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const STEPS = {};
const types = (self.PerformanceObserver
&& self.PerformanceObserver.supportedEntryTypes)?
self.PerformanceObserver.supportedEntryTypes
: undefined;
if (types) {
// we observe everything as soon as possible
new PerformanceObserver(function (list, observer) {
for (const entry of list.getEntries())
if (STEPS[entry.entryType]) STEPS[entry.entryType](entry);
}).observe({entryTypes: self.PerformanceObserver.supportedEntryTypes});
}
function test_support(def) {
if (!types || !types.includes(def[0])) {
return;
}
const desc = `'${def[0]}' entries should be observable`;
const t = async_test(desc);
STEPS[def[0]] = (entry) => {
t.step(() => assert_equals(Object.prototype.toString.call(entry),
`[object ${def[1]}]`,
`Class name of entry should be ${def[1]}.`));
t.done();
}
}