React hooks in Gatsby: Invalid hook call

问题

Trying to implement a custom hook from a react example: https://reactjs.org/docs/hooks-faq.html#how-to-get-the-previous-props-or-state, but I get the following error:

ERROR:

Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app

The error happen on useEffect when I try to import it as a custom hook usePrevious.

I tried following: verified that react-dom and react is on the same version react-dom@16.8.5 react@16.8.5

Verfied I only have one version of React

Also I do belive the code is not breaking any rules of hooks.

Also tried looking at related issues here on stackoverflow.

CODE:

// file: use-previous.js

import { useRef, useEffect} from "React"

export const usePrevious = (value) =>  {

    const ref = useRef();
    useEffect(() => {
      ref.current = value;
    });




    return ref.current;
}

// file: layout.js

import React, { useState, useEffect } from "react"

import Header from "./header/header"

import { useFacetsData } from "../hooks/use-facets-data"
import { usePrevious } from "../hooks/use-previous"


export default ({ children, ...props }) => {

    const [ searchValue, setSearchValue ] = useState("")

    const [ facetsSelected, setFacetsSelected ] = useState([])

    const facets = useFacetsData()


    const oldSearchValue = usePrevious(searchValue)
    // const oldFacetsSelected = usePrevious(facetsSelected)

    useEffect(() => {
        // if new searchvalue or new facetvalue

        // if (searchValue !== oldSearchValue || facetsSelected !== oldFacetsSelected) makeSearch()
    }) 

    function makeSearch() {
        console.log('make search')

        // move to searchpage 
    }

    function handleSearchChange(search) {
        setSearchValue(search)
    }

    function handleFacetChange(facets) {
        setFacetsSelected(facets)
    }   

    return   (
        <div>
            {/* Main sticky header */}
            <Header 
                facets={ facets } 
                onSearchChange={ handleSearchChange } 
                onFacetChange={ handleFacetChange } >
            </Header>

            {/* route content */}
           {React.cloneElement(children, { facets })}
        </div>
    )
}

回答1:

Your import in usePrevious hooks file is incorrect. useRef and useEffect should be import from 'react' and not React;

import { useRef, useEffect} from "react"

来源：https://stackoverflow.com/questions/55373010/react-hooks-in-gatsby-invalid-hook-call

标签

javascript

reactjs

gatsby

react-hooks