Add webidl for Blob arraybuffer / text (#2008)

crates/web-sys/tests/wasm/blob.js

@@ -0,0 +1,3 @@
+export function new_blob() {
+  return new Blob([ 1, 2, 3 ]);
+}

crates/web-sys/tests/wasm/blob.rs

@@ -0,0 +1,65 @@
+use js_sys::{Array, ArrayBuffer};
+use wasm_bindgen::prelude::*;
+use wasm_bindgen::JsCast;
+use wasm_bindgen_futures::JsFuture;
+use wasm_bindgen_test::*;
+use web_sys::Blob;
+
+#[wasm_bindgen(module = "/tests/wasm/blob.js")]
+extern "C" {
+    fn new_blob() -> Blob;
+}
+
+#[wasm_bindgen_test]
+fn test_blob_from_js() {
+    let blob = new_blob();
+    assert!(blob.is_instance_of::<Blob>());
+    assert_eq!(blob.size(), 3.0);
+}
+
+#[wasm_bindgen_test]
+fn test_blob_from_bytes() {
+    let bytes = Array::new();
+    bytes.push(&1.into());
+    bytes.push(&2.into());
+    bytes.push(&3.into());
+
+    let blob = Blob::new_with_u8_array_sequence(&bytes.into()).unwrap();
+    assert!(blob.is_instance_of::<Blob>());
+    assert_eq!(blob.size(), 3.0);
+}
+
+#[wasm_bindgen_test]
+fn test_blob_empty() {
+    let blob = Blob::new().unwrap();
+    assert!(blob.is_instance_of::<Blob>());
+    assert_eq!(blob.size(), 0.0);
+}
+
+#[wasm_bindgen_test]
+async fn test_blob_array_buffer() {
+    let bytes = Array::new();
+    bytes.push(&1.into());
+    bytes.push(&2.into());
+    bytes.push(&3.into());
+
+    let blob = Blob::new_with_u8_array_sequence(&bytes.into()).unwrap();
+
+    let buffer: ArrayBuffer = JsFuture::from(blob.array_buffer()).await.unwrap().into();
+
+    assert!(blob.is_instance_of::<Blob>());
+    assert!(buffer.is_instance_of::<ArrayBuffer>());
+    assert_eq!(blob.size(), buffer.byte_length() as f64);
+}
+
+#[wasm_bindgen_test]
+async fn test_blob_text() {
+    let strings = Array::new();
+    strings.push(&"hello".into());
+
+    let blob = Blob::new_with_str_sequence(&strings.into()).unwrap();
+    let string = JsFuture::from(blob.text()).await.unwrap();
+
+    assert!(blob.is_instance_of::<Blob>());
+    assert_eq!(string, "hello")
+}

crates/web-sys/tests/wasm/main.rs

@@ -8,6 +8,7 @@ pub mod anchor_element;
 pub mod body_element;
 pub mod br_element;
 pub mod button_element;
+pub mod blob;
 pub mod console;
 pub mod div_element;
 pub mod element;

crates/web-sys/webidls/enabled/Blob.webidl

@@ -28,6 +28,9 @@ interface Blob {
   Blob slice([Clamp] optional long long start,
              [Clamp] optional long long end,
              optional DOMString contentType);
+
+  [NewObject] Promise<DOMString> text();
+  [NewObject] Promise<ArrayBuffer> arrayBuffer();
 };
 
 enum EndingTypes { "transparent", "native" };