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Mythical trees and where to find them
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Gabriele Petronella
November 11, 2017
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Mythical trees and where to find them
An introduction to ASTs in JavaScript
Gabriele Petronella
November 11, 2017
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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