Difficulty encountered when using `require('bignumber.js')` in Truffle test, despite successful installation as shown by `npm ls -g` (Windows)

While exploring solidity code testing with truffle, I encountered the need to work with BigNumber values returned from or sent to contracts and decided to include the appropriate library. My current test consists of just one line:

let BigNumber = require('bignumber.js');

This test file is named hello_test.js.

When running the command npm ls -g | grep bignumber, it confirms that 

+-- <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="385a515f564d555a5d4a16524b780f">[email protected]</a>
is installed. However, when trying to execute:

truffle.cmd test .\test\hello_test.js

An error occurs:

Error: Cannot find module 'bignumber.js'

I am puzzled by this issue. Any insights?

Running Truffle version 4.0.6 and npm version 5.6.0

javascriptnpmsoliditytrufflebignumber.js

Answer №1

Here is a breakdown of how node require functions: require('xx') will look for

./node_modules/xx.js
./node_modules/xx/index.js
./node_modules/xx/package.json

If it cannot locate the file, it will then search using the environmental variable, NODE_PATH. If NODE_PATH is not specified, it will not search in any global modules.

Make sure to verify your NODE_PATH.

Answer №2

For some reason, the solution was to locally install the bignumber.js package:

C:\project\> npm install bignumber.js
+ <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="81e3e8e6eff4ece3e4f3afebf2c1b6afb3afb0">[email protected]</a>
added 1 package and moved 1 package in 4.222s

C:\project\> truffle.cmd test .\test\hello_test.js

  0 passing (2 ms)

Following this installation, the bignumber.js package can now be found in both npm ls -g and npm ls (when executed from the project's root directory).

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