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
Walking through the source code of an OSS libra...
Search
kkeeth
May 21, 2022
Programming
0
200
Walking through the source code of an OSS library(ESLint)
kkeeth
May 21, 2022
Tweet
Share
More Decks by kkeeth
See All by kkeeth
Programming to play with p5.js
clown0082
0
13
とある EM の初めての育休からの学び
clown0082
1
3.6k
The history of Javascript frameworks: changes in front-end design philosophy
clown0082
2
170
Visually experience the beauty of mathematics with p5.js
clown0082
1
3k
Rediscover the joy of coding with Creative Coding
clown0082
0
1.6k
全員が意思決定する会社で開発者体験や生産性を見る大変さについて
clown0082
0
610
JavaScript × Mathematics go to Digital Art
clown0082
1
390
In-house study group at YUMEMI
clown0082
0
210
Playing Ionic Logo by p5.js
clown0082
0
280
Other Decks in Programming
See All in Programming
Java on Azure で LangGraph!
kohei3110
0
170
なんとなくわかった気になるブロックテーマ入門/contents.nagoya 2025 6.28
chiilog
1
190
都市をデータで見るってこういうこと PLATEAU属性情報入門
nokonoko1203
1
560
Deep Dive into ~/.claude/projects
hiragram
7
1.2k
Is Xcode slowly dying out in 2025?
uetyo
1
190
AIコーディング道場勉強会#2 君(エンジニア)たちはどう生きるか
misakiotb
1
240
既存デザインを変更せずにタップ領域を広げる方法
tahia910
1
240
AWS CDKの推しポイント 〜CloudFormationと比較してみた〜
akihisaikeda
3
310
#kanrk08 / 公開版 PicoRubyとマイコンでの自作トレーニング計測装置を用いたワークアウトの理想と現実
bash0c7
1
290
XP, Testing and ninja testing
m_seki
3
170
git worktree × Claude Code × MCP ~生成AI時代の並列開発フロー~
hisuzuya
1
420
イベントストーミング図からコードへの変換手順 / Procedure for Converting Event Storming Diagrams to Code
nrslib
1
300
Featured
See All Featured
Speed Design
sergeychernyshev
32
1k
Designing for humans not robots
tammielis
253
25k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.4k
Balancing Empowerment & Direction
lara
1
360
Music & Morning Musume
bryan
46
6.6k
Optimising Largest Contentful Paint
csswizardry
37
3.3k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
252
21k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
107
19k
Producing Creativity
orderedlist
PRO
346
40k
Navigating Team Friction
lara
187
15k
Transcript
Walking through the source code of an OSS library(ESLint)
'SPOUFOE&OHJOFFS-5 #FFS#BTI @kkeeth @kuwahara_jsri @kkeeth
Who am I const my_info = { Name: ‘Kuwahara KEETH
Kiyohito’, Company: ‘Yumemi Inc’, Position: ‘Servant Leader/Board’, Skills: ‘Riot.js/Next.js/Chit-chat’, }
Published
OQNKTDPNdLLFFUI
🙇 Sorry … 🙇 This slide is written in English.
However, I am still learning English, and there may be some inappropriate expressions. Plz feedback for me called “Masakari” about my talk!!
