[GENERAL][FIXED] - Fix WHATWG spec violations in URL and URLSearchParams polyfills

packages/react-native/Libraries/Blob/URL.js

@@ -123,8 +123,8 @@ export class URL {
   }
 
   get hash(): string {
-    const hashMatch = this._url.match(/#([^/]*)/);
-    return hashMatch ? `#${hashMatch[1]}` : '';
+    const hashIndex = this._url.indexOf('#');
+    return hashIndex !== -1 ? this._url.slice(hashIndex) : '';
   }
 
   get host(): string {

packages/react-native/Libraries/Blob/URLSearchParams.js

@@ -14,7 +14,11 @@ export class URLSearchParams {
   _searchParams: Map<string, string[]> = new Map();
 
   get size(): number {
-    return this._searchParams.size;
+    let count = 0;
+    for (const values of this._searchParams.values()) {
+      count += values.length;
+    }
+    return count;
   }
 
   constructor(params?: Record<string, string> | string | [string, string][]) {
@@ -33,9 +37,11 @@ export class URLSearchParams {
           if (!pair) {
             return;
           }
-          const [key, value] = pair
-            .split('=')
-            .map(part => decodeURIComponent(part.replace(/\+/g, ' ')));
+          const eqIndex = pair.indexOf('=');
+          const rawKey = eqIndex === -1 ? pair : pair.slice(0, eqIndex);
+          const rawValue = eqIndex === -1 ? '' : pair.slice(eqIndex + 1);
+          const key = decodeURIComponent(rawKey.replace(/\+/g, ' '));
+          const value = decodeURIComponent(rawValue.replace(/\+/g, ' '));
           this.append(key, value);
         });
     } else if (Array.isArray(params)) {

packages/react-native/Libraries/Blob/__tests__/URL-test.js

@@ -110,7 +110,7 @@ describe('URL', function () {
       ['key1', 'value2'],
       ['key2', 'value3'],
     ]);
-    expect(paramsFromArray.size).toBe(2);
+    expect(paramsFromArray.size).toBe(3);
     expect(paramsFromArray.getAll('key1')).toEqual(['value1', 'value2']);
     expect(paramsFromArray.get('key2')).toBe('value3');