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webpack 的 chunk #59

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huruji opened this issue Feb 14, 2019 · 0 comments
Open

webpack 的 chunk #59

huruji opened this issue Feb 14, 2019 · 0 comments

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@huruji
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huruji commented Feb 14, 2019

chunk 可以简单理解为 code spliting 出来的包,如果代码没有 code spliting 那么基本上可以认为对应于所输出的 bundle,webpack 1.0的文档中将 chunk 分为的三种类型,如下:

目前官方文档中�已经找不到这些描述了,/(ㄒoㄒ)/~~,不过可以在这两篇博文中看到�比较详细的解释

「前端」看懂前端脚手架你需要这篇webpack

webpack 进阶

我们在使用 webpack 的时候对于 chunk 比较关注的可能就是使用 �code spliting 和写插件的时候,code spliting 这个话题留到之后说,现在主要聊一聊写 webpack 插件时和 chunk 打交道的那些事儿。

webpack 插件的基本格式就是一个�含有 apply 方法的 JavaScript 的 class,这个在之前的文章中�已经比较完整的提到过了,需要参考�的可以看之前的文章:通过 Webpack 的 compiler 对象的 Hooks 学会编写 Webpack 插件的编写

我们在编写插件的时候可以通过 compilation 这个对象对 chunk 进行访问,compilation.chunks 即表示了这次编译的所有 chunks,可以看一个实例,简单的多入口配置 webpack 配置如下:

const config = {
    entry: {
        'index': path.join(__dirname, 'index.js'),
        'a': path.join(__dirname, 'a.css')
    },
    output: {
        filename: '[name].[hash].js',
        path: path.resolve(__dirname, 'dist')
    },
    module: {
        rules: [{
            test: /\.js$/,
            use: 'babel-loader'
        }, {
            test: /\.css$/,
            use: [MiniCssExtractPlugin.loader, 'css-loader']
        }]
    },
    plugins: [
        new cleanPlugin(),
        new MiniCssExtractPlugin({
            filename: '[name].css'
        }),
        new HtmlWebpackPlutin({
            template: path.resolve(__dirname, 'index.html')
        }),
        new ProgressBarPlugin(),
        new tablePlugin()
    ],

    devServer: {
        contentBase: path.join(__dirname, 'dist'),
        port: 10000
    },
    mode: 'development'
};

cleanPlugin 中将这次编译的 chunks 内容打印下来,如下:

const fs = require('fs')
const stringify = require('json-stringify-safe')

class cleanPlugin {
    constructor() {
        this.entriesWithNoJS = []
    }
    apply(compiler) {
        compiler.hooks.emit.tap('cleanPlugin', (compilation) => {
            const cache = []
            fs.writeFileSync('chunk.json', stringify(compilation.chunks, null, 2), {
                flag: 'w+'
            })
        })
    }
}

module.exports = cleanPlugin

json-stringify-safe 是为了解决 JSON.stringify 方法循环依赖的问题,类似的库还有 flattedcircular-json-es6

运行一下 webpack,打开 chunk.json 文件,这个文件的内容如下:

