1 | 'use strict';
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2 | const browserslist = require('browserslist');
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3 | const { compare, has } = require('./helpers');
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4 | const external = require('./external');
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5 |
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6 | const aliases = new Map([
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7 | ['and_chr', 'chrome'],
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8 | ['and_ff', 'firefox'],
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9 | ['ie_mob', 'ie'],
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10 | ['ios_saf', 'ios'],
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11 | ['op_mob', 'opera_mobile'],
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12 | ]);
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13 |
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14 | const validTargets = new Set([
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15 | 'android',
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16 | 'chrome',
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17 | 'deno',
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18 | 'edge',
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19 | 'electron',
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20 | 'firefox',
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21 | 'ie',
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22 | 'ios',
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23 | 'node',
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24 | 'opera',
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25 | 'opera_mobile',
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26 | 'phantom',
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27 | 'rhino',
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28 | 'safari',
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29 | 'samsung',
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30 | ]);
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31 |
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32 | module.exports = function (targets) {
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33 | if (typeof targets != 'object' || Array.isArray(targets)) {
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34 | targets = { browsers: targets };
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35 | }
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36 |
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37 | const { browsers, esmodules, node, ...rest } = targets;
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38 | const list = Object.entries(rest);
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39 |
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40 | if (browsers) {
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41 | if (typeof browsers == 'string' || Array.isArray(browsers)) {
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42 | list.push(...browserslist(browsers).map(it => it.split(' ')));
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43 | } else {
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44 | list.push(...Object.entries(browsers));
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45 | }
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46 | }
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47 | if (esmodules) {
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48 | list.push(...Object.entries(external.modules));
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49 | }
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50 | if (node) {
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51 | list.push(['node', node === 'current' ? process.versions.node : node]);
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52 | }
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53 |
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54 | const normalized = list.map(([engine, version]) => {
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55 | if (has(browserslist.aliases, engine)) {
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56 | engine = browserslist.aliases[engine];
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57 | }
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58 | if (aliases.has(engine)) {
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59 | engine = aliases.get(engine);
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60 | }
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61 | return [engine, String(version)];
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62 | }).filter(([engine]) => {
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63 | return validTargets.has(engine);
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64 | }).sort(([a], [b]) => {
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65 | return a < b ? -1 : a > b ? 1 : 0;
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66 | });
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67 |
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68 | const reducedByMinVersion = new Map();
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69 | for (const [engine, version] of normalized) {
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70 | if (!reducedByMinVersion.has(engine) || compare(version, '<=', reducedByMinVersion.get(engine))) {
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71 | reducedByMinVersion.set(engine, version);
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72 | }
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73 | }
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74 |
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75 | return reducedByMinVersion;
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76 | };
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