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<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<title>Using lit-apollo</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<meta name="description" content="Declarative Data that Uses the Platform" />
<meta name="theme-color" content="#7ED9D9">
<meta property="og:title" content="Using lit-apollo" />
<meta property="og:locale" content="en_US" />
<meta property="og:description" content="Declarative Data that Uses the Platform" />
<meta property="og:site_name" content="Using lit-apollo" />
<meta property="og:image" content="https://apolloelements.dev/using-lit-apollo/images/poster.png" />
<meta property="og:image:alt" content="Using lit-apollo" />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://apolloelements.dev/using-lit-apollo/" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@PowersBenny" />
<meta name="twitter:creator" content="@PowersBenny" />
<link rel="manifest" href="manifest.webmanifest">
<link rel="canonical" href="https://apolloelements.dev/using-lit-apollo/">
<link rel="preload" as="image" href="https://i.imgflip.com/41sc82.jpg"/>
<link rel="preload" as="image" href="https://media.giphy.com/media/Utu9EoKlfEyVF082Ks/giphy.gif"/>
<link rel="preload" as="image" href="https://media.giphy.com/media/JsJfghwzAP8St2JcfG/giphy.gif"/>
<link rel="preload" as="script" href="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"/>
<link rel="preload" as="script" href="https://unpkg.com/[email protected]/lib/marked.js"/>
<link rel="preload" as="script" href="https://unpkg.com/[email protected]/prism.js"/>
<link rel="preload" as="script" href="https://unpkg.com/[email protected]/components/prism-graphql.min.js"/>
<link rel="preload" as="script" href="https://unpkg.com/[email protected]/components/prism-typescript.min.js"/>
<link rel="preload" as="font" href="Recursive_VF_1.051.woff2" type="font/woff2"/>
<link rel="stylesheet" href="styles.css">
</head>
<noscript>
<style>
body {
padding-top: 80px;
}
h1 {
text-transform: uppercase;
}
h1, p {
text-align: center;
}
h1 span:first-child {
line-height: 0.6;
color: var(--tertiary);
font-size: 40vw;
}
h1 span:last-child {
line-height: 0.2;
color: var(--primary);
font-size: 20vw;
}
p {
font-size: 24px;
}
</style>
</noscript>
<body>
<noscript>
<h1>
<span> Lit </span>
<span><code>Apollo</code></span>
</h1>
<p>Data-Driven Components that Use the Platform</p>
<p>This presentation relies on JavaScript. Please consider enabling JavaScript for this site.</p>
</noscript>
<slidem-deck id="deck"
transition="slide-in slide-out"
itemscope
itemtype="http://schema.org/PresentationDigitalDocument"
loading>
<gluon-keybinding key="Backspace" slot="backward"></gluon-keybinding>
<gluon-keybinding key=" " slot="forward"></gluon-keybinding>
<gluon-keybinding key="h" slot="backward"></gluon-keybinding>
<gluon-keybinding key="j" slot="forward"></gluon-keybinding>
<gluon-keybinding key="k" slot="backward"></gluon-keybinding>
<gluon-keybinding key="l" slot="forward"></gluon-keybinding>
<slidem-slide name="intro"
slide-out
center>
<h1>
<span uppercase fit line-height="0.6" color="--tertiary"> Lit </span>
<span uppercase fit line-height="0.2" color="--primary"><code style="--slnt:-12">Apollo</code></span>
</h1>
<p center>Data-Driven Components that Use the Platform</p>
<p center font-size="24px">(Space, <kbd>H</kbd><kbd>J</kbd><kbd>K</kbd><kbd>L</kbd> or <kbd>→</kbd><kbd>←</kbd> Keys to Navigate)</p>
<p center font-size="24px">(<kbd>F</kbd> for Fullscreen)</p>
</slidem-slide>
<slidem-slide name="graphql">
<h2 fit uppercase color="--primary">GraphQL</h2>
<p>Query Language for APIs</p>
<p>Published by Facebook in 2015</p>
</slidem-slide>
<slidem-slide name="tradeoffs">
<h2>Tradeoffs ⚖️</h2>
<section reveal>
<h3>✅ Pros</h3>
<ul>
<li>Strongly Typed at Runtime</li>
<li>Highly Abstract and Expressive</li>
<li>Deeply Nested Data is Easy to Manage</li>
<li>Fields Defined by Functions Called Resolvers</li>
</ul>
</section>
<section reveal>
<h3>😕 Cons</h3>
<ul>
<li>Implementation Overhead</li>
<li>Unfamiliar Debugging Story</li>
<li>Performance Pitfalls</li>
<li>Rife with Gotcha's</li>
</ul>
</section>
</slidem-slide>
<slidem-slide name="queries-and-mutations">
<h2>Queries and Mutations</h2>
