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Use a single RegExp in getModulesMatcher & cache results #9

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Use a single RegExp in getModulesMatcher & cache results #9

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8 changes: 4 additions & 4 deletions src/get-modules-matcher.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import { memoize } from 'ramda';

/**
* 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.
Expand All @@ -9,8 +11,6 @@
* @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 modulesPattern = new RegExp(`^(${modulesNames.join("|")})($|/)`);
return memoize(id => modulesPattern.test(id));
}

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