## Representations Refactor — Behaviour-Preserving Structural Improvements
This PR delivers a full refactor of the representations flow, improving structure, readability, and maintainability while preserving all existing behaviour.
The work was completed using a controlled, slice-based approach with strict guardrails and regression validation at each step. No changes have been made to user journeys, payloads, routing, or EN/CY behaviour.
The result is a cleaner, more maintainable codebase with reduced coupling and clearer separation of concerns, ready for future enhancements without increased risk.
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## What Was Done
The refactor was delivered incrementally across the following slices:
- **R1** — Representation entry logic extraction
- **R2** — Page loader separation (SSR/data orchestration)
- **R3** — Journey step resolution extraction
- **R4** — Flow shell decomposition
- **R5** — Representation elements normalisation
- **R6** — Data/service layer cleanup
- **R7** — Summary rendering proof slice
- **R8** — Submission/finalisation boundary isolation
- **R9** — Summary rollout (Batch 1)
Each slice:
- was isolated to a single concern
- followed strict guardrails
- was validated before merge
Full detail is available in:
`context/representations-refactor-tracker.md`
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## Key Improvements
- Reduced coupling across the representations journey
- Separated data loading, orchestration, and rendering concerns
- Simplified complex conditional logic into testable helpers
- Standardised summary rendering using shared primitives (`SummaryCard`, `SummaryRow`)
- Isolated submission/finalisation sequencing into explicit boundaries
- Improved overall readability and maintainability
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## Behaviour Preservation
This refactor does **not** change:
- User journeys (APP / IP / Agent / LPA)
- Route and query behaviour
- Payload contracts and API interactions
- Redux state shape and usage
- Validation rules and messaging
- EN/CY behaviour
- File upload / PDF / email sequencing
- Linked-case logic
All changes are structural only.
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## Validation
### Automated
- `npm run lint` — passed (warnings only, no new errors)
- `npm run test:reps` — passed (7/7)
### Manual
Validated end-to-end across:
- APP
- IP
- Agent
- LPA
Including:
- representation creation
- editing/resuming representations
- submission flow
- confirmation/completion behaviour
- summary rendering across case types
- EN/CY parity
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## Risk Management
The refactor targeted several high-risk areas:
- Case summary entry logic
- Representation submission/finalisation sequencing
- Dual-mode entry (new vs existing representation)
Risk was controlled through:
- small, incremental slices
- one branch per slice
- regression validation per slice
- strict behaviour-preservation guardrails
- controlled rollout for summary rendering changes
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## Reviewer Guidance
Suggested areas to focus on:
- End-to-end representation journey (create → submit → complete)
- S...
Robert Bond