Support for BigInt is not available in TypeScript version 3.5.*

It seems that TypeScript has supported BigInt since version 3.2, and my project is using TypeScript 3.5. Despite not explicitly declaring any variables as BigInt, I recently integrated a package called BufferUtility from https://github.com/Pharuxtan/BufferUtility#readme.

However, upon adding this package, my project encountered a compilation error:

node_modules/bufferutility/index.d.ts(37,37): error TS2304: Cannot find name 'BigInt'.

This issue took me by surprise, as my research indicated that it could be a problem for those on TypeScript versions older than 3.2. Am I overlooking something here?

typescriptnpm

Answer №1

Summary:

  1. bigint becomes a valid type in Typescript 3.2.
  2. BigInt is recognized as a type starting in Typescript 3.9.
  3. The bufferutility module employs BigInt within its types.

Conclusion: To utilize bufferutility, you need Typescript version 3.9 or higher.

I couldn't locate the release notes, but it appears that BigInt isn't usable as a type in versions below 3.8.

Check 3.8.3 playground

However, from version 3.9 onwards, it functions as intended.

Explore 3.9.7 Playground

It seems that the typings for BufferUtility rely on BigInt as a type, suggesting a minimum requirement of Typescript 3.9 for compatibility.

Interesting facts about these data types:

declare let a: bigint
declare let b: BigInt

b = a // works fine, bigint can be assigned to BigInt
a = b // Error. Type 'BigInt' is not assignable to type 'bigint'.(2322)

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