fix: Float16Array support (#23512)

Ref #23490, #23277

* remove `--js-float16array` flag (This flag has already added to
deno_core)
* add some `Float16Array` support

6 files changed, 15 insertions, 9 deletions

diff --git a/cli/main.rs b/cli/main.rs
index 6efad7cd4..a4e93ca31 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -385,7 +385,7 @@ fn resolve_flags_and_init(
     // Using same default as VSCode:
     // https://github.com/microsoft/vscode/blob/48d4ba271686e8072fc6674137415bc80d936bc7/extensions/typescript-language-features/src/configuration/configuration.ts#L213-L214
     DenoSubcommand::Lsp => vec!["--max-old-space-size=3072".to_string()],
-    _ => vec!["--js-float16array".to_string()],
+    _ => vec![],
   };
 
   init_v8_flags(&default_v8_flags, &flags.v8_flags, get_v8_flags_from_env());
diff --git a/ext/node/polyfills/internal/util/types.ts b/ext/node/polyfills/internal/util/types.ts
index 30a25e2e5..b8aca5968 100644
--- a/ext/node/polyfills/internal/util/types.ts
+++ b/ext/node/polyfills/internal/util/types.ts
@@ -58,6 +58,10 @@ export function isBigUint64Array(value: unknown): value is BigUint64Array {
   return TypedArrayPrototypeGetSymbolToStringTag(value) === "BigUint64Array";
 }
 
+export function isFloat16Array(value: unknown): value is Float16Array {
+  return TypedArrayPrototypeGetSymbolToStringTag(value) === "Float16Array";
+}
+
 export function isFloat32Array(value: unknown): value is Float32Array {
   return TypedArrayPrototypeGetSymbolToStringTag(value) === "Float32Array";
 }
diff --git a/ext/web/02_structured_clone.js b/ext/web/02_structured_clone.js
index 84829c313..776a8ee96 100644
--- a/ext/web/02_structured_clone.js
+++ b/ext/web/02_structured_clone.js
@@ -36,7 +36,6 @@ const {
   Uint16Array,
   Uint32Array,
   BigUint64Array,
-  Float16Array,
   Float32Array,
   Float64Array,
 } = primordials;
@@ -59,7 +58,7 @@ function cloneArrayBuffer(
   );
 }
 
-// TODO(petamoriken): Resizable ArrayBuffer support in the future
+// TODO(petamoriken): add Resizable ArrayBuffer support
 /** Clone a value in a similar way to structured cloning. It is similar to a
  * StructureDeserialize(StructuredSerialize(...)). */
 function structuredClone(value) {
@@ -117,6 +116,7 @@ function structuredClone(value) {
         Constructor = BigUint64Array;
         break;
       case "Float16Array":
+        // TODO(petamoriken): add Float16Array to primordials
         Constructor = Float16Array;
         break;
       case "Float32Array":
diff --git a/ext/web/06_streams.js b/ext/web/06_streams.js
index cdee1a9dc..e0e3ccbbe 100644
--- a/ext/web/06_streams.js
+++ b/ext/web/06_streams.js
@@ -1995,6 +1995,10 @@ function readableByteStreamControllerPullInto(
       case "Uint32Array":
         ctor = Uint32Array;
         break;
+      case "Float16Array":
+        // TODO(petamoriken): add Float16Array to primordials
+        ctor = Float16Array;
+        break;
       case "Float32Array":
         ctor = Float32Array;
         break;
diff --git a/ext/webidl/00_webidl.js b/ext/webidl/00_webidl.js
index 6cf2c5f8c..6bf6714c6 100644
--- a/ext/webidl/00_webidl.js
+++ b/ext/webidl/00_webidl.js
@@ -525,6 +525,8 @@ ArrayPrototypeForEach(
     Uint16Array,
     Uint32Array,
     Uint8ClampedArray,
+    // TODO(petamoriken): add Float16Array converter
+    // Float16Array,
     Float32Array,
     Float64Array,
   ],
diff --git a/tests/wpt/runner/expectation.json b/tests/wpt/runner/expectation.json
index 48f1db0f4..f20cd78f1 100644
--- a/tests/wpt/runner/expectation.json
+++ b/tests/wpt/runner/expectation.json
@@ -7158,12 +7158,8 @@
         "response-from-stream.any.worker.html": true,
         "response-cancel-stream.any.html": true,
         "response-cancel-stream.any.worker.html": true,
-        "response-clone.any.html": [
-          "Check response clone use structureClone for teed ReadableStreams (Float16Arraychunk)"
-        ],
-        "response-clone.any.worker.html": [
-          "Check response clone use structureClone for teed ReadableStreams (Float16Arraychunk)"
-        ],
+        "response-clone.any.html": true,
+        "response-clone.any.worker.html": true,
         "response-consume-empty.any.html": [
           "Consume empty FormData response body as text"
         ],