test: polyfill Float16Array on older Node.js for WPT

Author: ChALkeR

package.json

@@ -145,6 +145,7 @@
     "@exodus/prettier": "^1.0.0",
     "@exodus/test": "^1.0.0-rc.109",
     "@noble/hashes": "^2.0.1",
+    "@petamoriken/float16": "^3.9.3",
     "@scure/base": "^1.2.6",
     "@stablelib/base64": "^2.0.1",
     "@stablelib/hex": "^2.0.1",

pnpm-lock.yaml

@@ -350,7 +350,7 @@ export const encodeWptTest = {
         Uint16Array,
         Uint32Array,
         Uint8ClampedArray,
-        // Float16Array,
+        Float16Array,
         Float32Array,
         Float64Array,
       ].forEach((view) => {

tests/vendor/workerd/api/encoding_test.js

@@ -3,6 +3,12 @@ const { test, describe } = require('node:test')
 
 Object.assign(globalThis, { TextDecoder, TextEncoder })
 
+// Older but supported Node.js versions don't have Float16Array which is used in some tests
+if (!globalThis.Float16Array) {
+  const { Float16Array } = require('@petamoriken/float16')
+  Object.assign(globalThis, { Float16Array })
+}
+
 function run(title, tests) {
   describe(title, () => {
     for (const [name, obj] of Object.entries(tests)) {

tests/vendor/workerd/index.test.cjs

@@ -134,7 +134,6 @@
  "Float64Array"].forEach(type => {
   ["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
     test(() => {
-      if (!self[type]) return // Added, as old engines don't have e.g. Float16Array
       const viewInstance = new self[type](createBuffer(arrayBufferOrSharedArrayBuffer, 0));
       assert_throws_js(TypeError, () => new TextEncoder().encodeInto("", viewInstance));
     }, "Invalid encodeInto() destination: " + type + ", backed by: " + arrayBufferOrSharedArrayBuffer);

tests/wpt/fixtures/encoding/encodeInto.any.js

@@ -9,6 +9,12 @@ if (!globalThis.ReadableStream) {
   Object.assign(globalThis, { ReadableStream, WritableStream, TransformStream })
 }
 
+// Older but supported Node.js versions don't have Float16Array which is used in some tests
+if (!globalThis.Float16Array) {
+  const { Float16Array } = require('@petamoriken/float16')
+  Object.assign(globalThis, { Float16Array })
+}
+
 globalThis.self = globalThis
 
 globalThis.setup = (f) => f()