Typed dialogs for inputs, forms and schemas you can trust
3,818 Tests | 6 Backends | 4 LLM ProvidersCreate Type-Safe Interactive Dialogs
Declarative forms with Nickel/TOML definitions, 6 backends (CLI, TUI, Web, AI, Agent, Prov-Gen), and type-safe validation. From interactive prompts to infrastructure generation. One schema. Every surface.
What TypeDialog Solves
Per-Backend Code
One Nickel or TOML definition drives CLI, TUI, Web, and AI. No per-backend form code. The schema is the single source of truth.
Fail-Open Validation
Nickel contracts validate every predicate at load time. Unknown predicates cause hard failures, not silent passes. No parallel Rust reimplementation.
Hidden I/O in Execution
Fragment loading happens once at load_form(). The three-phase executor is pure — no filesystem access, no side effects during user interaction.
Manual IaC Assembly
Interactive forms generate validated infrastructure configurations for 6 cloud providers. 7-layer validation pipeline from forms to final JSON.
How It Works
Declarative Forms
Define forms in Nickel (.ncl) or TOML (.toml). Nickel provides contracts, imports, and type-safe composition. TOML provides zero-dependency simplicity. Both produce identical FormDefinition structs.
Three-Phase Execution
Phase 1: Execute selector fields that control conditionals. Phase 2: Build element list (pure, no I/O). Phase 3: Dispatch to backend with when/when_false evaluation. Complete or field-by-field rendering modes.
BackendFactory
Compile-time feature gates eliminate dead backend code. Runtime BackendType match dispatches to the selected backend. Auto-detection via TYPEDIALOG_BACKEND env var with CLI fallback.
AI & Agent Backends
AI backend with RAG, embeddings, and semantic search. Agent backend executes .agent.mdx files with multi-LLM support (Claude, OpenAI, Gemini, Ollama). Template variables, file imports, streaming output.
Infrastructure Generation
Prov-Gen transforms form answers into IaC configurations. 6 cloud providers (AWS, GCP, Azure, Hetzner, UpCloud, LXD). 7-layer validation pipeline from forms to final JSON.
Nickel Roundtrip
Read .ncl schemas, collect user input via any backend, generate validated .ncl output preserving contracts. ContractParser extracts validators. TemplateRenderer preserves formatting.
Architecture
