ra-core
Version:
Core components of react-admin, a frontend Framework for building admin applications on top of REST services, using ES6, React
57 lines • 2.14 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
var react_1 = require("react");
/**
* Debug hook showing which props updated between two renders
* @example
*
* const MyComponent = React.memo(props => {
* useWhyDidYouUpdate('MyComponent', props);
* return <div...;
* });
*
* @link https://usehooks.com/useWhyDidYouUpdate/
*/
function useWhyDidYouUpdate(name, props) {
// Get a mutable ref object where we can store props ...
// ... for comparison next time this hook runs.
var previousProps = (0, react_1.useRef)();
(0, react_1.useEffect)(function () {
if (previousProps.current) {
// Get all keys from previous and current props
var allKeys = Object.keys(__assign(__assign({}, previousProps.current), props));
// Use this object to keep track of changed props
var changesObj_1 = {};
// Iterate through keys
allKeys.forEach(function (key) {
// If previous is different from current
if (previousProps.current[key] !== props[key]) {
// Add to changesObj
changesObj_1[key] = {
from: previousProps.current[key],
to: props[key],
};
}
});
// If changesObj not empty then output to console
if (Object.keys(changesObj_1).length) {
console.log('[why-did-you-update]', name, changesObj_1);
}
}
// Finally update previousProps with current props for next hook call
previousProps.current = props;
});
}
exports.default = useWhyDidYouUpdate;
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