fix(mod_compiler): add diagnostic snapshots for output directories around clear and compile steps

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '4.1.19',
+  version: '4.1.20',
   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

@@ -338,13 +338,30 @@ export class TsCompiler {
       // Get destination directory as absolute path
       const destDir = smartpath.transform.toAbsolute(destPath, this.cwd) as string;
 
+      // Diagnostic helper
+      const diagSnap = (label: string) => {
+        if (!isQuiet && !isJson) {
+          for (const prevDir of successfulOutputDirs) {
+            try {
+              const entries = fs.readdirSync(prevDir);
+              const dirs = entries.filter(e => { try { return fs.statSync(prevDir + '/' + e).isDirectory(); } catch { return false; } });
+              console.log(`   📋 [${label}] ${prevDir.replace(this.cwd + '/', '')}: ${entries.length} entries, ${dirs.length} dirs`);
+            } catch {
+              console.log(`   📋 [${label}] ${prevDir.replace(this.cwd + '/', '')}: MISSING!`);
+            }
+          }
+        }
+      };
+
       // Clear the destination directory before compilation if it exists
+      diagSnap('pre-clear');
       if (await FsHelpers.directoryExists(destDir)) {
         if (!isQuiet && !isJson) {
           console.log(`🧹 Clearing output directory: ${destPath}`);
         }
         await FsHelpers.removeDirectory(destDir);
       }
+      diagSnap('post-clear');
 
       // Update compiler options with the output directory
       const options: CompilerOptions = {
@@ -365,6 +382,7 @@ export class TsCompiler {
       const result = await this.compileFiles(absoluteFiles, options, taskInfo);
       emittedFiles.push(...result.emittedFiles);
       errorSummaries.push(result.errorSummary);
+      diagSnap('post-compile');
 
       // Perform unpack if compilation succeeded
       if (result.errorSummary.totalErrors === 0) {