[Breaking] remove core/isCore in favor of is-core-module package

Author: ljharb

index.js

@@ -1,6 +1,4 @@
 var async = require('./lib/async');
-async.core = require('./lib/core');
-async.isCore = require('./lib/is-core');
 async.sync = require('./lib/sync');
 
 module.exports = async;

index.mjs

@@ -1,8 +1,4 @@
 import async from 'resolve/async';
 import sync from 'resolve/sync';
-import core from 'resolve/core';
-import isCore from 'resolve/isCore';
 
-Object.freeze(isCore);
-
-export { async, sync, core, isCore };
+export { async, sync };

lib/core.js

@@ -15,24 +15,6 @@
 			},
 			"./index.js"
 		],
-		"./core": [
-			{
-				"default": "./lib/core.js"
-			},
-			"./lib/core.js"
-		],
-		"./core.json": [
-			{
-				"default": "./lib/core.json"
-			},
-			"./lib/core.json"
-		],
-		"./isCore": [
-			{
-				"default": "./lib/is-core.js"
-			},
-			"./lib/is-core.js"
-		],
 		"./sync": [
 			{
 				"default": "./lib/sync.js"
@@ -53,7 +35,7 @@
 		"module"
 	],
 	"scripts": {
-		"prepublish": "safe-publish-latest && cp node_modules/is-core-module/core.json ./lib/",
+		"prepublish": "safe-publish-latest",
 		"lint": "eslint --ext=js,mjs .",
 		"pretests-only": "cd ./test/resolver/nested_symlinks && node mylib/sync && node mylib/async",
 		"tests-only": "tape test/*.js",

lib/core.json

@@ -224,10 +224,6 @@ default `opts` values:
 }
 ```
 
-## resolve.isCore(pkg)
-
-Return whether a package is in core.
-
 # install
 
 With [npm](https://npmjs.org) do: