Change to use export map

package.json

@@ -27,8 +27,7 @@
   ],
   "sideEffects": false,
   "type": "module",
-  "main": "index.js",
-  "types": "index.d.ts",
+  "exports": "./index.js",
   "files": [
     "lib/",
     "index.d.ts",
@@ -40,6 +39,7 @@
   "devDependencies": {
     "@types/node": "^20.0.0",
     "c8": "^7.0.0",
+    "is-buffer": "^2.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^11.0.0",
     "remark-preset-wooorm": "^9.0.0",

test.js

@@ -3,18 +3,18 @@ import {Buffer} from 'node:buffer'
 import fs from 'node:fs'
 import path from 'node:path'
 import process from 'node:process'
-import {fileURLToPath, URL} from 'node:url'
+import {fileURLToPath} from 'node:url'
 import test from 'node:test'
 import buffer from 'is-buffer'
-import {toVFile, read, readSync, write, writeSync} from './index.js'
+import {toVFile, read, readSync, write, writeSync} from 'to-vfile'
 
 const join = path.join
 
 const fixture = fs.readFileSync('readme.md', 'utf8')
 
 test('toVFile', async function (t) {
   assert.deepEqual(
-    Object.keys(await import('./index.js')).sort(),
+    Object.keys(await import('to-vfile')).sort(),
     ['read', 'readSync', 'toVFile', 'write', 'writeSync'],
     'should expose the public api'
   )