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import browserslist from 'browserslist';
import * as caniuse from 'caniuse-lite';
import FEATURES from '../data/features.js';
import { formatBrowserName } from '../utils/util.js';
/**
* @template T
* @typedef {{missing: T, partial: T}} Filter
*/
/**
* @typedef {Object} MissingSupportResultStats
* @prop {string} title
* @prop {caniuse.Feature} caniuseData
* @prop {string} [missing]
* @prop {Record<string, Record<string, string>>} [missingData]
* @prop {string} [partial]
* @prop {Record<string, Record<string, string>>} [partialData]
*/
/**
* @typedef {Partial<Record<keyof FEATURES, MissingSupportResultStats>>} BrowserSupportStats
*/
/**
* @typedef {Object} MissingSupportResult
* @prop {string[][]} browsers
* @prop {Partial<Record<keyof FEATURES, MissingSupportResultStats>>} features
*/
export default class BrowserSelection {
#list;
/**
* @param {string | string[]} [query]
* @param {string | false} [from]
*/
constructor(query, from) {
this.browsersRequest = query;
const options = from ? { path: from } : {};
this.#list = browserslist(this.browsersRequest, options).map((browser) => browser.split(' '));
}
/**
* @param {string} browser
* @param {string} version
* @return {string[]|undefined}
*/
test(browser, version) {
const versions = version.split('-');
if (versions.length === 1) {
versions.push(versions[0]);
}
return this.#list.find(([b, v]) => b === browser && v >= versions[0] && v <= versions[1]);
}
list() {
return [...this.#list];
}
/**
* @param {Record<string, Record<string, string>>} browserStats
* @return {string}
*/
static lackingBrowsers(browserStats) {
const result = [];
for (const browser of Object.keys(browserStats)) {
result.push(formatBrowserName(browser, Object.keys(browserStats[browser])));
}
return result.join(', ');
}
/**
* @param {import('caniuse-lite').StatsByAgentID} stats
* @return {Filter<Record<string,Record<string, string>>>}
*/
filterStats(stats) {
/** @type {Filter<Record<string,Record<string, string>>>} */
const result = { missing: {}, partial: {} };
for (const [browser, versions] of Object.entries(stats)) {
/** @type {Filter<Record<string,string>>} */
const feature = { missing: {}, partial: {} };
for (const [version, support] of Object.entries(versions)) {
const selected = this.test(browser, version);
// check if browser is NOT fully (i.e., don't have 'y' in their stats) supported
if (!selected) continue;
if ((/(^|\s)y($|\s)/.test(support))) continue;
// when it's not partially supported ('a'), it's missing
const type = (/(^|\s)a($|\s)/.test(support) ? 'partial' : 'missing');
if (!feature[type]) {
feature[type] = {};
}
feature[type][selected[1]] = support;
}
if (Object.keys(feature.missing).length > 0) {
result.missing[browser] = feature.missing;
}
if (Object.keys(feature.partial).length > 0) {
result.partial[browser] = feature.partial;
}
}
return result;
}
/**
* Get data on CSS features not supported by the given autoprefixer-like
* browser selection.
* @return {BrowserSupportStats} `features` is an array of:
* ```
* {
* 'feature-name': {
* title: 'Title of feature'
* missing: "IE (8), Chrome (31)"
* missingData: {
* // map of browser -> version -> (lack of)support code
* ie: { '8': 'n' },
* chrome: { '31': 'n' }
* }
* partialData: {
* // map of browser -> version -> (partial)support code
* ie: { '7': 'a' },
* ff: { '29': 'a #1' }
* }
* caniuseData: {
* // caniuse-db json data for this feature
* }
* },
* 'feature-name-2': {} // etc.
* }
* ```
*
* `feature-name` is a caniuse-db slug.
*/
compileBrowserSupport() {
/** @type {Partial<Record<keyof FEATURES, MissingSupportResultStats>>} */
const result = {};
for (const key of Object.keys(FEATURES)) {
const feature = /** @type {keyof FEATURES} */ (key);
const packedFeature = caniuse.features[feature];
const featureData = caniuse.feature(packedFeature);
const lackData = this.filterStats(featureData.stats);
const missingData = lackData.missing;
const partialData = lackData.partial;
// browsers with missing or partial support for this feature
const missing = BrowserSelection.lackingBrowsers(missingData);
const partial = BrowserSelection.lackingBrowsers(partialData);
if (missing.length > 0 || partial.length > 0) {
result[feature] = {
title: featureData.title,
caniuseData: featureData,
...(missing.length > 0 ? { missingData, missing } : null),
...(partial.length > 0 ? { partialData, partial } : null),
};
}
}
return result;
}
/**
* @see BrowserSelection.compileBrowserSupport
* @param {ConstructorParameters<typeof this>} constructorParameters
* @return {MissingSupportResult} `{browsers, features}`
*/
static missingSupport(...constructorParameters) {
const selection = new BrowserSelection(...constructorParameters);
return {
browsers: selection.list(),
features: selection.compileBrowserSupport(),
};
}
}
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