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
Hijrah ke TypeScript
Search
Ariya Hidayat
December 11, 2019
Programming
0
420
Hijrah ke TypeScript
Ariya Hidayat
December 11, 2019
Tweet
Share
More Decks by Ariya Hidayat
See All by Ariya Hidayat
RAG for Small LLM
ariya
0
130
Vector Search and LLM
ariya
0
130
Making a Bigger Impact with Open Source
ariya
0
78
Practical Testing of Firebase Projects
ariya
0
96
Practical CI/CD for React Native
ariya
0
110
Unggul dan Berdikari dengan Open-source
ariya
0
270
Practical CI/CD for React Native
ariya
1
440
Integrasi Berkesinambungan untuk React Native
ariya
1
380
Fungsional dengan JavaScript
ariya
0
280
Other Decks in Programming
See All in Programming
さいきょうのレイヤードアーキテクチャについて考えてみた
yahiru
3
750
第3回関東Kaggler会_AtCoderはKaggleの役に立つ
chettub
3
1k
2024年のkintone API振り返りと2025年 / kintone API look back in 2024
tasshi
0
220
Pulsar2 を雰囲気で使ってみよう
anoken
0
230
密集、ドキュメントのコロケーション with AWS Lambda
satoshi256kbyte
0
190
Pythonでもちょっとリッチな見た目のアプリを設計してみる
ueponx
1
550
CNCF Project の作者が考えている OSS の運営
utam0k
6
710
Conform を推す - Advocating for Conform
mizoguchicoji
3
690
Lottieアニメーションをカスタマイズしてみた
tahia910
0
120
データベースのオペレーターであるCloudNativePGがStatefulSetを使わない理由に迫る
nnaka2992
0
130
ARA Ansible for the teams
kksat
0
150
苦しいTiDBへの移行を乗り越えて快適な運用を目指す
leveragestech
0
510
Featured
See All Featured
Building Applications with DynamoDB
mza
93
6.2k
The MySQL Ecosystem @ GitHub 2015
samlambert
250
12k
For a Future-Friendly Web
brad_frost
176
9.5k
Build The Right Thing And Hit Your Dates
maggiecrowley
34
2.5k
A Philosophy of Restraint
colly
203
16k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
The World Runs on Bad Software
bkeepers
PRO
67
11k
Documentation Writing (for coders)
carmenintech
67
4.6k
Optimising Largest Contentful Paint
csswizardry
34
3.1k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Docker and Python
trallard
44
3.3k
Facilitating Awesome Meetings
lara
51
6.2k
Transcript
Hijrah ke TypeScript https://unsplash.com/photos/Fq--9iqymkI
With great power, comes great responsibility -- Gundala
Konon, di jaman purbakala…
None
> biodata = { nama: 'Budi', umur: 34 } {
nama: 'Budi', umur: 34 } > console.log(biodata.usia) undefined
> biodata = { nama: 'Budi', umur: 34 } {
nama: 'Budi', umur: 34 } > console.log(biodata.umur) 34
export class LoginForm extends Component { static propTypes = {
submitAction: PropTypes.func.require, } }
None
None
None
None
Jenazah engineer bikin rusuh karena dulu nggak pakai TypeScript
Transisi Gradual
{ "compilerOptions": { "target": "esnext", "module": "commonjs", "allowJs": true, "checkJs":
true, "noEmit": true, "skipLibCheck": true "noEmitOnError": true, "jsx": "react-native", "moduleResolution": "node", "esModuleInterop": true }, "include": ["**/*.js"], "exclude": ["thirdparty/**.js"] } tsconfig.json
> npm install –save typescript
import React, { Component } from 'react'; Could not find
a declaration file for module ‘react’
> npm install –save @types/react > npm install –save @types/react-native
Property 'require' does not exist on type 'Requireable<(...args: any[]) =>
any>’. ts(2339)
None
diff --git a/package.json b/package.json index c9a3d0c..c0dfca4 100644 --- a/package.json +++
b/package.json @@ -4,6 +4,7 @@ "description": "", "main": "src/index.js", "scripts": { + "typecheck": "tsc -p src" }, "author": ""
> npm run typecheck src/LoginForm.js:16:38 - error TS2339: Property 'require'
does not exist on type 'Requireable<(...args: any[]) => any>’. 16 submitAction: PropTypes.func.require, ~~~~~~~ CI/CD
None
function todayIsNotWeekend() { const day = moment().utcOffset(7).isoWeekday(); const SATURDAY =
6; const SUNDAY = 0; return (day !== SATURDAY) || (day !== SUNDAY); }
> npm run typecheck src/Order.js:7:35 - error TS2367: This condition
will always return 'true' since the types '6' and '0' have no overlap. 7 return (day !== SATURDAY) || (day !== SUNDAY); ~~~~~~~~~~~~~~
function todayIsNotWeekend() { const day = moment().utcOffset(7).isoWeekday(); const SATURDAY =
6; const SUNDAY = 0; return (day !== SATURDAY) && (day !== SUNDAY); }
function todayIsWeekend() { const day = moment().utcOffset(7).isoWeekday(); const SATURDAY =
6; const SUNDAY = 0; return (day === SATURDAY) || (day === SUNDAY); } export function todayIsNotWeekend() { return !todayIsWeekend(); }
render() { return ( (!unreadCount > 0) ? <ClearIcon/> :
<BellIcon/> ) }
> npm run typecheck src/Inbox.js:12:14 - error TS2365: Operator '>'
cannot be applied to types 'boolean' and 'number'. 12 (!unreadCount > 0) ? <BellIcon/> : <ClearIcon/> ~~~~~~~~~~~~~~~~
!unreadCount > 0 (!unreadCount) > 0 Boolean Number
render() { return ( (unreadCount == 0) ? <ClearIcon/> :
<BellIcon/> ) }
validate() { let {email} = this.state; if (isValidEmail(this.email)) { this.setState({message:
''}); } else { this.setState({message: INVALID_EMAIL}); } }
> npm run typecheck src/LoginForm.js:15:29 - error TS2339: Property 'email'
does not exist on type 'LoginForm'. 15 if (isValidEmail(this.email)) { ~~~~~
validate() { let {email} = this.state; if (isValidEmail(email)) { this.setState({message:
''}); } else { this.setState({message: INVALID_EMAIL}); } }
Musuhnya kebanyakan nih
> npm install –save tsc-silent
diff --git a/package.json b/package.json index be761d1..58a2aca 100644 --- a/package.json +++
b/package.json @@ -4,7 +4,7 @@ "description": "", "main": "src/index.js", "scripts": { - "typecheck": "tsc -p src" + "typecheck": "tsc-silent -p src/tsconfig.json --suppressConfig src/tsc-silent.config.js" }, "author": "", "license": "ISC",
module.exports = { suppress: [ { pathRegExp: '/.*.js$', codes: [
2339, 2367 ] } ] } tsc-silent.config.js
> npm run typecheck Visible errors: 0, suppressed errors: 2
None
None
Engineering Excellence
Rekayasa Paripurna
Some artworks are from http://openclipart.org. @ariya114