thread 'main' panicked at 'failed to determine top-level Id for jsx expression'

[NotWoods]

Platform: windows x86_64
Version: 1.32.0
Args: ["C:\\Users\\tiger\\.deno\\bin\\deno.exe", "run", ".\\src\\generate.ts"]

thread 'main' panicked at 'failed to determine top-level Id for jsx expression', C:\Users\runneradmin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\swc_ecma_transforms_typescript-0.171.4\src\strip.rs:252:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

How to reproduce:

Use a deno.json with the following:

{
  "compilerOptions": {
    "jsxFactory": "h",
    "jsxFragmentFactory": "null"
  }
}

Why u do this?

To use fragments with vhtml, null is used rather than a special helper function. (h(null, {}, ...children))

Using undefined as the jsxFragmentFactory works fine.

[lucacasonato]

Does this work in TSC?

[NotWoods]

I was able to run TSC with this config (and setting jsx to react)

[marvinhagemeister]

Just tried this out with Deno 1.42.4 and the null value is inserted as expected 🎉