From f1904a93f5ccfbd69b436d68795e94c3525ee33d Mon Sep 17 00:00:00 2001
From: kingwl <805037171@163.com>
Date: Mon, 16 Oct 2017 15:50:04 +0800
Subject: [PATCH]  fix completions for string literal types with template
 string (#19162)

---
 src/services/completions.ts                               | 4 ++--
 ...rStringLiteralTypeWithNoSubstitutionTemplateLiteral.ts | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)
 create mode 100644 tests/cases/fourslash/completionListAfterStringLiteralTypeWithNoSubstitutionTemplateLiteral.ts

diff --git a/src/services/completions.ts b/src/services/completions.ts
index 3c233f4dbe8..f1f37e46356 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -213,7 +213,7 @@ namespace ts.Completions {
 
     function getStringLiteralCompletionEntries(sourceFile: SourceFile, position: number, typeChecker: TypeChecker, compilerOptions: CompilerOptions, host: LanguageServiceHost, log: Log): CompletionInfo | undefined {
         const node = findPrecedingToken(position, sourceFile);
-        if (!node || node.kind !== SyntaxKind.StringLiteral) {
+        if (!node || (node.kind !== SyntaxKind.StringLiteral && node.kind !== SyntaxKind.NoSubstitutionTemplateLiteral)) {
             return undefined;
         }
 
@@ -278,7 +278,7 @@ namespace ts.Completions {
 
             // Get completion for string literal from string literal type
             // i.e. var x: "hi" | "hello" = "/*completion position*/"
-            return getStringLiteralCompletionEntriesFromType(typeChecker.getContextualType(<StringLiteral>node), typeChecker);
+            return getStringLiteralCompletionEntriesFromType(typeChecker.getContextualType(<LiteralExpression>node), typeChecker);
         }
     }
 
diff --git a/tests/cases/fourslash/completionListAfterStringLiteralTypeWithNoSubstitutionTemplateLiteral.ts b/tests/cases/fourslash/completionListAfterStringLiteralTypeWithNoSubstitutionTemplateLiteral.ts
new file mode 100644
index 00000000000..c5deac5123e
--- /dev/null
+++ b/tests/cases/fourslash/completionListAfterStringLiteralTypeWithNoSubstitutionTemplateLiteral.ts
@@ -0,0 +1,8 @@
+/// <reference path="fourslash.ts" />
+
+////let count: 'one' | 'two';
+////count = `/**/`
+
+goTo.marker();
+verify.completionListContains('one');
+verify.completionListContains('two');