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perf(merge-config): optimize mergeConfig performance by avoiding duplicate key visits; (#5679)
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@@ -95,7 +95,7 @@ export default function mergeConfig(config1, config2) {
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headers: (a, b) => mergeDeepProperties(headersToObject(a), headersToObject(b), true)
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};
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utils.forEach(Object.keys(config1).concat(Object.keys(config2)), function computeConfigValue(prop) {
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utils.forEach(Object.keys(Object.assign({}, config1, config2)), function computeConfigValue(prop) {
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const merge = mergeMap[prop] || mergeDeepProperties;
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const configValue = merge(config1[prop], config2[prop], prop);
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(utils.isUndefined(configValue) && merge !== mergeDirectKeys) || (config[prop] = configValue);
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