TypedEnv

fromEnv :: forall r rl. RowToList r rl => ReadEnv rl () r => Proxy (Record r) -> Object String -> Either (List EnvError) (Record r)

Gets a record of environment variables from a Node environment.

printEnvError :: List EnvError -> String

Gets the error message for a given EnvError value.

data EnvError

An error that can occur while reading an environment variable

Constructors

• EnvLookupError String
• EnvParseError String

Instances

• Eq EnvError
• Generic EnvError _
• Show EnvError

class ParseValue ty  where

Parses a String value to the specified type.

Members

• parseValue :: String -> Maybe ty

Instances

• ParseValue Boolean
• ParseValue Char
• ParseValue Int
• ParseValue Number
• ParseValue String

class ReadValue ty  where

Retrieves and parses an environment variable value.

Members

• readValue :: String -> Object String -> Either EnvError ty

Instances

• (ParseValue a) => ReadValue (Maybe a)
• (ParseValue a) => ReadValue a

class ReadEnv :: RowList Type -> Row Type -> Row Type -> Constraintclass ReadEnv (rl :: RowList Type) (rin :: Row Type) (rout :: Row Type) | rl -> rout where

Transforms a list of environment variable specifications to a record.

Members

• readEnv :: Proxy rl -> Proxy rin -> Object String -> Either (List EnvError) (Builder (Record rin) (Record rout))

Instances

• (IsSymbol name, ReadValue ty, ListToRow tail tailRout, ReadEnv tail rin tailRout, Cons name ty tailRout rout, Lacks name tailRout) => ReadEnv (Cons name ty tail) rin rout
• ReadEnv Nil rout rout