fix(compiler-cli): propagate ts.SourceFile moduleName into metadata

packages/compiler-cli/src/metadata/collector.ts

@@ -550,6 +550,7 @@ export class MetadataCollector {
         __symbolic: 'module',
         version: this.options.version || METADATA_VERSION, metadata
       };
+      if (sourceFile.moduleName) result.importAs = sourceFile.moduleName;
       if (exports) result.exports = exports;
       return result;
     }

packages/compiler-cli/src/transformers/metadata_reader.ts

@@ -112,6 +112,7 @@ function upgradeMetadataWithDtsData(
         newMetadata.metadata[prop] = dtsMetadata.metadata[prop];
       }
     }
+    if (dtsMetadata['importAs']) newMetadata['importAs'] = dtsMetadata['importAs'];
 
     // Only copy exports from exports from metadata prior to version 3.
     // Starting with version 3 the collector began collecting exports and