sanity-plugin-spreadsheet-wizard-x/src/Context.js

Spreadsheet Wizard is a magnificient Sanity plugin that help you EXPORT & IMPORT spreadsheets. A fantastic bridge between Sanity & your spreadsheet software of choice. (Google Sheets... Excel... Numbers etc.)

import React, { useContext, useState } from "react";

const docsDataContext = React.createContext(null);

//
// the is supposed to be an array of objects whose key
// is the doc name, and the value the data of that docs
//
const defaultDocsValues = [];

const DocsDataProvider = ({ children }) => {
    const [values, setValues] = useState(defaultDocsValues);
    const DocsDataContext = docsDataContext;
    return (
        <DocsDataContext.Provider value={{ values, setValues }}>
            {children}
        </DocsDataContext.Provider>
    );
};

const useDocsData = () => {
    const { values, setValues } = useContext(docsDataContext);
    function handleChange(newValue) {
        //
        // newValue is supposed to be {doc: 'XXX', value: 'YYY'}
        // where XXX is the doc name and YYY is the value of things in that doc
        //
        setValues((oldValues) =>
            !!oldValues.find((thing) => thing.doc === newValue.doc)
                ? oldValues.reduce(
                      (prev, curr) => [
                          ...prev,
                          curr.doc === newValue.doc ? newValue : curr,
                      ],
                      []
                  )
                : [...oldValues, newValue]
        );
    }
    return [values, handleChange];
};

export { useDocsData, DocsDataProvider };