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

Performance measurement library for React and React Native

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.detectRedundantUpdates = detectRedundantUpdates;
var _prettyFormat = require("pretty-format");
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: [_prettyFormat.plugins.ReactTestComponent],
  indent: 0
};
function isJsonTreeEqual(left, right) {
  const formattedLeft = (0, _prettyFormat.format)(left, formatOptionsZeroIndent);
  const formattedRight = (0, _prettyFormat.format)(right, formatOptionsZeroIndent);
  return formattedLeft === formattedRight;
}
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