feat(fomdata): added support for spec-compliant FormData & Blob types; (#5316)

lib/utils.js

@@ -512,7 +512,7 @@ const matchAll = (regExp, str) => {
 const isHTMLForm = kindOfTest('HTMLFormElement');
 
 const toCamelCase = str => {
-  return str.toLowerCase().replace(/[_-\s]([a-z\d])(\w*)/g,
+  return str.toLowerCase().replace(/[-_\s]([a-z\d])(\w*)/g,
     function replacer(m, p1, p2) {
       return p1.toUpperCase() + p2;
     }
@@ -596,6 +596,37 @@ const toFiniteNumber = (value, defaultValue) => {
   return Number.isFinite(value) ? value : defaultValue;
 }
 
+const ALPHA = 'abcdefghijklmnopqrstuvwxyz'
+
+const DIGIT = '0123456789';
+
+const ALPHABET = {
+  DIGIT,
+  ALPHA,
+  ALPHA_DIGIT: ALPHA + ALPHA.toUpperCase() + DIGIT
+}
+
+const generateString = (size = 16, alphabet = ALPHABET.ALPHA_DIGIT) => {
+  let str = '';
+  const {length} = alphabet;
+  while (size--) {
+    str += alphabet[Math.random() * length|0]
+  }
+
+  return str;
+}
+
+/**
+ * If the thing is a FormData object, return true, otherwise return false.
+ *
+ * @param {unknown} thing - The thing to check.
+ *
+ * @returns {boolean}
+ */
+function isSpecCompliantForm(thing) {
+  return !!(thing && isFunction(thing.append) && thing[Symbol.toStringTag] === 'FormData' && thing[Symbol.iterator]);
+}
+
 const toJSONObject = (obj) => {
   const stack = new Array(10);
 
@@ -673,5 +704,8 @@ export default {
   findKey,
   global: _global,
   isContextDefined,
+  ALPHABET,
+  generateString,
+  isSpecCompliantForm,
   toJSONObject
 };