diff --git a/src/compiler/inspectValue.ts b/src/compiler/inspectValue.ts
index 8433ee6e489..381f47d12e9 100644
--- a/src/compiler/inspectValue.ts
+++ b/src/compiler/inspectValue.ts
@@ -148,7 +148,7 @@ namespace ts {
     }
 
     export function isJsPrivate(name: string): boolean {
-        return name.startsWith("_");
+        return startsWith(name, "_");
     }
 
     function tryRequire(fileNameToRequire: string): unknown {
diff --git a/src/compiler/moduleSpecifiers.ts b/src/compiler/moduleSpecifiers.ts
index 1913ee90b2b..f5bac45f6ab 100644
--- a/src/compiler/moduleSpecifiers.ts
+++ b/src/compiler/moduleSpecifiers.ts
@@ -203,7 +203,7 @@ namespace ts.moduleSpecifiers {
                 return; // Don't want to a package to globally import from itself
             }
 
-            const target = targets.find(t => compareStrings(t.slice(0, resolved.length + 1), resolved + "/") === Comparison.EqualTo);
+            const target = find(targets, t => compareStrings(t.slice(0, resolved.length + 1), resolved + "/") === Comparison.EqualTo);
             if (target === undefined) return;
 
             const relative = getRelativePathFromDirectory(resolved, target, getCanonicalFileName);
diff --git a/src/services/rename.ts b/src/services/rename.ts
index 7ba32c91309..a51d79797bf 100644
--- a/src/services/rename.ts
+++ b/src/services/rename.ts
@@ -45,7 +45,7 @@ namespace ts.Rename {
 
         const moduleSourceFile = find(moduleSymbol.declarations, isSourceFile);
         if (!moduleSourceFile) return undefined;
-        const withoutIndex = node.text.endsWith("/index") || node.text.endsWith("/index.js") ? undefined : tryRemoveSuffix(removeFileExtension(moduleSourceFile.fileName), "/index");
+        const withoutIndex = endsWith(node.text, "/index") || endsWith(node.text, "/index.js") ? undefined : tryRemoveSuffix(removeFileExtension(moduleSourceFile.fileName), "/index");
         const name = withoutIndex === undefined ? moduleSourceFile.fileName : withoutIndex;
         const kind = withoutIndex === undefined ? ScriptElementKind.moduleElement : ScriptElementKind.directory;
         const indexAfterLastSlash = node.text.lastIndexOf("/") + 1;