Add type: 'module'

Author: wooorm

index.js

@@ -0,0 +1,2 @@
+export {rss} from './lib/rss.js'
+export {atom} from './lib/atom.js'

index.mjs

@@ -1,7 +1,7 @@
-import u from 'unist-builder'
-import x from 'xastscript'
+import {u} from 'unist-builder'
+import {x} from 'xastscript'
 import bcp47 from 'bcp-47-normalize'
-import {toAuthor} from './util.mjs'
+import {toAuthor} from './util.js'
 
 export function atom(channel, data) {
   var now = new Date()
@@ -20,7 +20,7 @@ export function atom(channel, data) {
 
   items.push(
     x('title', String(meta.title)),
-    x('subtitle', String(meta.description || '')),
+    x('subtitle', String(meta.description || '') || null),
     // `rel: 'alternate'` is the default.
     x('link', value),
     x('id', value),

lib/atom.mjs renamed to lib/atom.js

@@ -1,7 +1,7 @@
-import u from 'unist-builder'
-import x from 'xastscript'
+import {u} from 'unist-builder'
+import {x} from 'xastscript'
 import bcp47 from 'bcp-47-normalize'
-import {toAuthor} from './util.mjs'
+import {toAuthor} from './util.js'
 
 export function rss(channel, data) {
   var now = new Date()
@@ -19,7 +19,7 @@ export function rss(channel, data) {
 
   items.push(
     x('title', String(meta.title)),
-    x('description', String(meta.description || '')),
+    x('description', String(meta.description || '') || null),
     x('link', new URL(meta.url).href),
     x('lastBuildDate', now.toGMTString()),
     x('dc:date', now.toISOString())

lib/rss.mjs renamed to lib/rss.js

@@ -25,17 +25,17 @@
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
+  "sideEffects": false,
   "type": "module",
-  "main": "./index.mjs",
-  "module": "./index.mjs",
+  "main": "index.js",
   "files": [
     "lib/",
-    "index.mjs"
+    "index.js"
   ],
   "dependencies": {
     "bcp-47-normalize": "^1.0.0",
-    "unist-builder": "^2.0.0",
-    "xastscript": "^2.0.0"
+    "unist-builder": "^3.0.0",
+    "xastscript": "^3.0.0"
   },
   "devDependencies": {
     "c8": "^7.0.0",
@@ -45,13 +45,13 @@
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "xast-util-to-xml": "^2.0.0",
-    "xo": "^0.38.0"
+    "xast-util-to-xml": "^3.0.0",
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "node test.mjs",
-    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node --experimental-modules test.mjs",
+    "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": {
@@ -64,10 +64,6 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
-    "extensions": [
-      "mjs"
-    ],
     "rules": {
       "complexity": "off",
       "eqeqeq": [
@@ -77,7 +73,9 @@
           "null": "ignore"
         }
       ],
-      "no-eq-null": "off"
+      "no-eq-null": "off",
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
     }
   },
   "remarkConfig": {

lib/util.mjs renamed to lib/util.js

@@ -25,11 +25,11 @@ blog posts, notes, and images).
 
 Just using either RSS or Atom is probably fine: no need to do both.
 
-Note that this package is ESM only: Node 12+ is required to use it and it must
-be imported instead of required.
-
 ## 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
@@ -38,7 +38,7 @@ npm install xast-util-feed
 
 ## Use
 
-Say we have the following module, `example.mjs`
+Say we have the following module, `example.js`
 
 ```js
 import {atom, rss} from 'xast-util-feed'
@@ -68,7 +68,7 @@ console.log(toXml(rss(channel, data)))
 console.log(toXml(atom(channel, data)))
 ```
 
-Now, running `node example.mjs` yields (pretty printed):
+Now, running `node example.js` yields (pretty printed):
 
 ```xml
 <?xml version="1.0" encoding="utf-8"?>
@@ -131,6 +131,9 @@ Now, running `node example.mjs` yields (pretty printed):
 
 ## API
 
+This package exports the following identifiers: `atom`, `rss`.
+There is no default export.
+
 ### `rss(channel, data)`
 
 Build an RSS feed.

package.json

@@ -1,7 +1,5 @@
-'use strict'
-
 import test from 'tape'
-import {atom, rss} from './index.mjs'
+import {atom, rss} from './index.js'
 
 // Hack so the tests don’t need updating everytime…
 var ODate = global.Date