Simplify createBoundary string generator.

Author: octet-stream

lib/Encoder.ts

@@ -65,7 +65,7 @@ export class Encoder {
    *
    * const encoder = new Encoder(fd)
    */
-  constructor(form: FormDataLike, boundary: string = createBoundary(8)) {
+  constructor(form: FormDataLike, boundary: string = createBoundary(16)) {
     if (!isFormData(form)) {
       throw new TypeError("Expected first argument to be a FormData instance.")
     }

lib/index.ts

@@ -4,3 +4,4 @@ export * from "./Encoder"
 
 export {default as isFileLike} from "./util/isFile"
 export {default as isFormDataLike} from "./util/isFormData"
+export {default as createBoundary} from "./util/createBoundary"

lib/util/createBoundary.ts

@@ -1,10 +1,17 @@
-import {randomBytes} from "crypto"
+const alphabet
+  = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 
 /**
  * Generates a boundary string for FormData encoder.
  */
-const createBoundary = (size: number): string => (
-  randomBytes(size).toString("hex")
-)
+function createBoundary(size: number): string {
+  let res = ""
+
+  while (size--) {
+    res += alphabet[Math.floor(Math.random() * alphabet.length)]
+  }
+
+  return res
+}
 
 export default createBoundary