remove "pxtrequire"

cmds/pxtrequire.ts

@@ -1,6 +0,0 @@
-/// <reference path="../node_modules/pxt-core/built/pxtlib.d.ts" />
-
-import * as path from "path";
-export let pxtCore = require("pxt-core");
-// require.resolve() gives path to [pxt dir]/built/pxt.js, so move up twice to get pxt root dir
-export let pxtCoreDir = path.resolve(require.resolve("pxt-core"), "..", "..");

package.json

@@ -30,8 +30,6 @@
     "docs/*/*.md",
     "docs/*/*/*.md"
   ],
-  "main": "built/pxtrequire.js",
-  "typings": "built/pxtrequire.d.ts",
   "devDependencies": {
     "typescript": "2.6.1",
     "semantic-ui-less": "2.2.14",