Method generateExportCode

lib/css/CssGenerator.js:359–533

()

					}
				};
				const generateExportCode = () => {
					/**
					 * Generates js default export.
					 * @returns {Source | null} the default export
					 */
					const generateJSDefaultExport = () => {
						switch (exportType) {
							case "text": {
								return this._generateCssText(module, generateContext, true);
							}
							case "css-style-sheet": {
								const rt = generateContext.runtimeTemplate;
								const fnPrefix = rt.supportsArrowFunction()
									? "() => {\n"
									: "function() {\n";
								const constOrVar = rt.renderConst();
								const fallback =
									"{ cssText: css, replaceSync: function(value) { this.cssText = value; } }";
								if (rt.compilation.compiler.platform.node === true) {
									return new ConcatSource(
										`(${fnPrefix}${constOrVar} css = `,
										this._generateCssText(module, generateContext, true),
										`;\nreturn ${fallback};\n})()`
									);
								}
								if (rt.isUniversalTarget()) {
									return new ConcatSource(
										`(${fnPrefix}${constOrVar} css = `,
										this._generateCssText(module, generateContext, true),
										`;\nif (typeof CSSStyleSheet === 'undefined') return ${fallback};\n${constOrVar} sheet = new CSSStyleSheet();\nsheet.replaceSync(css);\nreturn sheet;\n})()`
									);
								}
								return new ConcatSource(
									`(${fnPrefix}${constOrVar} sheet = new CSSStyleSheet();\nsheet.replaceSync(`,
									this._generateCssText(module, generateContext, true),
									");\nreturn sheet;\n})()"
								);
							}
							default:
								return null;
						}
					};

					/** @type {Source | null} */
					const defaultExport = generateJSDefaultExport();

					/** @type {CssModuleBuildInfo} */
					(module.buildInfo).cssData = cssData;

					// Required for HMR
					if (module.hot) {
						generateContext.runtimeRequirements.add(RuntimeGlobals.module);
					}

					if (!defaultExport && cssData.exports.size === 0 && !isCssModule) {
						return new RawSource("");
					}