vendor tsgo

tools/tsgo/internal/fourslash/tests/manual/completionsInMapConstructorNoCrash_test.go

@@ -0,0 +1,49 @@
+package fourslash_test
+
+import (
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/fourslash"
+	. "github.com/microsoft/typescript-go/internal/fourslash/tests/util"
+	"github.com/microsoft/typescript-go/internal/testutil"
+)
+
+// Test for issue: Completions crash in call to `new Map(...)`.
+// When requesting completions inside a Map constructor's array literal,
+// IndexOfNode returns -1 causing a panic in getContextualTypeForElementExpression
+// when trying to access array elements without a bounds check.
+func TestCompletionsInMapConstructorNoCrash(t *testing.T) {
+	t.Parallel()
+
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+
+	// Test completion at position /*a*/ - before the string literal
+	const content1 = `const m = new Map([
+    [/*a*/'0', ['0', false]],
+]);`
+	f1, done1 := fourslash.NewFourslash(t, nil /*capabilities*/, content1)
+	defer done1()
+	// Just verify that completions don't crash - accept any completion list
+	f1.VerifyCompletions(t, "a", &fourslash.CompletionsExpectedList{
+		ItemDefaults: &fourslash.CompletionsExpectedItemDefaults{
+			CommitCharacters: &DefaultCommitCharacters,
+			EditRange:        Ignored,
+		},
+		Items: &fourslash.CompletionsExpectedItems{},
+	})
+
+	// Test completion at position /*b*/ - after the array literal
+	const content2 = `const m = new Map([
+    ['0', ['0', false]]/*b*/,
+]);`
+	f2, done2 := fourslash.NewFourslash(t, nil /*capabilities*/, content2)
+	defer done2()
+	// Just verify that completions don't crash - accept any completion list
+	f2.VerifyCompletions(t, "b", &fourslash.CompletionsExpectedList{
+		ItemDefaults: &fourslash.CompletionsExpectedItemDefaults{
+			CommitCharacters: &DefaultCommitCharacters,
+			EditRange:        Ignored,
+		},
+		Items: &fourslash.CompletionsExpectedItems{},
+	})
+}