Use ESM

.gitignore

@@ -1,8 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
-unist-util-visit.js
-unist-util-visit.min.js
 yarn.lock

.prettierignore

@@ -1,5 +1,2 @@
 coverage/
-unist-util-visit.js
-unist-util-visit.min.js
-*.json
 *.md

index.js

@@ -1,14 +1,8 @@
-'use strict'
+import {visitParents, CONTINUE, SKIP, EXIT} from 'unist-util-visit-parents'
 
-module.exports = visit
+export {CONTINUE, SKIP, EXIT}
 
-var visitParents = require('unist-util-visit-parents')
-
-visit.CONTINUE = visitParents.CONTINUE
-visit.SKIP = visitParents.SKIP
-visit.EXIT = visitParents.EXIT
-
-function visit(tree, test, visitor, reverse) {
+export function visit(tree, test, visitor, reverse) {
   if (typeof test === 'function' && typeof visitor !== 'function') {
     reverse = visitor
     visitor = test

package.json

@@ -38,46 +38,36 @@
     "Eugene Sharygin <eush77@gmail.com>",
     "Richard Gibson <richard.gibson@gmail.com>"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
+  "types": "types/index.d.ts",
   "files": [
-    "index.js",
-    "types/index.d.ts"
+    "types/index.d.ts",
+    "index.js"
   ],
-  "types": "types/index.d.ts",
   "dependencies": {
     "@types/unist": "^2.0.0",
-    "unist-util-is": "^4.0.0",
-    "unist-util-visit-parents": "^3.0.0"
+    "unist-util-is": "^5.0.0",
+    "unist-util-visit-parents": "^4.0.0"
   },
   "devDependencies": {
-    "browserify": "^17.0.0",
-    "dtslint": "^4.0.0",
-    "nyc": "^15.0.0",
+    "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark": "^13.0.0",
     "remark-cli": "^9.0.0",
     "remark-gfm": "^1.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "tinyify": "^3.0.0",
     "typescript": "^4.0.0",
     "unified": "^9.0.0",
     "xo": "^0.38.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "build-bundle": "browserify . -s unistUtilVisit -o unist-util-visit.js",
-    "build-mangle": "browserify . -s unistUtilVisit -o unist-util-visit.min.js -p tinyify",
-    "build": "npm run build-bundle && npm run build-mangle",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test.js",
-    "test-types": "dtslint types",
-    "test": "npm run format && npm run build && npm run test-coverage && npm run test-types"
-  },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
+    "test-api": "node test.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test.js",
+    "test": "npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -89,13 +79,12 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
-      "unicorn/prefer-set-has": "off"
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
     },
-    "ignores": [
-      "unist-util-visit.js",
-      "types"
+    "ignore": [
+      "types/"
     ]
   },
   "remarkConfig": {

readme.md

@@ -12,6 +12,9 @@
 
 ## Install
 
+This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c):
+Node 12+ is needed to use it and it must be `import`ed instead of `require`d.
+
 [npm][]:
 
 ```sh
@@ -46,6 +49,10 @@ Yields:
 
 ## API
 
+This package exports the following identifiers: `visit`, `CONTINUE`, `SKIP`, and
+`EXIT`.
+There is no default export.
+
 ### `visit(tree[, test], visitor[, reverse])`
 
 This function works exactly the same as [`unist-util-visit-parents`][vp],

test.js

@@ -1,16 +1,14 @@
-'use strict'
-
-var assert = require('assert')
-var test = require('tape')
-var remark = require('remark')
-var gfm = require('remark-gfm')
-var visit = require('.')
+import assert from 'assert'
+import test from 'tape'
+import remark from 'remark'
+import gfm from 'remark-gfm'
+import {visit, CONTINUE, EXIT, SKIP} from './index.js'
 
 var tree = remark().parse('Some _emphasis_, **importance**, and `code`.')
 
-var STOP = 5
-var SKIP = 7
-var SKIP_REVERSE = 6
+var stopIndex = 5
+var skipIndex = 7
+var skipReverseIndex = 6
 
 var texts = 6
 var codes = 1
@@ -146,7 +144,7 @@ test('unist-util-visit', function (t) {
   })
 
   t.test('should accept an array of `is`-compatible tests', function (st) {
-    var expected = ['root', 'paragraph', 'emphasis', 'strong']
+    var expected = new Set(['root', 'paragraph', 'emphasis', 'strong'])
     var tests = [test, 'paragraph', {value: '.'}, ['emphasis', 'strong']]
     var n = 0
 
@@ -157,7 +155,7 @@ test('unist-util-visit', function (t) {
     st.end()
 
     function visitor(node) {
-      var ok = expected.includes(node.type) || node.value === '.'
+      var ok = expected.has(node.type) || node.value === '.'
       assert.ok(ok, 'should be a requested type: ' + node.type)
       n++
     }
@@ -172,13 +170,13 @@ test('unist-util-visit', function (t) {
 
     visit(tree, visitor)
 
-    st.equal(n, STOP, 'should visit nodes until `visit.EXIT` is given')
+    st.equal(n, stopIndex, 'should visit nodes until `EXIT` is given')
 
     st.end()
 
     function visitor(node) {
       assert.strictEqual(node.type, types[n++], 'should be the expected type')
-      return n === STOP ? visit.EXIT : visit.CONTINUE
+      return n === stopIndex ? EXIT : CONTINUE
     }
   })
 
@@ -187,7 +185,7 @@ test('unist-util-visit', function (t) {
 
     visit(tree, visitor, true)
 
-    st.equal(n, STOP, 'should visit nodes until `visit.EXIT` is given')
+    st.equal(n, stopIndex, 'should visit nodes until `EXIT` is given')
 
     st.end()
 
@@ -197,7 +195,7 @@ test('unist-util-visit', function (t) {
         reverseTypes[n++],
         'should be the expected type'
       )
-      return n === STOP ? visit.EXIT : visit.CONTINUE
+      return n === stopIndex ? EXIT : CONTINUE
     }
   })
 
@@ -210,7 +208,7 @@ test('unist-util-visit', function (t) {
     st.equal(
       count,
       types.length - 1,
-      'should visit nodes except when `visit.SKIP` is given'
+      'should visit nodes except when `SKIP` is given'
     )
 
     st.end()
@@ -219,9 +217,9 @@ test('unist-util-visit', function (t) {
       assert.strictEqual(node.type, types[n++], 'should be the expected type')
       count++
 
-      if (n === SKIP) {
+      if (n === skipIndex) {
         n++ // The one node inside it.
-        return visit.SKIP
+        return SKIP
       }
     }
   })
@@ -235,7 +233,7 @@ test('unist-util-visit', function (t) {
     st.equal(
       count,
       reverseTypes.length - 1,
-      'should visit nodes except when `visit.SKIP` is given'
+      'should visit nodes except when `SKIP` is given'
     )
 
     st.end()
@@ -248,9 +246,9 @@ test('unist-util-visit', function (t) {
       )
       count++
 
-      if (n === SKIP_REVERSE) {
+      if (n === skipReverseIndex) {
         n++ // The one node inside it.
-        return visit.SKIP
+        return SKIP
       }
     }
   })