In a large scale environment, it's beneficial for many projects to be built using the exact same Heft configuration.
There may be some minor differences -- for example, a Node.js project may emit CommonJS modules, whereas a web application
project may need to emit ESNext modules. But generally a small handful of common "profiles" will cover most projects.
The @rushstack/rig-package system provides a formalized
mechanism for moving common settings into an NPM package which gets added to the
"devDependencies" for the projects
that consume it. This is called a rig package. Note that several different rig profiles may come from the
same NPM package; each profile is a folder containing a set of config files.
Some concrete examples
Heft also provides two standard rig packages that you can use in your projects:
- @rushstack/heft-node-rig with a profile called
- @rushstack/heft-web-rig with profiles
It's also easy to define your own custom rig packages by following these examples.
sample project illustrates how to consume
Principles of rigging
The @rushstack/rig-package defines the "rigging" concept but only provides an API for resolving file paths based on a rig.json config file. Retrofitting rigging onto existing tools requires extra logic beyond this API, and different implementations may be needed for different tools. Heft has already implemented such logic for its official plugins, but if you have projects that use some other toolchain besides Heft, you make them riggable by copying the same approaches as Heft.
Rigging involves three distinct features:
1. Base files for
Many config files provide a facility for inheriting shared settings from another file, which is an easy way to reuse configuration from a rig. For example, in our sample project, the TypeScript configuration is reduced to just a few lines:
"types": ["heft-jest", "node"]
The bulk of the settings come from
tsconfig-base.json in the
default profile. But our local tsconfig.json
file can add custom settings such as
"types" as needed.
The following config files all support a field such as
"extends" that enables settings to be inherited from another NPM package:
- .eslintrc.js for the lint task, provided that you use the @rushstack/eslint-patch workaround or the @rushstack/eslint-config ruleset (which includes the patch)
- config/api-extractor.json for the api-extractor task
- config/jest.config.json for the jest task; Jest conventionally uses the
"preset"field for inheritance however it has some problems, so Heft replaces Jest's config loader with
@rushstack/heft-config-fileengine, and then we use
"preset". In all other respects, this file has the standard Jest format.
- tsconfig.json for the typescript task
require()to load shared settings.
2. Riggable config files
"extends" makes files smaller, it cannot eliminate them entirely. The rig.json file
can completely eliminate most Heft config files. We say that such files are "riggable" config files.
Here's an example from the
// The "rig.json" file directs tools to look for their config files in an external package.
// Documentation for this system: https://www.npmjs.com/package/@rushstack/rig-package
* (Required) The name of the rig package to inherit from.
* It should be an NPM package name with the "-rig" suffix.
* (Optional) Selects a config profile from the rig package. The name must consist of
* lowercase alphanumeric words separated by hyphens, for example "sample-profile".
* If omitted, then the "default" profile will be used."
// "rigProfile": "your-profile-name"
The rig.json file tells Heft that if it doesn't find a file in the heft-node-rig-tutorial/config, it should try looking in the @rushstack/heft-node-rig/profiles/default/common folder instead.
Examples of "riggable" config files:
- <project folder>/config/api-extractor-task.json
- <project folder>/config/heft.json
- <project folder>/config/typescript.json
We cannot eliminate tsconfig.json entirely because tools such as VS Code expect to find this file in the root of your project folder. This is true of a few other files such as .eslintrc.js. On this website, the documentation for each config file specifies whether it is riggable or not.
3. Riggable dependencies
A rig package can also provide NPM dependencies, to avoid having to specify them as
your project. The following tool packages can be provided by the rig (provided they aren't required as
peerDependencies of some other project dependency):
jestand related packages
webpackand its loaders and plugins
Providing dependencies via a rig is optional. Your local project's
devDependencies take precedence over the rig.
Heft resolves each riggable tool independently, using the following procedure:
If the tool package is listed in the
devDependenciesfor the local project, then the tool is resolved from the current project folder. (This step does NOT consider
OTHERWISE, if the current project has a rig.json file, and if the rig's package.json lists the tool in its
dependencies, then the tool is resolved from the rig package folder. (This step does NOT consider
OTHERWISE, the tool is resolved from the current project folder. If it can't be found there, then an error is reported.