Common issues

The problems people run into most often, and what to check first.

The component is not in a Partas.Solid namespace

The plugin only treats types whose full name starts with Partas.Solid as tags and components, so it leaves other code alone. A [<SolidTypeComponent>] declared anywhere else gets a warning and is not transformed, and a custom tag type is not emitted as a JSX tag.

// Works
namespace Partas.Solid.MyApp

// Is not picked up
namespace MyApp

A function child without yield

Components such as For, Repeat, Show.Keyed and Show.NonKeyed take a function as their child. You must yield it:

// Wrong: the function is not passed to For
For.Keyed(each = [| "1"; "2" |]) {
    fun item index -> li () { item }
}

// Right
For.Keyed(each = [| "1"; "2" |]) {
    yield fun item index -> li () { item }
}

If your IDE cannot infer the types of item and index, the yield is probably missing.

Typed arrays

Fable compiles numeric arrays to typed arrays, so [| 1; 2; 3 |] becomes an Int32Array. JavaScript libraries that expect a plain array can fail on it. Compile with --typedArrays false, or box the values. See Installation.

Compiling in Debug

The plugin expects the Release AST. Always pass -c Release to Fable, including under dotnet fable watch.

Children of a <template>

Solid 2's development build rejects any JSX child of <template> with "The HTML provided is malformed", because its template check re-parses the markup and cannot see template contents. Set the content with innerHTML instead.

Nothing updates when a signal changes

A value read in a component body is read once. Read it inside the JSX, or make it a function, to keep it live. See Building the DOM.

Output that is silently missing

If the plugin drops part of a component, compile that component with ComponentFlag.PrintDisposals to log every expression it discards, or ComponentFlag.DebugMode to dump the AST it received:

[<SolidComponent(ComponentFlag.VerboseDebugMode)>]
let Broken () = ...

Include that output when you submit an issue. See attribute flags for the other flags.