[
  {
    "id": "a",
    "ids": [
      "a"
    ],
    "debugId": 1004,
    "name": "a",
    "preventIntegration": false,
    "entryModule": {
      "dependencies": [
        {
          "module": {
            "dependencies": [],
            "blocks": [],
            "variables": [],
            "type": "css/mini-extract",
            "context": "/Users/huruji/Documents/webpac-plugin-test",
            "debugId": 1012,
            "hash": "08cf1f522d9d27c31e912691f4b31127",
            "renderedHash": "08cf1f522d9d27c31e91",
            "resolveOptions": {},
            "factoryMeta": {},
            "warnings": [],
            "errors": [],
            "buildMeta": {
              "providedExports": true
            },
            "buildInfo": {
              "temporaryProvidedExports": false
            },
            "reasons": [
              {
                "module": "[Circular ~.0.entryModule]",
                "dependency": "[Circular ~.0.entryModule.dependencies.0]",
                "_chunks": null
              }
            ],
            "_chunks": {},
            "id": "?7044",
            "index": 5,
            "index2": 3,
            "depth": 1,
            "issuer": "[Circular ~.0.entryModule]",
            "prefetched": false,
            "built": false,
            "used": null,
            "usedExports": null,
            "optimizationBailout": [],
            "useSourceMap": false,
            "_source": null,
            "_identifier": "/Users/huruji/Documents/webpac-plugin-test/node_modules/css-loader/dist/cjs.js!/Users/huruji/Documents/webpac-plugin-test/a.css",
            "_identifierIndex": 0,
            "content": "body {\n    background: red;\n    font-size: 12px;\n}",
            "media": ""
          },
          "weak": false,
          "optional": false,
          "identifier": "/Users/huruji/Documents/webpac-plugin-test/node_modules/css-loader/dist/cjs.js!/Users/huruji/Documents/webpac-plugin-test/a.css",
          "identifierIndex": 0,
          "content": "body {\n    background: red;\n    font-size: 12px;\n}",
          "media": "",
          "context": "/Users/huruji/Documents/webpac-plugin-test"
        }
      ],
      "blocks": [],
      "variables": [],
      "type": "javascript/auto",
      "context": "/Users/huruji/Documents/webpac-plugin-test",
      "debugId": 1002,
      "hash": "76982c2fb2ab3938a545c4a825da5089",
      "renderedHash": "76982c2fb2ab3938a545",
      "resolveOptions": {},
      "factoryMeta": {},
      "warnings": [],
      "errors": [],
      "buildMeta": {
        "providedExports": true
      },
      "buildInfo": {
        "cacheable": true,
        "fileDependencies": {},
        "contextDependencies": {},
        "temporaryProvidedExports": false
      },
      "reasons": [
        {
          "module": null,
          "dependency": {
            "module": "[Circular ~.0.entryModule]",
            "weak": false,
            "optional": false,
            "loc": {
              "name": "a"
            },
            "request": "/Users/huruji/Documents/webpac-plugin-test/a.css",
            "userRequest": "/Users/huruji/Documents/webpac-plugin-test/a.css"
          },
          "_chunks": null
        },
        {
          "module": {
            "dependencies": [
              {
                "module": null,
                "weak": false,
                "optional": false,
                "loc": {
                  "start": {
                    "line": -1,
                    "column": 0
                  },
                  "end": {
                    "line": -1,
                    "column": 0
                  },
                  "index": -3
                },
                "originModule": "[Circular ~.0.entryModule.reasons.1.module]"
              },
              {
                "module": null,
                "weak": false,
                "optional": false,
                "loc": {
                  "start": {
                    "line": -1,
                    "column": 0
                  },
                  "end": {
                    "line": -1,
                    "column": 0
                  },
                  "index": -2
                },
                "originModule": "[Circular ~.0.entryModule.reasons.1.module]"
              },
              {
                "module": null,
                "weak": false,
                "optional": false,
                "loc": {
                  "start": {
                    "line": 1,
                    "column": 0
                  },
                  "end": {
                    "line": 1,
                    "column": 20
                  }
                },
                "expression": "",
                "range": [
                  0,
                  20
                ]
              },
              {
                "module": {
                  "dependencies": [
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "start": {
                          "line": -1,
                          "column": 0
                        },
                        "end": {
                          "line": -1,
                          "column": 0
                        },
                        "index": -3
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.3.module]"
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "start": {
                          "line": -1,
                          "column": 0
                        },
                        "end": {
                          "line": -1,
                          "column": 0
                        },
                        "index": -2
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.3.module]"
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "index": -1
                      },
                      "range": [
                        15,
                        18
                      ],
                      "rangeStatement": [
                        0,
                        19
                      ]
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "index": -1
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.3.module]",
                      "range": [
                        15,
                        18
                      ],
