React Native + Typescript Error: undefined is not an object (evaluating '_mathjs.default.derivative')

[Sheharyar566]

I'm trying to use the package in react native, and as a test i wrote this equation and used derivative, but i'm getting this error:

undefined is not an object (evaluating '_mathjs.default.derivative')

I tried using the library as

import * as math from 'mathjs/lib/browser/math';

but with this, the typings don't work...

Is there a workaround that lets me deal with this issue while being able to use typescript?

[josdejong]

have you tried

import * as math from 'mathjs'

?

[Sheharyar566]

yup... i did... but I get error as undefined is not an object... so, am I stuck with the lib as "mathjs/dist/math"?

It's a totally fresh react native project with typescript

[cshaa]

Hey @Sheharyar566, I am sorry to hear mathjs doesn't work for you. However I'm struggling to reproduce the issue – I've tried creating a prototype in Expo and it works just fine: https://snack.expo.io/BLtpfslkT Have you used different NPM packages with your project (apart from React and React Native), so that we could be sure your bunlder works ok?

[Sheharyar566]

ah yup.... here's my package.json deps

  "dependencies": {
    "mathjs": "^9.4.3",
    "react": "17.0.1",
    "react-native": "0.64.1",
    "react-native-math-view": "^3.9.3",
    "react-native-vector-icons": "^8.1.0"
  },
  "devDependencies": {
    "@babel/core": "^7.12.9",
    "@babel/runtime": "^7.12.5",
    "@react-native-community/eslint-config": "^2.0.0",
    "@types/jest": "^26.0.23",
    "@types/react-native": "^0.64.5",
    "@types/react-native-vector-icons": "^6.4.7",
    "@types/react-test-renderer": "^16.9.2",
    "babel-jest": "^26.6.3",
    "eslint": "^7.14.0",
    "jest": "^26.6.3",
    "metro-react-native-babel-preset": "^0.64.0",
    "react-test-renderer": "17.0.1",
    "typescript": "^3.8.3"
  },

i did try using mathjs in a totally new project too (a few days ago) but it gave error there too...

[ghost]

I'm having the same issue, but with fractions, I tried to rebuild the app with run-android but it didn't work neither.

Did you fix it? If so, do you remember anything useful?

[ghost]

Okay. I solved mine, I don't know if works for you.

I was using import mathjs from 'mathjs'; but seems like just importing thing by thing makes it work. This is import {fraction} from 'mathjs'

I'm not using typescript, tho.

[gwhitney]

Since it seems that a viable solution was found and as this issue is rather old, closing.