Overview

The project has prettier installed with a .prettierrc and a format script, but it isn't enforced in CI - so the Runtime source has drifted out of format over time. Swift formatting is already enforced via the format CI job; this does the same for the TypeScript side.

Two changes:

1. Simplify find-global.ts

find-global.ts has a cascade of fallbacks (globalThis -> window -> global -> self) that hasn't been touched since 2022. globalThis is available in all environments the project targets (Node 12+, all modern browsers), so the window/global/self fallbacks are dead code.

Before:

export let globalVariable: any;
if (typeof globalThis !== "undefined") {
    globalVariable = globalThis;
} else if (typeof window !== "undefined") {
    globalVariable = window;
} else if (typeof global !== "undefined") {
    globalVariable = global;
} else if (typeof self !== "undefined") {
    globalVariable = self;
}

After:

export const globalVariable: any = globalThis;

2. Apply prettier formatting, add CI check

Runs npm run format (which already existed) to bring files into compliance, then adds a prettier CI job that runs npx prettier --check Runtime/src - same pattern as the existing Swift format CI job.

Split into two commits so the formatting noise is separate from the code change.