Nimblesite/typeDiagram

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typeDiagram is a tiny, language-neutral DSL for diagramming data types. Write type, union, alias — get a beautiful, auto-laid-out SVG. No drag, no drop, no proprietary format.

Stars: 63
Forks: 4
Open beginner issues: 0
Indexed issues: 20

Dominant language: TypeScript
License: MIT
Last GitHub push: Jul 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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20 open issues indexed

--to rust output is not compilable in a lint-clean crate: no derives, camelCase fields Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/typeDiagram#71 · Opened Aug 12, 2026
[BLOCKER] No Dart tdbin codec generator or runtime — `--to dart` emits ADTs with no serialization at all Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#68 · Opened Jul 27, 2026
[EPIC] tdbin adoption blockers for a real multi-language consumer (Rust + TypeScript + Kotlin) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

Nimblesite/typeDiagram#66 · Opened Jul 23, 2026
`--config` cannot emit tdbin outputs — codecs go stale under `--watch` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#65 · Opened Jul 23, 2026
tdbin `encode`/`decode` ignore generation config — codecs don't compile against configured field types Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

Nimblesite/typeDiagram#64 · Opened Jul 23, 2026
Add Kotlin/JVM target (`--to kotlin`) + Kotlin tdbin runtime — the JVM is the only major ecosystem missing Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

Nimblesite/typeDiagram#63 · Opened Jul 23, 2026
TypeScript tdbin codec: no CLI command, no `List<T>`, no scalar `Option<T>`, `number` not `bigint` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#62 · Opened Jul 23, 2026
[BLOCKER] tdbin rejects struct-form union variants — `verify` fails on the first union in a real schema Open

CRITICAL

Difficulty 4/5 3-5 days Newbie friendliness 55/100

Nimblesite/typeDiagram#61 · Opened Jul 23, 2026
[BLOCKER] Publish the `tdbin` Rust runtime crate — generated codecs reference a crate that exists nowhere Open

CRITICAL

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#60 · Opened Jul 23, 2026
Critical: user-supplied code TEMPLATE for emitted ADTs (readonly, null/undefined, comments, serde) Open

CRITICAL javascript

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#51 · Opened Jun 19, 2026
TypeScript emitter: Option<T> hardcoded to `| undefined`, fields mutable, comments dropped — no config Open

bug javascript

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Nimblesite/typeDiagram#50 · Opened Jun 19, 2026
Generated output: provenance header (source SHA + version) + built-in --check + deterministic ordering Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

Nimblesite/typeDiagram#41 · Opened Jun 11, 2026
[CRITICAL] Payload-carrying unions are lossy: --to csharp drops variant data (collapses to flat enum) Open

CRITICAL

Difficulty 5/5 Over a week Newbie friendliness 45/100

Nimblesite/typeDiagram#40 · Opened Jun 11, 2026
[CRITICAL] Express field metadata (constraints, defaults, descriptions, aliases, config) so generated DTOs need zero hand-maintenance Open

CRITICAL

Difficulty 5/5 Over a week Newbie friendliness 25/100

Nimblesite/typeDiagram#39 · Opened Jun 11, 2026
Add F# code generation backend (--to fsharp) for record + union ADTs Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

Nimblesite/typeDiagram#36 · Opened Jun 3, 2026
0.8.0: --to csharp emits 'public sealed record X(params);' breaking downstream post-processors Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/typeDiagram#35 · Opened May 10, 2026
PDF export fails Open

bug showstopper

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Nimblesite/typeDiagram#33 · Opened May 6, 2026
Pin enum memory representation: @repr(i32) for FFI / wire-stable enums Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#30 · Opened May 2, 2026
Distinguish 'optional, omit when absent' from 'present-but-null' on Option<T> fields Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/typeDiagram#29 · Opened May 2, 2026
Add 'Any' / 'Json' field type for opaque payloads Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

Nimblesite/typeDiagram#28 · Opened May 2, 2026

Nimblesite/typeDiagram

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