refactor: remove text-encoding polyfill

Node supports WHATWG Encoding Standard.
Node 11+ exports TextEncoder and TextDecoder in global scope.
In lower versions, both classes are exported under util module.

Note: we use "require" import of util because it seems that "import"
imports a no-buil-in "util" package. More investigation is required.

Fixes #171

README.md

@@ -63,10 +63,10 @@ npm install netflux
 npm install rxjs
 ```
 
-- `ws` and `text-encoding` if you target NodeJS (developing a bot):
+- `ws` if you target NodeJS (developing a bot):
 
 ```shell
-npm install ws text-encoding
+npm install ws
 ```
 
 **Why peer dependencies?**

karma.conf.js

@@ -35,11 +35,11 @@ module.exports = (config) => {
         lib: ['es2017', 'dom'],
         moduleResolution: 'node',
         downlevelIteration: true,
-        types: ['node', 'text-encoding'],
+        types: ['node'],
         allowJs: true,
       },
       bundlerOptions: {
-        exclude: ['wrtc', 'text-encoding', 'util', 'ws', 'url', 'crypto'],
+        exclude: ['wrtc', 'util', 'ws', 'url', 'crypto'],
         noParse: ['webrtc-adapter/out/adapter_no_edge_no_global.js'],
         addNodeGlobals: false,
       },

package.json

@@ -52,7 +52,6 @@
   },
   "peerDependencies": {
     "rxjs": "^6.2.0",
-    "text-encoding": "^0.7.0",
     "ws": "^7.2.2"
   },
   "devDependencies": {
@@ -61,7 +60,6 @@
     "@rollup/plugin-commonjs": "^11.0.0",
     "@rollup/plugin-node-resolve": "^7.1.0",
     "@types/jasmine": "^3.5.8",
-    "@types/text-encoding": "0.0.35",
     "@types/ws": "^7.2.2",
     "esdoc": "^1.1.0",
     "esdoc-inject-style-plugin": "^1.0.0",
@@ -92,7 +90,6 @@
     "rxjs": "^6.3.2",
     "semantic-release": "^17.0.4",
     "sigver": "^20.0.2",
-    "text-encoding": "^0.7.0",
     "travis-deploy-once": "^5.0.7",
     "tslib": "^1.11.1",
     "typescript": "^3.8.3",

rollup.config.js

@@ -45,7 +45,7 @@ export default [
         sourcemap: true,
       },
     ],
-    external: ['url', 'crypto', 'ws', 'text-encoding', 'util'],
+    external: ['url', 'crypto', 'ws', 'util'],
     plugins: [
       typescript(),
       resolve({ preferBuiltins: true }),
@@ -81,7 +81,7 @@ export default [
       format: 'es',
       sourcemap: true,
     },
-    external: ['url', 'crypto', 'ws', 'text-encoding', 'uil', 'rxjs', 'rxjs/operators'],
+    external: ['url', 'crypto', 'ws', 'uil', 'rxjs', 'rxjs/operators'],
     plugins: [
       typescript(tsConfigDeclaration),
       resolve({ preferBuiltins: true }),

src/misc/polyfills.node.ts

@@ -1,6 +1,6 @@
 import * as crypto from 'crypto'
-import { TextDecoder, TextEncoder } from 'text-encoding'
 import * as WebSocket from 'ws'
+const util = require('util')
 
 import { env } from './env'
 
@@ -13,6 +13,6 @@ import { env } from './env'
 //   console.warn(err.message)
 // }
 env.WebSocket = WebSocket as any
-env.TextEncoder = TextEncoder
-env.TextDecoder = TextDecoder
+env.TextEncoder = util.TextEncoder
+env.TextDecoder = util.TextDecoder
 env.cryptoNode = crypto

tsconfig.json

@@ -5,7 +5,7 @@
     "lib": ["es2017", "dom"],
     "moduleResolution": "node",
     "downlevelIteration": true,
-    "types": ["node", "text-encoding"],
+    "types": ["node"],
     "strict": true,
     "noUnusedLocals": true,
     "noUnusedParameters": false,