Advanced Node.js Linting with ESLint

I gave this talk at EmpireNode in 2016.

Transcript

1. ESLINT ADVANCED LINTING IN NODE.JS USING
2. LINTING WHY CARE ABOUT
3. Files changed 424 FILES CHANGED 424
4. YOU’RE MISSING
 A SEMI-COLON PAIR PROGRAMMING I USE STANDARD
 YOU IDIOT
5. LINTING MULTIPLIES YOUR POWER AS A LEAD ENGINEER Jamund Ferguson WHY CARE ABOUT LINTING?
6. PATTERNS RECOGNIZING AND ENFORCING
7. PATTERN ERROR HANDLING
8. ERROR HANDLING CALLBACK THROW PROMISE THESE ARE NOT ERRORS!
9. ERROR HANDLING
10. PATTERN CALLBACK
11. CALLBACK PATTERN WHERE’S THAT
 ERROR-FIRST? UNHANDLED
 ERROR UNHANDLED
 ERROR
12. CALLBACK PATTERN
13. PATTERN PROMISE
14. PROMISES
15. PROMISES
16. PATTERNS MISMATCHED
17. PATTERN MISMATCH: PROMISES VS. CALLBACK PATTERN CALLBACK PATTERN PROMISES
18. PATTERN MISMATCH: PROMISES VS. CALLBACK PATTERN MISSING ERROR HANDLER
19. PATTERN MISMATCH: PROMISES VS. CALLBACK PATTERN
20. PATTERN MISMATCH: PROMISES VS. CALLBACK PATTERN CALLBACK VERSION PROMISE VERSION
21. PATTERN MISMATCH POTENTIAL MISMATCHED PATTERNS ▸ ES6 Classes, Prototypes ▸ ES6 modules, CommonJS modules, AMD modules ▸ Connect middleware, Koa middleware, Alternatives… ▸ Early return, single in single out ▸ Factory, Singleton, etc. ▸ Lodash, Underscore or other competing modules
22. ESLINT RULES CREATING CUSTOM
23. astexplorer.net ABSTRACT SYNTAX TREE SOURCE CODE
24. ABSTRACT SYNTAX TREES: FUNCTIONS
25. ABSTRACT SYNTAX TREES: FUNCTIONS
26. ABSTRACT SYNTAX TREES: PROMISES
27. astexplorer.net
29. SOURCE CODE ABSTRACT SYNTAX TREE RULE CODE ESLINT OUTPUT
30. NO PROMISES IN CALLBACKS CUSTOM ESLINT RULE
31. CUSTOM LINT RULE: NO PROMISES INSIDE CALLBACKS CALLBACK PROMISES
32. TEXT
33. HOW WE DETECT A PROMISE CUSTOM LINT RULE: NO PROMISES INSIDE CALLBACKS
34. HOW ERROR REPORTING WORKS IN ESLINT RULES CUSTOM LINT RULE: NO PROMISES INSIDE CALLBACKS
35. TEXT
37. TEXT CLICK HERE
39. TEXT
40. TEXT DETECTING A PARENT CALLBACK FUNCTION
41. TEXT
42. TEXT NO ERORS NO CALLBACKS
43. DETECT CALLBACK DETECT PROMISE REPORT ERROR
45. ADVANCED LINTING IN NODE.JS USING ESLINT WHAT YOU NEED TO REMEMBER ▸ Recognize the patterns used in your code and make sure they’re being applied correctly ▸ Learn ASTs to help you succeed ▸ Apply lint rules that help you enforce best practices ▸ Create and share custom lint rules to scale your impact
46. THE END
47. QUESTIONS? Or reach out to @xjamundx on Twitter