Function _applyTrustedTypesToAttribute

src/purify.ts:2242–2270

(
    lcTag: string,
    lcName: string,
    namespaceURI: string | null,
    value: string
  )

   * @return the value, wrapped when Trusted Types demand it
   */
  const _applyTrustedTypesToAttribute = function (
    lcTag: string,
    lcName: string,
    namespaceURI: string | null,
    value: string
  ): string {
    if (
      trustedTypesPolicy &&
      typeof trustedTypes === 'object' &&
      typeof trustedTypes.getAttributeType === 'function' &&
      !namespaceURI
    ) {
      switch (trustedTypes.getAttributeType(lcTag, lcName)) {
        case 'TrustedHTML': {
          return _createTrustedHTML(value);
        }

        case 'TrustedScriptURL': {
          return _createTrustedScriptURL(value);
        }

        default: {
          break;
        }
      }
    }

    return value;
  };

  /**
   * Write a modified attribute value back onto the element. On