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- {"version":3,"file":"observe.js","sources":["../../../../../src/browser/web-vitals/lib/observe.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 type { FirstInputPolyfillEntry, NavigationTimingPolyfillEntry, PerformancePaintTiming } from '../types';\n\nexport interface PerformanceEntryHandler {\n (entry: PerformanceEntry): void;\n}\n\ninterface PerformanceEntryMap {\n event: PerformanceEventTiming[];\n paint: PerformancePaintTiming[];\n 'layout-shift': LayoutShift[];\n 'largest-contentful-paint': LargestContentfulPaint[];\n 'first-input': PerformanceEventTiming[] | FirstInputPolyfillEntry[];\n navigation: PerformanceNavigationTiming[] | NavigationTimingPolyfillEntry[];\n resource: PerformanceResourceTiming[];\n longtask: PerformanceEntry[];\n}\n\n/**\n * Takes a performance entry type and a callback function, and creates a\n * `PerformanceObserver` instance that will observe the specified entry type\n * with buffering enabled and call the callback _for each entry_.\n *\n * This function also feature-detects entry support and wraps the logic in a\n * try/catch to avoid errors in unsupporting browsers.\n */\nexport const observe = <K extends keyof PerformanceEntryMap>(\n type: K,\n callback: (entries: PerformanceEntryMap[K]) => void,\n opts?: PerformanceObserverInit,\n): PerformanceObserver | undefined => {\n try {\n if (PerformanceObserver.supportedEntryTypes.includes(type)) {\n const po = new PerformanceObserver(list => {\n callback(list.getEntries() as PerformanceEntryMap[K]);\n });\n po.observe(\n Object.assign(\n {\n type,\n buffered: true,\n },\n opts || {},\n ) as PerformanceObserverInit,\n );\n return po;\n }\n } catch (e) {\n // Do nothing.\n }\n return;\n};\n"],"names":[],"mappings":";;AAiCA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAM,UAAU;AACvB,EAAE,IAAI;AACN,EAAE,QAAQ;AACV,EAAE,IAAI;AACN,KAAsC;AACtC,EAAE,IAAI;AACN,IAAI,IAAI,mBAAmB,CAAC,mBAAmB,CAAC,QAAQ,CAAC,IAAI,CAAC,EAAE;AAChE,MAAM,MAAM,EAAG,GAAE,IAAI,mBAAmB,CAAC,QAAQ;AACjD,QAAQ,QAAQ,CAAC,IAAI,CAAC,UAAU,IAA6B,CAAA;AAC7D,OAAO,CAAC,CAAA;AACR,MAAM,EAAE,CAAC,OAAO;AAChB,QAAQ,MAAM,CAAC,MAAM;AACrB,UAAU;AACV,YAAY,IAAI;AAChB,YAAY,QAAQ,EAAE,IAAI;AAC1B,WAAW;AACX,UAAU,IAAA,IAAQ,EAAE;AACpB,SAAU;AACV,OAAO,CAAA;AACP,MAAM,OAAO,EAAE,CAAA;AACf,KAAI;AACJ,GAAI,CAAA,OAAO,CAAC,EAAE;AACd;AACA,GAAE;AACF,EAAE,OAAM;AACR;;;;"}
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