Remix ESM module workaround

Important note : not useful anymore for React Flow

React flow can now be imported normally into remix, see xyflow/xyflow#1953 (comment)

The fix can be still useful for other packages

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Run it with npm run dev

Files added

• esm-module.ts stores the dynamic imports of the ESM modules

• app/moduleLoader.tsx exports a wrapper element called ModuleLoader and a hook called useModuleLoader

• app/components/flow.tsx is React Flow first example, modified with useModuleLoader

• app/components/initial-elements.tsx is also from the React Flow example, note that initialEdges have been modified to receive the ReactMarker enum since it can't fetch it itself

Usage

Component using useModuleLoader

const OverviewFlow = () => {

    const {
        default: ReactFlow,
        addEdge,
        MiniMap,
        Controls,
        Background,
        useNodesState,
        useEdgesState,
        MarkerType,
      } = useModuleLoader("react-flow-renderer") as any;
    
    // ...
}

From app/components/flow.tsx

Wrapping

A component using useModuleLoader should be wrapped in a ModuleLoader
The string used as index will be used as the argument for useModuleLoader

<ModuleLoader imports={{ "react-flow-renderer": getReactFlowRenderer }}>
    <Flow />
</ModuleLoader>

From app/routes/index.tsx

Dynamics imports

module.exports = {
    getReactFlowRenderer: async () => await import("react-flow-renderer"),
};

From esm-module.ts

Additionnal information

Types

I did not manage to make the types work so typescript and your IDE will have no informations on the import.

However, you can import types using a regular static import statement without crash, if :

• you are not importing the same type with useModuleLoader
• you are using the imported type only for type checking with typescript

Example in app/components/flow.tsx

import type { ReactFlowInstance, OnConnect, Edge, Node } from "react-flow-renderer";

// ...

const onConnect: OnConnect = (params) =>
    setEdges((eds: Edge[]) => addEdge(params, eds));