TypeScript error

[moffsugita]

(6,23): Could not find a declaration file for module 'fetch-base64'. 
/path/to/node_modules/fetch-base64/index.js' implicitly has an 'any' type.
  Try `npm install @types/fetch-base64` if it exists or add a new declaration (.d.ts) file containing `declare module 'fetch-base64';`

> npm install @types/fetch-base64
npm ERR! code E404
npm ERR! 404 Not Found: @types/fetch-base64@latest

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/ysername/.npm/_logs/2018-12-07T08_33_22_796Z-debug.log