TextEncoder allows non-Uint8Array Buffers (#596)

* TextEncoder allows non-Uint8Array Buffers

* Add eslintrc to eslintignore

packages/util/src/bn/toU8a.spec.ts

@@ -10,7 +10,7 @@ describe('bnToU8a', (): void => {
   it('converts null values to 0x00', (): void => {
     expect(
       bnToU8a(null, -1, false)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('converts null values to 0x00000000 (bitLength)', (): void => {

packages/util/src/bn/toU8a.ts

@@ -43,7 +43,7 @@ function bnToU8a (value: BN | BigInt | number | null, arg1: number | Options = {
 
   if (!value) {
     return _options.bitLength === -1
-      ? new Uint8Array([])
+      ? new Uint8Array()
       : new Uint8Array(byteLength);
   }
 

packages/util/src/buffer/toU8a.spec.ts

@@ -8,7 +8,7 @@ describe('bufferToU8a', (): void => {
   it('returns an empty buffer when null provided', (): void => {
     expect(
       bufferToU8a(null)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('returns a Uint8Buffer with the correct values', (): void => {

packages/util/src/buffer/toU8a.ts

@@ -17,9 +17,5 @@
  * ```
  */
 export default function bufferToU8a (buffer?: Buffer | number[] | null): Uint8Array {
-  if (!buffer) {
-    return new Uint8Array([]);
-  }
-
-  return new Uint8Array(buffer);
+  return new Uint8Array(buffer || []);
 }

packages/util/src/hex/toU8a.ts

@@ -23,7 +23,7 @@ import hexStripPrefix from './stripPrefix';
  */
 export default function hexToU8a (_value?: string | null, bitLength = -1): Uint8Array {
   if (!_value) {
-    return new Uint8Array([]);
+    return new Uint8Array();
   }
 
   assert(isHex(_value), `Expected hex value to convert, found '${_value}'`);

packages/util/src/is/u8a.spec.ts

@@ -19,7 +19,7 @@ describe('isUint8Array', (): void => {
 
   it('returns true on Uint8Array values', (): void => {
     expect(
-      isU8a(new Uint8Array([]))
+      isU8a(new Uint8Array())
     ).toEqual(true);
   });
 });

packages/util/src/number/toU8a.spec.ts

@@ -8,25 +8,25 @@ describe('numberToU8a', (): void => {
   it('converts 0 to empty', (): void => {
     expect(
       numberToU8a(0)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('converts undefined to empty', (): void => {
     expect(
       numberToU8a()
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('converts null to empty', (): void => {
     expect(
       numberToU8a(null)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('converts NaN to empty', (): void => {
     expect(
       numberToU8a(NaN)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('converts values to the u8a', (): void => {

packages/util/src/number/toU8a.ts

@@ -21,7 +21,7 @@ import numberToHex from './toHex';
  */
 export default function numberToU8a (value?: number | null, bitLength = -1): Uint8Array {
   if (!value || isNaN(value)) {
-    return new Uint8Array([]);
+    return new Uint8Array();
   }
 
   return hexToU8a(

packages/util/src/polyfill/textEncoder.ts

@@ -4,8 +4,23 @@
 
 if (typeof TextEncoder === 'undefined') {
   try {
+    const UTE = require('util').TextEncoder;
+
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    (global as any).TextEncoder = require('util').TextEncoder;
+    (global as any).TextEncoder = class TextEncoder {
+      #encoder: TextEncoder;
+
+      constructor () {
+        this.#encoder = new UTE();
+      }
+
+      // For a Jest 26.0.1 environment, Buffer !== Uint8Array
+      encode (value: string): Uint8Array {
+        const encoded = this.#encoder.encode(value);
+
+        return Uint8Array.from(encoded);
+      }
+    };
   } catch (error) {
     // noop
   }

packages/util/src/string/toU8a.spec.ts

@@ -8,7 +8,7 @@ describe('stringToU8a', (): void => {
   it('decodes to an empty string for undefined', (): void => {
     expect(
       stringToU8a()
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('encodes the string correctly', (): void => {

packages/util/src/string/toU8a.ts

@@ -39,5 +39,5 @@ try {
 export default function stringToU8a (value?: string): Uint8Array {
   return value
     ? encoder.encode(value)
-    : new Uint8Array([]);
+    : new Uint8Array();
 }

packages/util/src/u8a/toBn.spec.ts

@@ -33,7 +33,7 @@ describe('u8aToBn', (): void => {
   it('converts empty', (): void => {
     expect(
       u8aToBn(
-        new Uint8Array([]),
+        new Uint8Array(),
         { isLe: true }
       ).toString(16)
     ).toBe('0');

packages/util/src/u8a/toString.spec.ts

@@ -13,7 +13,7 @@ describe('u8aToString', (): void => {
 
   it('decodes to an empty string for empty buffer', (): void => {
     expect(
-      u8aToString(new Uint8Array([]))
+      u8aToString(new Uint8Array())
     ).toEqual('');
   });