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Troubleshooting

Class-transformer with MobX

Since observable arrays in MobX v4 do not support Array.isArray, serializing an observable entity with an array inside using class-transformer does not work. Prefered solution is to use MobX v6, however, until it is fully implemented in Frui.ts, there is a simple monkey patch:

// put this into the root index.ts
// import {isObservableArray } from "mobx";
const originalIsArray = Array.isArray;
Array.isArray = function (arg: any): arg is any[] {
  return originalIsArray(arg) || isObservableArray(arg);
};

Child VM is not displayed

Check that you have a <View> control that should actually display the child. This control should be probably located in the parent VM's view.

There is an error saying something about "binding" or "inject"

Make sure that you have regenerated the DI-related code (yarn generate).

Weird build error: /@types/react/index.d.ts:3140:13 - error TS2717: Subsequent property declarations must have the same type. Property 'view' must be of type 'SVGProps', but here has type 'SVGProps'...

  • There is probably a mismatch between versions of @types packages (@types/react in the example).
  • If there is a node_modules folder up in the folders hierarchy, make sure that the same version of the respective package is installed in all parent node_modules.
  • Check yarn.lock for multiple versions of the package (look for @types/react@ text). You will need to unify the referenced versions either manually, or you can try npx yarn-deduplicate yarn.lock

Runtime Warning: Cannot update a component (Observer) while rendering a different component (Observer)...otherProps

You are probably binding a two-way control to an entity that is NOT observable. The current version of Frui.ts tries to create the observable target property for you. Since this happens during a view render, you get the weird warning.