Let’s start 😆
one day in development 💁
*NDPODFSOFEBCPVUUIFCFIBWJPS PGUIJTEFQFOEFOUMJCSBSZ🤔 *TOUUIBUBIVSEMFUPCFHJOXJUI $BOZPVSFBMMZSFBEJU me my “inner voice” -FUTSFBEUIFDPEFPGUIJTMJCSBSZ
me
:FT CVU*EPOUVOEFSTUBOEXIBU UIJTMJCSBSZJTEPJOHBOE .BZCFZPVEPOUIBWFUIFUJNF *TUIBUFTTFOUJBMMZXIBUZPVXBOUUP TPMWF me my “inner
voice” *UEFQFOETPOUIFUIJOH CVU JOUFSJNTVQQPSUDBOCFBMJBCJMJUZ MBUFSPO me
#VUFWFOJGZPVVOEFSTUBOEUIF TPVSDFDPEF XIBUEPZPVEPXJUI JU my “inner voice” *GJUTBCVH JUTCFTUUPDSFBUFBO JTTVFPS13
me 8IFOEPZPVUIJOLUIBUXJMMCF SFTPMWFE %PZPVUIJOLJUXJMMCF EPOFPOUJNF my “inner voice”
*GOPU UIFXPSTUUIBUDBOIBQQFOJT UIBUXFGPSLUIFSFQPTJUPSZBOE MPBEUIFDIBOHFT 8IPJTHPJOHUPNBJOUBJOJU 8IBUTUIFDPTU me my “inner
voice” )NNN*HVFTTTP0LBZ MFUT KVTUBTTVNFUIBUTUIFEFTJHOJUT TVQQPTFEUPCF😅 me
*GOPU UIFXPSTUUIBUDBOIBQQFOJT UIBUXFGPSLUIFSFQPTJUPSZBOE MPBEUIFDIBOHFT 8IPJTHPJOHUPNBJOUBJOJU 8IBUTUIFDPTU me my “inner
voice” )NNN*HVFTTTP0LBZ MFUT KVTUBTTVNFUIBUTUIFEFTJHOJUT TVQQPTFEUPCF😅 me none of your business ʘ(^o^)ʗ
I feel like I could learn more from reading codes
😆
Then, let's read the source code of ESLint!
*NBHFCZIUUQTFTMJOUPSH
Basically, we start from the module written in the main
of package.json💁
Next, let’s look at “bin” dir.
Only 3 helper functions and an executable function here💁
None
Next, let’s look at “lib/cli.js” fi le.
None
“cli.js” depends on “ESLint” module “ESLint” module depends on “CLIEngine”
module
I found out later that...
There exists a dependency map💁 *NBHFCZIUUQTHJUIVCDPNFTMJOUFTMJOUCMPCNBJOEPDTTSDEFWFMPQFSHVJEFBSDIJUFDUVSFEFQFOEFODZTWH
Knowledge 1: Overall design
Unified format for writing each module📝
Uni fi ed format for writing each module
Uni fi ed format for writing each module
util objects rich in methods📝
w /PEFKTlVUJMzPCKFDU w MJCSVMFTVUJMTBTUVUJMT w MJCTIBSFETUSJOHVUJMT w MJCTIBSFETBTUVUJMT NFUIPET SFHHFYQBUUFSOT
w MJCTPVSDFDPEFUPLFOTUPSFVUJMT the number of using methods
Knowledge 2: Node.js’s “util” module is useful
w VUJMJOTQFDU w VUJMGPSNBU w VUJMJOIFSJUT w VUJMMQSPNJTJGZ ˡ8IBUTVSQSJTFENFXBTUIJT Methods
used by ESLint
*NBHFCZIUUQTOPEFKTPSHBQJVUJMIUNM
Knowledge 3: Generator functions in JavaScript
Do you understand the following code?💁
None
Let's take a look at some sample codes💁
None
None
None
more detail, show MDN👉
An afterthought
An afterthought w /PUXSJUUFOJOUZQFTDSJQU UZQFEF fi OJUJPOTBSFXSJUUFO w "OZXBZ
UIFEPDVNFOUBUJPOJTFYUFOTJWF w +4%PDJTXFMMEPDVNFOUFE BTJTNE w %PDVNFOUBUJPOJTVTJOH&MFWFOUZKT UZ w 5PPMTGPS44( w %PDVNFOUBUJPOBQQJTFBTJFSUPWJFXUIBOUIFP ff i DJBMTJUF w 5IFSFBSFBMTPDPODFQUTPGMBZPVUBOEDPNQPOFOUT
None
None
Thoughts💁
Thoughts w 8FEPOUIBWFUPVOEFSTUBOEJUUPUBMZ👍 w %FTJHOJOHGBNPVTMJCSBSJFTJTBHSFBUMFBSOJOHFYQFSJFODF👍 w 8FDBOJNQSPWFNZTLJMMTGPSTVSF👍 w *GZPV fi
OEJUEJ ff i DVMU ZPVDBOSFBEJUXJUITPNFPOFFMTF👍 w *GZPVIBWFUSPVCMF JU`THPPEUPSFBEGSPNUIFUFTUDPEF👍
None