let asPerformanceEntry: WebAPI.PerformanceAPI.performanceMark => WebAPI.PerformanceAPI.performanceEntry
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let make: ( ~markName: string, ~markOptions: WebAPI.PerformanceAPI.performanceMarkOptions=?,) => WebAPI.PerformanceAPI.performanceMark
let toJSON: WebAPI.PerformanceAPI.performanceMark => Dict.t<string>