1 line
33 KiB
JavaScript
1 line
33 KiB
JavaScript
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",(0,l.kt)("inlineCode",{parentName:"p"},"NormalModule.js")," \u4e2d\uff0c\u8c03\u7528 runLoaders \u8fd0\u884c loader\uff1a"),(0,l.kt)("pre",null,(0,l.kt)("code",{parentName:"pre",className:"language-js"},"runLoaders(\n {\n resource: this.resource, // \u8d44\u6e90\u6587\u4ef6\u7684\u8def\u5f84\uff0c\u53ef\u4ee5\u6709\u67e5\u8be2\u5b57\u7b26\u4e32\u3002\u5982\uff1a'./test.txt?query'\n loaders: this.loaders, // loader \u7684\u8def\u5f84\u3002\n context: loaderContext, // \u4f20\u9012\u7ed9 loader \u7684\u4e0a\u4e0b\u6587\n processResource: (loaderContext, resourcePath, callback) => {\n // \u83b7\u53d6\u8d44\u6e90\u7684\u65b9\u5f0f\uff0c\u6709 scheme \u7684\u6587\u4ef6\u901a\u8fc7 readResourceForScheme \u8bfb\u53d6\uff0c\u5426\u5219\u901a\u8fc7 fs.readFile \u8bfb\u53d6\u3002\n const resource = loaderContext.resource;\n const scheme = getScheme(resource);\n if (scheme) {\n hooks.readResourceForScheme\n .for(scheme)\n .callAsync(resource, this, (err, result) => {\n // ...\n return callback(null, result);\n });\n } else {\n loaderContext.addDependency(resourcePath);\n fs.readFile(resourcePath, callback);\n }\n },\n },\n (err, result) => {\n // \u5f53 loader \u8f6c\u6362\u5b8c\u6210\u540e\uff0c\u4f1a\u5c06\u7ed3\u679c\u8fd4\u56de\u5230 webpack \u4e2d\u7ee7\u7eed\u5904\u7406\u3002\n processResult(err, result.result);\n }\n);\n")),(0,l.kt)("p",null,"runLoaders \u51fd\u6570\u6765\u81ea ",(0,l.kt)("inlineCode",{parentName:"p"},"loader-runner")," \u5305\u3002\u5728\u4ecb\u7ecd runLoaders \u7684\u5177\u4f53\u6d41\u7a0b\u4e4b\u524d\uff0c\u5148\u4ecb\u7ecd\u4e00\u4e0b pitch \u9636\u6bb5\uff0c\u4e0a\u4e00\u8282\u4e2d\u6240\u8bb2\u7684\u8fd9\u79cd\u4ece\u540e\u5f80\u524d\u6267\u884c loader \u7684\u6d41\u7a0b\uff0c\u4e00\u822c\u53eb\u505a normal \u9636\u6bb5\u3002\u4e0e\u4e4b\u76f8\u5bf9\u7684\uff0c\u8fd8\u6709\u4e00\u79cd\u53eb\u505a pitch \u9636\u6bb5\u7684\u6d41\u7a0b\u3002"),(0,l.kt)("p",null,"\u4e00\u4e2a loader \u5982\u679c\u5728\u5bfc\u51fa\u7684\u51fd\u6570\u7684 pitch \u5c5e\u6027\u4e0a\u6302\u5728\u4e86\u65b9\u6cd5\uff0c\u90a3\u8fd9\u4e2a\u65b9\u6cd5\u5c06\u5728 pitch \u9636\u6bb5\u6267\u884c\u3002pitch \u9636\u6bb5\u4e0d\u540c\u4e8e normal \u9636\u6bb5\uff0cpitch \u9636\u6bb5\u7684\u6267\u884c\u987a\u5e8f\u662f\u4ece\u524d\u5f80\u540e\u7684\uff0c\u6574\u4e2a\u6d41\u7a0b\u7c7b\u4f3c\u6d4f\u89c8\u5668\u4e8b\u4ef6\u6a21\u578b\u6216\u6d0b\u8471\u6a21\u578b\uff0cpitch \u9636\u6bb5\u5148\u4ece\u524d\u5f80\u540e\u6267\u884c loader\uff0c\u7136\u540e\u518d\u8fdb\u5165 normal \u9636\u6bb5\u4ece\u540e\u5f80\u524d\u6267\u884c loader\u3002\u6ce8\u610f\uff0cpitch \u9636\u6bb5\u4e00\u822c\u4e0d\u8fd4\u56de\u503c\uff0c\u4e00\u65e6 pitch \u9636\u6bb5\u6709 loader \u8fd4\u56de\u503c\uff0c\u5219\u4ece\u8fd9\u91cc\u5f00\u59cb\u8fdb\u5165\u4ece\u540e\u5f80\u524d\u6267\u884c\u7684 normal \u9636\u6bb5\u3002"),(0,l.kt)("p",null,"loader-runner \u7684\u5177\u4f53\u6d41\u7a0b\u5982\u4e0b\uff1a"),(0,l.kt)("ol",null,(0,l.kt)("li",{parentName:"ol"},(0,l.kt)("p",{parentName:"li"},"\u5904\u7406\u4ece webpack \u63a5\u6536\u7684 context\uff0c\u7ee7\u7eed\u6dfb\u52a0\u5fc5\u8981\u7684\u5c5e\u6027\u548c\u8f85\u52a9\u65b9\u6cd5\u3002")),(0,l.kt)("li",{parentName:"ol"},(0,l.kt)("p",{parentName:"li"},"iteratePitchingLoaders \u5904\u7406 pitch loader\u3002"),(0,l.kt)("p",{parentName:"li"},"\u5982\u679c\u6211\u4eec\u7ed9\u4e00\u4e2a module \u914d\u7f6e\u4e86\u4e09\u4e2a loader\uff0c\u6bcf\u4e2a loader \u90fd\u914d\u7f6e\u4e86 pitch \u51fd\u6570\uff1a"),(0,l.kt)("pre",{parentName:"li"},(0,l.kt)("code",{parentName:"pre",className:"language-js"},'module.exports = {\n //...\n module: {\n rules: [\n {\n //...\n use: ["a-loader", "b-loader", "c-loader"],\n },\n ],\n },\n};\n')),(0,l.kt)("p",{parentName:"li"},"\u90a3\u4e48\u5904\u7406\u8fd9\u4e2a module \u7684\u6d41\u7a0b\u5982\u4e0b\uff1a"),(0,l.kt)("pre",{parentName:"li"},(0,l.kt)("code",{parentName:"pre",className:"language-shell"},"|- a-loader `pitch`\n |- b-loader `pitch`\n |- c-loader `pitch`\n |- requested module is picked up as a dependency\n |- c-loader normal execution\n |- b-loader normal execution\n|- a-loader normal execution\n")),(0,l.kt)("p",{parentName:"li"},"\u5982\u679c b-loader \u5728 pitch \u4e2d\u63d0\u524d\u8fd4\u56de\u4e86\u503c\uff0c\u90a3\u4e48\u6d41\u7a0b\u5982\u4e0b\uff1a"),(0,l.kt)("pre",{parentName:"li"},(0,l.kt)("code",{parentName:"pre",className:"language-shell"},"|- a-loader `pitch`\n |- b-loader `pitch` returns a module\n|- a-loader normal execution\n"))),(0,l.kt)("li",{parentName:"ol"},(0,l.kt)("p",{parentName:"li"},"iterateNormalLoaders \u5904\u7406 normal loader\u3002"),(0,l.kt)("p",{parentName:"li"},"\u5f53 pitch loader \u7684\u6d41\u7a0b\u5904\u7406\u5b8c\u540e\uff0c\u5c31\u6765\u5230\u4e86\u5904\u7406 normal loader \u7684\u6d41\u7a0b\u3002\u5904\u7406 normal loader \u7684\u6d41\u7a0b\u548c pitch loader \u76f8\u4f3c\uff0c\u53ea\u662f\u4ece\u540e\u5f80\u524d\u8fed\u4ee3\u3002"),(0,l.kt)("p",{parentName:"li"},"iterateNormalLoaders \u548c iteratePitchingLoaders \u90fd\u4f1a\u8c03\u7528 runSyncOrAsync \u6765\u6267\u884c loader\u3002runSyncOrAsync \u4f1a\u63d0\u4f9b context.async\uff0c\u8fd9\u662f\u4e00\u4e2a\u8fd4\u56de callback \u7684 async \u51fd\u6570\uff0c\u7528\u4e8e\u5f02\u6b65\u5904\u7406\u3002"))),(0,l.kt)("h3",{id:"3-\u5e38\u89c1-webpack-loader-\u539f\u7406\u89e3\u6790"},"3. \u5e38\u89c1 