Are reflection problems a concern when using type-graphql mutations?

Recently, I've been experimenting with integrating type-graphql into my nodejs project. While implementing @Query methods went smoothly, I'm facing challenges with the following code snippet in combination with Moleculer service.

@Mutation()
  // eslint-disable-next-line class-methods-use-this
  removeValue((@Arg("value") value: number): void {
    console.log(value);
  }

The errors I encounter are:

/home/micro-api/node_modules/type-graphql/dist/helpers/findType.js:10
 metadataDesignType = reflectedType[parameterIndex];
                                          ^
/home/micro-api/node_modules/type-graphql/dist/helpers/findType.js:1
TypeError: Cannot read property '0' of undefined

I've come across some comments referencing reflection in my research, but being new to node and typescript, I find myself at a loss. Any insight or suggestions would be greatly appreciated.

typescriptgraphqltypegraphql

Answer №1

It appears that the issue you are encountering is related to mutations (or queries) returning a value or void. For more information, please refer to https://github.com/MichalLytek/type-graphql/issues/318

You can address this by making a simple adjustment:

@Mutation(() => Boolean)  
removeValue((@Arg("value") value: number): boolean {
    console.log(value);
    return true;
}

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