diff --git a/src/postcss-loader.js b/src/postcss-loader.js
index bbac026..ec98a65 100644
--- a/src/postcss-loader.js
+++ b/src/postcss-loader.js
@@ -191,29 +191,27 @@ export default {
 
     const cssVariableName = identifier('css', true)
     if (shouldExtract) {
-      output += `export default ${JSON.stringify(modulesExported[this.id])};`
+      output += `export default ${JSON.stringify(modulesExported[this.id])};`;
       extracted = {
         id: this.id,
         code: result.css,
         map: outputMap
-      }
+      };
     } else {
-      const module = supportModules ?
-        JSON.stringify(modulesExported[this.id]) :
-        cssVariableName
+      const module = supportModules ? JSON.stringify(modulesExported[this.id]) : cssVariableName;
       output +=
         `var ${cssVariableName} = ${JSON.stringify(result.css)};\n` +
-        `export default ${module};\n` +
-        `export var stylesheet=${JSON.stringify(result.css)};`
+        `var styleMapping = ${module};\n` +
+        `export var stylesheet=${JSON.stringify(result.css)};`;
     }
 
     if (!shouldExtract && shouldInject) {
       output += typeof options.inject === 'function' ? options.inject(cssVariableName, this.id) : '\n' +
         `import styleInject from '${styleInjectPath}';\n` +
-        `styleInject(${cssVariableName}${Object.keys(options.inject).length > 0 ?
+        `export default /*#__PURE__*/(function() {\n  styleInject(${cssVariableName}${Object.keys(options.inject).length > 0 ?
           `,${JSON.stringify(options.inject)}` :
           ''
-        });`
+        });\n  return styleMapping;\n})();`;
     }
 
     return {