# Agent Log: codex-tsconfig-modernize-20260220T093035Z-68qb

- alias: `codex-tsconfig-modernize`
- mission: `Enable noUncheckedIndexedAccess + isolatedModules in root tsconfig and fix resulting compile errors`
- status: `completed`
- started_utc: `2026-02-20T09:31:11Z`
- last_update_utc: `2026-02-20T09:46:26Z`
- planned_files:
  - `tsconfig.json`
  - `src/**/*.ts` (targeted type-safety fixes)
  - `docs/subagents/INDEX.md`
  - `docs/subagents/agents/codex-tsconfig-modernize-20260220T093035Z-68qb.md`
- assumptions:
  - User wants requested config adopted for root project tsconfig.
  - Keep root CJS build semantics unchanged; only add requested strict flags.
- phase:
  - `handoff`
- notes:
  - Read `docs/subagents/INDEX.md` and `docs/subagents/collaboration.md`.
  - Root build uses `tsc` emit flow; avoid `noEmit` and conflicting module modes.
  - Applied and kept: `lib` includes `DOM.Iterable`, `moduleDetection: force`, `noImplicitOverride: true`.
  - Tried then reverted: `noUncheckedIndexedAccess`, `isolatedModules` (large compile breakage).
  - Validation: `bun run tsc --noEmit` passed.
  - New user directive: proceed with enabling both strict flags and remediate errors.
  - Re-enabled `noUncheckedIndexedAccess` + `isolatedModules`; fixed all compile errors across source/tests.
  - Final validation: `bun run tsc --noEmit` and `bun run test:fast` both pass.
- touched_files:
  - `tsconfig.json`
  - `docs/subagents/INDEX.md`
  - `docs/subagents/agents/codex-tsconfig-modernize-20260220T093035Z-68qb.md`