Numeric separator support in Typescript

[qraynaud]

When using a numeric separator in a TS file, esbuild fails to compile it with the following error message:

✘ [ERROR] Syntax error "_"

    src/app/commission/commission.integration.ts:125:35:
      125 │                     profitAmount: 0_00,
          ╵                                    ^

1 error

[almeidx]

This doesn't seem to be valid syntax

[qraynaud]

This works on native node, it also works using the ts-node npm package. Reading the tc39 proposal corresponding to numeric separators, nothing seems to disallow a leading 0.
What is not allowed is a separator in 0b, 0B, 0o, 0O, 0x, 0X (eg 0_x52).

[hyrious]

No, the spec says it must starts with non zero digit:
https://262.ecma-international.org/13.0/#prod-DecimalIntegerLiteral

[almeidx]

I don't know about ts-node, but it does not work in chrome or firefox, and inherently doesn't work in node either, since it uses the same engine as chrome

[qraynaud]

Oh you’re right. Misread the spec. Sorry. It’s a difference of implementation in typescript then… Strange.