = {
doubleLine: function doubleLine(arr) {
if (arr && !Array.isArray(arr)) {
console.error("the first params type must be Array");
return;
}
return {
credits: {
enabled: false // 禁用版权信息
},
chart: {
width: "400",
height: "400",
type: "area",
backgroundColor: {
linearGradient: [0, 0, 500, 500],
stops: [[0, "rgba(14, 8, 55,1)"], [1, "rgba(14, 8, 55,1)"]]
}
},
title: {
text: "",
style: {
color: "#a6aed2",
font: "bold 16px "Trebuchet MS", Verdana, sans-serif"
}
},
xAxis: {
categories: ["10:00", "10:30", "11:00", "11:30", "12:00", "12:30", "13:00", "13:30", "14:00", "14:30", "15:00", "15:30", "16:00", "16:30", "16:30", "17:00", "17:30", "18:00", "18:30", "19:00"],
labels: {
format: "{value} ",
style: {
color: "#746f95",
fontSize: "12px",
fontFamily: "微软雅黑"
}
},
maxPadding: 0.05,
showLastLabel: true,
// tickmarkPlacement:"on",
tickColor: "#746f95",
lineWidth: 1,
lineColor: "#746f95",
tickLength: 5,
minRange: 5,
tickInterval: 1 // 坐标轴刻度间隔为一星期
},
yAxis: {
gridLineWidth: "0px",
startOnTick: true,
endOnTick: false,
maxPadding: 0.35,
title: {
text: null
},
labels: {
// format: "{value} m",
style: {
color: "#746f95",
fontSize: "12px",
fontFamily: "微软雅黑"
}
},
lineWidth: 1,
lineColor: "#746f95"
},
legend: {
itemStyle: {
font: "9pt Trebuchet MS, Verdana, sans-serif",
color: "#a6aed2"
},
itemHoverStyle: {
color: "#fff"
}
},
tooltip: {
pointFormat: "{series.name}: {point.y:,.0f}人"
},
plotOptions: {
area: {
// pointStart: 1920,
marker: {
enabled: false,
symbol: "circle",
radius: 2,
states: {
hover: {
enabled: true
}
}
}
}
},
series: arr && arr[0] === "pink" ? [{
// data: [ 110, 235, 369, 640,
// 1005, 1436, 2063, 3057, 4618, 6444, 9822, 15468, 20434, 24126,
// 27387, 29459, 31056, 31982, 32040, 31233, 29224, 27342, 26662,
// 26956, 27912, 28999, 28965, 27826, 25579, 25722, 24826, 24605,
// 24304, 23464, 23708, 24099, 24357, 24237, 24401, 24344, 23586,
// 22380, 21004, 17287, 14747, 13076, 12555, 12144, 11009, 10950,
// 10871, 10824, 10577, 10527, 10475, 10421, 10358, 10295, 10104],
lineColor: "#e88eb3",
color: {
linearGradient: {
x1: 0,
x2: 0,
y1: 0,
y2: 1
},
stops: [[0, "rgba(231,142,179,0.8)"], [1, "rgba(135,56,89,0.5)"]]
},
fillOpacity: 0.5,
name: "进",
marker: {
enabled: false
} // threshold: null // 是否显示负数
}, {
// data: ,
lineColor: "#b946ff",
color: {
linearGradient: {
x1: 0,
x2: 0,
y1: 0,
y2: 1
},
stops: [[0, "rgba(152,60,210,0.8)"], [1, "rgba(65,25,90,0.35)"]]
},
fillOpacity: 0.5,
name: "出",
marker: {
enabled: false
},
threshold: null
}] : [{
// data: [ 110, 235, 369, 640,
// 1005, 1436, 2063, 3057, 4618, 6444, 9822, 15468, 20434, 24126,
// 27387, 29459, 31056, 31982, 32040, 31233, 29224, 27342, 26662,
// 26956, 27912, 28999, 28965, 27826, 25579, 25722, 24826, 24605,
// 24304, 23464, 23708, 24099, 24357, 24237, 24401, 24344, 23586,
// 22380, 21004, 17287, 14747, 13076, 12555, 12144, 11009, 10950,
// 10871, 10824, 10577, 10527, 10475, 10421, 10358, 10295, 10104],
lineColor: "#b946ff",
color: {
linearGradient: {
x1: 0,
x2: 0,
y1: 0,
y2: 1
},
stops: [[0, "rgba(152,60,210,0.8)"], [1, "rgba(65,25,90,0.35)"]]
},
fillOpacity: 0.5,
name: "进",
marker: {
enabled: false
} // threshold: null // 是否显示负数
}, {
// data: ,
lineColor: "#68d5ee",
color: {
linearGradient: {
x1: 0,
x2: 0,
y1: 0,
y2: 1
},
stops: [[0, "rgba(104,213,238,0.8)"], [1, "rgba(7,44,96,0.5)"]]
},
fillOpacity: 0.5,
name: "出",
marker: {
enabled: false
},
threshold: null
}]
};
},
columns: function columns() {
return {
credits: {
enabled: false
},
chart: {
type: "column",
backgroundColor: {
linearGradient: [0, 0, 500, 500],
stops: [[0, "rgb(14, 8, 55)"], [1, "rgb(14, 8, 55)"]]
}
},
title: {
text: "月平均降雨量",
style: {
color: "#a6aed2",
font: "bold 16px "Trebuchet MS", Verdana, sans-serif"
}
},
xAxis: {
gridLineWidth: "0px",
startOnTick: true,
endOnTick: false,
maxPadding: 0.35,
categories: ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"],
labels: {
format: "{value} ",
style: {
color: "#746f95",
fontSize: "12px",
fontFamily: "微软雅黑"
}
},
crosshair: true,
lineWidth: 1,
lineColor: "#746f95",
tickLength: 5,
tickColor: "#746f95"
},
yAxis: {
gridLineWidth: "0px",
startOnTick: true,
endOnTick: false,
maxPadding: 0.35,
min: 0,
labels: {
format: "{value} ",
style: {
color: "#746f95",
fontSize: "12px",
fontFamily: "微软雅黑"
}
},
title: {
// 平均时长 (min)
text: "",
style: {
color: "#746f95",
fontSize: "12px",
fontFamily: "微软雅黑"
}
},
lineWidth: 1,
lineColor: "#746f95"
},
tooltip: {
// head + 每个 point + footer 拼接成完整的 table
headerFormat: "{point.key}| {series.name}: | " + "{point.y} |
我们看到module的长度也是一个，一样有类型，路径，hash
其中
_source的_value下的module.exports，已经是略微压缩版的了，里面还有n
里面值得分析的还有很多，关于怎么压缩，压缩算法是怎么处理的，二次读源码再详解
周六快乐，刚刚抓娃娃机一个都没抓上，哈哈哈哈，但是我抓的激动开心啊
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