add JS::Object#to_s method

Author: kateinoigakukun

ext/js/js-core.c

@@ -411,6 +411,7 @@ void Init_js() {
   rb_define_method(rb_cJS_Object, "__export_to_js", _rb_js_export_to_js, 0);
   rb_define_singleton_method(rb_cJS_Object, "__import_from_js", _rb_js_import_from_js, 0);
   rb_define_method(rb_cJS_Object, "inspect", _rb_js_obj_inspect, 0);
+  rb_define_method(rb_cJS_Object, "to_s", _rb_js_obj_inspect, 0);
   rb_define_singleton_method(rb_cJS_Object, "wrap", _rb_js_obj_wrap, 1);
 
   rb_define_method(rb_cInteger, "to_js", _rb_js_integer_to_js, 0);

packages/npm-packages/ruby-wasm-wasi/test/js_from_rb.test.ts

@@ -64,6 +64,16 @@ describe("Manipulation of JS from Ruby", () => {
     expect(vm.eval(result).toString()).toBe(String(props.result));
   });
 
+  test.each([
+    `24`, `"hello"`, `null`, `undefined`,
+  ])("JS::Object#to_s (%s)", async (value) => {
+    const vm = await initRubyVM();
+    const to_s_result = `require "js"; JS.eval('return ${value}').to_s`;
+    const inspect_result = `require "js"; JS.eval('return ${value}').inspect`;
+    expect(vm.eval(to_s_result).toString()).toBe(String(eval(value)));
+    expect(vm.eval(inspect_result).toString()).toBe(String(eval(value)));
+  });
+
   test.each([
     { expr: "JS.global[:Object]", result: Object },
     { expr: "JS.global[:Object][:keys]", result: Object.keys },