feat: Deno.core.{encode,decode}; standalone UTF-8 encoding/decoding (#4349)

This commits add two new methods to "Deno.core" namespace: "encode" and "decode".

Those methods are bound in Rust to provide a) fast b) generally available of encoding and decoding UTF-8 strings. 

Both methods are now used in "cli/js/dispatch_json.ts".

1 files changed, 2 insertions, 3 deletions

diff --git a/cli/js/ops/dispatch_json.ts b/cli/js/ops/dispatch_json.ts
index 4aa1f6b8b..9ff0f13f5 100644
--- a/cli/js/ops/dispatch_json.ts
+++ b/cli/js/ops/dispatch_json.ts
@@ -1,6 +1,5 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as util from "../util.ts";
-import { TextEncoder, TextDecoder } from "../web/text_encoding.ts";
 import { core } from "../core.ts";
 import { OPS_CACHE } from "../runtime.ts";
 import { ErrorKind, getErrorClass } from "../errors.ts";
@@ -30,13 +29,13 @@ function nextPromiseId(): number {
 }
 
 function decode(ui8: Uint8Array): JsonResponse {
-  const s = new TextDecoder().decode(ui8);
+  const s = core.decode(ui8);
   return JSON.parse(s) as JsonResponse;
 }
 
 function encode(args: object): Uint8Array {
   const s = JSON.stringify(args);
-  return new TextEncoder().encode(s);
+  return core.encode(s);
 }
 
 function unwrapResponse(res: JsonResponse): Ok {