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// see: https://github.com/Nyalab/caniuse-api/tree/master/src
const memoize = require("lodash.memoize");
const browserslist = require("browserslist");
const {features, feature: featureUnpack} = require("caniuse-lite");
const uniq = require("lodash.uniq");
function contains(str, substr) {
return !!~str.indexOf(substr)
}
function parseCaniuseData(feature, browsers) {
var support = {}
var letters
var letter
browsers.forEach(function(browser) {
support[browser] = {}
for (var info in feature.stats[browser]) {
letters = feature.stats[browser][info].replace(/#\d+/, "").trim().split(" ")
info = parseFloat(info.split("-")[0]) //if info is a range, take the left
if (isNaN(info)) continue
for (var i = 0; i < letters.length ; i++) {
letter = letters[i]
if (letter === "d") { // skip this letter, we don't support it yet
continue
} else if (letter === "y"){ // min support asked, need to find the min value
if (typeof support[browser][letter] === "undefined" ||
info < support[browser][letter]) {
support[browser][letter] = info
}
} else { // any other support, need to find the max value
if (typeof support[browser][letter] === "undefined" ||
info > support[browser][letter]) {
support[browser][letter] = info
}
}
}
}
})
return support
}
function cleanBrowsersList(browserList) {
return uniq(browserslist(browserList).map((browser) => browser.split(" ")[0]))
}
const featuresList = Object.keys(features)
let browsers
function setBrowserScope(browserList) {
browsers = cleanBrowsersList(browserList)
}
const parse = memoize(parseCaniuseData, function(feat, browsers) {
return feat.title + browsers
})
function isSupported(feature, browsers) {
let data
try {
data = featureUnpack(features[feature])
} catch(e) {
let res = find(feature)
if (res.length === 1) {
data = features[res[0]]
} else {
throw new ReferenceError(`Please provide a proper feature name. Cannot find ${feature}`)
}
}
const browserList = browserslist(browsers, {ignoreUnknownVersions: true})
if (browserList && browserList.length > 0) {
return browserList.map((browser) => {
return browser.split(" ")
})
.every((browser) => {
return data.stats[browser[0]] &&
data.stats[browser[0]][browser[1]] &&
data.stats[browser[0]][browser[1]][0] === "y"
})
}
throw new ReferenceError(`browser is an unknown version: ${browsers}`)
}
function find(query) {
if (typeof query !== "string") {
throw new TypeError("The `query` parameter should be a string.")
}
if (~featuresList.indexOf(query)) { // exact match
return query
}
return featuresList.filter((file) => contains(file, query))
}
setBrowserScope()
module.exports = {
isSupported,
}