Function compileBooleanMatcherFromLists

src/utils.js:435–460

(positiveItems, negativeItems)

 * @returns {(val: string) => string} a template function to determine the value at runtime
 */
const compileBooleanMatcherFromLists = (positiveItems, negativeItems) => {
  if (positiveItems.length === 0) {
    return () => "false";
  }

  if (negativeItems.length === 0) {
    return () => "true";
  }

  if (positiveItems.length === 1) {
    return (value) => `${toSimpleString(positiveItems[0])} == ${value}`;
  }

  if (negativeItems.length === 1) {
    return (value) => `${toSimpleString(negativeItems[0])} != ${value}`;
  }

  const positiveRegexp = itemsToRegexp(positiveItems);
  const negativeRegexp = itemsToRegexp(negativeItems);

  if (positiveRegexp.length <= negativeRegexp.length) {
    return (value) => `/^${positiveRegexp}$/.test(${value})`;
  }

  return (value) => `!/^${negativeRegexp}$/.test(${value})`;
};

// TODO simplify in the next major release and use it from webpack
/**