Typescript error: Type 'string' is not assignable to type '"has_many"'

[benjick]

Hello!

I'm just getting started with WatermelonDB+typescript, and I'm running into some problems; I wonder if I need to configure my tsconfig differently?

model/Thing.ts:

import { Model } from "@nozbe/watermelondb";

export class Thing extends Model {
  static table = "things";
  static associations = {
    todos: { type: "has_many", foreignKey: "thing_id" },
  };
}

tsconfig.json:

{
  "compilerOptions": {
    "target": "es5",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": ["src", "model"]
}

This is the error I'm getting:

Class static side 'typeof Thing' incorrectly extends base class static side 'typeof Model'.
  Types of property 'associations' are incompatible.
    Type '{ todos: { type: string; foreignKey: string; }; }' is not assignable to type 'Associations'.
      Property 'todos' is incompatible with index signature.
        Type '{ type: string; foreignKey: string; }' is not assignable to type 'AssociationInfo'.
          Type '{ type: string; foreignKey: string; }' is not assignable to type 'HasManyAssociation'.
            Types of property 'type' are incompatible.
              Type 'string' is not assignable to type '"has_many"'.ts(2417)

Cheers

[KrisLau]

I don't use Typescript so I can't really help but there's an example here that might help
https://github.com/Nozbe/WatermelonDB/blob/master/examples/typescript/ts-example.ts

[scarlac]

Yeah, you need to define the type of associations, such that it reads:

static associations: Associations = { /* ... */ }