lpolito

This is a set of ‘statuses’ that pull request comments must be marked with to help explain intent.

• Required: This must be fixed before merge.
• Nice to have: This should be fixed eventually.
• Personal Preference: I would do this, but you don’t have to.
• Question: What does this do?

^{Modified from Scaling Square Register on objc.io}

lpolito

import React from 'react';
import PropTypes from 'prop-types';

import {useOnUpdateEffect} from 'hooks/use-on-update-effect.mjs';


// Validate form field value simply exists.
export const validateExists = (error) => (value) => (!value ? error : null);

export const formItemPropType = PropTypes.shape({

lpolito

import React from 'react';

export const useOnUpdateEffect = (callback, dependencies) => {
    const isInitRef = React.useRef(false);

    React.useEffect(() => {
        if (!isInitRef.current) {
            isInitRef.current = true;
            return;
        }

lpolito

import React from 'react';

export const useComplexState = (initialState) => {
    const initialStateRef = React.useRef(null);
    if (initialStateRef.current === null) {
        // Only get initialState once. This is a sort of memoization of initalState functions.
        initialStateRef.current = typeof initialState === 'function' ? initialState() : initialState;
    }

    // useReducer returns [state, dispatch].

lpolito

import React from 'react';
import PropTypes from 'prop-types';
import isEqual from 'lodash/isEqual.js';

import {useComplexState} from 'hooks/use-complex-state.mjs';
import {useOnUpdateEffect} from 'hooks/use-on-update-effect.mjs';


// FormItems contexts
const FormItemsContext = React.createContext();

lpolito

import React from 'react';

// Initialize a ref once during init to prevent something being redefined on every render.
export const useLazyInit = (value) => {
    const valueRef = React.useRef(null);

    if (valueRef.current === null) {
        valueRef.current = typeof value === 'function' ? value() : value;
    }