Function transform

packages/markmap-lib/test/index.test.ts:159–173

(transformHooks)

    {
      name: 'target-blank',
      transform(transformHooks) {
        transformHooks.parser.tap((md) => {
          md.renderer.renderAttrs = wrapFunction(
            md.renderer.renderAttrs,
            (renderAttrs, token) => {
              let attrs = renderAttrs(token);
              if (token.type === 'link_open') {
                attrs += ' target="_blank"';
              }
              return attrs;
            },
          );
        });
        return {};
      },
    },
  ]);
  const result = transformer.transform(`\