Use comparePaths via helper

Author: jakebailey

src/compiler/moduleSpecifiers.ts

@@ -548,11 +548,10 @@ function getLocalModuleSpecifier(moduleFileName: string, info: Info, compilerOpt
             return maybeNonRelative;
         }
 
-        let nearestTargetPackageJson = getNearestAncestorDirectoryWithPackageJson(host, getDirectoryPath(modulePath));
-        let nearestSourcePackageJson = getNearestAncestorDirectoryWithPackageJson(host, sourceDirectory);
-        nearestTargetPackageJson &&= toPath(nearestTargetPackageJson, projectDirectory, getCanonicalFileName);
-        nearestSourcePackageJson &&= toPath(nearestSourcePackageJson, projectDirectory, getCanonicalFileName);
-        if (nearestSourcePackageJson !== nearestTargetPackageJson) {
+        const nearestTargetPackageJson = getNearestAncestorDirectoryWithPackageJson(host, getDirectoryPath(modulePath));
+        const nearestSourcePackageJson = getNearestAncestorDirectoryWithPackageJson(host, sourceDirectory);
+        const ignoreCase = !hostUsesCaseSensitiveFileNames(host);
+        if (!packageJsonPathsAreEqual(nearestTargetPackageJson, nearestSourcePackageJson, ignoreCase)) {
             // 2. The importing and imported files are part of different packages.
             //
             //      packages/a/
@@ -572,6 +571,12 @@ function getLocalModuleSpecifier(moduleFileName: string, info: Info, compilerOpt
     return isPathRelativeToParent(maybeNonRelative) || countPathComponents(relativePath) < countPathComponents(maybeNonRelative) ? relativePath : maybeNonRelative;
 }
 
+function packageJsonPathsAreEqual(a: string | undefined, b: string | undefined, ignoreCase?: boolean) {
+    if (a === b) return true;
+    if (a === undefined || b === undefined) return false;
+    return comparePaths(a, b, ignoreCase) === Comparison.EqualTo;
+}
+
 /** @internal */
 export function countPathComponents(path: string): number {
     let count = 0;