Fix type issues with lower TS versions

src/types.ts

@@ -21,18 +21,20 @@ export type Selector<
  // The result will be inferred
  Result = unknown,
  // There are either 0 params, or N params
- Params extends readonly any[] = any[]
+ Params extends never | readonly any[] = any[]
  // If there are 0 params, type the function as just State in, Result out.
  // Otherwise, type it as State + Params in, Result out.
-> =
- /**
- * A function that takes a state and returns data that is based on that state.
- *
- * @param state - The first argument, often a Redux root state object.
- * @param params - All additional arguments passed into the selector.
- * @returns A derived value from the state.
- */
- (state: State, ...params: FallbackIfNever<Params, []>) => Result
+> = [Params] extends [never]
+ ? (state: State) => Result
+ : (state: State, ...params: Params) => Result
+// /**
+// * A function that takes a state and returns data that is based on that state.
+// *
+// * @param state - The first argument, often a Redux root state object.
+// * @param params - All additional arguments passed into the selector.
+// * @returns A derived value from the state.
+// */
+// (state: State, ...params: FallbackIfNever<Params, []>) => Result
 
 /**
  * A function that takes input selectors' return values as arguments and returns a result. Otherwise known as `resultFunc`.
@@ -64,8 +66,8 @@ export type Combiner<InputSelectors extends SelectorArray, Result> =
  * @template ArgsMemoizeFunction - The type of the optional memoize function that is used to memoize the arguments passed into the output selector generated by `createSelector` (e.g., `defaultMemoize` or `weakMapMemoize`). If none is explicitly provided, `defaultMemoize` will be used.
  */
 export interface OutputSelectorFields<
- InputSelectors extends SelectorArray = SelectorArray,
- Result = unknown,
+ InputSelectors extends SelectorArray,
+ Result,
  MemoizeFunction extends UnknownMemoizer = typeof defaultMemoize,
  ArgsMemoizeFunction extends UnknownMemoizer = typeof defaultMemoize
 > extends Required<
@@ -98,17 +100,22 @@ export interface OutputSelectorFields<
  * @template ArgsMemoizeFunction - The type of the optional memoize function that is used to memoize the arguments passed into the output selector generated by `createSelector` (e.g., `defaultMemoize` or `weakMapMemoize`). If none is explicitly provided, `defaultMemoize` will be used.
  */
 export type OutputSelector<
- InputSelectors extends SelectorArray = SelectorArray,
- Result = unknown,
+ InputSelectors extends SelectorArray,
+ Result,
  MemoizeFunction extends UnknownMemoizer = typeof defaultMemoize,
  ArgsMemoizeFunction extends UnknownMemoizer = typeof defaultMemoize
-> = PrepareOutputSelector<
- InputSelectors,
+> = Selector<
+ GetStateFromSelectors<InputSelectors>,
  Result,
- MemoizeFunction,
- ArgsMemoizeFunction
+ GetParamsFromSelectors<InputSelectors>
 > &
- ExtractMemoizerFields<ArgsMemoizeFunction>
+ ExtractMemoizerFields<ArgsMemoizeFunction> &
+ OutputSelectorFields<
+ InputSelectors,
+ Result,
+ MemoizeFunction,
+ ArgsMemoizeFunction
+ >
 
 /**
  * A helper type designed to optimize TypeScript performance by composing parts of {@linkcode OutputSelector | OutputSelector} in a more statically structured manner.
@@ -130,22 +137,22 @@ export type OutputSelector<
  *
  * @see {@link https://github.com/microsoft/TypeScript/wiki/Performance#preferring-interfaces-over-intersections | Reference}
  */
-export interface PrepareOutputSelector<
- InputSelectors extends SelectorArray = SelectorArray,
- Result = unknown,
- MemoizeFunction extends UnknownMemoizer = typeof defaultMemoize,
- ArgsMemoizeFunction extends UnknownMemoizer = typeof defaultMemoize
-> extends OutputSelectorFields<
- InputSelectors,
- Result,
- MemoizeFunction,
- ArgsMemoizeFunction
- >,
- Selector<
- GetStateFromSelectors<InputSelectors>,
- Result,
- GetParamsFromSelectors<InputSelectors>
- > {}
+// export interface PrepareOutputSelector<
+//  InputSelectors extends SelectorArray = SelectorArray,
+//  Result = unknown,
+//  MemoizeFunction extends UnknownMemoizer = typeof defaultMemoize,
+//  ArgsMemoizeFunction extends UnknownMemoizer = typeof defaultMemoize
+// > extends OutputSelectorFields<
+//  InputSelectors,
+//  Result,
+//  MemoizeFunction,
+//  ArgsMemoizeFunction
+//  >,
+//  Selector<
+//  GetStateFromSelectors<InputSelectors>,
+//  Result,
+//  GetParamsFromSelectors<InputSelectors>
+//  > {}
 
 /**
  * A selector that is assumed to have one additional argument, such as