[Breaking] add ESM wrapper to "exports"; change paths to match

Author: ljharb

index.mjs

@@ -0,0 +1,8 @@
+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 };

package.json

@@ -10,35 +10,37 @@
 	"exports": {
 		".": [
 			{
+				"import": "./index.mjs",
+				"require": "./index.js",
 				"default": "./index.js"
 			},
 			"./index.js"
 		],
-		"./lib/core": [
+		"./core": [
 			{
 				"default": "./lib/core.js"
 			},
 			"./lib/core.js"
 		],
-		"./lib/core.json": [
+		"./core.json": [
 			{
 				"default": "./lib/core.json"
 			},
 			"./lib/core.json"
 		],
-		"./lib/is-core": [
+		"./isCore": [
 			{
 				"default": "./lib/is-core.js"
 			},
 			"./lib/is-core.js"
 		],
-		"./lib/sync": [
+		"./sync": [
 			{
 				"default": "./lib/sync.js"
 			},
 			"./lib/sync.js"
 		],
-		"./lib/async": [
+		"./async": [
 			{
 				"default": "./lib/async.js"
 			},