Remove some triple-slash references

src/lib/readable-stream/async-iterator.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2018.asynciterable" />
-
 import { ReadableStream } from '../readable-stream';
 import {
   AcquireReadableStreamDefaultReader,

src/stub/math-trunc.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2015.core" />
-
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
 const MathTrunc: typeof Math.trunc = Math.trunc || function (v) {
   return v < 0 ? Math.ceil(v) : Math.floor(v);

src/stub/number-isfinite.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2015.core" />
-
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
 const NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {
   return typeof x === 'number' && isFinite(x);

src/stub/number-isinteger.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2015.core" />
-
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger#Polyfill
 const NumberIsInteger: typeof Number.isInteger = Number.isInteger || function (value) {
   return typeof value === 'number'

src/stub/number-isnan.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2015.core" />
-
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
 const NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {
   // eslint-disable-next-line no-self-compare

src/stub/symbol.ts

@@ -1,5 +1,3 @@
-/// <reference lib="es2015.symbol" />
-
 const SymbolPolyfill: (description?: string) => symbol
   = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol'
     ? Symbol

tsconfig.json

@@ -5,8 +5,10 @@
     "moduleResolution": "node",
     "lib": [
       "es5",
+      "es2015.core",
       "es2015.promise",
       "es2015.symbol",
+      "es2015.symbol.wellknown",
       "es2018.asynciterable"
     ],
     "newLine": "lf",