youtube-music/src/utils/trusted-types.ts

import type { TrustedTypePolicy } from 'trusted-types/lib';

export let defaultTrustedTypePolicy: Pick<
  TrustedTypePolicy<{
    createHTML: (input: string) => string;
    createScriptURL: (input: string) => string;
    createScript: (input: string) => string;
  }>,
  'name' | 'createHTML' | 'createScript' | 'createScriptURL'
>;

export const registerWindowDefaultTrustedTypePolicy = () => {
  if (window.trustedTypes && window.trustedTypes.createPolicy) {
    defaultTrustedTypePolicy = window.trustedTypes.createPolicy('default', {
      createHTML: (input) => input,
      createScriptURL: (input) => input,
      createScript: (input) => input,
    });
  }
};