| 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Sergey Melyukov @smelukov
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| 4 | */
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| 5 |
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| 6 | "use strict";
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| 7 |
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| 8 | const browserslist = require("browserslist");
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| 9 | const path = require("path");
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| 10 |
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| 11 | /** @typedef {import("./target").ApiTargetProperties} ApiTargetProperties */
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| 12 | /** @typedef {import("./target").EcmaTargetProperties} EcmaTargetProperties */
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| 13 | /** @typedef {import("./target").PlatformTargetProperties} PlatformTargetProperties */
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| 14 |
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| 15 | // [[C:]/path/to/config][:env]
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| 16 | const inputRx = /^(?:((?:[A-Z]:)?[/\\].*?))?(?::(.+?))?$/i;
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| 17 |
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| 18 | /**
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| 19 | * @typedef {Object} BrowserslistHandlerConfig
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| 20 | * @property {string=} configPath
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| 21 | * @property {string=} env
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| 22 | * @property {string=} query
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| 23 | */
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| 24 |
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| 25 | /**
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| 26 | * @param {string} input input string
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| 27 | * @param {string} context the context directory
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| 28 | * @returns {BrowserslistHandlerConfig} config
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| 29 | */
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| 30 | const parse = (input, context) => {
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| 31 | if (!input) {
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| 32 | return {};
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| 33 | }
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| 34 |
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| 35 | if (path.isAbsolute(input)) {
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| 36 | const [, configPath, env] = inputRx.exec(input) || [];
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| 37 | return { configPath, env };
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| 38 | }
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| 39 |
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| 40 | const config = browserslist.findConfig(context);
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| 41 |
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| 42 | if (config && Object.keys(config).includes(input)) {
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| 43 | return { env: input };
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| 44 | }
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| 45 |
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| 46 | return { query: input };
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| 47 | };
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| 48 |
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| 49 | /**
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| 50 | * @param {string} input input string
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| 51 | * @param {string} context the context directory
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| 52 | * @returns {string[] | undefined} selected browsers
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| 53 | */
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| 54 | const load = (input, context) => {
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| 55 | const { configPath, env, query } = parse(input, context);
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| 56 |
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| 57 | // if a query is specified, then use it, else
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| 58 | // if a path to a config is specified then load it, else
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| 59 | // find a nearest config
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| 60 | const config = query
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| 61 | ? query
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| 62 | : configPath
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| 63 | ? browserslist.loadConfig({
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| 64 | config: configPath,
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| 65 | env
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| 66 | })
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| 67 | : browserslist.loadConfig({ path: context, env });
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| 68 |
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| 69 | if (!config) return null;
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| 70 | return browserslist(config);
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| 71 | };
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| 72 |
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| 73 | /**
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| 74 | * @param {string[]} browsers supported browsers list
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| 75 | * @returns {EcmaTargetProperties & PlatformTargetProperties & ApiTargetProperties} target properties
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| 76 | */
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| 77 | const resolve = browsers => {
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| 78 | /**
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| 79 | * Checks all against a version number
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| 80 | * @param {Record<string, number | [number, number]>} versions first supported version
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| 81 | * @returns {boolean} true if supports
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| 82 | */
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| 83 | const rawChecker = versions => {
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| 84 | return browsers.every(v => {
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| 85 | const [name, parsedVersion] = v.split(" ");
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| 86 | if (!name) return false;
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| 87 | const requiredVersion = versions[name];
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| 88 | if (!requiredVersion) return false;
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| 89 | const [parsedMajor, parserMinor] =
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| 90 | // safari TP supports all features for normal safari
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| 91 | parsedVersion === "TP"
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| 92 | ? [Infinity, Infinity]
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| 93 | : parsedVersion.split(".");
