fix(compiler): log emitted files written outside expected destination directory for diagnostics

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '4.1.20',
+  version: '4.1.21',
   description: 'A tool for compiling TypeScript files using the latest nightly features, offering flexible APIs and a CLI for streamlined development.'
 }

ts/mod_compiler/classes.tscompiler.ts

@@ -384,6 +384,20 @@ export class TsCompiler {
       errorSummaries.push(result.errorSummary);
       diagSnap('post-compile');
 
+      // Diagnostic: log emitted files that went to unexpected directories
+      if (!isQuiet && !isJson && result.emittedFiles.length > 0) {
+        const unexpectedFiles = result.emittedFiles.filter(f => !f.startsWith(destDir + '/') && !f.startsWith(destDir + '\\'));
+        if (unexpectedFiles.length > 0) {
+          console.log(`   ⚠️ [diag] ${unexpectedFiles.length} files emitted OUTSIDE ${destPath}:`);
+          for (const f of unexpectedFiles.slice(0, 20)) {
+            console.log(`      ${f.replace(this.cwd + '/', '')}`);
+          }
+          if (unexpectedFiles.length > 20) {
+            console.log(`      ... and ${unexpectedFiles.length - 20} more`);
+          }
+        }
+      }
+
       // Perform unpack if compilation succeeded
       if (result.errorSummary.totalErrors === 0) {
         await performUnpack(pattern, destDir, this.cwd);