| 'use strict'; |
| const { coerce, lt, lte } = require('semver'); |
| const browserslist = require('browserslist'); |
| const data = require('./data'); |
| const getModulesListForTargetVersion = require('./get-modules-list-for-target-version'); |
| const intersection = require('core-js-pure/features/set/intersection'); |
| const has = Function.call.bind({}.hasOwnProperty); |
| |
| const mapping = new Map([ |
| ['ios_saf', 'ios'], |
| ['and_chr', 'chrome'], |
| ['and_ff', 'firefox'], |
| ]); |
| |
| const validTargets = new Set([ |
| 'android', |
| 'chrome', |
| 'edge', |
| 'electron', |
| 'firefox', |
| 'ie', |
| 'ios', |
| 'node', |
| 'opera', |
| 'phantom', |
| 'safari', |
| 'samsung', |
| ]); |
| |
| function coercedLte(a, b) { |
| return lte(coerce(a), coerce(b)); |
| } |
| |
| function coercedLt(a, b) { |
| return lt(coerce(a), coerce(b)); |
| } |
| |
| function normalizeBrowsersList(list) { |
| return list.map(it => { |
| let [engine, version] = it.split(' '); |
| if (mapping.has(engine)) engine = mapping.get(engine); |
| else if (engine === 'android' && !coercedLte(version, '4.4.4')) engine = 'chrome'; |
| return [engine, version]; |
| }).filter(([engine]) => validTargets.has(engine)); |
| } |
| |
| function reduceByMinVersion(list) { |
| const targets = new Map(); |
| for (const [engine, version] of list) { |
| if (!targets.has(engine) || coercedLte(version, targets.get(engine))) { |
| targets.set(engine, version); |
| } |
| } |
| return targets; |
| } |
| |
| function checkModule(name, targets) { |
| if (!has(data, name)) throw new TypeError(`Incorrect module: ${ name }`); |
| const requirements = data[name]; |
| const result = { |
| required: false, |
| targets: {}, |
| }; |
| for (const [engine, version] of targets) { |
| if (!has(requirements, engine) || coercedLt(version, requirements[engine])) { |
| result.required = true; |
| result.targets[engine] = version; |
| } |
| } |
| return result; |
| } |
| |
| function compat({ targets, filter, version }) { |
| const list = browserslist(targets); |
| const engines = normalizeBrowsersList(list); |
| const reducedTargets = reduceByMinVersion(engines); |
| |
| const result = { |
| list: [], |
| targets: {}, |
| }; |
| |
| let modules = Array.isArray(filter) ? filter : Object.keys(data); |
| |
| if (filter instanceof RegExp) modules = modules.filter(it => filter.test(it)); |
| else if (typeof filter == 'string') modules = modules.filter(it => it.startsWith(filter)); |
| |
| if (version) { |
| modules = [...intersection(new Set(getModulesListForTargetVersion(version)), new Set(modules))]; |
| } |
| |
| modules.forEach(key => { |
| const check = checkModule(key, reducedTargets); |
| if (check.required) { |
| result.list.push(key); |
| result.targets[key] = check.targets; |
| } |
| }); |
| |
| return result; |
| } |
| |
| module.exports = compat; |
| module.exports.compat = compat; |
| module.exports.getModulesListForTargetVersion = getModulesListForTargetVersion; |