diff --git a/js-beautify/js-beautify.d.ts b/js-beautify/js-beautify.d.ts
new file mode 100644
index 000000000..87ede5737
--- /dev/null
+++ b/js-beautify/js-beautify.d.ts
@@ -0,0 +1,29 @@
+// Type definitions for js_beautify
+// Project: https://github.com/beautify-web/js-beautify/
+// Definitions by: Josh Goldberg <https://github.com/JoshuaKGoldberg/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare var js_beautify: {
+    (js_source_text: string, options?: {
+        "indent_size"?: number;
+        "indent_char"?: string;
+        "eol"?: string;
+        "indent_level"?: number;
+        "indent_width_tabs"?: boolean;
+        "preserve_newlines"?: boolean;
+        "max_preserve_newlines"?: number;
+        "jslint_happy": boolean;
+        "space_after_anon_function": boolean;
+        "brace_style": string;
+        "keep_array_indentation": boolean;
+        "keep_function_indentation": boolean;
+        "space_before_conditional": boolean;
+        "break_chained_methods": boolean;
+        "eval_code": boolean;
+        "unescape_strings": boolean;
+        "wrap_line_length": number;
+        "wrap_attributes": string;
+        "wrap_attributes_indent_size": number;
+        "end_with_newline": boolean;
+    }): string;
+};