Better typings, No more generic Function type. User's can specify input and output types.

[Dudeonyx]

Over at the redux-starter-kit repo which uses this lib, we are planning to switch to Typescript but the generic Function type selectors selectorator returns break type safety, so I decided to either switch to reselect or help you guys with better typings.

So basically this update allows Users to supply Input & Output type parameters. Even without those it will try to infer the output type from the getComputedValue function.

createSelector<State, Output>

Also overloads were added to handle different parameters,

For selectors taking multiple parameters the Input type can be an array
e.g

createSelector<[string, number, string[], boolean ], number>

will give the selector this type signature

(state_0: string, state_1: number, state_2: string[], state_3: boolean) => number

Examples

import createSelector from "selectorator";
   
interface State {
   foo: {
        bar: string;
    };
    baz: string;
 };
                            // State is input type, string is output type
   const getBarBaz = createSelector<State, string>(["foo.bar", "baz"], (bar, baz) => {
     return `${bar} ${baz}`;
   });
   
    // getBarBaz() has type signature: (state: State) => string;
   
   const getBarBaz2 = createSelector<any, string>(["foo.bar", "baz"], (bar, baz) => {
       return `${bar} ${baz}`;
   });
   
    // getBarBaz2() has type signature: (state: any) => string;
   
   const getBarBaz3 = createSelector(["foo.bar", "baz"], (bar, baz) => {
       return `${bar} ${baz}`;
   });
  
    // getBarBaz3() has type signature: (state: any) => any;
  
     const getBarBaz4 = createSelector(["foo.bar", "baz", { path: 0, argIndex: 2 }], (bar, baz) => {
        return `${bar} ${baz}`;
    });
   
    // getBarBaz4() has type signature: (...state: any[]) => any;
   
   const getBarBazQux5 = createSelector<[State, string[]],string>(["foo.bar", "baz", { path: 0, argIndex: 2 }], (bar, baz) => {
      return `${bar} ${baz}`;
    });
   
    // getBarBaz5() has type signature: (state_0: State, state_1: string[]) => string;
   
    const getStructuredBarBaz = createSelector({
       barBaz: getBarBaz,
    }});  

  // getStructuredBarBaz() has type signature: (state: any) => ({ barBaz: string });
  

[planttheidea]

This is great. I'm pretty new to TypeScript, so the generics were based on my limited knowledge. I'll merge and release this tonight!

[Dudeonyx]

In that case I'll try to update the readme to document these changes

[planttheidea]

Lemme know if you want me to hold off or additional changes to the README or if you're cool with me releasing.

[Dudeonyx]

Done

[planttheidea]

Alright cool. Unfortunately I just got to work so I won't be about to do the release until tonight, but it'll happen soon as I'm home.

[planttheidea]

Alright, this has been released as part of 4.0.2. Hopefully this helps with redux-starter-kit!

[Dudeonyx]

Alright, been really busy for the past few days, it's great that this was merged, let me know if you notice any issues with the typings