mermaid/docs/developer-docs/configuration.md

# Configuration

When mermaid starts, configuration is extracted to determine a configuration to be used for a diagram. There are 3 sources for configuration:

* The default configuration
* Overrides at the site level are set by the initialize call, and will be applied to all diagrams in the site/app. The term for this is the **siteConfig**.
* Directives - diagram authors can update select configuration parameters directly in the diagram code via directives. These are applied to the render config.

**The render config** is configuration that is used when rendering by applying these configurations.

## Theme configuration

## Starting mermaid

```mermaid
sequenceDiagram
	Site->>mermaid: initialize
	Site->>mermaid: content loaded
	mermaid->>mermaidAPI: init
```

## Initialize

The initialize call is applied **only once**. It is called by the site integrator in order to override the default configuration at a site level.

## configApi.reset

This method resets the configuration for a diagram to the overall site configuration, which is the configuration provided by the site integrator. Before each rendering of a diagram, reset is called at the very beginning.