ES2020 compatibility for GSplatSortBinWeights worker injection

[mvaligursky]

Description

Fixes gsplat sorting not working in release builds when targeting ES2020.

Problem

When SWC transpiles to ES2020, static class fields are moved outside the class body:

// ES2022 (native)
class Foo {
    static BAR = 42;
}

// ES2020 (transpiled)
class Foo {}
Foo.BAR = 42;

Since GSplatSortBinWeights is stringified via .toString() and injected into a web worker, the static properties were lost after transpilation. This caused NUM_BINS and WEIGHT_TIERS to be undefined in the worker, breaking the sorting algorithm.

Solution

Convert static class fields to static getters, which are ES2015 syntax and remain inside the class body when stringified:

// Before
static NUM_BINS = 32;

// After  
static get NUM_BINS() {
    return 32;
}

Testing

• Verified gsplat sorting works correctly with npm run build && npm run serve
• Both WebGL and WebGPU backends affected and fixed