rollup-plugin-peer-deps-external/src/get-modules-matcher.js

Rollup plugin to automatically add a library's peerDependencies to its bundle's external config.

/**
 * Creates a test function from a list of module names. The resulting function
 * accepts a string id and returns whether it matches a module in the list.
 *
 * The string id can be a module name (e.g. `lodash`) or a
 * "module path" (e.g. `lodash/map`).
 *
 * @param {Array} modulesNames Array of module names to match against.
 * @returns {function(String): (boolean)} Predicate function accepting a string id.
 */
export default function getModulesMatcher(modulesNames) {
  const regexps = modulesNames.map(moduleRegExp);
  return id => regexps.some(regexp => regexp.test(id));
}

const moduleRegExp = module => new RegExp(`^${module}(\\/\.+)*$`);