better publishing built files.

refactor of cb api

.eslintrc.json

@@ -1,5 +1,9 @@
 {
   "root": true,
+
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+
   "parserOptions": {
     "ecmaVersion": 9,
     "ecmaFeatures": {
@@ -14,9 +18,7 @@
     "node": true
   },
 
-  "plugins": [
-    "babel"
-  ],
+  "plugins": ["babel"],
 
   "globals": {
     "document": false,
@@ -117,14 +119,25 @@
     "no-unexpected-multiline": 2,
     "no-unneeded-ternary": [2, {"defaultAssignment": false}],
     "no-unreachable": 2,
-    "no-unused-vars": [2, { "vars": "local", "args": "none", "varsIgnorePattern": "^_"}],
+    "no-unused-vars": [
+      2,
+      {"vars": "local", "args": "none", "varsIgnorePattern": "^_"}
+    ],
     "no-useless-call": 2,
     "no-useless-constructor": 2,
     "no-with": 2,
     "one-var": [0, {"initialized": "never"}],
-    "operator-linebreak": [2, "after", { "overrides": { "?": "before", ":": "before" } }],
+    "operator-linebreak": [
+      2,
+      "after",
+      {"overrides": {"?": "before", ":": "before"}}
+    ],
     "padded-blocks": [2, "never"],
-    "quotes": [2, "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
+    "quotes": [
+      2,
+      "single",
+      {"avoidEscape": true, "allowTemplateLiterals": true}
+    ],
     "semi": [2, "never"],
     "semi-spacing": [2, {"before": false, "after": true}],
     "space-before-blocks": [2, "always"],

.github/workflows/npm-publish.yml

@@ -0,0 +1,19 @@
+name: publish npm package
+
+on:
+  push:
+    tags: [v*]
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - run: yarn --ignore-engines
+      - run: node build.js
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+name: test every commit
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - run: yarn --ignore-engines
+      - run: node build.js
+      - run: yarn test

.gitignore

@@ -2,3 +2,6 @@ node_modules
 dist
 yarn.lock
 package-lock.json
+.envrc
+lib
+test.html

README.md

@@ -4,69 +4,161 @@ Tools for developing [Nostr](https://github.com/fiatjaf/nostr) clients.
 
 ## Usage
 
+### Generating a private key and a public key
+
 ```js
-import {relayPool} from 'nostr-tools'
+import { generatePrivateKey, getPublicKey } from 'nostr-tools'
 
-const pool = relayPool()
-
-pool.setPrivateKey('<hex>') // optional
-
-pool.addRelay('ws://some.relay.com', {read: true, write: true})
-pool.addRelay('ws://other.relay.cool', {read: true, write: true})
-
-// example callback function for a subscription
-function onEvent(event, relay) => {
-  console.log(`got an event from ${relay.url} which is already validated.`, event)
-}
-
-// subscribing to a single user
-// author is the user's public key
-pool.sub({cb: onEvent, filter: {author: '<hex>'}})
-
-//  or bulk follow
-pool.sub({cb:(event, relay) => {...}, filter: {authors: ['<hex1>', '<hex2>', ..., '<hexn>']}})
-
-// reuse a subscription channel
-const mySubscription = pool.sub({cb: ..., filter: ....})
-mySubscription.sub({filter: ....})
-mySubscription.sub({cb: ...})
-mySubscription.unsub()
-
-// get specific event
-const specificChannel = pool.sub({
-  cb: (event, relay) => {
-    console.log('got specific event from relay', event, relay)
-    specificChannel.unsub()
-  },
-  filter: {id: '<hex>'}
-})
-
-// or get a specific event plus all the events that reference it in the 'e' tag
-pool.sub({ cb: (event, relay) => { ... }, filter: [{id: '<hex>'}, {'#e': '<hex>'}] })
-
-// get all events
-pool.sub({cb: (event, relay) => {...}, filter: {}})
-
-// get recent events
-pool.sub({cb: (event, relay) => {...}, filter: {since: timestamp}})
-
-// publishing events(inside an async function):
-const ev = await pool.publish(eventObject, (status, url) => {
-  if (status === 0) {
-    console.log(`publish request sent to ${url}`)
-  }
-  if (status === 1) {
-    console.log(`event published by ${url}`, ev)
-  }
-})
-// it will be signed automatically with the key supplied above
-// or pass an already signed event to bypass this
-
-// subscribing to a new relay
-pool.addRelay('<url>')
-// will automatically subscribe to the all the events called with .sub above
+let sk = generatePrivateKey() # `sk` is a hex string
+let pk = getPublicKey(sk) # `pk` is a hex string
 ```
 
-All functions expect bytearrays as hex strings and output bytearrays as hex strings.
+### Creating, signing and verifying events
 
-For other utils please read the source (for now).
+```js
+import {
+  validateEvent,
+  verifySignature,
+  signEvent,
+  getEventHash,
+  getPublicKey
+} from 'nostr-tools'
+
+let event = {
+  kind: 1,
+  created_at: Math.floor(Date.now() / 1000),
+  tags: [],
+  content: 'hello'
+}
+
+event.id = getEventHash(event.id)
+event.pubkey = getPublicKey(privateKey)
+event.sig = await signEvent(event, privateKey)
+
+let ok = validateEvent(event)
+let veryOk = await verifySignature(event)
+```
+
+### Interacting with a relay
+
+```js
+import {
+  relayInit,
+  generatePrivateKey,
+  getPublicKey,
+  getEventHash,
+  signEvent
+} from 'nostr-tools'
+
+const relay = relayInit('wss://relay.example.com')
+relay.connect()
+
+relay.on('connect', () => {
+  console.log(`connected to ${relay.url}`)
+})
+relay.on('error', () => {
+  console.log(`failed to connect to ${relay.url}`)
+})
+
+// let's query for an event that exists
+let sub = relay.sub([
+  {
+    ids: ['d7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027']
+  }
+])
+sub.on('event', event => {
+  console.log('we got the event we wanted:', event)
+})
+sub.on('eose', () => {
+  sub.unsub()
+})
+
+// let's publish a new event while simultaneously monitoring the relay for it
+let sk = generatePrivateKey()
+let pk = getPublicKey(sk)
+
+let sub = relay.sub([
+  {
+    kinds: [1],
+    authors: [pk]
+  }
+])
+
+sub.on('event', event => {
+  console.log('got event:', event)
+})
+
+let event = {
+  kind: 1,
+  pubkey: pk,
+  created_at: Math.floor(Date.now() / 1000),
+  tags: [],
+  content: 'hello world'
+}
+event.id = getEventHash(event)
+event.sig = await signEvent(event, sk)
+
+let pub = relay.publish(event)
+pub.on('ok', () => {
+  console.log(`{relay.url} has accepted our event`)
+})
+pub.on('seen', () => {
+  console.log(`we saw the event on {relay.url}`)
+})
+pub.on('failed', reason => {
+  console.log(`failed to publish to {relay.url}: ${reason}`)
+})
+
+await relay.close()
+```
+
+### Encrypting and decrypting direct messages
+
+```js
+import {nip04, getPublicKey, generatePrivateKey} from 'nostr-tools'
+
+// sender
+let sk1 = generatePrivateKey()
+let pk1 = getPublicKey(sk1)
+
+// receiver
+let sk2 = generatePrivateKey()
+let pk2 = getPublicKey(sk2)
+
+// on the sender side
+let message = 'hello'
+let ciphertext = nip04.encrypt(sk1, pk2, 'hello')
+
+let event = {
+  kind: 4,
+  pubkey: pk1,
+  tags: [['p', pk2]],
+  content: ciphertext,
+  ...otherProperties
+}
+
+sendEvent(event)
+
+// on the receiver side
+
+sub.on('event', (event) => {
+  let sender = event.tags.find(([k, v]) => k === 'p' && && v && v !== '')[1]
+  pk1 === sender
+  let plaintext = nip04.decrypt(sk2, pk1, event.content)
+})
+```
+
+Please consult the tests or [the source code](https://github.com/fiatjaf/nostr-tools) for more information that isn't available here.
+
+### Using from the browser (if you don't want to use a bundler)
+
+```html
+<script src="https://unpkg.com/nostr-tools/nostr.bundle.js"></script>
+<script>
+  window.NostrTools.generatePrivateKey('...') // and so on
+</script>
+```
+
+## License
+
+Public domain.

