源碼

// index.js 入口文件

require('./main.css');

module.exports = {
  name: 'index'
}

// main.css
body {
  background: red;
}

// webpack config

 module: {
    rules: [{
      test: /\.txt/,
      use: 'raw-loader'
    }, {
      test: /\.js/,
      use: 'babel-loader'
    }, 
    {
      test: /\.css$/,
      use: ['style-loader', 'css-loader']
    }]
  }
 

打包後的代碼

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/***/ "./node_modules/[email protected]@css-loader/dist/cjs.js!./src/main.css":
/*!******************************************************************************!*  !*** ./node_modules/[email protected]@css-loader/dist/cjs.js!./src/main.css ***!
  \******************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
console.log(3)
eval("exports = module.exports = __webpack_require__(/*! ../node_modules/[email protected]@css-loader/dist/runtime/api.js */ \"./node_modules/[email protected]@css-loader/dist/runtime/api.js\")(false);\n// Module\nexports.push([module.i, \"body {\\n  background: red;\\n}\", \"\"]);\n\n\n\n//# sourceURL=webpack:///./src/main.css?./node_modules/[email protected]@css-loader/dist/cjs.js");

/***/ }),

/***/ "./node_modules/[email protected]@css-loader/dist/runtime/api.js":
/*!***********************************************************************!*  !*** ./node_modules/[email protected]@css-loader/dist/runtime/api.js ***!
  \***********************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
console.log(4)
"use strict";
eval("\n/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n*/\n// css base code, injected by the css-loader\n\nmodule.exports = function (useSourceMap) {\n  var list = []; // return the list of modules as css string\n\n  list.toString = function toString() {\n    return this.map(function (item) {\n      var content = cssWithMappingToString(item, useSourceMap);\n\n      if (item[2]) {\n        return '@media ' + item[2] + '{' + content + '}';\n      } else {\n        return content;\n      }\n    }).join('');\n  }; // import a list of modules into the list\n\n\n  list.i = function (modules, mediaQuery) {\n    if (typeof modules === 'string') {\n      modules = [[null, modules, '']];\n    }\n\n    var alreadyImportedModules = {};\n\n    for (var i = 0; i < this.length; i++) {\n      var id = this[i][0];\n\n      if (id != null) {\n        alreadyImportedModules[id] = true;\n      }\n    }\n\n    for (i = 0; i < modules.length; i++) {\n      var item = modules[i]; // skip already imported module\n      // this implementation is not 100% perfect for weird media query combinations\n      // when a module is imported multiple times with different media queries.\n      // I hope this will never occur (Hey this way we have smaller bundles)\n\n      if (item[0] == null || !alreadyImportedModules[item[0]]) {\n        if (mediaQuery && !item[2]) {\n          item[2] = mediaQuery;\n        } else if (mediaQuery) {\n          item[2] = '(' + item[2] + ') and (' + mediaQuery + ')';\n        }\n\n        list.push(item);\n      }\n    }\n  };\n\n  return list;\n};\n\nfunction cssWithMappingToString(item, useSourceMap) {\n  var content = item[1] || '';\n  var cssMapping = item[3];\n\n  if (!cssMapping) {\n    return content;\n  }\n\n  if (useSourceMap && typeof btoa === 'function') {\n    var sourceMapping = toComment(cssMapping);\n    var sourceURLs = cssMapping.sources.map(function (source) {\n      return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */';\n    });\n    return [content].concat(sourceURLs).concat([sourceMapping]).join('\\n');\n  }\n\n  return [content].join('\\n');\n} // Adapted from convert-source-map (MIT)\n\n\nfunction toComment(sourceMap) {\n  // eslint-disable-next-line no-undef\n  var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))));\n  var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;\n  return '/*# ' + data + ' */';\n}\n\n//# sourceURL=webpack:///./node_modules/[email protected]@css-loader/dist/runtime/api.js?");

