Function buildMatchFn

pkgs/core/src/locale/_lib/buildMatchFn/index.ts:66–109

(
  args: BuildMatchFnArgs<Value, DefaultMatchWidth, DefaultParseWidth>,
)

            : never;

export function buildMatchFn<
  Value extends LocaleUnitValue,
  DefaultMatchWidth extends LocaleWidth,
  DefaultParseWidth extends LocaleWidth,
>(
  args: BuildMatchFnArgs<Value, DefaultMatchWidth, DefaultParseWidth>,
): MatchFn<Value> {
  return (string, options = {}) => {
    const width = options.width;

    const matchPattern =
      (width && args.matchPatterns[width]) ||
      args.matchPatterns[args.defaultMatchWidth];
    const matchResult = string.match(matchPattern);

    if (!matchResult) {
      return null;
    }
    const matchedString = matchResult[0];

    const parsePatterns =
      (width && args.parsePatterns[width]) ||
      args.parsePatterns[args.defaultParseWidth];

    const key = (
      Array.isArray(parsePatterns)
        ? findIndex(parsePatterns, (pattern) => pattern.test(matchedString))
        : class="cm">// [TODO] -- I challenge you to fix the type
          findKey(parsePatterns, (pattern: any) => pattern.test(matchedString))
    ) as Value extends LocaleDayPeriod ? string : number;

    let value: Value;

    value = (args.valueCallback ? args.valueCallback(key) : key) as Value;
    value = options.valueCallback
      ? class="cm">// [TODO] -- I challenge you to fix the type
        options.valueCallback(value as any)
      : value;

    const rest = string.slice(matchedString.length);

    return { value, rest };
  };
}

function findKey<Value, Obj extends { [key in string | number]: Value }>(
  object: Obj,