webpack loader \u539f\u7406\u89e3\u6790"),(0,l.kt)("p",null,"loader \u672c\u8eab\u7684\u64cd\u4f5c\u5e76\u4e0d\u590d\u6742\uff0c\u5c31\u662f\u4e00\u4e2a\u8d1f\u8d23\u8f6c\u6362\u5176\u4ed6\u8d44\u6e90\u5230 JavaScript \u6a21\u5757\u7684\u51fd\u6570\u3002"),(0,l.kt)("h4",{id:"31-raw-loader-\u5206\u6790"},"3.1 raw-loader \u5206\u6790"),(0,l.kt)("p",null,"\u8be5 loader 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const json = JSON.stringify(source)\n .replace(/\\u2028/g, "\\\\u2028")\n .replace(/\\u2029/g, "\\\\u2029");\n\n const esModule =\n typeof options.esModule !== "undefined" ? options.esModule : true;\n\n return `${esModule ? "export default" : "module.exports ="} ${json};`;\n}\n')),(0,l.kt)("h4",{id:"32-babel-loader-\u5206\u6790"},"3.2 babel-loader \u5206\u6790"),(0,l.kt)("p",null,"babel loader \u662f\u4e00\u4e2a\u7efc\u5408\u4e86\u540c\u6b65\u548c\u5f02\u6b65\u7684 loader\uff0c\u5728\u4f7f\u7528\u7f13\u5b58\u914d\u7f6e\u65f6\u4ee5\u5f02\u6b65\u6a21\u5f0f\u8fd0\u884c\uff0c\u5426\u5219\u4ee5\u540c\u6b65\u65b9\u5f0f\u8fd0\u884c\u3002\u8be5 loader \u7684\u4e3b\u8981\u6e90\u7801\u5982\u4e0b\uff1a"),(0,l.kt)("pre",null,(0,l.kt)("code",{parentName:"pre",className:"language-js"},"// imports ...\n// ...\n\nconst transpile = function (source, options) {\n // ...\n\n let result;\n try {\n result = babel.transform(source, options);\n } catch (error) {\n // ...\n }\n // ...\n\n return {\n code: code,\n map: map,\n metadata: metadata,\n };\n};\n\n// ...\n\nmodule.exports = function (source, inputSourceMap) {\n // ...\n\n if (cacheDirectory) {\n const callback = this.async();\n return cache(\n {\n directory: cacheDirectory,\n identifier: cacheIdentifier,\n source: source,\n options: options,\n transform: transpile,\n },\n (err, { code, map, metadata } = {}) => {\n if (err) return callback(err);\n\n metadataSubscribers.forEach((s) => passMetadata(s, this, metadata));\n\n return callback(null, code, map);\n }\n );\n }\n\n const { code, map, metadata } = transpile(source, options);\n\n this.callback(null, code, map);\n};\n")),(0,l.kt)("p",null,"babel-loader \u901a\u8fc7 callback \u4f20\u9012\u4e86\u7ecf\u8fc7 babel.transform \u8f6c\u6362\u540e\u7684\u4ee3\u7801\u53ca source map\u3002"),(0,l.kt)("h4",{id:"33-style-loader-\u4e0e-css-loader-\u5206\u6790"},"3.3 style-loader \u4e0e css-loader \u5206\u6790"),(0,l.kt)("p",null,"style-loader \u8d1f\u8d23\u5c06\u6837\u5f0f\u63d2\u5165\u5230 DOM \u4e2d\uff0c\u4f7f\u6837\u5f0f\u5bf9\u9875\u9762\u751f\u6548\u3002css-loader \u4e3b\u8981\u8d1f\u8d23\u5904\u7406 import\u3001url \u8def\u5f84\u7b49\u5916\u90e8\u5f15\u7528\u3002"),(0,l.kt)("p",null,"style-loader \u53ea\u6709 pitch \u51fd\u6570\u3002css-loader \u662f normal