build.js

@@ -0,0 +1,47 @@
+#!/usr/bin/env node
+
+const esbuild = require('esbuild')
+const alias = require('esbuild-plugin-alias')
+
+let common = {
+  entryPoints: ['index.ts'],
+  bundle: true,
+  plugins: [
+    alias({
+      stream: require.resolve('readable-stream')
+    })
+  ],
+  sourcemap: 'external'
+}
+
+esbuild
+  .build({
+    ...common,
+    outfile: 'lib/nostr.esm.js',
+    format: 'esm',
+    packages: 'external'
+  })
+  .then(() => console.log('esm build success.'))
+
+esbuild
+  .build({
+    ...common,
+    outfile: 'lib/nostr.cjs.js',
+    format: 'cjs',
+    packages: 'external'
+  })
+  .then(() => console.log('cjs build success.'))
+
+esbuild
+  .build({
+    ...common,
+    outfile: 'lib/nostr.bundle.js',
+    format: 'iife',
+    globalName: 'NostrTools',
+    define: {
+      window: 'self',
+      global: 'self',
+      process: '{"env": {}}'
+    }
+  })
+  .then(() => console.log('standalone build success.'))

event.js

@@ -1,40 +0,0 @@
-import {Buffer} from 'buffer'
-import createHash from 'create-hash'
-import * as secp256k1 from '@noble/secp256k1'
-
-export function getBlankEvent() {
-  return {
-    kind: 255,
-    pubkey: null,
-    content: '',
-    tags: [],
-    created_at: 0
-  }
-}
-
-export function serializeEvent(evt) {
-  return JSON.stringify([
-    0,
-    evt.pubkey,
-    evt.created_at,
-    evt.kind,
-    evt.tags || [],
-    evt.content
-  ])
-}
-
-export function getEventHash(event) {
-  let eventHash = createHash('sha256')
-    .update(Buffer.from(serializeEvent(event)))
-    .digest()
-  return Buffer.from(eventHash).toString('hex')
-}
-
-export function verifySignature(event) {
-  if (event.id !== getEventHash(event)) return false
-  return secp256k1.schnorr.verify(event.sig, event.id, event.pubkey)
-}
-
-export async function signEvent(event, key) {
-  return secp256k1.schnorr.sign(getEventHash(event), key)
-}

event.test.js

@@ -0,0 +1,49 @@
+/* eslint-env jest */
+
+const {
+  validateEvent,
+  verifySignature,
+  signEvent,
+  getEventHash,
+  getPublicKey
+} = require('./lib/nostr.cjs')
+
+const event = {
+  id: 'd7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027',
+  kind: 1,
+  pubkey: '22a12a128a3be27cd7fb250cbe796e692896398dc1440ae3fa567812c8107c1c',
+  created_at: 1670869179,
+  content:
+    'NOSTR "WINE-ACCOUNT" WITH HARVEST DATE STAMPED\n\n\n"The older the wine, the greater its reputation"\n\n\n22a12a128a3be27cd7fb250cbe796e692896398dc1440ae3fa567812c8107c1c\n\n\nNWA 2022-12-12\nAA',
+  tags: [['client', 'astral']],
+  sig: 'f110e4fdf67835fb07abc72469933c40bdc7334615610cade9554bf00945a1cebf84f8d079ec325d26fefd76fe51cb589bdbe208ac9cdbd63351ddad24a57559'
+}
+
+const unsigned = {
+  created_at: 1671217411,
+  kind: 0,
+  tags: [],
+  content:
+    '{"name":"fiatjaf","about":"buy my merch at fiatjaf store","picture":"https://fiatjaf.com/static/favicon.jpg","nip05":"_@fiatjaf.com"}'
+}
+
+const privateKey =
+  '5c6c25b7ef18d8633e97512159954e1aa22809c6b763e94b9f91071836d00217'
+
+test('validate event', () => {
+  expect(validateEvent(event)).toBeTruthy()
+})
+
+test('check signature', async () => {
+  expect(await verifySignature(event)).toBeTruthy()
+})
+
+test('sign event', async () => {
+  let sig = await signEvent(unsigned, privateKey)
+  let hash = getEventHash(unsigned)
+  let pubkey = getPublicKey(privateKey)
+
+  let signed = {...unsigned, id: hash, sig, pubkey}
+
+  expect(await verifySignature(signed)).toBeTruthy()
+})

