Reorganize the import_js example

examples/import_js/crate/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "import_js"
+version = "0.1.0"
+authors = ["The wasm-bindgen Developers"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wasm-bindgen = "0.2.40"

examples/import_js/crate/defined-in-js.js

@@ -0,0 +1,21 @@
+export function name() {
+    return 'World';
+}
+
+export class MyClass {
+    constructor() {
+        this._number = 42;
+    }
+
+    get number() {
+        return this._number;
+    }
+
+    set number(n) {
+        return this._number = n;
+    }
+
+    render() {
+        return `My number is: ${this.number}`;
+    }
+}

examples/import_js/crate/src/lib.rs

@@ -0,0 +1,35 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen(module = "/defined-in-js.js")]
+extern "C" {
+    fn name() -> String;
+
+    type MyClass;
+
+    #[wasm_bindgen(constructor)]
+    fn new() -> MyClass;
+
+    #[wasm_bindgen(method, getter)]
+    fn number(this: &MyClass) -> u32;
+    #[wasm_bindgen(method, setter)]
+    fn set_number(this: &MyClass, number: u32) -> MyClass;
+    #[wasm_bindgen(method)]
+    fn render(this: &MyClass) -> String;
+}
+
+// lifted from the `console_log` example
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+}
+
+#[wasm_bindgen(start)]
+pub fn run() {
+    log(&format!("Hello, {}!", name()));
+
+    let x = MyClass::new();
+    assert_eq!(x.number(), 42);
+    x.set_number(10);
+    log(&x.render());
+}