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isMapConstraint()

isMapConstraint<K, V>(schema): schema is MapConstraint<K, V>

Type guard for MapConstraint. Checks that the schema is a map type and has constraint methods.

Type Parameters​

K: K extends GenericSchema​

V: V extends GenericSchema​

Parameters​

schema: GenericSchema​

The schema to check

Returns: schema is MapConstraint<K, V>​

True if the schema is a MapConstraint with constraint methods

Since​

2.0.0

Example​

const schema = map(string(), number()).minSize(1);
if (isMapConstraint(schema)) {
  // schema is narrowed to MapConstraint
  schema.maxSize(10); // constraint methods available
}