event.ts

@@ -0,0 +1,69 @@
+import {Buffer} from 'buffer'
+// @ts-ignore
+import * as secp256k1 from '@noble/secp256k1'
+import {sha256} from '@noble/hashes/sha256'
+
+export type Event = {
+  id?: string
+  sig?: string
+  kind: number
+  tags: string[][]
+  pubkey: string
+  content: string
+  created_at: number
+}
+
+export function getBlankEvent(): Event {
+  return {
+    kind: 255,
+    pubkey: '',
+    content: '',
+    tags: [],
+    created_at: 0
+  }
+}
+
+export function serializeEvent(evt: Event): string {
+  return JSON.stringify([
+    0,
+    evt.pubkey,
+    evt.created_at,
+    evt.kind,
+    evt.tags,
+    evt.content
+  ])
+}
+
+export function getEventHash(event: Event): string {
+  let eventHash = sha256(Buffer.from(serializeEvent(event)))
+  return Buffer.from(eventHash).toString('hex')
+}
+
+export function validateEvent(event: Event): boolean {
+  if (event.id !== getEventHash(event)) return false
+  if (typeof event.content !== 'string') return false
+  if (typeof event.created_at !== 'number') return false
+
+  if (!Array.isArray(event.tags)) return false
+  for (let i = 0; i < event.tags.length; i++) {
+    let tag = event.tags[i]
+    if (!Array.isArray(tag)) return false
+    for (let j = 0; j < tag.length; j++) {
+      if (typeof tag[j] === 'object') return false
+    }
+  }
+
+  return true
+}
+
+export function verifySignature(
+  event: Event & {id: string; sig: string}
+): Promise<boolean> {
+  return secp256k1.schnorr.verify(event.sig, event.id, event.pubkey)
+}
+
+export async function signEvent(event: Event, key: string): Promise<string> {
+  return Buffer.from(
+    await secp256k1.schnorr.sign(event.id || getEventHash(event), key)
+  ).toString('hex')
+}

filter.js

@@ -1,27 +0,0 @@
-export function matchFilter(filter, event) {
-  if (filter.id && event.id !== filter.id) return false
-  if (filter.kind && event.kind !== filter.kind) return false
-  if (filter.author && event.pubkey !== filter.author) return false
-  if (filter.authors && filter.authors.indexOf(event.pubkey) === -1)
-    return false
-  if (
-    filter['#e'] &&
-    !event.tags.find(([t, v]) => t === 'e' && v === filter['#e'])
-  )
-    return false
-  if (
-    filter['#p'] &&
-    !event.tags.find(([t, v]) => t === 'p' && v === filter['#p'])
-  )
-    return false
-  if (filter.since && event.created_at <= filter.since) return false
-
-  return true
-}
-
-export function matchFilters(filters, event) {
-  for (let i = 0; i < filters.length; i++) {
-    if (matchFilter(filters[i], event)) return true
-  }
-  return false
-}

filter.test.js

@@ -0,0 +1,42 @@
+/* eslint-env jest */
+
+const {matchFilters} = require('./lib/nostr.cjs')
+
+test('test if filters match', () => {
+  ;[
+    {
+      filters: [{ids: ['i']}],
+      good: [{id: 'i'}],
+      bad: [{id: 'j'}]
+    },
+    {
+      filters: [{authors: ['abc']}, {kinds: [1, 3]}],
+      good: [
+        {pubkey: 'xyz', kind: 3},
+        {pubkey: 'abc', kind: 12},
+        {pubkey: 'abc', kind: 1}
+      ],
+      bad: [{pubkey: 'hhh', kind: 12}]
+    },
+    {
+      filters: [{'#e': ['yyy'], since: 444}],
+      good: [
+        {
+          tags: [
+            ['e', 'uuu'],
+            ['e', 'yyy']
+          ],
+          created_at: 555
+        }
+      ],
+      bad: [{tags: [['e', 'uuu']], created_at: 111}]
+    }
+  ].forEach(({filters, good, bad}) => {
+    good.forEach(ev => {
+      expect(matchFilters(filters, ev)).toBeTruthy()
+    })
+    bad.forEach(ev => {
+      expect(matchFilters(filters, ev)).toBeFalsy()
+    })
+  })
+})

filter.ts

@@ -0,0 +1,49 @@
+import {Event} from './event'
+
+export type Filter = {
+  ids?: string[]
+  kinds?: number[]
+  authors?: string[]
+  since?: number
+  until?: number
+  [key: `#${string}`]: string[]
+}
+
+export function matchFilter(
+  filter: Filter,
+  event: Event & {id: string}
+): boolean {
+  if (filter.ids && filter.ids.indexOf(event.id) === -1) return false
+  if (filter.kinds && filter.kinds.indexOf(event.kind) === -1) return false
+  if (filter.authors && filter.authors.indexOf(event.pubkey) === -1)
+    return false
+
+  for (let f in filter) {
+    if (f[0] === '#') {
+      let tagName = f.slice(1)
+      let values = filter[`#${tagName}`]
+      if (
+        values &&
+        !event.tags.find(
+          ([t, v]) => t === f.slice(1) && values.indexOf(v) !== -1
+        )
+      )
+        return false
+    }
+  }
+
+  if (filter.since && event.created_at < filter.since) return false
+  if (filter.until && event.created_at >= filter.until) return false
+
+  return true
+}
+
+export function matchFilters(
+  filters: Filter[],
+  event: Event & {id: string}
+): boolean {
+  for (let i = 0; i < filters.length; i++) {
+    if (matchFilter(filters[i], event)) return true
+  }
+  return false
+}

index.js

@@ -1,25 +0,0 @@
-import {generatePrivateKey, getPublicKey} from './keys'
-import {relayConnect} from './relay'
-import {relayPool} from './pool'
-import {
-  getBlankEvent,
-  signEvent,
-  verifySignature,
-  serializeEvent,
-  getEventHash
-} from './event'
-import {matchFilter, matchFilters} from './filter'
-
-export {
-  generatePrivateKey,
-  relayConnect,
-  relayPool,
-  signEvent,
-  verifySignature,
-  serializeEvent,
-  getEventHash,
-  getPublicKey,
-  getBlankEvent,
-  matchFilter,
-  matchFilters
-}

index.ts

@@ -0,0 +1,8 @@
+export * from './keys'
+export * from './relay'
+export * from './event'
+export * from './filter'
+
+export * as nip04 from './nip04'
+export * as nip05 from './nip05'
+export * as nip06 from './nip06'

keys.js

@@ -1,9 +0,0 @@
-import * as secp256k1 from '@noble/secp256k1'
-
-export function generatePrivateKey() {
-  return Buffer.from(secp256k1.utils.randomPrivateKey()).toString('hex')
-}
-
-export function getPublicKey(privateKey) {
-  return secp256k1.getPublicKey(privateKey)
-}

