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Update kbn-pm README for workspaces (#25766)

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Josh Dover 2018-11-16 08:20:50 -06:00 • committed by GitHub
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@ -52,7 +52,24 @@ scripts, while still having a nice developer experience.
## How it works
The approach we went for to handle multiple packages in Kibana is relying on
### Internal usage
For packages that are referenced within the Kibana repo itself (for example,
using the `@kbn/datemath` package from an `x-pack` plugin), we are leveraging
Yarn's workspaces feature. This allows yarn to optimize node_modules within
the entire repo to avoid duplicate modules by hoisting common packages as high
in the dependency tree as possible.
To reference a package from within the Kibana repo, simply use the current
version number from that package's package.json file. Then, running `yarn kbn
bootstrap` will symlink that package into your dependency tree. That means
you can make changes to `@kbn/datematch` and immediately have them available
in Kibana itself. No `npm publish` needed anymore — Kibana will always rely
directly on the code that's in the local packages.
### External Plugins
For external plugins, referencing packages in Kibana relies on
`link:` style dependencies in Yarn. With `link:` dependencies you specify the
relative location to a package instead of a version when adding it to
`package.json`. For example:
@ -62,11 +79,9 @@ relative location to a package instead of a version when adding it to
```
Now when you run `yarn` it will set up a symlink to this folder instead of
downloading code from the npm registry. That means you can make changes to
`@kbn/datematch` and immediately have them available in Kibana itself. No
`npm publish` needed anymore — Kibana will always rely directly on the code
that's in the local packages. And we can also do the same in x-pack-kibana or
any other Kibana plugin, e.g.
downloading code from the npm registry. This allows external plugins to always
use the versions of the package that is bundled with the Kibana version they
are running inside of.
```
"@kbn/datemath": "link:../../kibana/packages/kbn-date-math"
@ -191,10 +206,10 @@ While exploring the approach to static dependencies we built PoCs using npm 5
workspaces][yarn-workspaces], Yarn (using `link:` dependencies), and
[Lerna][lerna].
In the end we decided to build our own tool, based on Yarn and `link:`
dependencies. This gave us the control we wanted, and it fits nicely into our
context (e.g. where publishing to npm isn't necessarily something we want to
do).
In the end we decided to build our own tool, based on Yarn, and `link:`
dependencies, and workspaces. This gave us the control we wanted, and it fits
nicely into our context (e.g. where publishing to npm isn't necessarily
something we want to do).
### Some notes from this exploration