/***/ }),

/***/ "./node_modules/[email protected]@style-loader/lib/addStyles.js":
/*!*************************************************************************!*  !*** ./node_modules/[email protected]@style-loader/lib/addStyles.js ***!
  \*************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

eval("/*\n\tMIT License http://www.opensource.org/licenses/mit-license.php\n\tAuthor Tobias Koppers @sokra\n*/\n\nvar stylesInDom = {};\n\nvar\tmemoize = function (fn) {\n\tvar memo;\n\n\treturn function () {\n\t\tif (typeof memo === \"undefined\") memo = fn.apply(this, arguments);\n\t\treturn memo;\n\t};\n};\n\nvar isOldIE = memoize(function () {\n\t// Test for IE <= 9 as proposed by Browserhacks\n\t// @see http://browserhacks.com/#hack-e71d8692f65334173fee715c222cb805\n\t// Tests for existence of standard globals is to allow style-loader\n\t// to operate correctly into non-standard environments\n\t// @see https://github.com/webpack-contrib/style-loader/issues/177\n\treturn window && document && document.all && !window.atob;\n});\n\nvar getTarget = function (target, parent) {\n  if (parent){\n    return parent.querySelector(target);\n  }\n  return document.querySelector(target);\n};\n\nvar getElement = (function (fn) {\n\tvar memo = {};\n\n\treturn function(target, parent) {\n                // If passing function in options, then use it for resolve \"head\" element.\n                // Useful for Shadow Root style i.e\n                // {\n                //   insertInto: function () { return document.querySelector(\"#foo\").shadowRoot }\n                // }\n                if (typeof target === 'function') {\n                        return target();\n                }\n                if (typeof memo[target] === \"undefined\") {\n\t\t\tvar styleTarget = getTarget.call(this, target, parent);\n\t\t\t// Special case to return head of iframe instead of iframe itself\n\t\t\tif (window.HTMLIFrameElement && styleTarget instanceof window.HTMLIFrameElement) {\n\t\t\t\ttry {\n\t\t\t\t\t// This will throw an exception if access to iframe is blocked\n\t\t\t\t\t// due to cross-origin restrictions\n\t\t\t\t\tstyleTarget = styleTarget.contentDocument.head;\n\t\t\t\t} catch(e) {\n\t\t\t\t\tstyleTarget = null;\n\t\t\t\t}\n\t\t\t}\n\t\t\tmemo[target] = styleTarget;\n\t\t}\n\t\treturn memo[target]\n\t};\n})();\n\nvar singleton = null;\nvar\tsingletonCounter = 0;\nvar\tstylesInsertedAtTop = [];\n\nvar\tfixUrls = __webpack_require__(/*! ./urls */ \"./node_modules/[email protected]@style-loader/lib/urls.js\");\n\nmodule.exports = function(list, options) {\n\tif (typeof DEBUG !== \"undefined\" && DEBUG) {\n\t\tif (typeof document !== \"object\") throw new Error(\"The style-loader cannot be used in a non-browser environment\");\n\t}\n\n\toptions = options || {};\n\n\toptions.attrs = typeof options.attrs === \"object\" ? options.attrs : {};\n\n\t// Force single-tag solution on IE6-9, which has a hard limit on the # of <style>\n\t// tags it will allow on a page\n\tif (!options.singleton && typeof options.singleton !