feat: add Reflect.construct

src/js.rs

@@ -988,6 +988,16 @@ extern "C" {
     /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/apply
     #[wasm_bindgen(static_method_of = Reflect, catch)]
     pub fn apply(target: &Function, this_argument: &JsValue, arguments_list: &Array) -> Result<JsValue, JsValue>;
+
+    /// The static Reflect.construct() method acts like the new operator, but as a function.
+    /// It is equivalent to calling new target(...args). It gives also the added option to 
+    /// specify a different prototype.
+    /// 
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/construct
+    #[wasm_bindgen(static_method_of = Reflect, catch)]
+    pub fn construct(target: &Function, arguments_list: &Array) -> Result<JsValue, JsValue>;
+    #[wasm_bindgen(static_method_of = Reflect, js_name = construct, catch)]
+    pub fn construct_with_new_target(target: &Function, arguments_list: &Array, new_target: &Function) -> Result<JsValue, JsValue>;
 }
 
 // Set

tests/all/js_globals/Reflect.rs

@@ -39,3 +39,128 @@ fn apply() {
         )
         .test()
 }
+
+#[test]
+fn construct() {
+    project()
+        .file(
+            "src/lib.rs",
+            r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn construct(target: &js::Function, arguments_list: &js::Array) -> JsValue {
+                let result = js::Reflect::construct(target, arguments_list);
+                let result = match result {
+                    Ok(val) => val,
+                    Err(_err) => "TypeError".into()
+                };
+                result
+            }
+        "#,
+        )
+        .file(
+            "test.ts",
+            r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                class Rectangle {
+                    public x: number;
+                    public y: number;
+
+                    constructor(x: number, y: number){
+                        this.x = x,
+                        this.y = y
+                    }
+
+                    static eq(x: number, y: number) { 
+                        return x === y;
+                    }
+
+                }
+
+                const args = [10, 10];
+
+                assert.equal(wasm.construct(Rectangle, args).x, 10);
+                assert.equal(wasm.construct('', args), "TypeError");
+            }
+        "#,
+        )
+        .test()
+}
+
+#[test]
+fn construct_with_new_target() {
+    project()
+        .file(
+            "src/lib.rs",
+            r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn construct_with_new_target(target: &js::Function, arguments_list: &js::Array, new_target: &js::Function) -> JsValue {
+                let result = js::Reflect::construct_with_new_target(target, arguments_list, new_target);
+                let result = match result {
+                    Ok(val) => val,
+                    Err(_err) => "TypeError".into()
+                };
+                result
+            }
+        "#,
+        )
+        .file(
+            "test.ts",
+            r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                class Rectangle {
+                    public x: number;
+                    public y: number;
+
+                    constructor(x: number, y: number){
+                        this.x = x,
+                        this.y = y
+                    }
+
+                    static eq(x: number, y: number) { 
+                        return x === y;
+                    }
+
+                }
+
+                class Rectangle2 {
+                    public x: number;
+                    public y: number;
+
+                    constructor(x: number, y: number){
+                        this.x = x,
+                        this.y = y
+                    }
+
+                    static eq(x: number, y: number) { 
+                        return x === y;
+                    }
+
+                }
+
+                const args = [10, 10];
+
+                assert.equal(wasm.construct_with_new_target(Rectangle, args, Rectangle2).x, 10);
+                assert.equal(wasm.construct_with_new_target(Rectangle, args, ''), "TypeError");
+            }
+        "#,
+        )
+        .test()
+}