Could not find a declaration file for module 'browserify-bignum'.

[shuse2]

Expected behavior

External user should be able to build using typescript.

Actual behavior

../lisk-elements/packages/lisk-transactions/dist-node/utils/validation/validation.d.ts:1:20 - error TS7016: Could not find a declaration file for module 'browserify-bignum'. '/Users/shuse2/Documents/10_lisk/lisk-elements/packages/lisk-transactions/node_modules/browserify-bignum/bignumber.js' implicitly has an 'any' type.
  Try `npm install @types/browserify-bignum` if it exists or add a new declaration (.d.ts) file containing `declare module 'browserify-bignum';`

Steps to reproduce

Try to use and build @liskhq/lisk-transactions from TypeScript environment

Which version(s) does this affect? (Environment, OS, etc...)

2.0-