renovate/docs/shareable-configs.md
Rhys Arkins ad40f0abd8 feat: shareable preset configs (#658)
This PR implements eslint-inspired shareable configs. With this feature, we:
- Add new config option "extends"
  * This is an array of preset config names that the current config or preset extends/inherits from
- Add new config option "description"
  * Each preset config should include a description of its functionality that is human-readable
- Provide a set of commonly use configs called "preset defaults"
- Provide two "full" preset configs: "app" and "library"
   * Almost the same but app pins *all* version numbers while library only pins devdependencies
- Replace regular config in onboarding with one of these two presets
- Generate human-readable description of config in Onboarding PR
- Support npm for hosting configs (both scoped and non-scoped)

Closes #657, Closes #671, Closes #647
2017-08-18 06:10:19 +02:00

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# Preset configs
Renovate uses the term "presets" to refer to shareable config snippets, similar to eslint. Unlike eslint though:
- Presets may be as small as a list of package names, or as large as a full config
- Shared config files can contain many presets
## Preset config URIs
In human-understandable form, the rules are:
- A full preset URI consists of package name, preset name, and preset parameters, such as `package:preset(param)`
- If a package scope is specified and no package, then the package name is assumed to be `renovate-config`, e.g. `@rarkins:webapp` is expanded to `@rarkins/renovate-config:webapp`
- If a non-scoped package is specified then it is assumed to have prefix `renovate-config-`. e.g. `rarkins:webapp` is expanded to `renovate-config-rarkins:webapp`
- If a package name is specified and no preset name, then `default` is assumed, e.g. `@rarkins` expands in full to `@rarkins/renovate-config:default` and `rarkins` expands in full to `renovate-config-rarkins:default`
- There is a special "default" namespace where no package name is necessary. e.g. `:webapp` (not the leading `:`) expands to `renovate-config-default:webapp`
## Supported config syntax
### Scoped
```
@somescope
```
This will resolve to use the preset `default` in the npm package `@somescope/renovate-config`.
### Scoped with package name
```
@somescope/somepackagename
```
This will resolve to use the preset `default` in the npm package `@somescope/somepackagename`.
### Scoped with preset name
```
@somescope:webapp
```
This will resolve to use the preset `webapp` in the npm package `@somescope/renovate-config`.
### Scoped with params
```
@somescope(eslint, stylelint)
```
This will resolve to use the preset `default` in the npm package `@somescope/renovate-config` and pass the parameters `eslint` and `stylelint`.
### Scoped with preset name and params
```
@somescope:webapp(eslint, stylelint)
```
This will resolve to use the preset `webapp` in the npm package `@somescope/renovate-config` and pass the parameters `eslint` and `stylelint`.
### Scoped with package name and preset name
```
@somescope/somepackagename:webapp
```
This will resolve to use the preset `webapp` in the npm package `@somescope/somepackagename`.
### Scoped with package name and preset name and params
```
@somescope/somepackagename:webapp(eslint, stylelint)
```
This will resolve to use the preset `webapp` in the npm package `@somescope/somepackagename` and pass the parameters `eslint` and `stylelint`.
### Non-scoped short with preset name
Note: if using non-scoped packages, a preset name is mandatory.
```
somepackagename:default
```
This will resolve to use the preset `default` in the npm package `renovate-config-somepackagename`.
### Non-scoped short with preset name and params
Note: if using non-scoped packages, a preset name is mandatory.
```
somepackagename:default(eslint)
```
This will resolve to use the preset `default` in the npm package `renovate-config-somepackagename` with param `eslint`.
### Non-scoped full with preset name
Note: if using non-scoped packages, a preset name is mandatory.
```
renovate-config-somepackagename:default
```
This will resolve to use the preset `default` in the npm package `renovate-config-somepackagename`.
### Non-scoped full with preset name and params
Note: if using non-scoped packages, a preset name is mandatory.
```
renovate-config-somepackagename:default(eslint)
```
This will resolve to use the preset `default` in the npm package `renovate-config-somepackagename` and param `eslint`.