fix: only clear BROWSERSLIST when it looks like shell script garbage (fixes #1781)

Improved the Browserslist fix to be smarter:
- Only clears BROWSERSLIST when value contains shell script patterns
  (
- Preserves legitimate browser query values like 'last 2 Chrome versions'
- This avoids breaking users who intentionally set BROWSERSLIST
  for PostCSS/Autoprefixer targeting

Author: armorbreak001

src/apps/cli/internal/base/BaseGeneratorCommand.ts

@@ -95,13 +95,19 @@ export abstract class BaseGeneratorCommand extends Command {
   ): Promise<void> {
     const specification = await this.loadSpecificationSafely(asyncapi);
 
-    // When installed via pnpm, the BROWSERSLIST env variable may contain
+    // When installed via pnpm globally, the BROWSERSLIST env variable may contain
     // shell script content (e.g., "basedir=$(dirname ...)") that gets
     // misinterpreted by PostCSS/Autoprefixer inside HTML templates.
-    // Clear it before generator execution and restore afterwards.
+    // Only clear when the value looks like shell script garbage, not legitimate
+    // browser queries like "last 2 Chrome versions" or "> 1%".
     // See: https://github.com/asyncapi/cli/issues/1781
     const originalBrowserslist = process.env.BROWSERSLIST;
-    if (originalBrowserslist !== undefined) {
+    const looksLikeShellScript = originalBrowserslist !== undefined && (
+      originalBrowserslist.includes('$(') ||
+      originalBrowserslist.includes('`') ||
+      /^\w+=/.test(originalBrowserslist)
+    );
+    if (looksLikeShellScript) {
       delete process.env.BROWSERSLIST;
     }
 
@@ -119,11 +125,9 @@ export abstract class BaseGeneratorCommand extends Command {
         throw new GeneratorError(new Error(result.error));
       }
     } finally {
-      // Restore original BROWSERSLIST value
-      if (originalBrowserslist !== undefined) {
+      // Restore original BROWSERSLIST value only if we cleared it
+      if (looksLikeShellScript) {
         process.env.BROWSERSLIST = originalBrowserslist;
-      } else {
-        delete process.env.BROWSERSLIST;
       }
     }
   }