# `Lightning.Config.Bootstrap`
[🔗](https://github.com/OpenFn/lightning/blob/main/lib/lightning/config/bootstrap.ex#L1)

Bootstrap the application environment.

This module is responsible for setting up the application environment based on
the configuration provided by the user.

Usually, config calls are made in the `config/runtime.exs` file. This module
abstracts the runtime configuration into a module that can be tested and
called from other places (aside from `config/runtime.exs`) file.

> #### Sourcing envs {: .info}
>
> Internally this module uses `Dotenvy.source/1` to source environment variables
> from the `.env`, `.env.<config_env>`, and `.env.<config_env>.override` files.
> It also sources the system environment variables.
>
> Calling `configure/0` without calling `source_envs/0` or `Dotenvy.source/2`
> first will result in no environment variables being loaded.

Usage:

```elixir
Lightning.Config.Bootstrap.source_envs()
Lightning.Config.Bootstrap.configure()
```

# `configure`

# `get_env`

Retrieve a value nested in the application environment.

It first searches the current process's config dictionary, then falls back to
the application environment.

# `source_envs`

---

*Consult [api-reference.md](api-reference.md) for complete listing*