Rheo is a CLI that produces PDF, HTML, and EPUB simultaneously from a directory of Typst source documents. The directory that contains your Typst is called the project directory, and you can compile it like so:

rheo compile path/to/projectdirectory

In general, there are two ways to configure Rheo:

1. By passing flags directly to the CLI command.
2. By specifying configuration in a rheo.toml file at the root of the project directory.

If you compile a Rheo project directory without a rheo.toml file, the following default settings will be applied to compile your project.

version = "0.1.0"
content_dir = "./"
build_dir = "build"
formats = ["pdf", "html", "epub"]

[epub.spine]
vertebrae = ["**/*.typ"]
title = "[project directory name]"

To point Rheo to a rheo.toml file that is not at the root of the project directory, specify it directly via the CLI:

rheo compile path/to/project --config path/to/config