vue hello world项目
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = loader;
var _path = _interopRequireDefault(require("path"));
var _semver = require("semver");
var _package = _interopRequireDefault(require("postcss/package.json"));
var _Warning = _interopRequireDefault(require("./Warning"));
var _Error = _interopRequireDefault(require("./Error"));
var _options = _interopRequireDefault(require("./options.json"));
var _utils = require("./utils");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
let hasExplicitDependencyOnPostCSS = false;
/**
* **PostCSS Loader**
*
* Loads && processes CSS with [PostCSS](https://github.com/postcss/postcss)
*
* @method loader
*
* @param {String} content Source
* @param {Object} sourceMap Source Map
* @param {Object} meta Meta
*
* @return {callback} callback Result
*/
async function loader(content, sourceMap, meta) {
const options = this.getOptions(_options.default);
const callback = this.async();
const configOption = typeof options.postcssOptions === "undefined" || typeof options.postcssOptions.config === "undefined" ? true : options.postcssOptions.config;
const postcssFactory = (0, _utils.getPostcssImplementation)(this, options.implementation);
if (!postcssFactory) {
callback(new Error(`The Postcss implementation "${options.implementation}" not found`));
return;
}
let loadedConfig;
if (configOption) {
try {
loadedConfig = await (0, _utils.loadConfig)(this, configOption, options.postcssOptions);
} catch (error) {
callback(error);
return;
}
}
const useSourceMap = typeof options.sourceMap !== "undefined" ? options.sourceMap : this.sourceMap;
const {
plugins,
processOptions
} = await (0, _utils.getPostcssOptions)(this, loadedConfig, options.postcssOptions);
if (useSourceMap) {
processOptions.map = {
inline: false,
annotation: false,
...processOptions.map
};
}
if (sourceMap && processOptions.map) {
processOptions.map.prev = (0, _utils.normalizeSourceMap)(sourceMap, this.context);
}
let root; // Reuse PostCSS AST from other loaders
if (meta && meta.ast && meta.ast.type === "postcss" && (0, _semver.satisfies)(meta.ast.version, `^${_package.default.version}`)) {
({
root
} = meta.ast);
}
if (!root && options.execute) {
// eslint-disable-next-line no-param-reassign
content = (0, _utils.exec)(content, this);
}
let result;
let processor;
try {
processor = postcssFactory(plugins);
result = await processor.process(root || content, processOptions);
} catch (error) {
// Check postcss versions to avoid using PostCSS 7.
// For caching reasons, we use the readFileSync and existsSync functions from the context,
// not the functions from the `fs` module.
if (!hasExplicitDependencyOnPostCSS && processor && processor.version && processor.version.startsWith("7.")) {
// The `findPackageJsonDir` function returns `string` or `null`.
// This is used to do for caching, that is, an explicit comparison with `undefined`
// is used to make the condition body run once.
const packageJSONDir = (0, _utils.findPackageJSONDir)(process.cwd(), this.fs.statSync);
if (packageJSONDir) {
let bufferOfPackageJSON;
try {
bufferOfPackageJSON = this.fs.readFileSync(_path.default.resolve(packageJSONDir, "package.json"), "utf8");
} catch (_error) {// Nothing
}
if (bufferOfPackageJSON) {
let pkg;
try {
pkg = JSON.parse(bufferOfPackageJSON);
} catch (_error) {// Nothing
}
if (pkg) {
if (!pkg.dependencies.postcss && !pkg.devDependencies.postcss) {
this.emitWarning(new Error("Add postcss as project dependency. postcss is not a peer dependency for postcss-loader. " + "Use `npm install postcss` or `yarn add postcss`"));
} else {
hasExplicitDependencyOnPostCSS = true;
}
}
}
}
}
if (error.file) {
this.addDependency(error.file);
}
if (error.name === "CssSyntaxError") {
callback(new _Error.default(error));
} else {
callback(error);
}
return;
}
for (const warning of result.warnings()) {
this.emitWarning(new _Warning.default(warning));
}
for (const message of result.messages) {
// eslint-disable-next-line default-case
switch (message.type) {
case "dependency":
this.addDependency(message.file);
break;
case "build-dependency":
this.addBuildDependency(message.file);
break;
case "missing-dependency":
this.addMissingDependency(message.file);
break;
case "context-dependency":
this.addContextDependency(message.file);
break;
case "dir-dependency":
this.addContextDependency(message.dir);
break;
case "asset":
if (message.content && message.file) {
this.emitFile(message.file, message.content, message.sourceMap, message.info);
}
}
} // eslint-disable-next-line no-undefined
let map = result.map ? result.map.toJSON() : undefined;
if (map && useSourceMap) {
map = (0, _utils.normalizeSourceMapAfterPostcss)(map, this.context);
}
const ast = {
type: "postcss",
version: result.processor.version,
root: result.root
};
callback(null, result.css, map, {
ast
});
}