keys.test.js

@@ -0,0 +1,20 @@
+/* eslint-env jest */
+
+const {generatePrivateKey, getPublicKey} = require('./lib/nostr.cjs')
+
+test('test private key generation', () => {
+  expect(generatePrivateKey()).toMatch(/[a-f0-9]{64}/)
+})
+
+test('test public key generation', () => {
+  expect(getPublicKey(generatePrivateKey())).toMatch(/[a-f0-9]{64}/)
+})
+
+test('test public key from private key deterministic', () => {
+  let sk = generatePrivateKey()
+  let pk = getPublicKey(sk)
+
+  for (let i = 0; i < 5; i++) {
+    expect(getPublicKey(sk)).toEqual(pk)
+  }
+})

keys.ts

@@ -0,0 +1,10 @@
+import * as secp256k1 from '@noble/secp256k1'
+import {Buffer} from 'buffer'
+
+export function generatePrivateKey(): string {
+  return Buffer.from(secp256k1.utils.randomPrivateKey()).toString('hex')
+}
+
+export function getPublicKey(privateKey: string): string {
+  return Buffer.from(secp256k1.schnorr.getPublicKey(privateKey)).toString('hex')
+}

nip04.js

@@ -1,39 +0,0 @@
-import aes from 'browserify-cipher'
-import {Buffer} from 'buffer'
-import randomBytes from 'randombytes'
-import * as secp256k1 from '@noble/secp256k1'
-
-export function encrypt(privkey, pubkey, text) {
-  const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
-  const normalizedKey = getOnlyXFromFullSharedSecret(key)
-
-  let iv = Uint8Array.from(randomBytes(16))
-  var cipher = aes.createCipheriv(
-    'aes-256-cbc',
-    Buffer.from(normalizedKey, 'hex'),
-    iv
-  )
-  let encryptedMessage = cipher.update(text, 'utf8', 'base64')
-  encryptedMessage += cipher.final('base64')
-
-  return [encryptedMessage, Buffer.from(iv.buffer).toString('base64')]
-}
-
-export function decrypt(privkey, pubkey, ciphertext, iv) {
-  const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
-  const normalizedKey = getOnlyXFromFullSharedSecret(key)
-
-  var decipher = aes.createDecipheriv(
-    'aes-256-cbc',
-    Buffer.from(normalizedKey, 'hex'),
-    Buffer.from(iv, 'base64')
-  )
-  let decryptedMessage = decipher.update(ciphertext, 'base64')
-  decryptedMessage += decipher.final('utf8')
-
-  return decryptedMessage
-}
-
-function getOnlyXFromFullSharedSecret(fullSharedSecretCoordinates) {
-  return fullSharedSecretCoordinates.substr(2, 64)
-}

nip04.test.js

@@ -0,0 +1,14 @@
+/* eslint-env jest */
+
+const {nip04, getPublicKey, generatePrivateKey} = require('./lib/nostr.cjs')
+
+test('encrypt and decrypt message', () => {
+  let sk1 = generatePrivateKey()
+  let sk2 = generatePrivateKey()
+  let pk1 = getPublicKey(sk1)
+  let pk2 = getPublicKey(sk2)
+
+  expect(nip04.decrypt(sk2, pk1, nip04.encrypt(sk1, pk2, 'hello'))).toEqual(
+    'hello'
+  )
+})

nip04.ts

@@ -0,0 +1,45 @@
+import {Buffer} from 'buffer'
+import {randomBytes} from '@noble/hashes/utils'
+import * as secp256k1 from '@noble/secp256k1'
+// @ts-ignore
+import aes from 'browserify-cipher'
+
+export function encrypt(privkey: string, pubkey: string, text: string): string {
+  const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
+  const normalizedKey = getNormalizedX(key)
+
+  let iv = Uint8Array.from(randomBytes(16))
+  var cipher = aes.createCipheriv(
+    'aes-256-cbc',
+    Buffer.from(normalizedKey, 'hex'),
+    iv
+  )
+  let encryptedMessage = cipher.update(text, 'utf8', 'base64')
+  encryptedMessage += cipher.final('base64')
+
+  return `${encryptedMessage}?iv=${Buffer.from(iv.buffer).toString('base64')}`
+}
+
+export function decrypt(
+  privkey: string,
+  pubkey: string,
+  ciphertext: string
+): string {
+  let [cip, iv] = ciphertext.split('?iv=')
+  let key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
+  let normalizedKey = getNormalizedX(key)
+
+  var decipher = aes.createDecipheriv(
+    'aes-256-cbc',
+    Buffer.from(normalizedKey, 'hex'),
+    Buffer.from(iv, 'base64')
+  )
+  let decryptedMessage = decipher.update(cip, 'base64', 'utf8')
+  decryptedMessage += decipher.final('utf8')
+
+  return decryptedMessage
+}
+
+function getNormalizedX(key: Uint8Array): string {
+  return Buffer.from(key.slice(1, 33)).toString('hex')
+}

nip05.js

@@ -1,52 +0,0 @@
-import {Buffer} from 'buffer'
-import dnsPacket from 'dns-packet'
-
-const dohProviders = [
-  'cloudflare-dns.com',
-  'fi.doh.dns.snopyta.org',
-  'basic.bravedns.com',
-  'hydra.plan9-ns1.com',
-  'doh.pl.ahadns.net',
-  'dns.flatuslifir.is',
-  'doh.dns.sb',
-  'doh.li'
-]
-
-let counter = 0
-
-export async function keyFromDomain(domain) {
-  let host = dohProviders[counter % dohProviders.length]
-
-  let buf = dnsPacket.encode({
-    type: 'query',
-    id: Math.floor(Math.random() * 65534),
-    flags: dnsPacket.RECURSION_DESIRED,
-    questions: [
-      {
-        type: 'TXT',
-        name: `_nostrkey.${domain}`
-      }
-    ]
-  })
-
-  let fetching = fetch(`https://${host}/dns-query`, {
-    method: 'POST',
-    headers: {
-      'Content-Type': 'application/dns-message',
-      'Content-Length': Buffer.byteLength(buf)
-    },
-    body: buf
-  })
-
-  counter++
-
-  try {
-    let response = Buffer.from(await (await fetching).arrayBuffer())
-    let {answers} = dnsPacket.decode(response)
-    if (answers.length === 0) return null
-    return Buffer.from(answers[0].data[0]).toString()
-  } catch (err) {
-    console.log(`error querying DNS for ${domain} on ${host}`, err)
-    return null
-  }
-}

