Typescript build fails

[urmaul]

With megalodon version 8.1.5 in dependencies the typescript build fails with the error:

node_modules/megalodon/lib/src/firefish/web_socket.d.ts:2:23 - error TS2688: Cannot find type definition file for 'ws'.

2 /// <reference types="ws" />
                        ~~

node_modules/megalodon/lib/src/mastodon/web_socket.d.ts:2:23 - error TS2688: Cannot find type definition file for 'ws'.

2 /// <reference types="ws" />
                        ~~

node_modules/megalodon/lib/src/pleroma/web_socket.d.ts:2:23 - error TS2688: Cannot find type definition file for 'ws'.

2 /// <reference types="ws" />
                        ~~