Merge pull request #150 from react-component/fix-jest-28

fix: jest 28 compatable

src/transformers/fileTransformer.ts

@@ -1,11 +1,15 @@
 import path from "path";
 
+// Jest 28 has breaking change of this.
+const jestPkg = require('jest/package.json');
+const aboveJest28 = parseFloat(jestPkg.version) >= 28;
+
 export default {
   process(src: string, filename: string) {
     const assetFilename = JSON.stringify(path.basename(filename));
 
     if (filename.match(/\.svg$/)) {
-      return `module.exports = {
+      const code = `module.exports = {
         __esModule: true,
         default: ${assetFilename},
         ReactComponent: ({ svgRef, ...props }) => ({
@@ -18,8 +22,11 @@ export default {
           })
         }),
       };`;
+
+      return aboveJest28 ? { code } : code;
     }
 
-    return `module.exports = ${assetFilename};`;
+    const rawCode = `module.exports = ${assetFilename};`;
+    return aboveJest28 ? { code: rawCode } : rawCode;
   },
 };