nip05.ts

@@ -0,0 +1,31 @@
+var _fetch = fetch
+
+export function useFetchImplementation(fetchImplementation: any) {
+  _fetch = fetchImplementation
+}
+
+export async function searchDomain(
+  domain: string,
+  query = ''
+): Promise<{[name: string]: string}> {
+  try {
+    let res = await (
+      await _fetch(`https://${domain}/.well-known/nostr.json?name=${query}`)
+    ).json()
+
+    return res.names
+  } catch (_) {
+    return {}
+  }
+}
+
+export async function queryName(fullname: string): Promise<string> {
+  let [name, domain] = fullname.split('@')
+  if (!domain) throw new Error('invalid identifier, must contain an @')
+
+  let res = await (
+    await _fetch(`https://${domain}/.well-known/nostr.json?name=${name}`)
+  ).json()
+
+  return res.names && res.names[name]
+}

nip06.js

@@ -1,24 +0,0 @@
-import {wordlist} from 'micro-bip39/wordlists/english'
-import {
-  generateMnemonic,
-  mnemonicToSeedSync,
-  validateMnemonic
-} from 'micro-bip39'
-import {HDKey} from 'micro-bip32'
-
-export function privateKeyFromSeed(seed) {
-  let root = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))
-  return root.derive(`m/44'/1237'/0'/0'`).privateKey.toString('hex')
-}
-
-export function seedFromWords(mnemonic) {
-  return Buffer.from(mnemonicToSeedSync(mnemonic, wordlist)).toString('hex')
-}
-
-export function generateSeedWords() {
-  return generateMnemonic(wordlist)
-}
-
-export function validateWords(words) {
-  return validateMnemonic(words, wordlist)
-}

nip06.ts

@@ -0,0 +1,26 @@
+import {wordlist} from '@scure/bip39/wordlists/english.js'
+import {
+  generateMnemonic,
+  mnemonicToSeedSync,
+  validateMnemonic
+} from '@scure/bip39'
+import {HDKey} from '@scure/bip32'
+
+export function privateKeyFromSeed(seed: string): string {
+  let root = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))
+  let privateKey = root.derive(`m/44'/1237'/0'/0/0`).privateKey
+  if (!privateKey) throw new Error('could not derive private key')
+  return Buffer.from(privateKey).toString('hex')
+}
+
+export function seedFromWords(mnemonic: string): string {
+  return Buffer.from(mnemonicToSeedSync(mnemonic)).toString('hex')
+}
+
+export function generateSeedWords(): string {
+  return generateMnemonic(wordlist)
+}
+
+export function validateWords(words: string): boolean {
+  return validateMnemonic(words, wordlist)
+}

package.json

@@ -1,36 +1,47 @@
 {
   "name": "nostr-tools",
-  "version": "0.14.1",
+  "version": "1.0.0-alpha2",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",
     "url": "https://github.com/fiatjaf/nostr-tools.git"
   },
+  "main": "lib/nostr.cjs.js",
+  "module": "lib/nostr.esm.js",
   "dependencies": {
-    "@noble/secp256k1": "^1.3.0",
+    "@noble/hashes": "^0.5.7",
+    "@noble/secp256k1": "^1.7.0",
+    "@scure/bip32": "^1.1.1",
+    "@scure/bip39": "^1.1.0",
     "browserify-cipher": ">=1",
-    "buffer": ">=5",
-    "create-hash": "^1.2.0",
-    "dns-packet": "^5.2.4",
-    "micro-bip32": "^0.1.0",
-    "micro-bip39": "^0.1.3",
-    "randombytes": ">=2",
+    "buffer": "^6.0.3",
     "websocket-polyfill": "^0.0.3"
   },
   "keywords": [
     "decentralization",
-    "twitter",
-    "p2p",
-    "mastodon",
-    "ssb",
     "social",
-    "unstoppable",
-    "censorship",
     "censorship-resistance",
-    "client"
+    "client",
+    "nostr"
   ],
   "devDependencies": {
-    "eslint": "^8.5.0",
-    "eslint-plugin-babel": "^5.3.1"
+    "@types/node": "^18.0.3",
+    "@typescript-eslint/eslint-plugin": "^5.46.1",
+    "@typescript-eslint/parser": "^5.46.1",
+    "esbuild": "0.16.9",
+    "esbuild-plugin-alias": "^0.2.1",
+    "eslint": "^8.30.0",
+    "eslint-plugin-babel": "^5.3.1",
+    "esm-loader-typescript": "^1.0.1",
+    "events": "^3.3.0",
+    "jest": "^29.3.1",
+    "ts-jest": "^29.0.3",
+    "tsd": "^0.22.0",
+    "typescript": "^4.9.4"
+  },
+  "scripts": {
+    "build": "node build.js",
+    "pretest": "node build.js",
+    "test": "jest"
   }
 }

