Mobx-state-tree: [TypeScript] Invalid overload type when using `flow()`

[leesiongchan]

const fetch = flow(function *(url: string, options: RequestInit = {}) {
...
});

const create = (url: string, data: {}) => {
  return fetch(url, {
    body: JSON.stringify(data),
    method: 'POST',
  });
};

// [ts] Expected 1 arguments, but got 2.
// const fetch: (a1: string) => Promise<any>

[mattiamanzati]

Unfortunately known TS issue of not having variadic types :/

[jiyinyiyong]

Got similar problem in flow(f) then I use an optional argument, fixed by removing ?...

loadM: flow(function* loadM(forceReload?: boolean) {

    TS2554: Expected 0 arguments, but got 1.

[mweststrate]

Closing until variadic types :'(

[benjick]

Any workaround?

[xaviergonz]

Reopening since now it has a PR

[khomyakov42]

Any workaround?

You can declare "type" for arguments, example:

type Filter = {
   id?: number
   owner?: number
}
function* findOne(filter: Filter) {
   ...
}

[xaviergonz]

Closing, a fix was released with mst 3.9