fix(sandbox): Fix broken scripts on sandbox build

[spuppo-mux]

When running pnpm run build the following was failing

1. On Sandbox: Unknown file extension ".ts"

   • vite.config.ts was doing a runtime await import(pathToFileURL('scripts/shared.ts')), which bypassed esbuild and was used Node's native loader. Switched to a static import { mirrorTemplatesToSrc } from './scripts/shared' (bundled/transpiled with the config).

2. On Site: DurationFormat is not a constructor
Intl.DurationFormat exists in Node 24 but not Node 22:

   • Added a fallback to format.ts: getDurationFormatter now falls back when Intl.DurationFormat is absent. Gated the two Intl-delegation tests with it.runIf and added a fallback-path test.
   • Per site/src/content/docs/concepts/browser-support.mdx:25:

   When we use a platform feature that hasn't landed in all supported browsers yet, we provide a fallback. The player works either way; the experience may differ slightly in older browsers. For example, tooltips and popovers use CSS anchor positioning where available and fall back to absolute positioning where it isn't.

This PR also includes a node version upgrade in .node-version and .npmrc, as well as switching the node-version to use node-version-file in two github workflows (as done in the rest of the workflows)

Open question (resolved):

Node version mismatch:
- 22.19.0: .node-version (read by fnm/asdf/nodenv/volta), .npmrc, .node-version, and package.json engines >=22.19.0.
- 24.14.0: .nvmrc (nvm only), plus most CI jobs via node-version-file.

Resolved: We resolved to upgrade node version to 24.14.0.

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Note

Medium Risk
Time-display fallback changes user-visible strings on older runtimes; Node 24 bump affects all contributors and CI. Sandbox build path change is localized but on the critical build pipeline.

Overview
Fixes pnpm run build failures from sandbox Vite config loading and site builds on Node without Intl.DurationFormat, and aligns local/CI Node to 24.14.0.

Sandbox: vite.config.ts no longer runtime-imports scripts/shared.ts via pathToFileURL (which triggered Node’s native .ts loader). It now statically imports mirrorTemplatesToSrc from ./scripts/shared so the config is bundled/transpiled with the rest of the Vite setup.

Time formatting: getDurationFormatter in packages/utils/src/time/format.ts treats Intl.DurationFormat as optional. When it’s missing (e.g. Node < 23 during SSR/prerender), it uses createFallbackFormatter: exact digital H:MM:SS output and English comma-separated phrases for localized styles. Tests gate Intl-specific cases with it.runIf / it.skipIf and add loadWithFallback() coverage for the fallback path.

Node version: .node-version and .npmrc move from 22.19.0 to 24.14.0 (matching .nvmrc). bundle-size.yml and website-tests.yml switch setup-node from hardcoded node-version: 22 to node-version-file: '.nvmrc'.

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[sampotts]

As per Slack, let's normalize to 24.18.0 (latest 24 which is LTS) and perhaps add a test for the fallback.

[spuppo-mux]

@mihar-22 double checking with you if these were hardcoded to 22 on purpose or if these changes are ok

[spuppo-mux]

note: only places I didn't update node was package.json > engines.node assuming we still want to support lower node versions and the corresponding mention in CONTRIBUTING.md.

question: Related to the previous note, should I also update @types/node version in devDependencies to ^22 | ^24?

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Project	Deployment	Actions	Updated (UTC)
v10-sandbox	Ready	Preview, Comment	Jul 24, 2026 9:45pm