Modern Agenda — Phase 03: TypeScript
Rosetta Phase 04 — TypeScript
Typed agenda implementation separating data models, rendering logic, and browser behavior.
Modern Agenda: TypeScript
Introduce static typing without introducing a UI framework, isolating TypeScript's contribution. The visible target remains comparable with every other Modern Agenda phase.
Introduce static typing without introducing a UI framework, isolating TypeScript's contribution. The visible target remains comparable with every other Modern Agenda phase.
Purpose & Learning Objectives
Why this project exists and what the implementation should teach.Purpose
Introduce static typing without introducing a UI framework, isolating TypeScript's contribution.
Learning Objectives
- Model agenda data with interfaces and type aliases.
- Use optional properties, unions, and narrowing where data varies.
- Type rendering and transformation functions.
- Use compiler checks to expose invalid assumptions.
- Compare typed browser architecture with untyped modern JavaScript.
Technology Plan
Current, planned, legacy, or candidate technologies for this project.Phase Implementation
Planned behaviors, architecture decisions, and evidence this project should produce.- Interfaces and aliases.
- Optional values.
- Narrowing for variant structures.
- Typed selectors and events.
- Typed render functions.
- Explicit return values.
- Missing properties.
- Invalid unions.
- Unsafe nullable access.
Rosetta Comparison Notes
Implementation context, boundaries, and later expansion.Series Rule
Keep the data fixture, application behavior, and expected output recognizable.
Comparison Output
Document what this phase changes in syntax, typing, modules, state, rendering, requests, and tooling.