Interface Rule

Takes in a path and returns an object with a symbol.

When the validation lib sees this symbol, it will use the provided path to get a value from the current field's parent and use that value as the input to the Rule.

The path that's given is forwarded to lodash/get

fields: [
// ...
  {
    // ...
    name: 'highestTemperature',
    type: 'number',
    validation: (Rule) => Rule.positive().min(Rule.valueOfField('lowestTemperature')),
    // ...
  },
]
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