== \"boolean\") options.singleton = isOldIE();\n\n\t// By default, add <style> tags to the <head> element\n        if (!options.insertInto) options.insertInto = \"head\";\n\n\t// By default, add <style> tags to the bottom of the target\n\tif (!options.insertAt) options.insertAt = \"bottom\";\n\n\tvar styles = listToStyles(list, options);\n\n\taddStylesToDom(styles, options);\n\n\treturn function update (newList) {\n\t\tvar mayRemove = [];\n\n\t\tfor (var i = 0; i < styles.length; i++) {\n\t\t\tvar item = styles[i];\n\t\t\tvar domStyle = stylesInDom[item.id];\n\n\t\t\tdomStyle.refs--;\n\t\t\tmayRemove.push(domStyle);\n\t\t}\n\n\t\tif(newList) {\n\t\t\tvar newStyles = listToStyles(newList, options);\n\t\t\taddStylesToDom(newStyles, options);\n\t\t}\n\n\t\tfor (var i = 0; i < mayRemove.length; i++) {\n\t\t\tvar domStyle = mayRemove[i];\n\n\t\t\tif(domStyle.refs === 0) {\n\t\t\t\tfor (var j = 0; j < domStyle.parts.length; j++) domStyle.parts[j]();\n\n\t\t\t\tdelete stylesInDom[domStyle.id];\n\t\t\t}\n\t\t}\n\t};\n};\n\nfunction addStylesToDom (styles, options) {\n\tfor (var i = 0; i < styles.length; i++) {\n\t\tvar item = styles[i];\n\t\tvar domStyle = stylesInDom[item.id];\n\n\t\tif(domStyle) {\n\t\t\tdomStyle.refs++;\n\n\t\t\tfor(var j = 0; j < domStyle.parts.length; j++) {\n\t\t\t\tdomStyle.parts[j](item.parts[j]);\n\t\t\t}\n\n\t\t\tfor(; j < item.parts.length; j++) {\n\t\t\t\tdomStyle.parts.push(addStyle(item.parts[j], options));\n\t\t\t}\n\t\t} else {\n\t\t\tvar parts = [];\n\n\t\t\tfor(var j = 0; j < item.parts.length; j++) {\n\t\t\t\tparts.push(addStyle(item.parts[j], options));\n\t\t\t}\n\n\t\t\tstylesInDom[item.id] = {id: item.id, refs: 1, parts: parts};\n\t\t}\n\t}\n}\n\nfunction listToStyles (list, options) {\n\tvar styles = [];\n\tvar newStyles = {};\n\n\tfor (var i = 0; i < list.length; i++) {\n\t\tvar item = list[i];\n\t\tvar id = options.base ? item[0] + options.base : item[0];\n\t\tvar css = item[1];\n\t\tvar media = item[2];\n\t\tvar sourceMap = item[3];\n\t\tvar part = {css: css, media: media, sourceMap: sourceMap};\n\n\t\tif(!newStyles[id]) styles.push(newStyles[id] = {id: id, parts: [part]});\n\t\telse newStyles[id].parts.push(part);\n\t}\n\n\treturn styles;\n}\n\nfunction insertStyleElement (options, style) {\n\tvar target = getElement(options.insertInto)\n\n\tif (!target) {\n\t\tthrow new Error(\"Couldn't find a style target. This probably means that the value for the 'insertInto' parameter is invalid.