<p>Unlike REST APIs, GraphQL exposes a single endpoint.</p>
<p reveal>Consumers read data from the graph with <code>Queries</code>, and change data on the graph with <code>Mutations</code></p>
<section reveal>
<p>By analogy to REST:</p>
<dl class="analogy">
<dt><code>GET</code></dt>
<dd><code>query</code></dd>
<dt><code>POST</code>,<br/><code>PUT</code>,<br/><code>DELETE</code></dt>
<dd><code>mutation</code></dd>
</dl>
</section>
</slidem-slide>
<slidem-slide name="example-query">
<h2>Queries</h2>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```graphql
query PersonQuery {
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
query PersonQuery($id: ID!) {
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
query PersonQuery($id: ID!) { # query document
person(id: $id) { # query resolver
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
query PersonQuery($id: ID!) {
person(id: $id) {
name
picture
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
query PersonQuery($id: ID!) {
person(id: $id) {
name
picture
friends {
name
}
}
}
```
</script>
</zero-md>
<json-viewer reveal>
<script type="application/json">
{
"data": {
"person": {
"name": "Boris Johnson",
"picture": "https://www.pri.org/file/london-mayor-boris-johnson-zip-line-2012-01-08jpg",
"friends": [
{ "name": "Dominic Raab" },
{ "name": "Sajid Javid" },
{ "name": "Priti Patel" }
]
}
}
}
</script>
</json-viewer>
</figure>
</slidem-slide>
<slidem-slide name="example-database">
<p>Even if the database schema doesn't match your query...</p>
<json-viewer>
<script type="application/json">
{
"id": "bojojo",
"first_name": "Boris",
"last_name": "Johnson",
"address": "10 Downing Street,London,UK",
"friend_ids": [ "raabster1974", "sajidlad", "pat-l" ]
}
</script>
</json-viewer>
<p>...you can still respond sensibly.</p>
</slidem-slide>
<slidem-slide name="schema-resolvers">
<section>
<p>The GraphQL Schema tells your server the type of each object.</p>
<figure class="progressive" style="height:6em">
<zero-md>
<script type="text/markdown">
```graphql
type Person {
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
type Person {
name: String
picture: String
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
type Person {
name: String
picture: String
friends: [Person]
}
```
</script>
</zero-md>
</figure>
</section>
<section reveal>
<p>The resolvers define the contents of each field.</p>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```js
export const friends =
(parent, args, context) =>
parent.friends
.map(context.dataSources.Person.getPersonById)
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
export const friends =
(parent, args, context) =>
parent.friends
.map(context.dataSources.Person.getPersonById)
export const picture =
(parent, args, context) =>
context.dataSources.Person.getPictureById(parent.id)
```
</script>
</zero-md>
</figure>
</section>
</slidem-slide>
<slidem-slide name="apollo">
<h2 fit uppercase color="--primary">Apollo</h2>
<p reveal>An opinionated framework for implementing GraphQL Apps</p>
<section grid>
<article reveal id="apollo-client">
<h3>Apollo Client</h3>
<ul>
<li>Front-end data store</li>
<li>"Redux", but GraphQL</li>
<li>Network & Client State</li>
</ul>
</article>
<article reveal id="apollo-server">
<h3>Apollo Server</h3>
<ul>
<li>NodeJS Framework</li>
<li>Quickly Bootstrap your Server</li>
<li>Deploy to Cloud Providers</li>
</ul>
</article>
</section>
</slidem-slide>
<slidem-slide name="apollo-client">
<h2>Apollo Client</h2>
<p>Stores its data in a <strong>normalized cache</strong></p>
<p>Manage <strong>local state</strong> with GraphQL queries and mutations</p>
<figure class="progressive">
<zero-md reveal>
<script type="text/markdown">
```graphql
query Dashboard {
kpiCharts {
id
chartType
series { title data { x y } }
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```graphql
query Dashboard {
kpiCharts {
id
chartType
series { title data { x y } }
expanded @client
}
}
```
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="apollo-elements">
<h2 fit uppercase color="--primary">Apollo Elements</h2>
<p>Base-classes and Mixins for many Web Component Libraries</p>
<figure reveal>
<figcaption>
Apollo Client,
<em>but <strong>web components</strong></em>
</figcaption>
<img alt="Super Nintendo Chalmers" src="steamed.jpg"/>
