/lerna-nx-cache-works

Primary LanguageTypeScript

Description

This repository showcases a working example of lerna + nx caching.

Pre-requisites

Successfully tested with the following.

  • OS: Windows 10
  • Node: v18.15.0
  • Yarn: 1.22.19
  • Lerna: 6.6.2

Reproduction steps

  • Run yarn

    • For repeated attempts - run npx nx reset to clear existing cache

  • Run yarn build

    • Get output like this, cache not used:
    yarn run v1.22.19
$ lerna run build --scope='example-*'
lerna notice cli v6.6.2
lerna info versioning independent
lerna notice filter including "example-*"
lerna info filter [ 'example-*' ]

    √  example-lib-2:build (2s)
    √  example-lib-1:build (2s)

 >  Lerna (powered by Nx)   Successfully ran target build for 2 projects (3s)

Done in 5.46s.

  • Run yarn build again:

    • Get output like this, cache used for both libs:
    yarn run v1.22.19
$ lerna run build --scope='example-*'
lerna notice cli v6.6.2
lerna info versioning independent
lerna notice filter including "example-*"
lerna info filter [ 'example-*' ]

    √  example-lib-2:build  [existing outputs match the cache, left as is]
    √  example-lib-1:build  [existing outputs match the cache, left as is]


 >  Lerna (powered by Nx)   Successfully ran target build for 2 projects     (61ms)

   Nx read the output from the cache instead of running the command for 2 out    of 2 tasks.

Done in 2.25s.

  • Adjust the index.ts in one of the libs, e.g. "Hello World 2!" -> "Hello World 3!"

  • Run yarn build again:

    • Get output like this, cache is used only for unchanged lib:
    yarn run v1.22.19
$ lerna run build --scope='example-*'
lerna notice cli v6.6.2
lerna info versioning independent
lerna notice filter including "example-*"
lerna info filter [ 'example-*' ]

    √  example-lib-1:build  [existing outputs match the cache, left as is]
    √  example-lib-2:build (2s)

 >  Lerna (powered by Nx)   Successfully ran target build for 2 projects (2s)

   Nx read the output from the cache instead of running the command for 1 out of 2 tasks.

Done in 4.60s.