@narumincho/readonly

https://jsr.io/@narumincho/readonly

TypeScript readonly type

• ReadonlyURL
• ReadonlyURLSearchParams

Example

const url = new URL("https://example.com");
func(url);
console.log(url); // https://example.com/aaa

const func = (url: URL): void => {
  url.pathname = "/aaa";
};

import type { ReadonlyURL } from "jsr:@narumincho/readonly";

const url = new URL("https://example.com");
func(url);
console.log(url);

const func = (url: ReadonlyURL): void => {
  url.pathname = "/aaa"; // Cannot assign to 'pathname' because it is a read-only property.
};

With jsr:@narumincho/readonly, URLs can be guaranteed not to be overwritten