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'use strict';
const browserslist = require('browserslist');
const { compare, has } = require('./helpers');
const external = require('./external');
const aliases = new Map([
['and_chr', 'chrome-android'],
['and_ff', 'firefox-android'],
['ie_mob', 'ie'],
['ios_saf', 'ios'],
['oculus', 'quest'],
['op_mob', 'opera-android'],
// TODO: Remove from `core-js@4`
['opera_mobile', 'opera-android'],
['react', 'react-native'],
['reactnative', 'react-native'],
]);
const validTargets = new Set([
'android',
'bun',
'chrome',
'chrome-android',
'deno',
'edge',
'electron',
'firefox',
'firefox-android',
'hermes',
'ie',
'ios',
'node',
'opera',
'opera-android',
'phantom',
'quest',
'react-native',
'rhino',
'safari',
'samsung',
]);
const toLowerKeys = function (object) {
return Object.entries(object).reduce((accumulator, [key, value]) => {
accumulator[key.toLowerCase()] = value;
return accumulator;
}, {});
};
module.exports = function (targets) {
const { browsers, esmodules, node, ...rest } = (typeof targets != 'object' || Array.isArray(targets))
? { browsers: targets } : toLowerKeys(targets);
const list = Object.entries(rest);
if (browsers) {
if (typeof browsers == 'string' || Array.isArray(browsers)) {
list.push(...browserslist(browsers).map(it => it.split(' ')));
} else {
list.push(...Object.entries(browsers));
}
}
if (esmodules) {
list.push(...Object.entries(external.modules));
}
if (node) {
list.push(['node', node === 'current' ? process.versions.node : node]);
}
const normalized = list.map(([engine, version]) => {
if (has(browserslist.aliases, engine)) {
engine = browserslist.aliases[engine];
}
if (aliases.has(engine)) {
engine = aliases.get(engine);
}
return [engine, String(version)];
}).filter(([engine]) => {
return validTargets.has(engine);
}).sort(([a], [b]) => {
return a < b ? -1 : a > b ? 1 : 0;
});
const reducedByMinVersion = new Map();
for (const [engine, version] of normalized) {
if (!reducedByMinVersion.has(engine) || compare(version, '<=', reducedByMinVersion.get(engine))) {
reducedByMinVersion.set(engine, version);
}
}
return reducedByMinVersion;
};
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