pool.js

@@ -1,166 +0,0 @@
-import {getEventHash, signEvent} from './event'
-import {relayConnect, normalizeRelayURL} from './relay'
-
-export function relayPool() {
-  var globalPrivateKey
-  const poolPolicy = {
-    // setting this to a number will cause events to be published to a random
-    // set of relays only, instead of publishing to all relays all the time
-    randomChoice: null
-  }
-  const relays = {}
-  const noticeCallbacks = []
-
-  function propagateNotice(notice, relayURL) {
-    for (let i = 0; i < noticeCallbacks.length; i++) {
-      let {relay} = relays[relayURL]
-      noticeCallbacks[i](notice, relay)
-    }
-  }
-
-  const activeSubscriptions = {}
-
-  const sub = ({cb, filter}, id = Math.random().toString().slice(2)) => {
-    const subControllers = Object.fromEntries(
-      Object.values(relays)
-        .filter(({policy}) => policy.read)
-        .map(({relay}) => [
-          relay.url,
-          relay.sub({filter, cb: event => cb(event, relay.url)}, id)
-        ])
-    )
-
-    const activeCallback = cb
-    const activeFilters = filter
-
-    const unsub = () => {
-      Object.values(subControllers).forEach(sub => sub.unsub())
-      delete activeSubscriptions[id]
-    }
-    const sub = ({cb = activeCallback, filter = activeFilters}) => {
-      Object.entries(subControllers).map(([relayURL, sub]) => [
-        relayURL,
-        sub.sub({cb, filter}, id)
-      ])
-      return activeSubscriptions[id]
-    }
-    const addRelay = relay => {
-      subControllers[relay.url] = relay.sub({cb, filter}, id)
-      return activeSubscriptions[id]
-    }
-    const removeRelay = relayURL => {
-      if (relayURL in subControllers) {
-        subControllers[relayURL].unsub()
-        if (Object.keys(subControllers).length === 0) unsub()
-      }
-      return activeSubscriptions[id]
-    }
-
-    activeSubscriptions[id] = {
-      sub,
-      unsub,
-      addRelay,
-      removeRelay
-    }
-
-    return activeSubscriptions[id]
-  }
-
-  return {
-    sub,
-    relays,
-    setPrivateKey(privateKey) {
-      globalPrivateKey = privateKey
-    },
-    setPolicy(key, value) {
-      poolPolicy[key] = value
-    },
-    addRelay(url, policy = {read: true, write: true}) {
-      let relayURL = normalizeRelayURL(url)
-      if (relayURL in relays) return
-
-      let relay = relayConnect(url, notice => {
-        propagateNotice(notice, relayURL)
-      })
-      relays[relayURL] = {relay, policy}
-
-      if (policy.read) {
-        Object.values(activeSubscriptions).forEach(subscription =>
-          subscription.addRelay(relay)
-        )
-      }
-
-      return relay
-    },
-    removeRelay(url) {
-      let relayURL = normalizeRelayURL(url)
-      let data = relays[relayURL]
-      if (!data) return
-
-      let {relay} = data
-      Object.values(activeSubscriptions).forEach(subscription =>
-        subscription.removeRelay(relay)
-      )
-      relay.close()
-      delete relays[relayURL]
-    },
-    onNotice(cb) {
-      noticeCallbacks.push(cb)
-    },
-    offNotice(cb) {
-      let index = noticeCallbacks.indexOf(cb)
-      if (index !== -1) noticeCallbacks.splice(index, 1)
-    },
-    async publish(event, statusCallback = (status, relayURL) => {}) {
-      event.id = getEventHash(event)
-
-      if (!event.sig) {
-        event.tags = event.tags || []
-
-        if (globalPrivateKey) {
-          event.sig = await signEvent(event, globalPrivateKey)
-        } else {
-          throw new Error(
-            "can't publish unsigned event. either sign this event beforehand or pass a private key while initializing this relay pool so it can be signed automatically."
-          )
-        }
-      }
-
-      let writeable = Object.values(relays)
-        .filter(({policy}) => policy.write)
-        .sort(() => Math.random() - 0.5) // random
-
-      let maxTargets = poolPolicy.randomChoice
-        ? poolPolicy.randomChoice
-        : writeable.length
-
-      let successes = 0
-
-      for (let i = 0; i < writeable.length; i++) {
-        let {relay} = writeable[i]
-
-        try {
-          await new Promise(async (resolve, reject) => {
-            try {
-              await relay.publish(event, status => {
-                statusCallback(status, relay.url)
-                resolve()
-              })
-            } catch (err) {
-              statusCallback(-1, relay.url)
-            }
-          })
-
-          successes++
-          if (successes >= maxTargets) {
-            break
-          }
-        } catch (err) {
-          /***/
-        }
-      }
-
-      return event
-    }
-  }
-}

relay.js

@@ -1,179 +0,0 @@
-/* global WebSocket */
-
-import 'websocket-polyfill'
-
-import {verifySignature} from './event'
-import {matchFilters} from './filter'
-
-export function normalizeRelayURL(url) {
-  let [host, ...qs] = url.trim().split('?')
-  if (host.slice(0, 4) === 'http') host = 'ws' + host.slice(4)
-  if (host.slice(0, 2) !== 'ws') host = 'wss://' + host
-  if (host.length && host[host.length - 1] === '/') host = host.slice(0, -1)
-  return [host, ...qs].join('?')
-}
-
-export function relayConnect(url, onNotice = () => {}, onError = () => {}) {
-  url = normalizeRelayURL(url)
-
-  var ws, resolveOpen, untilOpen, wasClosed
-  var openSubs = {}
-  let attemptNumber = 1
-  let nextAttemptSeconds = 1
-
-  function resetOpenState() {
-    untilOpen = new Promise(resolve => {
-      resolveOpen = resolve
-    })
-  }
-
-  var channels = {}
-
-  function connect() {
-    ws = new WebSocket(url)
-
-    ws.onopen = () => {
-      console.log('connected to', url)
-      resolveOpen()
-
-      // restablish old subscriptions
-      if (wasClosed) {
-        wasClosed = false
-        for (let channel in openSubs) {
-          let filters = openSubs[channel]
-          let cb = channels[channel]
-          sub({cb, filter: filters}, channel)
-        }
-      }
-    }
-    ws.onerror = err => {
-      console.log('error connecting to relay', url)
-      onError(err)
-    }
-    ws.onclose = () => {
-      resetOpenState()
-      attemptNumber++
-      nextAttemptSeconds += attemptNumber ** 3
-      if (nextAttemptSeconds > 14400) {
-        nextAttemptSeconds = 14400 // 4 hours
-      }
-      console.log(
-        `relay ${url} connection closed. reconnecting in ${nextAttemptSeconds} seconds.`
-      )
-      setTimeout(async () => {
-        try {
-          connect()
-        } catch (err) {}
-      }, nextAttemptSeconds * 1000)
-
-      wasClosed = true
-    }
-
-    ws.onmessage = async e => {
-      var data
-      try {
-        data = JSON.parse(e.data)
-      } catch (err) {
-        data = e.data
-      }
-
-      if (data.length > 1) {
-        if (data[0] === 'NOTICE') {
-          if (data.length < 2) return
-
-          console.log('message from relay ' + url + ': ' + data[1])
-          onNotice(data[1])
-          return
-        }
-
-        if (data[0] === 'EVENT') {
-          if (data.length < 3) return
-
-          let channel = data[1]
-          let event = data[2]
-
-          if (
-            (await verifySignature(event)) &&
-            channels[channel] &&
-            matchFilters(openSubs[channel], event)
-          ) {
-            channels[channel](event)
-          }
-          return
-        }
-      }
-    }
-  }
-
-  resetOpenState()
-
-  try {
-    connect()
-  } catch (err) {}
-
-  async function trySend(params) {
-    let msg = JSON.stringify(params)
-
-    await untilOpen
-    ws.send(msg)
-  }
-
-  const sub = ({cb, filter}, channel = Math.random().toString().slice(2)) => {
-    var filters = []
-    if (Array.isArray(filter)) {
-      filters = filter
-    } else {
-      filters.push(filter)
-    }
-
-    trySend(['REQ', channel, ...filters])
-    channels[channel] = cb
-    openSubs[channel] = filters
-
-    const activeCallback = cb
-    const activeFilters = filters
-
-    return {
-      sub: ({cb = activeCallback, filter = activeFilters}) =>
-        sub({cb, filter}, channel),
-      unsub: () => {
-        delete openSubs[channel]
-        delete channels[channel]
-        trySend(['CLOSE', channel])
-      }
-    }
-  }
-
-  return {
-    url,
-    sub,
-    async publish(event, statusCallback) {
-      try {
-        await trySend(['EVENT', event])
-        if (statusCallback) {
-          statusCallback(0)
-          let {unsub} = sub(
-            {
-              cb: () => {
-                statusCallback(1)
-                unsub()
-                clearTimeout(willUnsub)
-              },
-              filter: {id: event.id}
-            },
-            `monitor-${event.id.slice(0, 5)}`
-          )
-          let willUnsub = setTimeout(unsub, 5000)
-        }
-      } catch (err) {
-        if (statusCallback) statusCallback(-1)
-      }
-    },
-    close() {
-      ws.close()
-    },
-    get status() {
-      return ws.readyState
-    }
-  }
-}

