Cannot find module 'fs-extra' when testing with Truffle

user_6630524 0
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I am reading the tutorial on Ethereum Pet Shop -- Your First DApp, everything seems ok until I test with truffle test with below error:

Error: Cannot find module 'fs-extra'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
at Function.Module._load (internal/modules/cjs/loader.js:562:25)
at Module.require (internal/modules/cjs/loader.js:690:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object.call (/Users/.npm-global/lib/node_modules/truffle/node_modules/@truffle/debugger/dist/external "fs-extra":1:18)
at r (/Users/.npm-global/lib/node_modules/truffle/node_modules/@truffle/debugger/dist/webpack/bootstrap:19:22)
[...]
Truffle v5.2.4 (core: 5.2.4)
Node v10.16.0

I have tried some suggestions as in Module is extraneous npm, but the Error: Cannot find module 'fs-extra' insists.

truffle solidity node-modules npm
2 Answers

You need to add it to your package.json and install the package.

  1. Either run

    npm install --save fs-extra

    The --save option will add it to the package.json for you.

  2. Or add it manually to the package.json section dependencies

    "dependencies": {
    "fs-extra": "^9.1.0"
}

    and then install it

    npm install

    Version 9.1.0 is the current version according to npmjs

user_16931920

fs-extra-package should be delivered as part of truffle and I would not recommend installing it to the project.

To fix it on Ubuntu follow these steps:

# stop apps/tools that using truffle - ganache-cli, etc.

# uninstall truffle
sudo npm uninstall -g truffle

# install truffle again
sudo npm install -g truffle

# check that fs-extra packaged installed
ls -lh  /usr/local/lib/node_modules/truffle/node_modules | grep fs-extra
user_3032980
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