validator function crashes if it encounters BigInt

[t-winter]

The validation function throws a TypeError if it encounters a BigInt where it expected something else.

Example: assertEquals<string>(BigInt(1))

This occurs since 0.16.1 and appears to be caused by the incompatibility of JSON.stringify() with the BigInt data type when returning the value that was found where another type was expected.
I'd like to add that JSON.stringify() has other issues (most notably incompatibility with circular references).

I suggest using util.inspect() if available (i.e. when used in a node environment) and JSON.stringify() in a try/catch block if not (and either omit the encountered object or print it directly to the console with console.dir() on errors).

[woutervh-]

Hi @t-winter

Thanks for the detailed report. Indeed JSON.stringify does not seem to be able to handle BigInt types, among other things.

Your suggestion to use util.inspect when possible and wrapping JSON.stringify with a try/catch sounds like a good solution.

I will update this issue when I've published a fix :)

[woutervh-]

Released fix
https://github.com/woutervh-/typescript-is/releases/tag/v0.16.3

Test file
https://github.com/woutervh-/typescript-is/blob/master/test/issue-67.ts