relay.test.js

@@ -0,0 +1,117 @@
+/* eslint-env jest */
+
+const {
+  relayInit,
+  generatePrivateKey,
+  getPublicKey,
+  getEventHash,
+  signEvent
+} = require('./lib/nostr.cjs')
+
+describe('relay interaction', () => {
+  let relay = relayInit('wss://nostr-pub.semisol.dev/')
+
+  beforeAll(() => {
+    relay.connect()
+  })
+
+  afterAll(async () => {
+    await relay.close()
+  })
+
+  test('connectivity', () => {
+    return expect(
+      new Promise(resolve => {
+        relay.on('connect', () => {
+          resolve(true)
+        })
+        relay.on('error', () => {
+          resolve(false)
+        })
+      })
+    ).resolves.toBe(true)
+  })
+
+  test('querying', () => {
+    var resolve1
+    var resolve2
+
+    let sub = relay.sub([
+      {
+        ids: [
+          'd7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027'
+        ]
+      }
+    ])
+    sub.on('event', event => {
+      expect(event).toHaveProperty(
+        'id',
+        'd7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027'
+      )
+      resolve1(true)
+    })
+    sub.on('eose', () => {
+      resolve2(true)
+    })
+
+    return expect(
+      Promise.all([
+        new Promise(resolve => {
+          resolve1 = resolve
+        }),
+        new Promise(resolve => {
+          resolve2 = resolve
+        })
+      ])
+    ).resolves.toEqual([true, true])
+  })
+
+  test('listening (twice) and publishing', async () => {
+    let sk = generatePrivateKey()
+    let pk = getPublicKey(sk)
+    var resolve1
+    var resolve2
+
+    let sub = relay.sub([
+      {
+        kinds: [27572],
+        authors: [pk]
+      }
+    ])
+
+    sub.on('event', event => {
+      expect(event).toHaveProperty('pubkey', pk)
+      expect(event).toHaveProperty('kind', 27572)
+      expect(event).toHaveProperty('content', 'nostr-tools test suite')
+      resolve1(true)
+    })
+    sub.on('event', event => {
+      expect(event).toHaveProperty('pubkey', pk)
+      expect(event).toHaveProperty('kind', 27572)
+      expect(event).toHaveProperty('content', 'nostr-tools test suite')
+      resolve2(true)
+    })
+
+    let event = {
+      kind: 27572,
+      pubkey: pk,
+      created_at: Math.floor(Date.now() / 1000),
+      tags: [],
+      content: 'nostr-tools test suite'
+    }
+    event.id = getEventHash(event)
+    event.sig = await signEvent(event, sk)
+
+    relay.publish(event)
+    return expect(
+      Promise.all([
+        new Promise(resolve => {
+          resolve1 = resolve
+        }),
+        new Promise(resolve => {
+          resolve2 = resolve
+        })
+      ])
+    ).resolves.toEqual([true, true])
+  })
+})

