variant

type Assignable interface {
	// AssignTo assigns the internal value to a target variable. It is important to
	// pass a pointer to the target variable, not the variable itself.
	// Returns an error when the internal value cannot be assigned to the target
	// because of a type mismatch.
	AssignTo(target any) error
	// AssignToReflectValue assigns the internal value to a reflect value.
	// Returns an error when the internal value cannot be assigned to the target
	// because of a type mismatch.
	AssignToReflectValue(targetVal *reflect.Value) error
	// AssignToString returns the internal value when it is a string.
	// Returns an error when the internal value cannot be assigned to a string
	// because of a type mismatch.
	AssignToString() (string, error)
	// AssignToBool returns the internal value when it is a bool.
	// Returns an error when the internal value cannot be assigned to a bool
	// because of a type mismatch.
	AssignToBool() (bool, error)
	// AssignToBytes returns the internal value when it is a []byte.
	// Returns an error when the internal value cannot be assigned to a byte[]
	// because of a type mismatch.
	AssignToBytes() ([]byte, error)
	// AssignToFloat returns the internal value when it is a float.
	// Returns an error when the internal value cannot be assigned to a float
	// because of a type mismatch.
	AssignToFloat() (float64, error)
	// AssignToInt returns the internal value when it is an int.
	// Returns an error when the internal value cannot be assigned to the target
	// because of a type mismatch.
	AssignToInt() (int, error)
}

type DecodeHookFunc interface{}

type DecodeHookFuncKind func(reflect.Kind, reflect.Kind, interface{}) (interface{}, error)

type DecodeHookFuncType func(reflect.Type, reflect.Type, interface{}) (interface{}, error)

type DecodeHookFuncValue func(from reflect.Value, to reflect.Value) (interface{}, error)

type Decoder struct {
	// contains filtered or unexported fields
}

type DecoderConfig struct {
	// DecodeHook, if set, will be called before any decoding and any
	// type conversion (if WeaklyTypedInput is on). This lets you modify
	// the values before they're set down onto the resulting struct. The
	// DecodeHook is called for every map and value in the input. This means
	// that if a struct has embedded fields with squash tags the decode hook
	// is called only once with all of the input data, not once for each
	// embedded struct.
	//
	// If an error is returned, the entire decode will fail with that error.
	DecodeHook DecodeHookFunc

	// If ErrorUnused is true, then it is an error for there to exist
	// keys in the original map that were unused in the decoding process
	// (extra keys).
	ErrorUnused bool

	// If ErrorUnset is true, then it is an error for there to exist
	// fields in the result that were not set in the decoding process
	// (extra fields). This only applies to decoding to a struct. This
	// will affect all nested structs as well.
	ErrorUnset bool

	// ZeroFields, if set to true, will zero fields before writing them.
	// For example, a map will be emptied before decoded values are put in
	// it. If this is false, a map will be merged.
	ZeroFields bool

	// If WeaklyTypedInput is true, the decoder will make the following
	// "weak" conversions:
	//
	//   - bools to string (true = "1", false = "0")
	//   - numbers to string (base 10)
	//   - bools to int/uint (true = 1, false = 0)
	//   - strings to int/uint (base implied by prefix)
	//   - int to bool (true if value != 0)
	//   - string to bool (accepts: 1, t, T, TRUE, true, True, 0, f, F,
	//     FALSE, false, False. Anything else is an error)
	//   - empty array = empty map and vice versa
	//   - negative numbers to overflowed uint values (base 10)
	//   - slice of maps to a merged map
	//   - single values are converted to slices if required. Each
	//     element is weakly decoded. For example: "4" can become []int{4}
	//     if the target type is an int slice.
	//
	WeaklyTypedInput bool

	// Squash will squash embedded structs.  A squash tag may also be
	// added to an individual struct field using a tag.  For example:
	//
	//  type Parent struct {
	//      Child `mapstructure:",squash"`
	//  }
	Squash bool

	// Metadata is the struct that will contain extra metadata about
	// the decoding. If this is nil, then no metadata will be tracked.
	Metadata *Metadata

	// Result is a pointer to the struct that will contain the decoded
	// value.
	Result interface{}

	// The tag name that mapstructure reads for field names. This
	// defaults to "mapstructure"
	TagName string

	// IgnoreUntaggedFields ignores all struct fields without explicit
	// TagName, comparable to `mapstructure:"-"` as default behaviour.
	IgnoreUntaggedFields bool

	// MatchName is the function used to match the map key to the struct
	// field name or tag. Defaults to `strings.EqualFold`. This can be used
	// to implement case-sensitive tag values, support snake casing, etc.
	MatchName func(mapKey, fieldName string) bool
}

type Error struct {
	Errors []string
}

type Metadata struct {
	// Keys are the keys of the structure which were successfully decoded
	Keys []string

	// Unused is a slice of keys that were found in the raw value but
	// weren't decoded since there was no matching field in the result interface
	Unused []string

	// Unset is a slice of field names that were found in the result interface
	// but weren't set in the decoding process since there was no matching value
	// in the input
	Unset []string
}