sourceFileToPackageName to keyed with Path

Author: sheetalkamat

src/compiler/program.ts

@@ -913,7 +913,7 @@ namespace ts {
         // `packageIdToSourceFile` is only used while building the program, while `sourceFileToPackageName` and `isSourceFileTargetOfRedirect` are kept around.
         let packageIdToSourceFile = new Map<string, SourceFile>();
         // Maps from a SourceFile's `.path` to the name of the package it was imported with.
-        let sourceFileToPackageName = new Map<string, string>();
+        let sourceFileToPackageName = new Map<Path, string>();
         // Key is a file name. Value is the (non-empty, or undefined) list of files that redirect to it.
         let redirectTargetsMap = createMultiMap<Path, string>();
 

src/compiler/types.ts

@@ -3861,7 +3861,7 @@ namespace ts {
         /* @internal */ getLibFileFromReference(ref: FileReference): SourceFile | undefined;
 
         /** Given a source file, get the name of the package it was imported from. */
-        /* @internal */ sourceFileToPackageName: ESMap<string, string>;
+        /* @internal */ sourceFileToPackageName: ESMap<Path, string>;
         /** Set of all source files that some other source file redirects to. */
         /* @internal */ redirectTargetsMap: MultiMap<Path, string>;
         /** Is the file emitted file */
@@ -3956,7 +3956,7 @@ namespace ts {
         getFileProcessingDiagnostics(): readonly ReusableFilePreprocessingDiagnostics[] | undefined;
 
         redirectTargetsMap: MultiMap<Path, string>;
-        sourceFileToPackageName: ESMap<string, string>;
+        sourceFileToPackageName: ESMap<Path, string>;
         structureIsReused?: StructureIsReused;
     }