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Gozalalidelachingbrain
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feat: share IPFS node between browser tabs (#3081)
This pull request adds 3 (sub)packages: 1. `ipfs-message-port-client` - Provides an API to an IPFS node over the [message channel][MessageChannel]. 2. `ipfs-message-port-server` - Provides an IPFS node over [message channel][MessageChannel]. 3. `ipfs-message-port-protocol` - Shared code between client / server mostly related to wire protocol encoding / decoding. Fixes #3022 [MessageChannel]:https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel Co-authored-by: Marcin Rataj <lidel@lidel.org> Co-authored-by: Alex Potsides <alex@achingbrain.net>
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‎examples/browser-sharing-node-across-tabs/README.md

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# Sharing js-ipfs node across browsing contexts (tabs) using [SharedWorker][]
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> In this example, you will find a boilerplate you can use to set up a js-ipfs
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> node in the [SharedWorker] and use it from multiple tabs.
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## Before you start
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First clone this repo, install dependencies in the project root and build the project.
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```bash
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git clone https://github.com/ipfs/js-ipfs.git
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cd js-ipfs/examples/browser-sharing-node-across-tabs
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npm install
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```
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## Running the example
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Run the following command within this folder:
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```bash
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npm start
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```
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Now open your browser at `http://localhost:3000`
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You should see the following:
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![Screen Shot](./Screen Shot.png)
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### Run tests
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```bash
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npm test
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```
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[SharedWorker]:https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker

‎examples/browser-sharing-node-across-tabs/Screen Shot.png

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‎examples/browser-sharing-node-across-tabs/index.html

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<html>
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<head>
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<title>Sample App</title>
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</head>
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<body>
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<div id='root'></div>
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<script src="/static/bundle.js"></script>
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</body>
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</html>

‎examples/browser-sharing-node-across-tabs/package.json

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{
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"name": "expample-browser-sharing-node-across-tabs",
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"description": "Sharing IPFS node across browsing contexts",
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"version": "1.0.0",
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"private": true,
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"scripts": {
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"clean": "rm -rf ./dist",
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"build": "webpack",
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"start": "node server.js",
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"test": "test-ipfs-example"
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},
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"license": "MIT",
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"keywords": [],
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"devDependencies": {
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"@babel/core": "^7.2.2",
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"@babel/preset-env": "^7.3.1",
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"babel-loader": "^8.0.5",
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"copy-webpack-plugin": "^5.0.4",
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"test-ipfs-example": "^2.0.3",
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"webpack": "^4.43.0",
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"webpack-cli": "^3.3.11",
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"webpack-dev-server": "^3.11.0",
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"worker-plugin": "4.0.3"
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},
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"dependencies": {
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"ipfs": "^0.47.0",
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"ipfs-message-port-client": "^0.0.1",
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"ipfs-message-port-server": "^0.0.1"
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},
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"browserslist": [
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">1%",
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"not dead",
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"not ie <= 11",
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"not op_mini all"
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]
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}

‎examples/browser-sharing-node-across-tabs/server.js

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'use strict'
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const webpack = require('webpack')
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const WebpackDevServer = require('webpack-dev-server')
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const config = require('./webpack.config')
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const wds = new WebpackDevServer(webpack(config), {
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hot: true,
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historyApiFallback: true
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})
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wds.listen(3000, 'localhost', (err) => {
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if (err) {
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throw err
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}
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console.log('Listening at localhost:3000')
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})

‎examples/browser-sharing-node-across-tabs/src/main.js

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'use strict'
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import IPFSClient from "ipfs-message-port-client"
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const main = async () => {
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// connect / spawn shared ipfs worker & create a client.
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const worker = new SharedWorker('./worker.js', { type: 'module' })
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const ipfs = IPFSClient.from(worker.port)
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const path = location.hash.slice(1)
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if (path.startsWith('/ipfs/')) {
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await viewer(ipfs, path)
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} else {
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await uploader(ipfs)
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}
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}
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const uploader = async (ipfs) => {
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document.body.outerHTML += '<div>Adding "hello world!" to shared IPFS node</div>'
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const entry = await ipfs.add(ipfs, new Blob(['hello world!'], { type: "text/plain" }))
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const path = `/ipfs/${entry.cid}/`
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document.body.outerHTML += `<div class="ipfs-add">File was added:
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<a target="_blank" href="${new URL(`#${path}`, location)}">${path}</a>
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</div>`
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}
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const viewer = async (ipfs, path) => {
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document.body.outerHTML += `<div class="loading">Loading ${path}</div>`
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try {
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const chunks = []
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for await (const chunk of await ipfs.cat(path)) {
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chunks.push(chunk)
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}
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const blob = new Blob(chunks)
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const url = URL.createObjectURL(blob)
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document.body.outerHTML +=
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`<iframe id="content" sandbox src=${url} style="background:white;top:0;left:0;border:0;width:100%;height:100%;position:absolute;z-index:2;"></iframe>`
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} catch(error) {
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document.body.outerHTML += `<div class="error">${error}</div>`
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}
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}
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onload = main

