git · Dhruv-0-Arora · Mar 22, 2026 · Mar 25, 2026
diff --git a/t/t4018/typescript-class-method b/t/t4018/typescript-class-method
@@ -0,0 +1,7 @@
+export class RIGHT {
+    unique = 0
+    constructor () {
+        this.doNothing()
+    }
+    function ChangeMe() { }
+}
diff --git a/t/t4018/typescript-export-default-class b/t/t4018/typescript-export-default-class
@@ -0,0 +1,7 @@
+export default class RIGHT {
+	private x = 0;
+	private y = 0;
+	private z = 0;
+	// ChangeMe
+	render() {}
+}
diff --git a/t/t4018/typescript-export-function b/t/t4018/typescript-export-function
@@ -0,0 +1,7 @@
+export async function RIGHT(url: string): Promise<string> {
+	const a = 1;
+	const b = 2;
+	const c = 3;
+	ChangeMe
+	return url;
+}
diff --git a/userdiff.c b/userdiff.c
@@ -354,6 +354,21 @@ PATTERNS("scheme",
 	 "|([^][)(}{[ \t])+"),
 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 	 "\\\\[a-zA-Z@]+|\\\\.|([a-zA-Z0-9]|[^\x01-\x7f])+"),
+PATTERNS("typescript",
+	/* Starting with optional whitespace */
+	"^[ \t]*"
+	"("
+	/* Followed by an optional export and/or async and/or default keyword */
+	"(export[ \t]+)?(default[ \t]+)?(async[ \t]+)?"
+	/* Followed by either a function or class declaration */
+	"((function|class)[ \t]+[a-zA-Z_][a-zA-Z0-9_]*[^{]*)"
+	/* or */
+	"|"
+	/* a variable declaration with const, let, or var */
+	"^(const|let|var)[ \\t]+[a-zA-Z_][a-zA-Z0-9_]*[ \\t]*="
+	")",
+	/* -- */
+	"[a-zA-Z_][a-zA-Z0-9_]*"),
 { .name = "default", .binary = -1 },
 };
 #undef PATTERNS