relay.ts

@@ -0,0 +1,311 @@
+/* global WebSocket */
+
+import 'websocket-polyfill'
+
+import {Event, verifySignature, validateEvent} from './event'
+import {Filter, matchFilters} from './filter'
+
+export type Relay = {
+  url: string
+  status: number
+  connect: () => void
+  close: () => void
+  sub: (filters: Filter[], opts: SubscriptionOptions) => Sub
+  publish: (event: Event) => Pub
+  on: (type: 'connect' | 'disconnect' | 'notice', cb: any) => void
+  off: (type: 'connect' | 'disconnect' | 'notice', cb: any) => void
+}
+export type Pub = {
+  on: (type: 'ok' | 'seen' | 'failed', cb: any) => void
+  off: (type: 'ok' | 'seen' | 'failed', cb: any) => void
+}
+export type Sub = {
+  sub: (filters: Filter[], opts: SubscriptionOptions) => Sub
+  unsub: () => void
+  on: (type: 'event' | 'eose', cb: any) => void
+  off: (type: 'event' | 'eose', cb: any) => void
+}
+
+type SubscriptionOptions = {
+  skipVerification?: boolean
+  id?: string
+}
+
+export function relayInit(url: string): Relay {
+  var ws: WebSocket
+  var resolveOpen: () => void
+  var resolveClose: () => void
+  var untilOpen: Promise<void>
+  var wasClosed: boolean
+  var closed: boolean
+  var openSubs: {[id: string]: {filters: Filter[]} & SubscriptionOptions} = {}
+  var listeners: {
+    connect: Array<() => void>
+    disconnect: Array<() => void>
+    error: Array<() => void>
+    notice: Array<(msg: string) => void>
+  } = {
+    connect: [],
+    disconnect: [],
+    error: [],
+    notice: []
+  }
+  var subListeners: {
+    [subid: string]: {
+      event: Array<(event: Event) => void>
+      eose: Array<() => void>
+    }
+  } = {}
+  var pubListeners: {
+    [eventid: string]: {
+      ok: Array<() => void>
+      seen: Array<() => void>
+      failed: Array<(reason: string) => void>
+    }
+  } = {}
+  let attemptNumber = 1
+  let nextAttemptSeconds = 1
+  let isConnected = false
+
+  function resetOpenState() {
+    untilOpen = new Promise(resolve => {
+      resolveOpen = resolve
+    })
+  }
+
+  function connectRelay() {
+    ws = new WebSocket(url)
+
+    ws.onopen = () => {
+      listeners.connect.forEach(cb => cb())
+      resolveOpen()
+      isConnected = true
+
+      // restablish old subscriptions
+      if (wasClosed) {
+        wasClosed = false
+        for (let id in openSubs) {
+          let {filters} = openSubs[id]
+          sub(filters, openSubs[id])
+        }
+      }
+    }
+    ws.onerror = () => {
+      isConnected = false
+      listeners.error.forEach(cb => cb())
+    }
+    ws.onclose = async () => {
+      isConnected = false
+      listeners.disconnect.forEach(cb => cb())
+
+      if (closed) {
+        // we've closed this because we wanted, so end everything
+        resolveClose()
+        return
+      }
+
+      // otherwise keep trying to reconnect
+      resetOpenState()
+      attemptNumber++
+      nextAttemptSeconds += attemptNumber ** 3
+      if (nextAttemptSeconds > 14400) {
+        nextAttemptSeconds = 14400 // 4 hours
+      }
+      console.log(
+        `relay ${url} connection closed. reconnecting in ${nextAttemptSeconds} seconds.`
+      )
+      setTimeout(async () => {
+        try {
+          connectRelay()
+        } catch (err) {}
+      }, nextAttemptSeconds * 1000)
+
+      wasClosed = true
+    }
+
+    ws.onmessage = async e => {
+      var data
+      try {
+        data = JSON.parse(e.data)
+      } catch (err) {
+        data = e.data
+      }
+
+      if (data.length >= 1) {
+        switch (data[0]) {
+          case 'EVENT':
+            if (data.length !== 3) return // ignore empty or malformed EVENT
+
+            let id = data[1]
+            let event = data[2]
+            if (
+              validateEvent(event) &&
+              openSubs[id] &&
+              (openSubs[id].skipVerification || verifySignature(event)) &&
+              matchFilters(openSubs[id].filters, event)
+            ) {
+              openSubs[id]
+              subListeners[id]?.event.forEach(cb => cb(event))
+            }
+            return
+          case 'EOSE': {
+            if (data.length !== 2) return // ignore empty or malformed EOSE
+            let id = data[1]
+            subListeners[id]?.eose.forEach(cb => cb())
+            return
+          }
+          case 'OK': {
+            if (data.length < 3) return // ignore empty or malformed OK
+            let id: string = data[1]
+            let ok: boolean = data[2]
+            let reason: string = data[3] || ''
+            if (ok) pubListeners[id]?.ok.forEach(cb => cb())
+            else pubListeners[id]?.failed.forEach(cb => cb(reason))
+            return
+          }
+          case 'NOTICE':
+            if (data.length !== 2) return // ignore empty or malformed NOTICE
+            let notice = data[1]
+            listeners.notice.forEach(cb => cb(notice))
+            return
+        }
+      }
+    }
+  }
+
+  resetOpenState()
+
+  async function connect(): Promise<void> {
+    if (ws?.readyState && ws.readyState === 1) return // ws already open
+    try {
+      connectRelay()
+    } catch (err) {}
+  }
+
+  async function trySend(params: [string, ...any]) {
+    let msg = JSON.stringify(params)
+
+    await untilOpen
+    ws.send(msg)
+  }
+
+  const sub = (
+    filters: Filter[],
+    {
+      skipVerification = false,
+      id = Math.random().toString().slice(2)
+    }: SubscriptionOptions = {}
+  ): Sub => {
+    let subid = id
+
+    openSubs[subid] = {
+      id: subid,
+      filters,
+      skipVerification
+    }
+    trySend(['REQ', subid, ...filters])
+
+    return {
+      sub: (newFilters, newOpts = {}) =>
+        sub(newFilters || filters, {
+          skipVerification: newOpts.skipVerification || skipVerification,
+          id: subid
+        }),
+      unsub: () => {
+        delete openSubs[subid]
+        delete subListeners[subid]
+        trySend(['CLOSE', subid])
+      },
+      on: (type: 'event' | 'eose', cb: any): void => {
+        subListeners[subid] = subListeners[subid] || {
+          event: [],
+          eose: []
+        }
+        subListeners[subid][type].push(cb)
+      },
+      off: (type: 'event' | 'eose', cb: any): void => {
+        let idx = subListeners[subid][type].indexOf(cb)
+        if (idx >= 0) subListeners[subid][type].splice(idx, 1)
+      }
+    }
+  }
+
+  return {
+    url,
+    sub,
+    on: (type: 'connect' | 'disconnect' | 'notice', cb: any): void => {
+      listeners[type].push(cb)
+      if (type === 'connect' && isConnected) {
+        cb()
+      }
+    },
+    off: (type: 'connect' | 'disconnect' | 'notice', cb: any): void => {
+      let index = listeners[type].indexOf(cb)
+      if (index !== -1) listeners[type].splice(index, 1)
+    },
+    publish(event: Event): Pub {
+      if (!event.id) throw new Error(`event ${event} has no id`)
+      let id = event.id
+
+      var sent = false
+      var mustMonitor = false
+
+      trySend(['EVENT', event])
+        .then(() => {
+          sent = true
+          if (mustMonitor) {
+            startMonitoring()
+            mustMonitor = false
+          }
+        })
+        .catch(() => {})
+
+      const startMonitoring = () => {
+        let monitor = sub([{ids: [id]}], {
+          id: `monitor-${id.slice(0, 5)}`
+        })
+        let willUnsub = setTimeout(() => {
+          pubListeners[id].failed.forEach(cb =>
+            cb('event not seen after 5 seconds')
+          )
+          monitor.unsub()
+        }, 5000)
+        monitor.on('event', () => {
+          clearTimeout(willUnsub)
+          pubListeners[id].seen.forEach(cb => cb())
+        })
+      }
+
+      return {
+        on: (type: 'ok' | 'seen' | 'failed', cb: any) => {
+          pubListeners[id] = pubListeners[id] || {
+            ok: [],
+            seen: [],
+            failed: []
+          }
+          pubListeners[id][type].push(cb)
+
+          if (type === 'seen') {
+            if (sent) startMonitoring()
+            else mustMonitor = true
+          }
+        },
+        off: (type: 'ok' | 'seen' | 'failed', cb: any) => {
+          let idx = pubListeners[id][type].indexOf(cb)
+          if (idx >= 0) pubListeners[id][type].splice(idx, 1)
+        }
+      }
+    },
+    connect,
+    close(): Promise<void> {
+      closed = true // prevent ws from trying to reconnect
+      ws.close()
+      return new Promise(resolve => {
+        resolveClose = resolve
+      })
+    },
+    get status() {
+      return ws.readyState
+    }
+  }
+}

tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "module": "esnext",
+    "target": "esnext",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "declaration": true,
+    "strict": true,
+    "moduleResolution": "node",
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "emitDeclarationOnly": true,
+    "outDir": "dist",
+    "rootDir": "."
+  }
+}