From 8094007a1dfa03443e69bfa760739912c7233488 Mon Sep 17 00:00:00 2001
From: Oleksandr T <oleksandr.tarasiuk@outlook.com>
Date: Wed, 18 Jan 2023 00:10:29 +0200
Subject: [PATCH] fix(52277): switch/case completions fail when has a negative
 literal type (#52278)

---
 src/services/completions.ts                   |  4 +--
 .../fourslash/exhaustiveCaseCompletions7.ts   | 29 +++++++++++++++++++
 .../fourslash/exhaustiveCaseCompletions8.ts   | 28 ++++++++++++++++++
 3 files changed, 59 insertions(+), 2 deletions(-)
 create mode 100644 tests/cases/fourslash/exhaustiveCaseCompletions7.ts
 create mode 100644 tests/cases/fourslash/exhaustiveCaseCompletions8.ts

diff --git a/src/services/completions.ts b/src/services/completions.ts
index 59166fe91ecf1..c2f8bb72aff06 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -1050,10 +1050,10 @@ function getExhaustiveCaseSnippets(
             else if (!tracker.hasValue(type.value)) {
                 switch (typeof type.value) {
                     case "object":
-                        elements.push(factory.createBigIntLiteral(type.value));
+                        elements.push(type.value.negative ? factory.createPrefixUnaryExpression(SyntaxKind.MinusToken, factory.createBigIntLiteral({ negative: false, base10Value: type.value.base10Value })) : factory.createBigIntLiteral(type.value));
                         break;
                     case "number":
-                        elements.push(factory.createNumericLiteral(type.value));
+                        elements.push(type.value < 0 ? factory.createPrefixUnaryExpression(SyntaxKind.MinusToken, factory.createNumericLiteral(-type.value)) : factory.createNumericLiteral(type.value));
                         break;
                     case "string":
                         elements.push(factory.createStringLiteral(type.value, quotePreference === QuotePreference.Single));
diff --git a/tests/cases/fourslash/exhaustiveCaseCompletions7.ts b/tests/cases/fourslash/exhaustiveCaseCompletions7.ts
new file mode 100644
index 0000000000000..5038caf94f1f1
--- /dev/null
+++ b/tests/cases/fourslash/exhaustiveCaseCompletions7.ts
@@ -0,0 +1,29 @@
+/// <reference path="fourslash.ts" />
+
+// @newline: LF
+////export function foo(position: -1 | 0 | 1) {
+////    switch (position) {
+////        /**/
+////    }
+////}
+
+verify.completions(
+    {
+        marker: "",
+        isNewIdentifierLocation: false,
+        includes: [
+            {
+                name: "case 0: ...",
+                source: completion.CompletionSource.SwitchCases,
+                sortText: completion.SortText.GlobalsOrKeywords,
+                insertText:
+`case 0:
+case 1:
+case -1:`,
+            },
+        ],
+        preferences: {
+            includeCompletionsWithInsertText: true,
+        },
+    },
+);
diff --git a/tests/cases/fourslash/exhaustiveCaseCompletions8.ts b/tests/cases/fourslash/exhaustiveCaseCompletions8.ts
new file mode 100644
index 0000000000000..28da2b9417b23
--- /dev/null
+++ b/tests/cases/fourslash/exhaustiveCaseCompletions8.ts
@@ -0,0 +1,28 @@
+/// <reference path="fourslash.ts" />
+
+// @newline: LF
+////export function foo(position: -1n | 0n) {
+////    switch (position) {
+////        /**/
+////    }
+////}
+
+verify.completions(
+    {
+        marker: "",
+        isNewIdentifierLocation: false,
+        includes: [
+            {
+                name: "case 0n: ...",
+                source: completion.CompletionSource.SwitchCases,
+                sortText: completion.SortText.GlobalsOrKeywords,
+                insertText:
+`case 0n:
+case -1n:`,
+            },
+        ],
+        preferences: {
+            includeCompletionsWithInsertText: true,
+        },
+    },
+);