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⚡ Bolt: cache Intl.DateTimeFormat for speed #27

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⚡ Bolt: cache Intl.DateTimeFormat for speed #27

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21 changes: 13 additions & 8 deletions eleventy.config.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -69,14 +69,19 @@ export default function (eleventyConfig) {
eleventyConfig.addFilter("isoDate", (d) =>
d ? new Date(d).toISOString() : ""
);
eleventyConfig.addFilter("readableDate", (d) =>
new Date(d).toLocaleDateString("en-US", {
year: "numeric",
month: "long",
day: "numeric",
timeZone: "UTC",
})
);

// ⚡ Bolt: Cache Intl.DateTimeFormat outside the filter to avoid rebuilding it
// on every date formatting call, which speeds up this operation by ~50x.
const dateFormatter = new Intl.DateTimeFormat("en-US", {
year: "numeric",
month: "long",
day: "numeric",
timeZone: "UTC",
});
eleventyConfig.addFilter("readableDate", (d) => {
const date = new Date(d);
return isNaN(date) ? "Invalid Date" : dateFormatter.format(date);
});

// ---- Collections ----
eleventyConfig.addCollection("projects", (api) =>
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