Web3.js: Typescript compilation error regarding a bignumber.js import

[dapplion]

Expected behavior

Build web3 with typescript without errors

Actual behavior

node_modules/web3-core/types/index.d.ts(31,23): error TS2307: Cannot find module 'bignumber.js'.
node_modules/web3-eth/types/index.d.ts(51,25): error TS2307: Cannot find module 'bignumber.js'.

see this Github Action to reproduce, logs, and configuration
https://github.com/dapplion/web3-tsc-test/runs/461815145

[cgewecke]

@dapplion Thanks for reporting. Have opened #3390 to resolve this.

An interim fix is to install bignumber.js as a dependency in your project.

[dapplion]

Thanks for pushing a fix fast. Adding bignumber.js as a direct dependency also fixed the problem in my case.

[holgerd77]

Fixed by #3390

[cgewecke]

Re-opening for visibility until 1.2.7 is published.