@callstack/reassure-measure/lib/module/redundant-renders.js

Performance measurement library for React and React Native

import { format as prettyFormat, plugins } from 'pretty-format';
export function detectRedundantUpdates(elementTrees, initialRenderCount) {
  const result = [];
  for (let i = 1; i < elementTrees.length; i += 1) {
    if (isJsonTreeEqual(elementTrees[i], elementTrees[i - 1])) {
      // We want to return correct render index, so we need to take into account:
      // - initial render count that happened before we have access to the element tree
      // - the fact that the last initial render is double counted as first element tree
      result.push(i + initialRenderCount - 1);
    }
  }
  return result;
}
const formatOptionsZeroIndent = {
  plugins: [plugins.ReactTestComponent],
  indent: 0
};
function isJsonTreeEqual(left, right) {
  const formattedLeft = prettyFormat(left, formatOptionsZeroIndent);
  const formattedRight = prettyFormat(right, formatOptionsZeroIndent);
  return formattedLeft === formattedRight;
}
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