chore: make post-merge change to customRenderer (#257)

README.md

@@ -152,11 +152,27 @@ The custom renderer itself should be a JavaScript file. The function will be cal
 module.exports = (css, { fileName, logger }) => {
   try {
     // ...process your css here.
+
+    // `string`
     return renderedCss;
-    // css and sourceMap
+  } catch (error) {
+    logger.error(error.message);
+  }
+};
+```
+
+If you want to return a a source map, you can return an object from your exported function.
+
+```js
+module.exports = (css, { fileName, logger }) => {
+  try {
+    // ...process your css here.
+
     return {
+      // `string`
       css: renderedCss,
-      map: sourceMap,
+      // `RawSourceMap`
+      sourceMap: sourceMap,
     };
   } catch (error) {
     logger.error(error.message);

src/helpers/getCssExports.ts

@@ -64,16 +64,16 @@ export const getCssExports = ({
     if (options.customRenderer) {
       // eslint-disable-next-line @typescript-eslint/no-var-requires
       const customRenderer = require(options.customRenderer) as CustomRenderer;
-      const customResult = customRenderer(rawCss, {
+      const result = customRenderer(rawCss, {
         fileName,
         logger,
         compilerOptions,
       });
-      if (typeof customResult === 'string') {
-        transformedCss = customResult;
-      } else if (customResult.css) {
-        transformedCss = customResult.css;
-        sourceMap = customResult.map;
+      if (typeof result === 'string') {
+        transformedCss = result;
+      } else if (result.css) {
+        transformedCss = result.css;
+        sourceMap = result.sourceMap;
       }
     } else {
       switch (fileType) {

src/options.ts

@@ -57,7 +57,7 @@ export type CustomRenderer = (
   | string
   | {
       css: string;
-      map?: RawSourceMap;
+      sourceMap?: RawSourceMap;
     };
 
 export interface CustomTemplateOptions {