Optional path to .env file.

Set to true to export all .env variables to the current processes environment. Variables are then accessable via Deno.env.get(<key>).

Set to true to ensure that all necessary environment variables are defined after reading from .env. It will read example to get the list of needed variables.

If any of the defined variables is not in .env, an error will occur. This method is preferred because it prevents runtime errors in a production application due to improper configuration. Another way to supply required variables is externally, like so:

GREETING="hello world" deno run --allow-env app.ts

Optional path to .env.example file.

Set to true to allow required env variables to be empty. Otherwise, it will throw an error if any variable is empty.

Path to .env.defaults file which is used to define default values.

# .env.defaults
# Will not be set if GREETING is set in base .env file
GREETING="a secret to everybody"

List of Env variables to read from process. By default, the complete Env is looked up. This allows to permit access to only specific Env variables with --allow-env=ENV_VAR_NAME.