REslava.ResultFlow — auto-generates Mermaid pipeline diagrams for FluentResults chains

[reslava]

Hey @altmann 👋

I built a source generator called REslava.ResultFlow that auto-generates Mermaid flowchart diagrams from fluent Result chains — and it ships with built-in support for FluentResults out of the box.

Add [ResultFlow] to any FluentResults method:

using FluentResults;
using REslava.ResultFlow;

    [ResultFlow]
    public static Result<string> ProcessCheckout(int userId, int productId) =>
        FindUser(userId)
            .Bind(_ => FindProduct(productId))
            .Bind(p  => BuildOrder(userId, p))
            .Map(o   => $"Order #{o.Id} confirmed — {o.Amount:C}");```

The IDE code action (no build needed) injects the diagram as a comment directly above the method:

/*
```mermaid
flowchart LR
    N0_Bind["Bind<br/>User → Product"]:::transform
    N0_Bind -->|ok| N1_Bind
    N0_Bind -->|fail| F0["Failure"]:::failure
    N1_Bind["Bind<br/>Product → Order"]:::transform
    N1_Bind -->|ok| N2_Map
    N1_Bind -->|fail| F1["Failure"]:::failure
    N2_Map["Map<br/>Order → String"]:::transform
    classDef transform fill:#e3f0e8,color:#2f7a5c
    classDef failure fill:#f8e3e3,color:#b13e3e
```*/
    [ResultFlow]
    public static Result<string> ProcessCheckout(int userId, int productId) =>
        FindUser(userId)
            .Bind(_ => FindProduct(productId))
            .Bind(p  => BuildOrder(userId, p))
            .Map(o   => $"Order #{o.Id} confirmed — {o.Amount:C}");

The diagram lives next to the code, zero runtime overhead, zero maintenance — it regenerates on every click.

For libraries not in the built-in dictionary, a resultflow.json file lets you classify any method names you want.

• NuGet: https://www.nuget.org/packages/REslava.ResultFlow
• Docs: https://reslava.github.io/nuget-package-reslava-result/resultflow/
• GitHub: https://github.com/reslava/nuget-package-reslava-result#3--resultflow--mermaid-diagrams-autogenerated
• Github FluentResults project sample: https://github.com/reslava/nuget-package-reslava-result/tree/main/samples/resultflow-fluentresults;

Just wanted to share — thought it might be useful to FluentResults users!