\");\n\t}\n\n\tvar lastStyleElementInsertedAtTop = stylesInsertedAtTop[stylesInsertedAtTop.length - 1];\n\n\tif (options.insertAt === \"top\") {\n\t\tif (!lastStyleElementInsertedAtTop) {\n\t\t\ttarget.insertBefore(style, target.firstChild);\n\t\t} else if (lastStyleElementInsertedAtTop.nextSibling) {\n\t\t\ttarget.insertBefore(style, lastStyleElementInsertedAtTop.nextSibling);\n\t\t} else {\n\t\t\ttarget.appendChild(style);\n\t\t}\n\t\tstylesInsertedAtTop.push(style);\n\t} else if (options.insertAt === \"bottom\") {\n\t\ttarget.appendChild(style);\n\t} else if (typeof options.insertAt === \"object\" && options.insertAt.before) {\n\t\tvar nextSibling = getElement(options.insertAt.before, target);\n\t\ttarget.insertBefore(style, nextSibling);\n\t} else {\n\t\tthrow new Error(\"[Style Loader]\\n\\n Invalid value for parameter 'insertAt' ('options.insertAt') found.\\n Must be 'top', 'bottom', or Object.\\n (https://github.com/webpack-contrib/style-loader#insertat)\\n\");\n\t}\n}\n\nfunction removeStyleElement (style) {\n\tif (style.parentNode === null) return false;\n\tstyle.parentNode.removeChild(style);\n\n\tvar idx = stylesInsertedAtTop.indexOf(style);\n\tif(idx >= 0) {\n\t\tstylesInsertedAtTop.splice(idx, 1);\n\t}\n}\n\nfunction createStyleElement (options) {\n\tvar style = document.createElement(\"style\");\n\n\tif(options.attrs.type === undefined) {\n\t\toptions.attrs.type = \"text/css\";\n\t}\n\n\tif(options.attrs.nonce === undefined) {\n\t\tvar nonce = getNonce();\n\t\tif (nonce) {\n\t\t\toptions.attrs.nonce = nonce;\n\t\t}\n\t}\n\n\taddAttrs(style, options.attrs);\n\tinsertStyleElement(options, style);\n\n\treturn style;\n}\n\nfunction createLinkElement (options) {\n\tvar link = document.createElement(\"link\");\n\n\tif(options.attrs.type === undefined) {\n\t\toptions.attrs.type = \"text/css\";\n\t}\n\toptions.attrs.rel = \"stylesheet\";\n\n\taddAttrs(link, options.attrs);\n\tinsertStyleElement(options, link);\n\n\treturn link;\n}\n\nfunction addAttrs (el, attrs) {\n\tObject.keys(attrs).forEach(function (key) {\n\t\tel.setAttribute(key, attrs[key]);\n\t});\n}\n\nfunction getNonce() {\n\tif (false) {}\n\n\treturn __webpack_require__.nc;\n}\n\nfunction addStyle (obj, options) {\n\tvar style, update, remove, result;\n\n\t// If a transform function was defined, run it on the css\n\tif (options.transform && obj.css) {\n\t    result = typeof options.transform === 'function'\n\t\t ? options.transform(obj.css) \n\t\t : options.transform.default(obj.css);\n\n\t    if (result) {\n\t    \t// If transform returns a value, use that instead of the original css.\n\t    \t// This allows running runtime transformations on the css.\n\t    \tobj.css = result;\n\t    } else {\n\t    \t// If the transform function returns a falsy value, don't add this css.\n\t    \t// This allows conditional loading of css\n\t    \treturn function() {\n\t    \t\t// noop\n\t    \t};\n\t    }\n\t}\n\n\tif (options.singleton) {\n\t\tvar styleIndex = singletonCounter++;\n\n\t\tstyle = singleton || (singleton = createStyleElement(options));\n\n\t\tupdate = applyToSingletonTag.bind(null, style, styleIndex, false);\n\t\tremove = applyToSingletonTag.bind(null, style, styleIndex, true);\n\n\t} else if (\n\t\tobj.sourceMap &&\n\t\ttypeof URL === \"function\" &&\n\t\ttypeof URL.createObjectURL === \"function\" &&\n\t\ttypeof