lib: handle Float16Array in node:v8 serdes

PR-URL: #55996
Fixes: #55574
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: LiviaMedeiros <livia@cirno.name>

Author: bartlomieju

lib/eslint.config_partial.mjs

@@ -347,6 +347,11 @@ export default [
           name: 'SubtleCrypto',
           message: "Use `const { SubtleCrypto } = require('internal/crypto/webcrypto');` instead of the global.",
         },
+        // Float16Array is not available in primordials because it's only available with --js-float16array CLI flag.
+        {
+          name: 'Float16Array',
+          message: 'Use `const { Float16Array } = globalThis;` instead of the global.',
+        },
       ],
       'no-restricted-modules': [
         'error',

lib/v8.js

@@ -31,6 +31,9 @@ const {
   Uint32Array,
   Uint8Array,
   Uint8ClampedArray,
+  globalThis: {
+    Float16Array,
+  },
 } = primordials;
 
 const { Buffer } = require('buffer');
@@ -63,6 +66,7 @@ const {
 } = require('internal/heap_utils');
 const promiseHooks = require('internal/promise_hooks');
 const { getOptionValue } = require('internal/options');
+
 /**
  * Generates a snapshot of the current V8 heap
  * and writes it to a JSON file.
@@ -289,6 +293,7 @@ function arrayBufferViewTypeToIndex(abView) {
   // Index 10 is FastBuffer.
   if (type === '[object BigInt64Array]') return 11;
   if (type === '[object BigUint64Array]') return 12;
+  if (type === '[object Float16Array]') return 13;
   return -1;
 }
 
@@ -306,6 +311,7 @@ function arrayBufferViewIndexToType(index) {
   if (index === 10) return FastBuffer;
   if (index === 11) return BigInt64Array;
   if (index === 12) return BigUint64Array;
+  if (index === 13) return Float16Array;
   return undefined;
 }
 

test/parallel/test-v8-serdes.js

@@ -1,4 +1,4 @@
-// Flags: --expose-internals
+// Flags: --expose-internals --js-float16array
 
 'use strict';
 
@@ -7,6 +7,9 @@ const { internalBinding } = require('internal/test/binding');
 const assert = require('assert');
 const v8 = require('v8');
 const os = require('os');
+// TODO(bartlomieju): once `Float16Array` is available in stable V8,
+// remove this line and `--js-float16array` flag up top
+const { Float16Array } = globalThis;
 
 const circular = {};
 circular.circular = circular;
@@ -26,6 +29,7 @@ const objects = [
   Buffer.from([1, 2, 3, 4]),
   new BigInt64Array([42n]),
   new BigUint64Array([42n]),
+  new Float16Array([1, 2, 3, 4]),
   undefined,
   null,
   42,