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Performance: cache browserSelection by resolved browserslist #199

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merged 2 commits into from
Jan 13, 2025
Merged

Performance: cache browserSelection by resolved browserslist #199

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c20342a
cache browserSelection by resolved browserslist
thoughtspile Jan 9, 2025
ffaf31e
move cache to static field
thoughtspile Jan 13, 2025
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21 changes: 9 additions & 12 deletions lib/BrowserSelection.js
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,11 @@ export default class BrowserSelection {
* `feature-name` is a caniuse-db slug.
*/
compileBrowserSupport() {
const cacheKey = JSON.stringify(this.#list);
if (BrowserSelection.#browserSupportCache.has(cacheKey)) {
return BrowserSelection.#browserSupportCache.get(cacheKey);
}

/** @type {Partial<Record<keyof FEATURES, MissingSupportResultStats>>} */
const result = {};

Expand All @@ -164,11 +169,12 @@ export default class BrowserSelection {
}
}

BrowserSelection.#browserSupportCache.set(cacheKey, result);
return result;
}

/** @type {Map<string, MissingSupportResult>} @readonly */
static #missingSupportCache = new Map();
/** @type {Map<string, BrowserSupportStats>} */
static #browserSupportCache = new Map();

/**
* @see BrowserSelection.compileBrowserSupport
Expand All @@ -177,19 +183,10 @@ export default class BrowserSelection {
*/
static missingSupport(...constructorParameters) {
const [query, path] = constructorParameters;
// browserslist only uses `path` if `query` is not provided.
const key = query ? JSON.stringify(query) : path;

if (key && this.#missingSupportCache.has(key)) {
return this.#missingSupportCache.get(key);
}

const selection = new BrowserSelection(query, path);
const result = {
return {
browsers: selection.list(),
features: selection.compileBrowserSupport(),
};
if (key) this.#missingSupportCache.set(key, result);
return result;
}
}
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