eq
$eq
Do a deep equality check between the value and the provided constraint value.
Parameters
value(any, required): The value to compare against using deep equality.
Example
// Ensure a status field can only be 'active'
new Schema('string').validator({$eq: 'active'})
// Ensure an object matches an exact structure
new Schema('object').validator({$eq: {type: 'config', version: 1}})