Extensible Numeric Literals: Stage 1

[hzoo]

Champion: @littledan
Repo: https://github.com/littledan/proposal-extensible-numeric-literals
Slides: https://docs.google.com/presentation/d/13Ej08CCqXGCTF46GabGdzBepWBgU5d70TtPPYFkkZcs/edit#slide=id.p
First presented at the Sept 2017 meeting

Examples

1236536253453n		BigInt (special case)
4525i			Imaginary numbers
235435.461m		IEEE 754-2008 64-bit decimal
300px			CSS Typed OM

[jridgewell]

What is there for us to do here in babel? Parsings fine, but what's the transform?

[hzoo]

Just parsing I believe, same as BigInt? Don't have that transform either and it's not meant to be used for prod babel/babel#6015

[benjamn]

Despite advancing to Stage 1, this proposal is very early-stage, and it didn't meet with overwhelming confidence or enthusiasm in the September TC39 meeting. I can't imagine using this yet, or encouraging anyone else to use it, until it's much more fleshed out.

I'm also reluctant in principle to add new types to the AST for a syntax that is so likely to change. What would that look like, exactly?

[hzoo]

Yeah we can wait, like some of the other ones; either way unlikely to be really supported with Babel anyway like BigInt other than when it's natively supported?

[littledan]

I agree with @benjamn . This is really much less certain than most of the other Stage 1 proposals. I haven't written out any spec text, and the text I was imagining is likely to change significantly from what I was imagining based on committee feedback.