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| 94 | if (typeof requiredVersion === "number") {
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| 95 | return +parsedMajor >= requiredVersion;
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| 96 | }
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| 97 | return requiredVersion[0] === +parsedMajor
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| 98 | ? +parserMinor >= requiredVersion[1]
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| 99 | : +parsedMajor > requiredVersion[0];
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| 100 | });
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| 101 | };
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| 102 | const anyNode = browsers.some(b => /^node /.test(b));
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| 103 | const anyBrowser = browsers.some(b => /^(?!node)/.test(b));
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| 104 | const browserProperty = !anyBrowser ? false : anyNode ? null : true;
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| 105 | const nodeProperty = !anyNode ? false : anyBrowser ? null : true;
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| 106 | // Internet Explorer Mobile, Blackberry browser and Opera Mini are very old browsers, they do not support new features
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| 107 | const es6DynamicImport = rawChecker({
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| 108 | chrome: 63,
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| 109 | and_chr: 63,
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| 110 | edge: 79,
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| 111 | firefox: 67,
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| 112 | and_ff: 67,
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| 113 | // ie: Not supported
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| 114 | opera: 50,
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| 115 | op_mob: 46,
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| 116 | safari: [11, 1],
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| 117 | ios_saf: [11, 3],
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| 118 | samsung: [8, 2],
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| 119 | android: 63,
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| 120 | and_qq: [10, 4],
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| 121 | // baidu: Not supported
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| 122 | // and_uc: Not supported
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| 123 | // kaios: Not supported
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| 124 | // Since Node.js 13.14.0 no warning about usage, but it was added 8.5.0 with some limitations and it was improved in 12.0.0 and 13.2.0
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| 125 | node: [13, 14]
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| 126 | });
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| 127 |
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| 128 | return {
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| 129 | const: rawChecker({
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| 130 | chrome: 49,
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| 131 | and_chr: 49,
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| 132 | edge: 12,
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| 133 | // Prior to Firefox 13, <code>const</code> is implemented, but re-assignment is not failing.
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| 134 | // Prior to Firefox 46, a <code>TypeError</code> was thrown on redeclaration instead of a <code>SyntaxError</code>.
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| 135 | firefox: 36,
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| 136 | and_ff: 36,
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| 137 | // Not supported in for-in and for-of loops
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| 138 | // ie: Not supported
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| 139 | opera: 36,
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| 140 | op_mob: 36,
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| 141 | safari: [10, 0],
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| 142 | ios_saf: [10, 0],
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| 143 | // Before 5.0 supported correctly in strict mode, otherwise supported without block scope
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| 144 | samsung: [5, 0],
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| 145 | android: 37,
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| 146 | and_qq: [10, 4],
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| 147 | // Supported correctly in strict mode, otherwise supported without block scope
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| 148 | // baidu: Not supported
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| 149 | and_uc: [12, 12],
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| 150 | kaios: [2, 5],
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| 151 | node: [6, 0]
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| 152 | }),
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| 153 | arrowFunction: rawChecker({
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| 154 | chrome: 45,
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| 155 | and_chr: 45,
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| 156 | edge: 12,
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| 157 | // The initial implementation of arrow functions in Firefox made them automatically strict. This has been changed as of Firefox 24. The use of <code>'use strict';</code> is now required.
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| 158 | // Prior to Firefox 39, a line terminator (<code>\\n</code>) was incorrectly allowed after arrow function arguments. This has been fixed to conform to the ES2015 specification and code like <code>() \\n => {}</code> will now throw a <code>SyntaxError</code> in this and later versions.
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| 159 | firefox: 39,
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| 160 | and_ff: 39,
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| 161 | // ie: Not supported,
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| 162 | opera: 32,
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| 163 | op_mob: 32,
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| 164 | safari: 10,
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| 165 | ios_saf: 10,
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| 166 | samsung: [5, 0],
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| 167 | android: 45,
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| 168 | and_qq: [10, 4],
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| 169 | baidu: [7, 12],
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| 170 | and_uc: [12, 12],
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| 171 | kaios: [2, 5],
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| 172 | node: [6, 0]
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| 173 | }),
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| 174 | forOf: rawChecker({
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| 175 | chrome: 38,
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| 176 | and_chr: 38,
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| 177 | edge: 12,
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| 178 | // Prior to Firefox 51, using the for...of loop construct with the const keyword threw a SyntaxError ("missing = in const declaration").
