src/rule/type.js
function type(rule, value, source, errors, options) {
  if (rule.required && value === undefined) {
    required(rule, value, source, errors, options);
    return;
  }
  const custom = ['integer', 'float', 'array', 'regexp', 'object',
    'method', 'email', 'number', 'date', 'url', 'hex'];
  const ruleType = rule.type;
  if (custom.indexOf(ruleType) > -1) {
    if (!types[ruleType](value)) {
      errors.push(util.format(options.messages.types[ruleType], rule.fullField, rule.type));
    }
    // straight typeof check
  } else if (ruleType && typeof (value) !== rule.type) {
    errors.push(util.format(options.messages.types[ruleType], rule.fullField, rule.type));
  }
}
function type(rule, value, source, errors, options) {
  if (rule.required && value === undefined) {
    required(rule, value, source, errors, options);
    return;
  }
  const custom = ['integer', 'float', 'array', 'regexp', 'object',
    'method', 'email', 'number', 'date', 'url', 'hex'];
  const ruleType = rule.type;
  if (custom.indexOf(ruleType) > -1) {
    if (!types[ruleType](value)) {
      errors.push(util.format(options.messages.types[ruleType], rule.fullField, rule.type));
    }
    // straight typeof check
  } else if (ruleType && typeof (value) !== rule.type) {
    errors.push(util.format(options.messages.types[ruleType], rule.fullField, rule.type));
  }
}
function type ( rule , value , source , errors , options ) { if ( rule . required && value === undefined ) { required ( rule , value , source , errors , options ) ; return ; } const custom = [ 'integer' , 'float' , 'array' , 'regexp' , 'object' , 'method' , 'email' , 'number' , 'date' , 'url' , 'hex' ] ; const ruleType = rule . type ; if ( custom . indexOf ( ruleType ) > - 1 ) { if ( ! types [ ruleType ] ( value ) ) { errors . push ( util . format ( options . messages . types [ ruleType ] , rule . fullField , rule . type ) ) ; } // straight typeof check } else if ( ruleType && typeof ( value ) !== rule . type ) { errors . push ( util . format ( options . messages . types [ ruleType ] , rule . fullField , rule . type ) ) ; } }
Rule for validating the type of a value.

@param rule The validation rule.
@param value The value of the field on the source object.
@param source The source object being validated.
@param errors An array of errors that this rule may add
validation errors to.
@param options The validation options.
@param options.messages The validation messages.
Rule for validating the type of a value .