Resolve typeReferenceDirective as fileOrDirectory instead of just dir…

…ectory

Fixes #37708
Bug 2 part of the issue

src/compiler/moduleNameResolver.ts

@@ -343,15 +343,15 @@ namespace ts {
                     trace(host, Diagnostics.Resolving_with_primary_search_path_0, typeRoots.join(", "));
                 }
                 return firstDefined(typeRoots, typeRoot => {
-                    const candidate = combinePaths(typeRoot, typeReferenceDirectiveName);
-                    const candidateDirectory = getDirectoryPath(candidate);
-                    const directoryExists = directoryProbablyExists(candidateDirectory, host);
-                    if (!directoryExists && traceEnabled) {
-                        trace(host, Diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it, candidateDirectory);
-                    }
                     return resolvedTypeScriptOnly(
-                        loadNodeModuleFromDirectory(Extensions.DtsOnly, candidate,
-                            !directoryExists, moduleResolutionState));
+                        nodeLoadModuleByRelativeName(
+                            Extensions.DtsOnly,
+                            combinePaths(typeRoot, typeReferenceDirectiveName),
+                            /*onlyRecordFailures*/ false,
+                            moduleResolutionState,
+                             /*considerPackageJson*/ true
+                        )
+                    );
                 });
             }
             else {

tests/baselines/reference/typeReferenceDirectiveWithTypeAsFile.symbols

@@ -1,4 +1,8 @@
 === /a.ts ===
 a;
-No type information for this code.
-No type information for this code.
+>a : Symbol(a, Decl(phaser.d.ts, 0, 13))
+
+=== /node_modules/phaser/types/phaser.d.ts ===
+declare const a: number;
+>a : Symbol(a, Decl(phaser.d.ts, 0, 13))
+

tests/baselines/reference/typeReferenceDirectiveWithTypeAsFile.trace.json

@@ -1,10 +1,9 @@
 [
     "======== Resolving type reference directive 'phaser', containing file '/__inferred type names__.ts', root directory '/node_modules/phaser/types'. ========",
     "Resolving with primary search path '/node_modules/phaser/types'.",
-    "Looking up in 'node_modules' folder, initial location '/'.",
+    "Loading module as file / folder, candidate module location '/node_modules/phaser/types/phaser', target file type 'DtsOnly'.",
+    "File '/node_modules/phaser/types/phaser.d.ts' exist - use it as a name resolution result.",
     "File '/node_modules/phaser/package.json' does not exist.",
-    "File '/node_modules/phaser.d.ts' does not exist.",
-    "File '/node_modules/phaser/index.d.ts' does not exist.",
-    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
-    "======== Type reference directive 'phaser' was not resolved. ========"
+    "Resolving real path for '/node_modules/phaser/types/phaser.d.ts', result '/node_modules/phaser/types/phaser.d.ts'.",
+    "======== Type reference directive 'phaser' was successfully resolved to '/node_modules/phaser/types/phaser.d.ts', primary: true. ========"
 ]

tests/baselines/reference/typeReferenceDirectiveWithTypeAsFile.types

@@ -1,4 +1,8 @@
 === /a.ts ===
 a;
->a : any
+>a : number
+
+=== /node_modules/phaser/types/phaser.d.ts ===
+declare const a: number;
+>a : number