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19 lines
676 B
TypeScript
19 lines
676 B
TypeScript
/*
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* SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
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*
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import equal from 'fast-deep-equal'
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import { RefObject, useEffect, useRef } from 'react'
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import { TocAst } from '../../../external-types/markdown-it-toc-done-right/interface'
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export const usePostTocAstOnChange = (tocAst: RefObject<TocAst|undefined>, onTocChange?: (ast: TocAst) => void): void => {
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const lastTocAst = useRef<TocAst>()
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useEffect(() => {
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if (onTocChange && tocAst.current && !equal(tocAst, lastTocAst.current)) {
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lastTocAst.current = tocAst.current
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onTocChange(tocAst.current)
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}
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}, [onTocChange, tocAst])
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}
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