URL.revokeObjectURL === \"function\" &&\n\t\ttypeof Blob === \"function\" &&\n\t\ttypeof btoa === \"function\"\n\t) {\n\t\tstyle = createLinkElement(options);\n\t\tupdate = updateLink.bind(null, style, options);\n\t\tremove = function () {\n\t\t\tremoveStyleElement(style);\n\n\t\t\tif(style.href) URL.revokeObjectURL(style.href);\n\t\t};\n\t} else {\n\t\tstyle = createStyleElement(options);\n\t\tupdate = applyToTag.bind(null, style);\n\t\tremove = function () {\n\t\t\tremoveStyleElement(style);\n\t\t};\n\t}\n\n\tupdate(obj);\n\n\treturn function updateStyle (newObj) {\n\t\tif (newObj) {\n\t\t\tif (\n\t\t\t\tnewObj.css === obj.css &&\n\t\t\t\tnewObj.media === obj.media &&\n\t\t\t\tnewObj.sourceMap === obj.sourceMap\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tupdate(obj = newObj);\n\t\t} else {\n\t\t\tremove();\n\t\t}\n\t};\n}\n\nvar replaceText = (function () {\n\tvar textStore = [];\n\n\treturn function (index, replacement) {\n\t\ttextStore[index] = replacement;\n\n\t\treturn textStore.filter(Boolean).join('\\n');\n\t};\n})();\n\nfunction applyToSingletonTag (style, index, remove, obj) {\n\tvar css = remove ? \"\" : obj.css;\n\n\tif (style.styleSheet) {\n\t\tstyle.styleSheet.cssText = replaceText(index, css);\n\t} else {\n\t\tvar cssNode = document.createTextNode(css);\n\t\tvar childNodes = style.childNodes;\n\n\t\tif (childNodes[index]) style.removeChild(childNodes[index]);\n\n\t\tif (childNodes.length) {\n\t\t\tstyle.insertBefore(cssNode, childNodes[index]);\n\t\t} else {\n\t\t\tstyle.appendChild(cssNode);\n\t\t}\n\t}\n}\n\nfunction applyToTag (style, obj) {\n\tvar css = obj.css;\n\tvar media = obj.media;\n\n\tif(media) {\n\t\tstyle.setAttribute(\"media\", media)\n\t}\n\n\tif(style.styleSheet) {\n\t\tstyle.styleSheet.cssText = css;\n\t} else {\n\t\twhile(style.firstChild) {\n\t\t\tstyle.removeChild(style.firstChild);\n\t\t}\n\n\t\tstyle.appendChild(document.createTextNode(css));\n\t}\n}\n\nfunction updateLink (link, options, obj) {\n\tvar css = obj.css;\n\tvar sourceMap = obj.sourceMap;\n\n\t/*\n\t\tIf convertToAbsoluteUrls isn't defined, but sourcemaps are enabled\n\t\tand there is no publicPath defined then lets turn convertToAbsoluteUrls\n\t\ton by default.  Otherwise default to the convertToAbsoluteUrls option\n\t\tdirectly\n\t*/\n\tvar autoFixUrls = options.convertToAbsoluteUrls === undefined && sourceMap;\n\n\tif (options.convertToAbsoluteUrls || autoFixUrls) {\n\t\tcss = fixUrls(css);\n\t}\n\n\tif (sourceMap) {\n\t\t// http://stackoverflow.com/a/26603875\n\t\tcss += \"\\n/*# sourceMappingURL=data:application/json;base64,\" + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + \" */\";\n\t}\n\n\tvar blob = new Blob([css], { type: \"text/css\" });\n\n\tvar oldSrc = link.href;\n\n\tlink.href = URL.createObjectURL(blob);\n\n\tif(oldSrc) URL.revokeObjectURL(oldSrc);\n}\n\n\n//# sourceURL=webpack:///./node_modules/[email protected]@style-loader/lib/addStyles.js?");

