From bc2983def97ccaa10c98b17d3942b9d5806dcfda Mon Sep 17 00:00:00 2001
From: Klaus Meinhardt <klaus.meinhardt1@gmail.com>
Date: Sat, 6 Jan 2018 02:36:33 +0100
Subject: [PATCH] API: fix types to undefined union (#20909)

---
 src/compiler/types.ts                              | 6 +++---
 tests/baselines/reference/api/tsserverlibrary.d.ts | 6 +++---
 tests/baselines/reference/api/typescript.d.ts      | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 8398726ee66..4f5ef1900f5 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2540,7 +2540,7 @@ namespace ts {
     export interface ParseConfigHost {
         useCaseSensitiveFileNames: boolean;
 
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string>, includes: ReadonlyArray<string>, depth: number): string[];
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
 
         /**
          * Gets a value indicating whether the specified path exists and is a file.
@@ -4380,11 +4380,11 @@ namespace ts {
          * If resolveModuleNames is implemented then implementation for members from ModuleResolutionHost can be just
          * 'throw new Error("NotImplemented")'
          */
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): (ResolvedTypeReferenceDirective | undefined)[];
         getEnvironmentVariable?(name: string): string;
         /* @internal */ onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions): void;
         /* @internal */ hasInvalidatedResolution?: HasInvalidatedResolution;
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index aeefab5761e..aa9e1d9a62f 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -1615,7 +1615,7 @@ declare namespace ts {
     }
     interface ParseConfigHost {
         useCaseSensitiveFileNames: boolean;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string>, includes: ReadonlyArray<string>, depth: number): string[];
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
         /**
          * Gets a value indicating whether the specified path exists and is a file.
          * @param path The path to test.
@@ -2468,11 +2468,11 @@ declare namespace ts {
         getCanonicalFileName(fileName: string): string;
         useCaseSensitiveFileNames(): boolean;
         getNewLine(): string;
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): (ResolvedTypeReferenceDirective | undefined)[];
         getEnvironmentVariable?(name: string): string;
     }
     interface SourceMapRange extends TextRange {
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 5d4b0d8b7b8..3ee55ce823d 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -1615,7 +1615,7 @@ declare namespace ts {
     }
     interface ParseConfigHost {
         useCaseSensitiveFileNames: boolean;
-        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string>, includes: ReadonlyArray<string>, depth: number): string[];
+        readDirectory(rootDir: string, extensions: ReadonlyArray<string>, excludes: ReadonlyArray<string> | undefined, includes: ReadonlyArray<string>, depth?: number): string[];
         /**
          * Gets a value indicating whether the specified path exists and is a file.
          * @param path The path to test.
@@ -2468,11 +2468,11 @@ declare namespace ts {
         getCanonicalFileName(fileName: string): string;
         useCaseSensitiveFileNames(): boolean;
         getNewLine(): string;
-        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): ResolvedModule[];
+        resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames?: string[]): (ResolvedModule | undefined)[];
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
-        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): ResolvedTypeReferenceDirective[];
+        resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[], containingFile: string): (ResolvedTypeReferenceDirective | undefined)[];
         getEnvironmentVariable?(name: string): string;
     }
     interface SourceMapRange extends TextRange {