Int returns environment variable as int64 and conversion error if any.

MustAppEnv returns new AppEnv or panics if case of any errors.

MustInt returns environment variable and error if it's not set or conversion error if any.

MustStr returns environment variable and error if it's not set.

MustStrSlice returns environment variable split by given separator and errors if it's not set.

NewAppEnv returns new AppEnv value.

Str returns environment variable as string.

StrSlice returns environment variable split by given separator.

EnvBeta is "beta" env.

EnvDev is "dev" env.

EnvProd is "prod" env.

AppEnv implements application environment.