                      "rangeStatement": [
                        0,
                        19
                      ],
                      "prefix": ""
                    }
                  ],
                  "blocks": [],
                  "variables": [],
                  "type": "javascript/auto",
                  "context": "/Users/huruji/Documents/webpac-plugin-test",
                  "debugId": 1011,
                  "hash": "8d6445f4bd840f5894be1a891f1c8ceb",
                  "renderedHash": "8d6445f4bd840f5894be",
                  "resolveOptions": {},
                  "factoryMeta": {},
                  "warnings": [],
                  "errors": [],
                  "buildMeta": {
                    "exportsType": "namespace",
                    "providedExports": [
                      "default"
                    ]
                  },
                  "buildInfo": {
                    "cacheable": true,
                    "fileDependencies": {},
                    "contextDependencies": {},
                    "strict": true,
                    "exportsArgument": "__webpack_exports__",
                    "temporaryProvidedExports": false
                  },
                  "reasons": [
                    {
                      "module": "[Circular ~.0.entryModule.reasons.1.module]",
                      "dependency": "[Circular ~.0.entryModule.reasons.1.module.dependencies.3]",
                      "_chunks": null
                    },
                    {
                      "module": "[Circular ~.0.entryModule.reasons.1.module]",
                      "dependency": {
                        "module": "[Circular ~.0.entryModule.reasons.1.module.dependencies.3.module]",
                        "weak": false,
                        "optional": false,
                        "loc": {
                          "start": {
                            "line": 2,
                            "column": 12
                          },
                          "end": {
                            "line": 2,
                            "column": 13
                          }
                        },
                        "request": "./a",
                        "userRequest": "./a",
                        "originModule": "[Circular ~.0.entryModule.reasons.1.module]",
                        "sourceOrder": 1,
                        "parserScope": {
                          "importVarMap": {}
                        },
                        "id": "default",
                        "name": "a",
                        "range": [
                          33,
                          34
                        ],
                        "strictExportPresence": false,
                        "namespaceObjectAsContext": false,
                        "directImport": true,
                        "shorthand": false
                      },
                      "_chunks": null
                    }
                  ],
                  "_chunks": {
                    "_lastActiveSortFn": null
                  },
                  "id": "./a.js",
                  "index": 1,
                  "index2": 0,
                  "depth": 1,
                  "issuer": "[Circular ~.0.entryModule.reasons.1.module]",
                  "prefetched": false,
                  "built": true,
                  "used": null,
                  "usedExports": null,
                  "optimizationBailout": [],
                  "useSourceMap": false,
                  "_source": {
                    "_value": "export default 123;",
                    "_name": "/Users/huruji/Documents/webpac-plugin-test/node_modules/babel-loader/lib/index.js!/Users/huruji/Documents/webpac-plugin-test/a.js"
                  },
                  "request": "/Users/huruji/Documents/webpac-plugin-test/node_modules/babel-loader/lib/index.js!/Users/huruji/Documents/webpac-plugin-test/a.js",
                  "userRequest": "/Users/huruji/Documents/webpac-plugin-test/a.js",
                  "rawRequest": "./a",
                  "binary": false,
                  "parser": {
                    "_pluginCompat": {
                      "_args": [
                        "options"
                      ],
                      "taps": [
                        {
                          "type": "sync",
                          "name": "Parser"
                        },
                        {
                          "type": "sync",
                          "name": "Tapable camelCase",
                          "stage": 100
                        },
                        {
                          "type": "sync",
                          "name": "Tapable this.hooks",
                          "stage": 200
                        }
                      ],
                      "interceptors": []
                    },
                    "hooks": {
                      "evaluateTypeof": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "evaluate": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "evaluateIdentifier": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "evaluateDefinedIdentifier": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "evaluateCallExpressionMember": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "statement": {
                        "_args": [
                          "statement"
                        ],
                        "taps": [],
                        "interceptors": [],
                        "_x": []
                      },
                      "statementIf": {
                        "_args": [
                          "statement"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "ConstPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "label": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "import": {
                        "_args": [
                          "statement",
                          "source"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyImportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": [],
                        "_x": [
                          null
                        ]
                      },
                      "importSpecifier": {
