class rune edgecase (rollup different from esbuild)

[JakeBeaver]

Describe the bug

Found a behavior difference beween pnpm dev and pnpm preview, when referencing a state property as a default constructor arg.

I do realise what I did is unorthodox and unnecessary, but it's interesting that esbuild breaks it nonetheless

<script>
    class A {
        a = $state("test");
        constructor(init = /* this causes it to fail: */ this.a){
            this.a = init;
        }
    }

    const a = new A();
</script>

{a.a}

Reproduction

• scaffold a basic sveltekit app

npx sv create

• put this in ./src/routes/+page.svelte

<script>
    class A {
        a = $state("test");
        constructor(init = /* this causes it to fail: */ this.a){
            this.a = init;
        }
    }

    const a = new A();
</script>

{a.a}

• run dev server and observe it works fine

pnpm dev

• run a build and preview, observe browser console error

pnpm build
pnpm preview

Logs

2.DfF_Z-xm.js:1 Uncaught (in promise) TypeError: Cannot read from private field
    at n (2.DfF_Z-xm.js:1:17)
    at c (2.DfF_Z-xm.js:1:56)
    at r (2.DfF_Z-xm.js:1:87)
    at get a (2.DfF_Z-xm.js:1:534)
    at new a (2.DfF_Z-xm.js:1:485)
    at q (2.DfF_Z-xm.js:1:595)
    at app.BtHtryw3.js:2:6003
    at app.BtHtryw3.js:2:1529
    at an (DEKecDdA.js:1:11051)
    at bt (DEKecDdA.js:1:11936)

System Info

System:
    OS: Windows 11 10.0.22631
    CPU: (20) x64 13th Gen Intel(R) Core(TM) i7-13700H
    Memory: 38.06 GB / 63.68 GB
  Binaries:
    Node: 22.11.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.9.0 - C:\Program Files\nodejs\npm.CMD
    pnpm: 9.12.3 - C:\Program Files\nodejs\pnpm.CMD
    bun: 1.2.5 - C:\Program Files\nodejs\bun.CMD
  Browsers:
    Edge: Chromium (127.0.2651.74)
    Internet Explorer: 11.0.22621.3527

Severity

annoyance