Add string literal completions for package.json imports field

src/compiler/utilities.ts

@@ -192,6 +192,7 @@ import {
     getParseTreeNode,
     getPathComponents,
     getPathFromPathComponents,
+    getRelativePathFromDirectory,
     getRelativePathToDirectoryOrUrl,
     getResolutionModeOverride,
     getRootLength,
@@ -471,6 +472,7 @@ import {
     ResolvedModuleWithFailedLookupLocations,
     ResolvedTypeReferenceDirective,
     ResolvedTypeReferenceDirectiveWithFailedLookupLocations,
+    resolvePath,
     ReturnStatement,
     SatisfiesExpression,
     ScriptKind,
@@ -6288,6 +6290,21 @@ export function getPossibleOriginalInputExtensionForExtension(path: string) {
         [Extension.Tsx, Extension.Ts, Extension.Jsx, Extension.Js];
 }
 
+/** @internal */
+export function getPossibleOriginalInputPathWithoutChangingExt(
+    filePath: string,
+    ignoreCase: boolean,
+    outputDir: string | undefined,
+    getCommonSourceDirectory: () => string,
+): string {
+    return outputDir ?
+        resolvePath(
+            getCommonSourceDirectory(),
+            getRelativePathFromDirectory(outputDir, filePath, ignoreCase),
+        ) :
+        filePath;
+}
+
 /**
  * Returns 'undefined' if and only if 'options.paths' is undefined.
  *