Parse parses environment variables into v, which must be a pointer to a struct.

ParseWithConfig allows the call to Parse() with custom configurations.

Config is used to control the parsing behavior of the go-envvar package.

ErrorList is list of independent errors raised by Parse.

InvalidArgumentError is raised when an invalid argument passed.

InvalidFieldError is returned by Parse whenever a given struct field is unsupported.

InvalidVariableError is returned when a given env var cannot be parsed to a given struct field.

UnsetVariableError is returned by Parse whenever a required environment variable is not set.

GetenvFn is a custom function to retrieve envvars.