Describe a configuration field

field_spec(
  default = NULL,
  type = NULL,
  nullable = TRUE,
  choices = NULL,
  min = NULL,
  max = NULL,
  validator = NULL
)

Arguments

default: Default value for the field. Use required() for fields that must be explicitly provided and have no sensible default.
type: Character vector. Accepted R types (e.g. "character", "logical").
nullable: Logical. Is NULL a valid value? Defaults to TRUE.
choices: Vector. If provided, the value must belong to this set.
min: Numeric. Minimum allowed value (for numeric types).
max: Numeric. Maximum allowed value (for numeric types).
validator: Function. Custom validation: function(val) returns TRUE if valid, or a character error message otherwise.

A list of class "field_spec"