chore: bump prototype tsconfig target and lib to ES2022

[singyichen]

Purpose

Align the prototype TypeScript config with the actual runtime environment so tsc stops rejecting APIs the runtime supports.

Reason

Prototype Playwright tests execute in Chromium and current Node — both support ES2022 — but tsconfig.json pinned target/lib to ES2020. On PR #122 this produced a false negative: Object.hasOwn ran fine at runtime yet failed the "Prototype — Type Check (tsc)" CI job with TS2550. A stale compiler lib protects nothing here; it only creates runtime/typecheck divergence.

Result

design/prototype/tsconfig.json target and lib bumped ES2020 → ES2022 (DOM lib and all other options unchanged). ES2022 APIs such as Object.hasOwn and Array.prototype.at are now accepted by tsc, matching what the runtime already executes.

Changed Files

File	Change
design/prototype/tsconfig.json	target/lib ES2020 → ES2022

Test Plan

• npx tsc --noEmit in design/prototype/ — passes on the existing suite
• No source changes — Playwright behavior unaffected (config only widens accepted syntax)

Notes

Config-only change; no API contracts, no version numbers touched.

Impact Scope

• Frontend
• Admin
• API
• Queue
• Other: design prototype tooling config

Related

#122 (incident that motivated this)

🤖 Generated with Claude Code

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[amazon-q-developer]

Review Summary

This configuration change correctly aligns the TypeScript compiler settings with the ES2022 runtime environment. The update resolves the false negative from PR #122 where ES2022 APIs were rejected by tsc despite being supported at runtime.

Changes Verified:

• ✅ TypeScript target and lib upgraded from ES2020 to ES2022
• ✅ Change is scoped to prototype tooling only
• ✅ No source code modifications required
• ✅ Resolves compiler/runtime divergence

No blocking issues found. The change is ready to merge.

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