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perf(input-time-zone): improve memory footprint by leveraging browser cache and releasing utils after their use #9945

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merged 1 commit into from
Aug 14, 2024
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perf(input-time-zone): improve memory footprint by leveraging browser cache and releasing utils after their use #9945

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37 changes: 3 additions & 34 deletions packages/calcite-components/src/components/input-time-zone/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -56,23 +56,6 @@ export function getUserTimeZoneName(): string {
return dateFormatter.resolvedOptions().timeZone;
}

/**
* The lazy-loaded timezone-groups lib to be used across instances.
*/
let offsetGroupUtils: Promise<
[
typeof import("timezone-groups/dist/groupByOffset/index.mjs"),
typeof import("timezone-groups/dist/groupByOffset/strategy/native.mjs"),
]
>;
let regionGroupUtils: Promise<
[
typeof import("timezone-groups/dist/groupByRegion/index.mjs"),
typeof import("timezone-groups/dist/utils/country.mjs"),
]
>;
let nameGroupUtils: Promise<typeof import("timezone-groups/dist/groupByName/index.mjs")>;

export async function createTimeZoneItems(
locale: SupportedLocale,
messages: InputTimeZoneMessages,
Expand All @@ -81,11 +64,7 @@ export async function createTimeZoneItems(
standardTime: OffsetStyle,
): Promise<TimeZoneItem[] | TimeZoneItemGroup[]> {
if (mode === "name") {
if (!nameGroupUtils) {
nameGroupUtils = import("timezone-groups/dist/groupByName/index.mjs");
}

return nameGroupUtils.then(async ({ groupByName }) => {
const { groupByName } = await import("timezone-groups/dist/groupByName/index.mjs");
const groups = await groupByName();

return groups
Expand All @@ -101,7 +80,6 @@ export async function createTimeZoneItems(
})
.filter((group) => !!group)
.sort();
});
}

const effectiveLocale =
Expand All @@ -114,14 +92,10 @@ export async function createTimeZoneItems(
const referenceDateInMs: number = referenceDate.getTime();

if (mode === "region") {
if (!regionGroupUtils) {
regionGroupUtils = Promise.all([
const [{ groupByRegion }, { getCountry }] = await Promise.all([
import("timezone-groups/dist/groupByRegion/index.mjs"),
import("timezone-groups/dist/utils/country.mjs"),
]);
}

return regionGroupUtils.then(async ([{ groupByRegion }, { getCountry }]) => {
const groups = await groupByRegion();

return groups
Expand All @@ -146,17 +120,13 @@ export async function createTimeZoneItems(
};
})
.sort((groupA, groupB) => groupA.label.localeCompare(groupB.label));
});
}

if (!offsetGroupUtils) {
offsetGroupUtils = Promise.all([
const [{ groupByOffset }, { DateEngine }] = await Promise.all([
import("timezone-groups/dist/groupByOffset/index.mjs"),
import("timezone-groups/dist/groupByOffset/strategy/native/index.mjs"),
]);
}

return offsetGroupUtils.then(async ([{ groupByOffset }, { DateEngine }]) => {
const groups = await groupByOffset({
dateEngine: new DateEngine(),
groupDateRange: 1,
Expand Down Expand Up @@ -202,7 +172,6 @@ export async function createTimeZoneItems(
})
.filter((group) => !!group)
.sort((groupA, groupB) => groupA.value - groupB.value);
});
}

function getTimeZoneLabel(timeZone: string, messages: InputTimeZoneMessages): string {
Expand Down
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