Function getMatcher

packages/pluginutils/src/createFilter.ts:29–41

(id: string | RegExp)

  const resolutionBase = options && options.resolve;

  const getMatcher = (id: string | RegExp) =>
    id instanceof RegExp
      ? id
      : {
          test: (what: string) => {
            // this refactor is a tad overly verbose but makes for easy debugging
            const pattern = getMatcherString(id, resolutionBase);
            const fn = pm(pattern, { dot: true });
            const result = fn(what);

            return result;
          }
        };

  const includeMatchers = ensureArray(include).map(getMatcher);
  const excludeMatchers = ensureArray(exclude).map(getMatcher);