@spec auth_token() :: String.t() | nil

Read the auth token.

Priority: NPM_TOKEN env var > project .npmrc > home .npmrc.

@spec get(map(), String.t(), term()) :: term()

Gets a config value with fallback to defaults.

@spec load(String.t()) :: map()

Loads config from all levels: project .npmrc then user .npmrc. Project values override user values.

@spec merge([map()]) :: map()

Merges multiple config maps (later overrides earlier).

@spec parse_npmrc(String.t()) :: %{required(String.t()) => String.t()}

Parse an .npmrc file into a map of key-value pairs.

@spec read_npmrc_value(String.t()) :: String.t() | nil

Read a value from .npmrc files.

Checks project-level first, then home-level.

@spec registry() :: String.t()

Read the effective registry URL.

Priority: NPM_REGISTRY env var > project .npmrc > home .npmrc > default.

@spec scoped_registry(map(), String.t()) :: String.t()

Returns the registry URL for a given scope, or the default.