transformer: 2n ** 32n gets transformed into runtime error Math.pow(2n, 32n)

[Boshen]

I think we need to bail in this case :-/

tsc and esbuild throws "BigInt literals are not available when targeting lower than ES2020."

[overlookmotel]

Background on why it's not feasible to support BigInt with a polyfill: evanw/esbuild#732

It looks like we should bail on any BigInt literal, not just when used with **.

Side note: Math.pow with any BigInt values is a runtime error, they don't have to be big numbers. e.g. Math.pow(1n, 1n) is a runtime error.