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Add keySelectorCreator option #82

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Jun 22, 2019
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Add keySelectorCreator option #82

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e39d586
Add keySelectorCreator option
toomuchdesign Jun 9, 2019
448be75
Reorganize tests
toomuchdesign Jun 21, 2019
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19 changes: 18 additions & 1 deletion README.md
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Expand Up @@ -368,7 +368,7 @@ A custom function receiving the same arguments as your selectors (and `inputSele

`cacheKey` is **by default a `string` or `number`** but can be anything depending on the chosen cache strategy (see [`cacheObject` option](#optionscacheobject)).

The `keySelector` idea comes from [Lodash's .memoize][lodash-memoize].
The `keySelector` idea comes from [Lodash's .memoize resolver][lodash-memoize].

### options

Expand All @@ -386,6 +386,23 @@ Default: `reselect`'s [`createSelector`][reselect-create-selector]

An optional function describing a [custom version of createSelector][reselect-create-selector-creator].

#### keySelectorCreator

Type: `function`<br />
Default: `undefined`

An optional function with the following signature returning the [`keySelector`](#keyselector) used by the cached selector.

```typescript
export type keySelectorCreator = (selectorInputs: {
inputSelectors: InputSelector[];
resultFunc: ResultFunc;
keySelector: KeySelector;
}) => KeySelector;
```

This allows to dynamically **generate `keySelectors` on runtime** based on provided `inputSelectors`/`resultFunc` and support [**key selectors composition**](https://github.com/toomuchdesign/re-reselect/pull/73).

### re-reselect selector instance

`createCachedSelector` and `createStructuredCachedSelector` return a **selector instance** which extends the API of a **standard reselect selector**.
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