Converts tests to TypeScript (#300)

packages/util-crypto/src/random/asHex.ts

@@ -8,7 +8,6 @@ import randomAsU8a from './asU8a';
 
 /**
  * @name randomAsHex
- * @signature randomAsHex (length?: number = 32): string
  * @summary Creates a hex string filled with random bytes.
  * @description
  * Returns a hex string with the specified (optional) length filled with random bytes.

packages/util-crypto/src/random/asNumber.ts

@@ -11,7 +11,6 @@ const BN_53 = new BN(0b11111111111111111111111111111111111111111111111111111);
 
 /**
  * @name randomAsNumber
- * @signature randomAsNumber (): number
  * @summary Creates a random number from random bytes.
  * @description
  * Returns a random number generated from the secure bytes.

packages/util-crypto/src/random/asU8a.ts

@@ -6,7 +6,6 @@ import nacl from 'tweetnacl';
 
 /**
  * @name randomAsU8a
- * @signature randomAsU8a (length?: number = 32): Uint8Array
  * @summary Creates a Uint8Array filled with random bytes.
  * @description
  * Returns a `Uint8Array` with the specified (optional) length filled with random bytes.