chore: minor hardening

Author: ChALkeR

assert.js

@@ -8,7 +8,7 @@ const makeMessage = (name, extra) => `Expected${name ? ` ${name} to be` : ''} an
 const TypedArray = Object.getPrototypeOf(Uint8Array)
 
 export function assertTypedArray(arr) {
-  if (arr instanceof TypedArray) return
+  if (arr && arr instanceof TypedArray) return
   throw new TypeError('Expected a TypedArray instance')
 }
 

base64.js

@@ -74,6 +74,7 @@ export function fromBase64url(str, options) {
 
 // By default accepts both padded and non-padded variants, base64 or base64url
 export function fromBase64any(str, { format = 'uint8', padding = 'both', ...rest } = {}) {
+  if (typeof str !== 'string') throw new TypeError(E_STRING)
   const isBase64url = !str.includes('+') && !str.includes('/') // likely to fail fast, as most input is non-url, also double scan is faster than regex
   return fromBase64common(str, isBase64url, padding, format, rest)
 }

fallback/_utils.js

@@ -7,7 +7,8 @@ export function assert(condition, msg) {
 }
 
 export function assertU8(arg) {
-  if (!(arg instanceof Uint8Array)) throw new TypeError('Expected an Uint8Array')
+  if (arg && arg instanceof Uint8Array) return
+  throw new TypeError('Expected an Uint8Array')
 }
 
 // On arrays in heap (<= 64) it's cheaper to copy into a pooled buffer than lazy-create the ArrayBuffer storage