‎examples/browser-sharing-node-across-tabs/src/worker.js

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'use strict'
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import IPFS from 'ipfs'
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import { Server, IPFSService } from 'ipfs-message-port-server'
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const main = async () => {
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// start listening to all the incoming connections (browsing contexts that
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// which run new SharedWorker...)
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// Note: It is important to start listening before we do any await to ensure
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// that connections aren't missed while awaiting.
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const connections = listen(self, 'connect')
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// Start an IPFS node & create server that will expose it's API to all clients
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// over message channel.
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const ipfs = await IPFS.create()
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const service = new IPFSService(ipfs)
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const server = new Server(service)
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// connect every queued and future connection to the server.
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for await (const event of connections) {
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const port = event.ports[0]
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if (port) {
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server.connect(port)
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}
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}
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}
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/**
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* Creates an AsyncIterable<Event> for all the events on the given `target` for
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* the given event `type`. It is like `target.addEventListener(type, listener, options)`
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* but instead of passing listener you get `AsyncIterable<Event>` instead.
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* @param {EventTarget} target
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* @param {string} type
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* @param {AddEventListenerOptions} options
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*/
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const listen = function (target, type, options) {
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const events = []
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let resume
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let ready = new Promise(resolve => (resume = resolve))
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const write = event => {
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events.push(event)
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resume()
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}
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const read = async () => {
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await ready
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ready = new Promise(resolve => (resume = resolve))
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return events.splice(0)
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}
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const reader = async function * () {
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try {
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while (true) {
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yield * await read()
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}
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} finally {
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target.removeEventListener(type, write, options)
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}
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}
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target.addEventListener(type, write, options)
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return reader()
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}
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main()

‎examples/browser-sharing-node-across-tabs/test.js

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'use strict'
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const pkg = require('./package.json')
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module.exports = {
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[pkg.name]: (browser) => {
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browser
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.url(process.env.IPFS_EXAMPLE_TEST_URL)
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.waitForElementVisible('.ipfs-add')
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browser.expect.element('.ipfs-add a').text.to.contain('/ipfs/')
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browser.click('.ipfs-add a')
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browser.windowHandle(({ value }) => {
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browser.windowHandles(({ value: handles }) => {
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const [handle] = handles.filter(handle => handle != value)
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browser.switchWindow(handle)
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})
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})
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browser.waitForElementVisible('.loading')
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browser.expect.element('.loading').text.to.contain('Loading /ipfs/')
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browser.waitForElementVisible('#content').pause(5000)
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browser.element('css selector', '#content', frame => {
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browser.frame({ ELEMENT: frame.value.ELEMENT }, () => {
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browser.waitForElementPresent('body')
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browser.expect.element('body').text.to.contain('hello world!')
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browser.end()
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})
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})
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}
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}

‎examples/browser-sharing-node-across-tabs/webpack.config.js

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'use strict'
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var path = require('path')
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var webpack = require('webpack')
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const WorkerPlugin = require('worker-plugin')
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module.exports = {
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devtool: 'source-map',
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entry: [
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'webpack-dev-server/client?http://localhost:3000',
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'webpack/hot/only-dev-server',
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'./src/main'
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],
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output: {
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path: path.join(__dirname, 'dist'),
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filename: 'static/bundle.js'
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},
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plugins: [
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new WorkerPlugin({
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sharedWorker: true,
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globalObject: 'self'
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}),
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new webpack.HotModuleReplacementPlugin()
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],
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module: {
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rules: [
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{
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test: /\.js$/,
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exclude: /node_modules/,
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use: {
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loader: 'babel-loader',
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options: {
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presets: ['@babel/preset-env']
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}
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}
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}
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]
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},
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node: {
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fs: 'empty',
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net: 'empty',
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tls: 'empty'
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}
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}

‎examples/traverse-ipld-graphs/package.json

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"dependencies": {
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"cids": "^0.8.3",
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"ipfs": "^0.48.0",
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"ipld-block": "^0.9.1",
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"ipld-block": "^0.9.2",
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"ipld-dag-pb": "^0.19.0",
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"multihashing-async": "^1.0.0"
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}

‎packages/interface-ipfs-core/package.json

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"ipfs-unixfs": "^1.0.3",
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"ipfs-unixfs-importer": "^2.0.2",
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"ipfs-utils": "^2.2.2",
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"ipld-block": "^0.9.1",
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"ipld-dag-cbor": "^0.15.2",
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"ipld-block": "^0.9.2",
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"ipld-dag-cbor": "^0.15.3",
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"ipld-dag-pb": "^0.19.0",
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"is-ipfs": "^1.0.3",
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"iso-random-stream": "^1.1.1",

‎packages/interface-ipfs-core/src/object/links.js

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const node1bCid = await ipfs.object.put(node1b)
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const links = await ipfs.object.links(node1bCid)
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expect(links).to.be.an('array').that.has.property('length', 1)
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expect(node1b.Links).to.be.deep.equal(links)
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expect(links).to.have.lengthOf(1)
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expect(node1b.Links).to.deep.equal(links)
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})
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it('should get links by base58 encoded multihash', async () => {

‎packages/ipfs-http-client/package.json

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"form-data": "^3.0.0",
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"ipfs-core-utils": "^0.3.0",
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"ipfs-utils": "^2.2.2",
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"ipld-block": "^0.9.1",
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"ipld-dag-cbor": "^0.15.2",
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"ipld-block": "^0.9.2",
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"ipld-dag-cbor": "^0.15.3",
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"ipld-dag-pb": "^0.19.0",
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"ipld-raw": "^5.0.0",
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"iso-url": "^0.4.7",
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"nanoid": "^3.0.2",
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"node-fetch": "^2.6.0",
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"parse-duration": "^0.4.4",
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"stream-to-it": "^0.2.0"
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"stream-to-it": "^0.2.1"
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},
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"devDependencies": {
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"aegir": "^23.0.0",

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