</figure>
</slidem-slide>
<slidem-slide name="apollo-elements-mixins">
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```js
class PersonElement extends HTMLElement {
constructor() {
super();
this.attachShadow({ mode: 'open' });
}
}
customElements.define('person-element', PersonElement);
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import { ApolloQueryMixin } from '@apollo-elements/mixins';
class PersonElement extends ApolloQueryMixin(HTMLElement) {
constructor() { /* ... */ }
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import { ApolloQueryMixin } from '@apollo-elements/mixins';
class PersonElement extends ApolloQueryMixin(HTMLElement) {
constructor() { /* ... */ }
attributeChangedCallback(name, old, id) {
switch (name) {
case 'person-id': this.variables = val ? { id }; break;
default: this.variables = null;
}
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import { ApolloQueryMixin } from '@apollo-elements/mixins';
class PersonElement extends ApolloQueryMixin(HTMLElement) {
get data() { return this._data; }
set data(data) {
this._data = data;
const { name, friends } = data.person;
this.shadowRoot.innerHTML =
friends.map(friend => `${name || 'Someone'} 💗 ${friend.name}\n`)
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import './person-element';
import gql from 'graphql-tag';
const element = document.createElement('person-element');
element.setAttribute('person-id', 'bojojo');
element.query = gql`
query PersonQuery($id: ID!) {
person(id: $id) {
name
picture
friends {
name
}
}
}
`;
```
</script>
</zero-md>
<zero-md reveal>
<!-- NB: uses a zero-width-joiner char in the closing script tag inside the fenced code block -->
<script type="text/markdown">
```html
<person-element person-id="bojojo">
<script type="application/graphql">
query PersonQuery($id: ID!) {
person(id: $id) {
name
picture
friends {
name
}
}
}
</script>
</person-element>
<blink>😎</blink>
```
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="lit-apollo">
<h2 fit uppercase color="--primary">lit-apollo</h2>
<p>👩🚀 Apollo for Data Layer</p>
<p>🚒 <code>LitElement</code> for View Layer & Reactivity</p>
<p>✅ TypeScript typings</p>
<section reveal>
<p>🤝 Pairs well with...</p>
<ul>
<li><code>rollup-plugin-graphql</code></li>
<li><code>rollup-plugin-lit-css</code></li>
<li><code>graphql-codegen</code></li>
</ul>
</section>
</slidem-slide>
<slidem-slide name="lit-apollo-query">
<h2><code>ApolloQuery</code> base class</h2>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```typescript
import { ApolloQuery } from '@apollo-elements/lit-apollo';
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```typescript
import { ApolloQuery, customElement, property, html } from '@apollo-elements/lit-apollo';
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```typescript
import { ApolloQuery, customElement, property, html } from '@apollo-elements/lit-apollo';
import PersonQuery from './Person.query.graphql'; // rollup-plugin-graphql
import styles from './person-query.css'; // rollup-plugin-lit-css
import type { Person } from '../../generated/schema'; // graphql-codegen
```
</script>
</zero-md>
<img reveal
center
style="top:calc(6em)"
src="file-tree.png"
alt="file tree with three files: person-element.ts, person-element.css, and Person.query.graphql"/>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```typescript
interface Data { person: Person; }
interface Variables { id: string; }
@customElement('person-element')
class PersonElement extends ApolloQuery<Data, Variables> {
@property({ attribute: 'person-id' }) personId: string = null;
static styles = [styles];
get variables() {
return { id: this.personId };
}
}
```
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```typescript
@customElement('person-element')
class PersonElement extends ApolloQuery<↔️> {
render() {
const { name, friends } = this.data.person;
return html`
${friends.map(friend => `${ name|| 'Someone'} 💗 ${friend.name}`)}
`;
}
}
```
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="lit-apollo-mutation">
<h2>Mutations</h2>
<p>Write UI components that update your graph</p>
</slidem-slide>
<slidem-slide name="lit-apollo-mutation">
<h2>Mutations</h2>
<p>Say we had a list component that should toggle an `isBestFriend` flag on any member of the list.</p>