                        "_args": [
                          "statement",
                          "source",
                          "exportName",
                          "identifierName"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyImportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": [],
                        "_x": [
                          null
                        ]
                      },
                      "export": {
                        "_args": [
                          "statement"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": [],
                        "_x": [
                          null
                        ]
                      },
                      "exportImport": {
                        "_args": [
                          "statement",
                          "source"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "exportDeclaration": {
                        "_args": [
                          "statement",
                          "declaration"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "exportExpression": {
                        "_args": [
                          "statement",
                          "declaration"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": [],
                        "_x": [
                          null
                        ]
                      },
                      "exportSpecifier": {
                        "_args": [
                          "statement",
                          "identifierName",
                          "exportName",
                          "index"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "exportImportSpecifier": {
                        "_args": [
                          "statement",
                          "source",
                          "identifierName",
                          "exportName",
                          "index"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyExportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "varDeclaration": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "varDeclarationLet": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "varDeclarationConst": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "varDeclarationVar": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "canRename": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "rename": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "assigned": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "assign": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "typeof": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "importCall": {
                        "_args": [
                          "expression"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "ImportParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "call": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "callAnyMember": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "new": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "expression": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "expressionAnyMember": {
                        "_map": {},
                        "_interceptors": []
                      },
                      "expressionConditionalOperator": {
                        "_args": [
                          "expression"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "ConstPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "expressionLogicalOperator": {
                        "_args": [
                          "expression"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "ConstPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "program": {
                        "_args": [
                          "ast",
                          "comments"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyDetectionParserPlugin"
                          },
                          {
                            "type": "sync",
                            "name": "UseStrictPlugin"
                          }
                        ],
                        "interceptors": [],
                        "_x": [
                          null,
                          null
                        ]
                      },
                      "hotAcceptCallback": {
                        "_args": [
                          "expression",
                          "requests"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyImportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      },
                      "hotAcceptWithoutCallback": {
                        "_args": [
                          "expression",
                          "requests"
                        ],
                        "taps": [
                          {
                            "type": "sync",
                            "name": "HarmonyImportDependencyParserPlugin"
                          }
                        ],
                        "interceptors": []
                      }
                    },
                    "options": {},
                    "sourceType": "auto"
                  },
                  "generator": {},
                  "resource": "/Users/huruji/Documents/webpac-plugin-test/a.js",
                  "loaders": [
                    {
                      "loader": "/Users/huruji/Documents/webpac-plugin-test/node_modules/babel-loader/lib/index.js"
                    }
                  ],
                  "error": null,
                  "_buildHash": "9f7bf84b36cbd1e6ccc0fe4b5ce8f1f3",
                  "buildTimestamp": 1550127876994,
                  "_cachedSources": {},
                  "lineToLine": false,
                  "_lastSuccessfulBuildMeta": {
                    "exportsType": "namespace",
                    "providedExports": [
                      "default"
                    ]
                  },
                  "_ast": null
                },
                "weak": false,
                "optional": false,
                "loc": {
                  "start": {
                    "line": 1,
                    "column": 0
                  },
                  "end": {