/***/ }),

/***/ "./node_modules/[email protected]@style-loader/lib/urls.js":
/*!********************************************************************!*  !*** ./node_modules/[email protected]@style-loader/lib/urls.js ***!
  \********************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

eval("/**\n * When source maps are enabled, `style-loader` uses a link element with a data-uri to\n * embed the css on the page. This breaks all relative urls because now they are relative to a\n * bundle instead of the current page.\n *\n * One solution is to only use full urls, but that may be impossible.\n *\n * Instead, this function \"fixes\" the relative urls to be absolute according to the current page location.\n *\n * A rudimentary test suite is located at `test/fixUrls.js` and can be run via the `npm test` command.\n *\n */\nmodule.exports = function (css) {\n  // get current location\n  var location = typeof window !== \"undefined\" && window.location;\n\n  if (!location) {\n    throw new Error(\"fixUrls requires window.location\");\n  } // blank or null?\n\n\n  if (!css || typeof css !== \"string\") {\n    return css;\n  }\n\n  var baseUrl = location.protocol + \"//\" + location.host;\n  var currentDir = baseUrl + location.pathname.replace(/\\/[^\\/]*$/, \"/\"); // convert each url(...)\n\n  /*\n  This regular expression is just a way to recursively match brackets within\n  a string.\n  \t /url\\s*\\(  = Match on the word \"url\" with any whitespace after it and then a parens\n     (  = Start a capturing group\n       (?:  = Start a non-capturing group\n           [^)(]  = Match anything that isn't a parentheses\n           |  = OR\n           \\(  = Match a start parentheses\n               (?:  = Start another non-capturing groups\n                   [^)(]+  = Match anything that isn't a parentheses\n                   |  = OR\n                   \\(  = Match a start parentheses\n                       [^)(]*  = Match anything that isn't a parentheses\n                   \\)  = Match a end parentheses\n               )  = End Group\n               *\\) = Match anything and then a close parens\n           )  = Close non-capturing group\n           *  = Match anything\n        )  = Close capturing group\n   \\)  = Match a close parens\n  \t /gi  = Get all matches, not the first.  Be case insensitive.\n   */\n\n  var fixedCss = css.replace(/url\\s*\\(((?:[^)(]|\\((?:[^)(]+|\\([^)(]*\\))*\\))*)\\)/gi, function (fullMatch, origUrl) {\n    // strip quotes (if they exist)\n    var unquotedOrigUrl = origUrl.trim().replace(/^\"(.*)\"$/, function (o, $1) {\n      return $1;\n    }).replace(/^'(.*)'$/, function (o, $1) {\n      return $1;\n    }); // already a full url? no change\n\n    if (/^(#|data:|http:\\/\\/|https:\\/\\/|file:\\/\\/\\/|\\s*$)/i.test(unquotedOrigUrl)) {\n      return fullMatch;\n    } // convert the url to a full url\n\n\n    var newUrl;\n\n    if (unquotedOrigUrl.indexOf(\"//\") === 0) {\n      //TODO: should we add protocol?\n      newUrl = unquotedOrigUrl;\n    } else if (unquotedOrigUrl.indexOf(\"/\") === 0) {\n      // path should be relative to the base url\n      newUrl = baseUrl + unquotedOrigUrl; // already starts with '/'\n    } else {\n      // path should be relative to current directory\n      newUrl = currentDir + unquotedOrigUrl.replace(/^\\.\\//, \"\"); // Strip leading './'\n    } // send back the fixed url(...)\n\n\n    return \"url(\" + JSON.stringify(newUrl) + \")\";\n  }); // send back the fixed css\n\n  return fixedCss;\n};\n\n//# sourceURL=webpack:///./node_modules/[email protected]@style-loader/lib/urls.js?");

/***/ }),

/***/ "./src/index.js":
/*!**********************!*  !*** ./src/index.js ***!
  \**********************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
// 第一步
console.log(1);
eval("__webpack_require__(/*! ./main.css */ \"./src/main.css\");\n\nmodule.exports = {\n  name: 'index'\n};\n\n//# sourceURL=webpack:///./src/index.js?");
// console.log(module.exports);
/***/ }),

/***/ "./src/main.css":
/*!**********************!*  !*** ./src/main.css ***!
  \**********************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
// 第二步
console.log(2);
eval("\nvar content = __webpack_require__(/*! !../node_modules/[email protected]@css-loader/dist/cjs.js!./main.css */ \"./node_modules/[email protected]@css-loader/dist/cjs.js!./src/main.css\");\n\nif(typeof content === 'string') content = [[module.i, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = __webpack_require__(/*! ../node_modules/[email protected]@style-loader/lib/addStyles.js */ \"./node_modules/[email protected]@style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(false) {}\n\n//# sourceURL=webpack:///./src/main.css?");
console.log(content);
/***/ })

/******/ });
 

webapck: 分析使用css-loader和style-loader打包後的代碼