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isStringConstraint()

isStringConstraint(schema): schema is StringConstraint

Type guard for StringConstraint. Checks that the schema is a string type and has constraint methods.

Parameters​

schema: GenericSchema​

The schema to check

Returns: schema is StringConstraint​

True if the schema is a StringConstraint with constraint methods

Since​

2.0.0

Example​

const schema = string().minLength(5);
if (isStringConstraint(schema)) {
  // schema is narrowed to StringConstraint
  schema.maxLength(10); // constraint methods available
}