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a0dc166991
Sorry about the thrash in advance! This removes the top level `forget` directory which adds unnecessary nesting to our repo Hopefully everything still works
42 lines
1.1 KiB
TypeScript
42 lines
1.1 KiB
TypeScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*/
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import React from "react";
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/**
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* Replacement to React.createContext.
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*
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* Does not take any default value and avoids non-null assertions when using
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* the value of the context, like the following scenario.
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*
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* ```ts
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* const StoreDispatchContext = useContext<Dispatch<ReducerAction>>(null);
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* const dispatchStore = useContext(StoreDispatchContext);
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* ...
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* dipatchStore!({ ... });
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* ```
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*
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* Instead, it throws an error when `useContext` is not called within a
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* Provider with a value.
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*/
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export default function createContext<T>() {
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const context = React.createContext<T | null>(null);
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function useContext() {
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const c = React.useContext(context);
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if (!c)
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throw new Error("useContext must be within a Provider with a value");
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return c;
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}
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return { useContext, Provider: context.Provider };
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}
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