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| 179 | firefox: 51,
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| 180 | and_ff: 51,
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| 181 | // ie: Not supported,
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| 182 | opera: 25,
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| 183 | op_mob: 25,
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| 184 | safari: 7,
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| 185 | ios_saf: 7,
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| 186 | samsung: [3, 0],
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| 187 | android: 38,
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| 188 | // and_qq: Unknown support
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| 189 | // baidu: Unknown support
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| 190 | // and_uc: Unknown support
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| 191 | // kaios: Unknown support
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| 192 | node: [0, 12]
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| 193 | }),
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| 194 | destructuring: rawChecker({
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| 195 | chrome: 49,
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| 196 | and_chr: 49,
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| 197 | edge: 14,
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| 198 | firefox: 41,
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| 199 | and_ff: 41,
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| 200 | // ie: Not supported,
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| 201 | opera: 36,
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| 202 | op_mob: 36,
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| 203 | safari: 8,
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| 204 | ios_saf: 8,
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| 205 | samsung: [5, 0],
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| 206 | android: 49,
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| 207 | // and_qq: Unknown support
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| 208 | // baidu: Unknown support
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| 209 | // and_uc: Unknown support
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| 210 | // kaios: Unknown support
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| 211 | node: [6, 0]
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| 212 | }),
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| 213 | bigIntLiteral: rawChecker({
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| 214 | chrome: 67,
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| 215 | and_chr: 67,
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| 216 | edge: 79,
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| 217 | firefox: 68,
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| 218 | and_ff: 68,
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| 219 | // ie: Not supported,
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| 220 | opera: 54,
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| 221 | op_mob: 48,
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| 222 | safari: 14,
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| 223 | ios_saf: 14,
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| 224 | samsung: [9, 2],
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| 225 | android: 67,
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| 226 | // and_qq: Not supported
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| 227 | // baidu: Not supported
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| 228 | // and_uc: Not supported
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| 229 | // kaios: Not supported
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| 230 | node: [10, 4]
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| 231 | }),
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| 232 | // Support syntax `import` and `export` and no limitations and bugs on Node.js
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| 233 | // Not include `export * as namespace`
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| 234 | module: rawChecker({
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| 235 | chrome: 61,
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| 236 | and_chr: 61,
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| 237 | edge: 16,
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| 238 | firefox: 60,
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| 239 | and_ff: 60,
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| 240 | // ie: Not supported,
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| 241 | opera: 48,
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| 242 | op_mob: 45,
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| 243 | safari: [10, 1],
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| 244 | ios_saf: [10, 3],
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| 245 | samsung: [8, 0],
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| 246 | android: 61,
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| 247 | and_qq: [10, 4],
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| 248 | // baidu: Not supported
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| 249 | // and_uc: Not supported
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| 250 | // kaios: Not supported
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| 251 | // Since Node.js 13.14.0 no warning about usage, but it was added 8.5.0 with some limitations and it was improved in 12.0.0 and 13.2.0
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| 252 | node: [13, 14]
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| 253 | }),
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| 254 | dynamicImport: es6DynamicImport,
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| 255 | dynamicImportInWorker: es6DynamicImport && !anyNode,
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| 256 | // browserslist does not have info about globalThis
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| 257 | // so this is based on mdn-browser-compat-data
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| 258 | globalThis: rawChecker({
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| 259 | chrome: 71,
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| 260 | and_chr: 71,
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| 261 | edge: 79,
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| 262 | firefox: 65,
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| 263 | and_ff: 65,
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| 264 | // ie: Not supported,
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| 265 | opera: 58,
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| 266 | op_mob: 50,
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| 267 | safari: [12, 1],
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| 268 | ios_saf: [12, 2],
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| 269 | samsung: [10, 1],
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| 270 | android: 71,
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| 271 | // and_qq: Unknown support
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| 272 | // baidu: Unknown support
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| 273 | // and_uc: Unknown support
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| 274 | // kaios: Unknown support
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| 275 | node: [12, 0]
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| 276 | }),
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| 277 |
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| 278 | browser: browserProperty,
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| 279 | electron: false,
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| 280 | node: nodeProperty,
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| 281 | nwjs: false,
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| 282 | web: browserProperty,
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| 283 | webworker: false,
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| 284 |
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| 285 | document: browserProperty,
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| 286 | fetchWasm: browserProperty,
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| 287 | global: nodeProperty,
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| 288 | importScripts: false,
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| 289 | importScriptsInWorker: true,
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| 290 | nodeBuiltins: nodeProperty,
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| 291 | require: nodeProperty
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| 292 | };
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| 293 | };
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| 294 |
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| 295 | module.exports = {
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| 296 | resolve,
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| 297 | load
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| 298 | };
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