                    "line": 1,
                    "column": 20
                  }
                },
                "request": "./a",
                "userRequest": "./a",
                "originModule": "[Circular ~.0.entryModule.reasons.1.module]",
                "sourceOrder": 1,
                "parserScope": {
                  "importVarMap": {}
                }
              },
              {
                "module": {
                  "dependencies": [
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "start": {
                          "line": -1,
                          "column": 0
                        },
                        "end": {
                          "line": -1,
                          "column": 0
                        },
                        "index": -3
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.4.module]"
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "start": {
                          "line": -1,
                          "column": 0
                        },
                        "end": {
                          "line": -1,
                          "column": 0
                        },
                        "index": -2
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.4.module]"
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "index": -1
                      },
                      "range": [
                        15,
                        18
                      ],
                      "rangeStatement": [
                        0,
                        19
                      ]
                    },
                    {
                      "module": null,
                      "weak": false,
                      "optional": false,
                      "loc": {
                        "index": -1
                      },
                      "originModule": "[Circular ~.0.entryModule.reasons.1.module.dependencies.4.module]",
                      "range": [
                        15,
                        18
                      ],
                      "rangeStatement": [
                        0,
                        19
                      ],
                      "prefix": ""
                    }
                  ],
                  "blocks": [],
                  "variables": [],
                  "type": "javascript/auto",
                  "context": "/Users/huruji/Documents/webpac-plugin-test",
                  "debugId": 1011,
                  "hash": "8d6445f4bd840f5894be1a891f1c8ceb",
                  "renderedHash": "8d6445f4bd840f5894be",
                  "resolveOptions": {},
                  "factoryMeta": {},
                  "warnings": [],
                  "errors": [],
                  "buildMeta": {
                    "exportsType": "namespace",
                    "providedExports": [
                      "default"
                    ]
                  },
                  "buildInfo": {
                    "cacheable": true,
                    "fileDependencies": {},
                    "contextDependencies": {},
                    "strict": true,
                    "exportsArgument": "__webpack_exports__",
                    "temporaryProvidedExports": false
                  },
                  "reasons": [
                    {
                      "module": "[Circular ~.0.entryModule.reasons.1.module]",
                      "dependency": {
                        "module": "[Circular ~.0.entryModule.reasons.1.module.dependencies.4.module]",
                        "weak": false,
                        "optional": false,
                        "loc": {
                          "start": {
                            "line": 1,
                            "column": 0
                          },
                          "end": {
                            "line": 1,
                            "column": 20
                          }
                        },
                        "request": "./a",
                        "userRequest": "./a",
                        "originModule": "[Circular ~.0.entryModule.reasons.1.module]",
                        "sourceOrder": 1,
                        "parserScope": {
                          "importVarMap": {}
                        }
                      },
                      "_chunks": null
                    },
                    {
                      "module": "[Circular ~.0.entryModule.reasons.1.module]",
                      "dependency": "[Circular ~.0.entryModule.reasons.1.module.dependencies.4]",
                      "_chunks": null
                    }
                  ],
                  "_chunks": {
                    "_lastActiveSortFn": null
                  },
                  "id": "./a.js",
                  "index": 1,
                  "index2": 0,
                  "depth": 1,
                  "issuer": "[Circular ~.0.entryModule.reasons.1.module]",
                  "prefetched": false,
                  "built": true,
                  "used": null,
                  "usedExports": null,
                  "optimizationBailout": [],
                  "useSourceMap": false,
                  "_source": {
                    "_value": "export default 123;",
                    "_name": "/Users/huruji/Documents/webpac-plugin-test/node_modules/babel-loader/lib/index.js!/Users/huruji/Documents/webpac-plugin-test/a.js"
                  },
                  "request": "/Users/huruji/Documents/webpac-plugin-test/node_modules/babel-loader/lib/index.js!/Users/huruji/Documents/webpac-plugin-test/a.js",
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]

7000+ 行数确实让人有点望而却步,不过整理一下,可以发现这个数组包含两个 chunk,显然这是符合我们预期的

将其中一个 chunk 的拆解来看,大概是一个含有 id 、 entryModule、files、各种哈希的一个对象,其中 files 可以理解为输出的这个 chunk 会输出的文件数组。

得益于 webpack 的开源以及合理的命名,我们可以在 webpack 的仓库中找到关于 chunk 的源码,https://github.com/webpack/webpack/blob/master/lib/Chunk.js

很容易发现 chunk 其实是一个 class 对象

通过 Object.getOwnProppertyNames 方法可以获取 class 的属性,如下:

compilation.chunks.forEach((chunk) => {
    fs.writeFileSync('chunk-methods.json', stringify(Object.getOwnPropertyNames(chunk.__proto__), null, 2), {
       flag: 'w+'
   })
})

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