Using jsbi in a typescript project with strict mode

Question

I'm working on a typescript library that is using native BigInt s. It works great in chrome, but not in Safari. So I came across the jsbi "polyfill" that takes care of this.

But for some reason, I can't import the library correctly.

I first tried to import it like this:

import JSBI from 'jsbi'

The types are correct, but at runtime JSBI is undefined and I cannot call any methods on it. (eg. TypeError: Cannot read property 'subtract' of undefined )

So I tried doing:

import * as JSBI from 'jsbi'

But then it wouldn't even compile, I get various errors like Cannot use namespace 'JSBI' as a type. . I also tried to access the methods like this JSBI.JSBI.subtract , but then I get the error Property 'JSBI' does not exist on type 'typeof import("/project/node_modules/jsbi/jsbi")'.

The only way I got it working was by using the following import:

import * as JSBI from 'jsbi/dist/jsbi-umd.js'

This actually worked. JSBI is defined at runtime and I can access its methods. However, it only works when strict mode is disabled. When I enable it, i get the error

error TS7016: Could not find a declaration file for module 'jsbi/dist/jsbi-umd.js'.
 '/project/node_modules/jsbi/dist/jsbi-umd.js' implicitly has an 'any' type.
  Try `npm install @types/jsbi` if it exists or add a new declaration (.d.ts) file containing `declare module 'jsbi/dist/jsbi-umd.js';`

I event tried to declare my own.d.ts module as a temporary fix, but it didn't work work either.

Am I missing something here?

Answer 1

JSBI has been migrated to Typescript and includes adts file. This problem should be resolved. https://github.com/GoogleChromeLabs/jsbi/pull/67