1 | let browserslist = require('browserslist')
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2 | let agents = require('caniuse-lite').agents
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3 |
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4 | let utils = require('./utils')
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5 |
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6 | class Browsers {
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7 | |
8 |
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9 |
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10 | static prefixes() {
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11 | if (this.prefixesCache) {
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12 | return this.prefixesCache
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13 | }
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14 |
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15 | this.prefixesCache = []
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16 | for (let name in agents) {
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17 | this.prefixesCache.push(`-${agents[name].prefix}-`)
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18 | }
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19 |
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20 | this.prefixesCache = utils
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21 | .uniq(this.prefixesCache)
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22 | .sort((a, b) => b.length - a.length)
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23 |
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24 | return this.prefixesCache
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25 | }
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26 |
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27 | |
28 |
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29 |
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30 | static withPrefix(value) {
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31 | if (!this.prefixesRegexp) {
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32 | this.prefixesRegexp = new RegExp(this.prefixes().join('|'))
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33 | }
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34 |
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35 | return this.prefixesRegexp.test(value)
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36 | }
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37 |
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38 | constructor(data, requirements, options, browserslistOpts) {
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39 | this.data = data
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40 | this.options = options || {}
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41 | this.browserslistOpts = browserslistOpts || {}
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42 | this.selected = this.parse(requirements)
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43 | }
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44 |
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45 | |
46 |
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47 |
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48 | parse(requirements) {
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49 | let opts = {}
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50 | for (let i in this.browserslistOpts) {
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51 | opts[i] = this.browserslistOpts[i]
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52 | }
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53 | opts.path = this.options.from
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54 | return browserslist(requirements, opts)
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55 | }
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56 |
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57 | |
58 |
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59 |
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60 | prefix(browser) {
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61 | let [name, version] = browser.split(' ')
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62 | let data = this.data[name]
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63 |
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64 | let prefix = data.prefix_exceptions && data.prefix_exceptions[version]
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65 | if (!prefix) {
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66 | prefix = data.prefix
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67 | }
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68 | return `-${prefix}-`
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69 | }
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70 |
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71 | |
72 |
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73 |
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74 | isSelected(browser) {
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75 | return this.selected.includes(browser)
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76 | }
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77 | }
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78 |
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79 | module.exports = Browsers
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