TypeScript + lerna + yarn monorepos FTW

1. TypeScript + lerna + yarn monorepos FTW Paris TypeScript #10 10/10/2017 1
2. Me, myself & I Paul Souche Front End developer @S_A_N_T_E_C_H In love with TypeScript since 2014 @paul.souche paulsouche @paulsouche 2
3. Multi repos : why ? - Monoliths no more - Build only the necessary - Clearer subversion history - Easier revert - 1 app > 1 repo - 1 service > 1 repo... 3
4. Multi repos : but ... - Switch project all the time - Sequential builds - Evergreen anti pattern - Dependencies - Versioning - Features branch 4
5. - Build everything everytime - Build order - Subversion Conflicts - Licenses 5 Did you said monorepo?
6. 6 DEPENDENCIES APP 1 DEPENDENCIES APP 2 Projects architecture
7. Editor architecture 7 DEPENDENCIES COMMON 2 COMMON 1 APP 1 APP 2 APP 3 APP 4
8. Lerna << Lerna is a tool that optimizes the workflow around managing multi-package repositories with git and npm >> 8
9. Prerequisites 9
10. Lerna project structure - lerna import <path to package> - lerna bootstrap 10
11. What it does 11
12. Demo 12
13. Yeah… But ? - devDependencies are the same so lerna bootstrap could be very slow for more packages (cache) - Build is sequential 13
14. yarn workspaces 14
15. Lerna config 15
16. What happen to the structure 16
17. Demo 17
18. Build 18 - Several flags such as --parallel I won’t talk about - Bash is always the answer for uncommon problems
19. That’s all folks THANKS References Lerna Yarn workspaces Demo 19