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/**
* Remove duplicates and redundant patterns from an `include` or `exclude` list.
* Otherwise Cloudflare will throw an error on deployment. Plus, it saves more entries.
* E.g. `['/foo/*', '/foo/*', '/foo/bar'] => ['/foo/*']`
* @param patterns a list of `include` or `exclude` patterns
* @returns a deduplicated list of patterns
*/
export function deduplicatePatterns(patterns: string[]) {
const openPatterns: RegExp[] = [];
// A value in the set may only occur once; it is unique in the set's collection.
// ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
return [...new Set(patterns)]
.sort((a, b) => a.length - b.length)
.filter((pattern) => {
if (openPatterns.some((p) => p.test(pattern))) {
return false;
}
if (pattern.endsWith('*')) {
openPatterns.push(new RegExp(`^${pattern.replace(/(\*\/)*\*$/g, '.*')}`));
}
return true;
});
}
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