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33 lines
1.3 KiB
33 lines
1.3 KiB
/* |
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* Copyright 2020 Google LLC |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* https://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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export const bindReporter = (callback, metric, reportAllChanges) => { |
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let prevValue; |
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return (forceReport) => { |
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if (metric.value >= 0) { |
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if (forceReport || reportAllChanges) { |
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metric.delta = metric.value - (prevValue || 0); |
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// Report the metric if there's a non-zero delta or if no previous |
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// value exists (which can happen in the case of the document becoming |
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// hidden when the metric value is 0). |
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// See: https://github.com/GoogleChrome/web-vitals/issues/14 |
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if (metric.delta || prevValue === undefined) { |
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prevValue = metric.value; |
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callback(metric); |
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} |
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} |
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} |
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}; |
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};
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