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51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
import {
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type Dispatch,
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type SetStateAction,
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useCallback,
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useEffect,
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useState,
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} from 'react'
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import _ from 'lodash'
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import { useIdeContext } from '../context/ide-context'
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/**
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* Binds a property in an Angular scope making it accessible in a React
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* component. The interface is compatible with React.useState(), including
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* the option of passing a function to the setter.
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*
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* The generic type is not an actual guarantee because the value for a path is
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* returned as undefined when there is nothing in the scope store for that path.
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*/
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export default function useScopeValue<T = any>(
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path: string, // dot '.' path of a property in the Angular scope
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deep = false
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): [T, Dispatch<SetStateAction<T>>] {
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const { scopeStore } = useIdeContext()
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const [value, setValue] = useState<T>(() => scopeStore.get(path))
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useEffect(() => {
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return scopeStore.watch<T>(
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path,
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(newValue: T) => {
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// NOTE: this is deliberately wrapped in a function,
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// to avoid calling setValue directly with a value that's a function
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setValue(() => newValue)
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},
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deep
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)
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}, [path, scopeStore, deep])
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const scopeSetter = useCallback(
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(newValue: SetStateAction<T>) => {
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setValue(val => {
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const actualNewValue = _.isFunction(newValue) ? newValue(val) : newValue
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scopeStore.set(path, actualNewValue)
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return actualNewValue
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})
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},
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[path, scopeStore]
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)
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return [value, scopeSetter]
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}
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