<zero-md>
<script type="text/markdown">
```js
class FriendsList extends ApolloQuery {
render() {
return html`${this.data.friends.map(friend => html`
<toggle-friend .friend="${friend}"></toggle-friend>
`)}`;
}
}
```
</script>
</zero-md>
<section reveal>
<p>Let's define <code><toggle-friend></code> as a mutation component!</p>
<zero-md>
<script type="text/markdown">
```graphql
mutation ToggleBestFriendMutation($friendId: ID!) {
toggleBestFriend(friendId: $friendId) {
id name picture
isBestFriend
}
}
```
</script>
</zero-md>
</section>
</slidem-slide>
<slidem-slide name="mutations-dom">
<h2>Mutations - DOM</h2>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```js
import { ApolloMutation } from '@apollo-elements/lit-apollo';
class ToggleBestFriend extends ApolloMutation {
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import { ApolloMutation, customElement, property, html } from '@apollo-elements/lit-apollo';
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
@property({ attribute: false }) friend: Person;
render() {
return html`
<label for="button">${this.friend.name}</label>
<button id="button" @click="${() => this.mutate()}">
${this.isBestFriend ? '💔' : '💕'}
</button>
`;
}
}
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="mutations-optimistic">
<h2>Mutations - Optimistic UI</h2>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```js
import ToggleBestFriendMutation from './ToggleBestFriend.mutation.graphql';
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
mutation = ToggleBestFriendMutation;
get variables() { return { friendId: this.friend.id; } }
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import ToggleBestFriendMutation from './ToggleBestFriend.mutation.graphql';
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
mutation = ToggleBestFriendMutation;
get variables() { return { friendId: this.friend.id; } }
get optimisticResponse() {
return { __typename: "Mutation",
toggleBestFriend: { __typename: "Person",
id: this.variables.friendId,
isBestFriend: !this.isBestFriend,
}
}
}
}
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="mutations-update">
<h2>Mutations - Updating the Cache</h2>
<figure class="progressive">
<zero-md>
<script type="text/markdown">
```js
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
onUpdate(cache, { data: { toggleBestFriend: friend } }) {
}
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import FriendsListQuery from '../friends-list/FriendsList.query.graphql';
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
onUpdate(cache, { data: { toggleBestFriend: friend } }) {
const query = FriendsListQuery;
const existing = cache.readQuery({ query });
}
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
onUpdate(cache, { data: { toggleBestFriend: friend } }) {
const friends =
friend.isBestFriend ? [...existing.friends, friend]
: existing.friends.filter(friend => friend.id !== friend.id);
}
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
onUpdate(cache, { data: { toggleBestFriend: friend } }) {
const data = { ...existing, friends };
cache.writeQuery({ query, data });
}
}
</script>
</zero-md>
<zero-md reveal>
<script type="text/markdown">
```js
import ToggleBestFriendMutation from './ToggleBestFriend.mutation.graphql';
import FriendsListQuery from '../friends-list/FriendsList.query.graphql';
@customElement('toggle-friend')
class ToggleBestFriend extends ApolloMutation {
onUpdate(cache, { data: { toggleBestFriend: friend } }) {
const query = FriendsListQuery;
const existing = cache.readQuery({ query });
const friends =
friend.isBestFriend ? [...existing.friends, friend]
: existing.friends.filter(friend => friend.id !== friend.id);
const data = { ...existing, friends };
cache.writeQuery({ query, data });
}
}
</script>
</zero-md>
</figure>
</slidem-slide>
<slidem-slide name="cool-tricks"
slide-in
cover
background="https://media.giphy.com/media/Utu9EoKlfEyVF082Ks/giphy.gif">
<h2 class="white-shadow"
fit
center
uppercase
color="black">
Cool Tricks
</h2>
</slidem-slide>
<slidem-slide name="lazy-resolvers">
<h2>Lazy-Loaded Resolvers</h2>
<p>Only load resolvers when components are needed.</p>
<p>Leverage the PRPL-pattern to keep the UX snappy.</p>
<figure class="progressive">