Slides from the talk I gave at MelbJS last Wednesday

3. I A M N O T A N E X P E R T
I N Y A R N
J U S T A J A V A S C R I P T D E V E L O P E R

6. NPM IS AMAZING

7. NPM IS
HUGE

9. RANGE SPECIFIERS
PROBLEM
^1.2.3 ~1.2.3
NOT DETERMINISTIC
~node_modules

11. RANGE SPECIFIERS
PROBLEM
^1.2.3 ~1.2.3
NOT DETERMINISTIC
~node_modules

12. NPM IS SLOW
PROBLEM
SEQUENTIAL
DOWNLOADING

14. OFFLINE DEVELOPMENT
PROBLEM
NPM DOESNT
WORK OFFLINE

15. CI BUNDLING
OFFLINE
NODE_MODULES
MUST MATCH
PACKAGE.JSON

17. PREPUBLISH?
NPWTFM?

21. RANGE SPECIFIERS
PROBLEM
^1.2.3 ~1.2.3
NOT DETERMINISTIC
~node_modules

22. FIXED VERSIONS?
RANGE SPECIFIERS
PROBLEM
SUB DEPENDENCIES
NOT FIXED

24. FIXED VERSIONS?
RANGE SPECIFIERS
PROBLEM
SUB DEPENDENCIES
NOT FIXED

26. NPM SHRINKWRAP?
RANGE SPECIFIERS
PROBLEM
REQUIRES
EXPLICIT SYNC

27. COMMIT MODULES?
RANGE SPECIFIERS
PROBLEM
100S OF FILES IN PR
MUST DEVELOP VIRTUALIZATION
HELPS WITH DEV - PRODUCTION INTEGRITY

29. OFFLINE DEVELOPMENT
PROBLEM
NPM DOESNT
WORK OFFLINE

30. NPM CACHE-MIN?
OFFLINE DEVELOPMENT
PROBLEM
NPM --CACHE-MIN INFINITY INSTALL LEFT-PAD
- STILL NEEDS CONNECTIVITY
- FRAGILE

31. LOCAL REGISTRIES?
OFFLINE DEVELOPMENT
PROBLEM
- SINOPEA
- LOCAL-NPM
- NPM_LAZY

33. LOCAL REGISTRIES?
OFFLINE DEVELOPMENT
PROBLEM
- SINOPEA
- LOCAL-NPM
- NPM_LAZY

34. GOOD PRACTICE IS OPT
IN
PROBLEM
SHRINKWRAP
SAVING TO MANIFEST

35. TEAM CONVENTIONS?
GOOD PRACTICES ARE OPT IN
PROBLEM
HARD TO ENSURE PEOPLE FOLLOW

36. PRECOMMIT HOOKS?
GOOD PRACTICES ARE OPT IN
PROBLEM
CAN BE DISABLED

37. CUSTOM SCRIPTS?
GOOD PRACTICES ARE OPT IN
PROBLEM
- GO AGAINST CONVENTION
- GIT WORKFLOW ISSUES
- NEW THING
- DEVELOPERS RESPONSIBILITY

38. NPM IS STILL SLOW
HOWEVER...
BUT LOCAL REGISTRIES AS CACHES HELP

39. SHARING NODE_MODULES?
BUNDLING CI
PROBLEM
- GLOBAL NODE_MODULES FOLDER
- PACKAGE.JSON HASH
- DOCKER CONTAINER CHANGES
- NON-DETERMINISM CAUSES ISSUES

40. PREPUBLISH
NPWTFM
- DEAL WITH IT
- IN-PUBLISH

41. SAM BOYER
PACKAGE MANAGER
FOR GOLANG
GLIDE

42. "SOFTWARE IS TERRIBLE"
SAM BOYER

43. "PEOPLE ARE TERRIBLE"
SAM BOYER

44. "THERE ARE TOO MANY DIFFERENT
SCENARIOS"
SAM BOYER

45. "NOTHING WILL REALLY
WORK FOR SURE"
SAM BOYER

46. "IT’S PROVABLE THAT
NOTHING WILL REALLY
WORK FOR SURE"
SAM BOYER

47. "OUR LIVES ARE
MEANINGLESS PERTURBATIONS
IN A SWIRLING VORTEX
OF CHAOS AND ENTROPY"
SAM BOYER

50. NEW NPM CLIENT

51. DOUBLE THE SPEED
Compared with npm 3

52. OFFLINE MIRROR
echo 'yarn-offline-mirror "./my-cache"' > .yarnrc
rm -rf yarn.lock && yarn

53. DETERMINISTIC
node_modules same everytime

54. YARN.LOCK
Similar to npm-shrinkwrap

55. AUTOMATIC MANIFEST SYNC
yarn add left-pad
yarn add mocha --dev

56. PACKAGE VALIDATION
Package integrity validated
by checksum

58. WORKFLOW
Install and setup a project
DEMO

60. SPEED DEMO

62. OFFLINE MIRROR
Install dependencies without
an internet connection
DEMO

64. RUN SCRIPTS
Scripts are run based on
pattern matching
DEMO

66. YARN IS STILL WIP
MACOS SEEMS SOLID
POS. ISSUES w/PRIVATE MODULES IN DOCKER
STILL UNPROVEN FOR US IN CI
(WERE WORKING ON IT)
HMM...

67. YARN HAS QUIRKS
OFFLINE CACHE .yarnrc
GITHUB URLS
STILL HAS PREPUBLISH
HMM...

68. YARN > NPM
YARN IS LONGER TO TYPE THAN NPM
NITPICK...

69. HTTP://YARNPKG.COM

71. THANK
YOU

72. http://yarnpkg.com/en/docs
https://yarnpkg.com/blog/2016/11/24/offline-mirror
https://yarnpkg.com/en/docs/migrating-from-npm
https://www.youtube.com/watch?v=Mou6JzfZVf0
http://github.com/ryardley/yarn-talk
contact@rudiyardley.com
github.com/ryardley
twitter.com/rudiyardley
YARN