Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Mythical trees and where to find them
Search
Gabriele Petronella
November 11, 2017
Programming
0
230
Mythical trees and where to find them
An introduction to ASTs in JavaScript
Gabriele Petronella
November 11, 2017
Tweet
Share
More Decks by Gabriele Petronella
See All by Gabriele Petronella
Design System Adventures in React - ReactJS Day 2024
gabro
0
100
Design System Adventures in React
gabro
1
99
Casting Metals
gabro
0
360
Functional Programming in front-end applications
gabro
1
230
Functional Programming in Front-end Applications
gabro
3
180
How to get away with Functional Programming in front-end applications
gabro
3
1.5k
Bridging the tooling gap with Scala.js
gabro
0
280
Monad Transformers Down to Earth
gabro
2
2.6k
Move fast and fix things
gabro
0
340
Other Decks in Programming
See All in Programming
Serena MCPのすすめ
wadakatu
4
910
ソフトウェア設計の実践的な考え方
masuda220
PRO
3
500
階層構造を表現するデータ構造とリファクタリング 〜1年で10倍成長したプロダクトの変化と課題〜
yuhisatoxxx
3
930
SpecKitでどこまでできる? コストはどれくらい?
leveragestech
0
580
Чего вы не знали о строках в Python – Василий Рябов, PythoNN
sobolevn
0
160
Pythonスレッドとは結局何なのか? CPython実装から見るNoGIL時代の変化
curekoshimizu
5
1.4k
CI_CD「健康診断」のススメ。現場でのボトルネック特定から、健康診断を通じた組織的な改善手法
teamlab
PRO
0
180
CSC305 Lecture 03
javiergs
PRO
0
240
アメ車でサンノゼを走ってきたよ!
s_shimotori
0
160
Signals & Resource API in Angular: 3 Effective Rules for Your Architecture @BASTA 2025 in Mainz
manfredsteyer
PRO
0
110
エンジニアとして高みを目指す、 利益を生み出す設計の考え方 / design-for-profit
minodriven
23
12k
Web フロントエンドエンジニアに開かれる AI Agent プロダクト開発 - Vercel AI SDK を観察して AI Agent と仲良くなろう! #FEC余熱NIGHT
izumin5210
3
420
Featured
See All Featured
For a Future-Friendly Web
brad_frost
180
9.9k
Speed Design
sergeychernyshev
32
1.1k
Practical Orchestrator
shlominoach
190
11k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Optimizing for Happiness
mojombo
379
70k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.5k
The Pragmatic Product Professional
lauravandoore
36
6.9k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
890
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
It's Worth the Effort
3n
187
28k
Done Done
chrislema
185
16k
Transcript
Mythical Trees and where to find them Gabriele Petronella Software
Engineer @ buildo
me, hi! @gabro27 - Codemotion 11/11/2017
stuff I do (by day) @gabro27 - Codemotion 11/11/2017
stuff I do (by night) @gabro27 - Codemotion 11/11/2017
Why this talk @gabro27 - Codemotion 11/11/2017
Agenda 1.AST 2.AST workflows 3.A real-world example @gabro27 - Codemotion
11/11/2017
Let's start from the answer const answer = 42; @gabro27
- Codemotion 11/11/2017
Tokens const answer = 42 ; // | | |
| | | | | | | // \_'const'_/ \_name_/ \_'='_/ \_num_/ \_';'_/ @gabro27 - Codemotion 11/11/2017
Grammar const answer = 42 ; // | | |
| || // | \_Identifier__/ \_NumericLiteral_/| // | | | // | \_________VariableDeclarator________/ // | | // \____________VariableDeclaration____________/ @gabro27 - Codemotion 11/11/2017
So... AST? @gabro27 - Codemotion 11/11/2017
Abstract Syntax Tree @gabro27 - Codemotion 11/11/2017
Why Abstract? const answer = 42; const answer = 42
const answer = 42 const answer = 42 @gabro27 - Codemotion 11/11/2017
AST in JavaScript @gabro27 - Codemotion 11/11/2017
AST? ASTs! parser AST ES2017 ES next acorn ESTree ✅
only stage-4 babylon Babylon AST ✅ ✅ espree ESTree ✅ same as acorn esprima ESTree ✅ ❌ flow ESTree + custom ✅ ✅ TypeScript TypeScript AST ✅ ✅ @gabro27 - Codemotion 11/11/2017
astexplorer.net @gabro27 - Codemotion 11/11/2017
AST Workflows @gabro27 - Codemotion 11/11/2017
basic @gabro27 - Codemotion 11/11/2017
babel @gabro27 - Codemotion 11/11/2017
demo: literal transformation @gabro27 - Codemotion 11/11/2017
codemod @gabro27 - Codemotion 11/11/2017
hey, doesn't babel do the same thing? @gabro27 - Codemotion
11/11/2017
codemod tools » recast » jscodeshift @gabro27 - Codemotion 11/11/2017
eslint @gabro27 - Codemotion 11/11/2017
ESLint uses espree, so... What about ES next? @gabro27 -
Codemotion 11/11/2017
babel-eslint @gabro27 - Codemotion 11/11/2017
demo: no-console- log @gabro27 - Codemotion 11/11/2017
What about eslint --fix @gabro27 - Codemotion 11/11/2017
prettier @gabro27 - Codemotion 11/11/2017
Prettier... for TS? @gabro27 - Codemotion 11/11/2017
Meanwhile in the real world @gabro27 - Codemotion 11/11/2017
// MyContainer.js import t from 'tcomb'; import container from 'buildo-react-container';
import MyComponent from './MyComponent'; export default container(MyComponent, { connect: { isFlag: t.Boolean, name: t.String, label: t.maybe(t.String) } }); @gabro27 - Codemotion 11/11/2017
// state.js export default { isFlag: t.Boolean, name: t.String, label:
t.maybe(t.String) } @gabro27 - Codemotion 11/11/2017
// MyContainer.js import t from 'tcomb'; import container from 'buildo-react-container';
import MyComponent from './MyComponent'; export default container(MyComponent, { connect: ['isFlag', 'name', 'label'] }); @gabro27 - Codemotion 11/11/2017
DEMO @gabro27 - Codemotion 11/11/2017
We've seen @gabro27 - Codemotion 11/11/2017
AST: what and why @gabro27 - Codemotion 11/11/2017
Competing AST standards in JS @gabro27 - Codemotion 11/11/2017
Typical AST-based workflows @gabro27 - Codemotion 11/11/2017
Some resources » astexplorer.net » Babel Handbook @gabro27 - Codemotion
11/11/2017
Thank you @gabro27 - Codemotion 11/11/2017
Questions? ping me on Twitter: @gabro27 or @gabro on Slack
(http://milanojs.herokuapp.com/) PS: wanna work on this stuff? We're hiring! @gabro27 - Codemotion 11/11/2017