module\u3002\u6574\u4e2a\u6267\u884c\u6d41\u7a0b\u662f\u5148\u6267\u884c style-loader \u9636\u6bb5\uff0cstyle-loader \u4f1a\u521b\u5efa\u5f62\u5982 ",(0,l.kt)("inlineCode",{parentName:"p"},"require(!!./hzfe.css)")," \u7684\u4ee3\u7801\u8fd4\u56de\u7ed9 webpack\u3002webpack \u4f1a\u518d\u6b21\u8c03\u7528 css-loader \u5904\u7406\u6837\u5f0f\uff0ccss-loader \u4f1a\u8fd4\u56de\u5305\u542b runtime \u7684 js \u6a21\u5757\u7ed9 webpack \u53bb\u89e3\u6790\u3002style-loader \u5728\u4e0a\u4e00\u6b65\u6ce8\u5165 ",(0,l.kt)("inlineCode",{parentName:"p"},"require(!!./hzfe.css)")," \u7684\u540c\u65f6\uff0c\u4e5f\u6ce8\u5165\u4e86\u6dfb\u52a0 style \u6807\u7b7e\u7684\u4ee3\u7801\u3002\u8fd9\u6837\uff0c\u5728\u8fd0\u884c\u65f6\uff08\u6d4f\u89c8\u5668\u4e2d\uff09\uff0cstyle-loader \u5c31\u53ef\u4ee5\u628a css-loader \u7684\u6837\u5f0f\u63d2\u5165\u5230\u9875\u9762\u4e2d\u3002"),(0,l.kt)("p",null,"\u5e38\u89c1\u7684\u7591\u95ee\u5c31\u662f\u4e3a\u4ec0\u4e48\u4e0d\u6309\u7167 normal \u6a21\u5f0f\u7ec4\u7ec7 style-loader \u548c css-loader\u3002"),(0,l.kt)("p",null,"\u9996\u5148 css-loader \u8fd4\u56de\u7684\u662f\u5f62\u5982\u8fd9\u6837\u7684\u4ee3\u7801\uff1a"),(0,l.kt)("pre",null,(0,l.kt)("code",{parentName:"pre",className:"language-js"},'import ___CSS_LOADER_API_IMPORT___ from "../node_modules/_css-loader@5.1.3@css-loader/dist/runtime/api.js";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(function (i) {\n return i[1];\n});\n// Module\n___CSS_LOADER_EXPORT___.push([\n module.id,\n ".hzfe{\\r\\n height: 100px;\\r\\n}",\n "",\n]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n')),(0,l.kt)("p",null,"style-loader \u65e0\u6cd5\u5728\u7f16\u8bd1\u65f6\u83b7\u53d6 CSS \u76f8\u5173\u7684\u5185\u5bb9\uff0c\u56e0\u4e3a style-loader \u65e0\u6cd5\u5904\u7406 css-loader \u751f\u6210\u7ed3\u679c\u7684 runtime \u4f9d\u8d56\u3002style-loader \u4e5f\u65e0\u6cd5\u5728\u8fd0\u884c\u65f6\u83b7\u53d6 CSS \u76f8\u5173\u7684\u5185\u5bb9\uff0c\u56e0\u4e3a\u65e0\u8bba\u600e\u6837\u62fc\u63a5\u8fd0\u884c\u65f6\u4ee3\u7801\uff0c\u90fd\u65e0\u6cd5\u83b7\u53d6\u5230 CSS \u7684\u5185\u5bb9\u3002"),(0,l.kt)("p",null,"\u4f5c\u4e3a\u66ff\u4ee3\uff0cstyle-loader \u91c7\u7528\u4e86 pitch \u65b9\u6848\uff0cstyle-loader \u7684\u6838\u5fc3\u529f\u80fd\u5982\u4e0b\u6240\u793a\uff1a"),(0,l.kt)("pre",null,(0,l.kt)("code",{parentName:"pre",className:"language-js",metastring:'title="style-loader"',title:'"style-loader"'},'module.exports.pitch = function (request) {\n var result = [\n // \u751f\u6210 require CSS \u6587\u4ef6\u7684\u8bed\u53e5\uff0c\u4ea4\u7ed9 css-loader \u89e3\u6790 \u5f97\u5230\u5305\u542b CSS \u5185\u5bb9\u7684 JS \u6a21\u5757\n // \u5176\u4e2d !! 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