Use @types/guacamole-client.
npm i @types/guacamole-client
# or
yarn add @types/guacamole-clientWork in progress typescript definitions based on http://guacamole.apache.org/doc/guacamole-common-js/
How to install:
npm i guacamole-client-typedefs
# or
yarn add guacamole-client-typedefs
# now add "./node_modules/guacamole-client-typedefs/index.d.ts"
# to the "files" array in tsconfig.json