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- {"version":3,"file":"getVisibilityWatcher.js","sources":["../../../../../src/browser/web-vitals/lib/getVisibilityWatcher.ts"],"sourcesContent":["/*\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { WINDOW } from '../../types';\nimport { onHidden } from './onHidden';\n\nlet firstHiddenTime = -1;\n\nconst initHiddenTime = (): number => {\n // If the document is hidden and not prerendering, assume it was always\n // hidden and the page was loaded in the background.\n return WINDOW.document.visibilityState === 'hidden' && !WINDOW.document.prerendering ? 0 : Infinity;\n};\n\nconst trackChanges = (): void => {\n // Update the time if/when the document becomes hidden.\n onHidden(({ timeStamp }) => {\n firstHiddenTime = timeStamp;\n }, true);\n};\n\nexport const getVisibilityWatcher = (): {\n readonly firstHiddenTime: number;\n} => {\n if (firstHiddenTime < 0) {\n // If the document is hidden when this code runs, assume it was hidden\n // since navigation start. This isn't a perfect heuristic, but it's the\n // best we can do until an API is available to support querying past\n // visibilityState.\n firstHiddenTime = initHiddenTime();\n trackChanges();\n }\n return {\n get firstHiddenTime() {\n return firstHiddenTime;\n },\n };\n};\n"],"names":["WINDOW","onHidden"],"mappings":";;;;;AAAA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AAIA;AACA,IAAI,eAAA,GAAkB,CAAC,CAAC,CAAA;AACxB;AACA,MAAM,cAAA,GAAiB,MAAc;AACrC;AACA;AACA,EAAE,OAAOA,YAAM,CAAC,QAAQ,CAAC,eAAA,KAAoB,QAAS,IAAG,CAACA,YAAM,CAAC,QAAQ,CAAC,eAAe,CAAA,GAAI,QAAQ,CAAA;AACrG,CAAC,CAAA;AACD;AACA,MAAM,YAAA,GAAe,MAAY;AACjC;AACA,EAAEC,iBAAQ,CAAC,CAAC,EAAE,SAAU,EAAC,KAAK;AAC9B,IAAI,eAAA,GAAkB,SAAS,CAAA;AAC/B,GAAG,EAAE,IAAI,CAAC,CAAA;AACV,CAAC,CAAA;AACD;AACO,MAAM,oBAAqB,GAAE;AAClC;AACF,KAAK;AACL,EAAE,IAAI,eAAgB,GAAE,CAAC,EAAE;AAC3B;AACA;AACA;AACA;AACA,IAAI,eAAgB,GAAE,cAAc,EAAE,CAAA;AACtC,IAAI,YAAY,EAAE,CAAA;AAClB,GAAE;AACF,EAAE,OAAO;AACT,IAAI,IAAI,eAAe,GAAG;AAC1B,MAAM,OAAO,eAAe,CAAA;AAC5B,KAAK;AACL,GAAG,CAAA;AACH;;;;"}
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