forked from babel/babel
/
build-modules-support.js
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/
build-modules-support.js
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const path = require("path");
const fs = require("fs");
const compatData = require("@mdn/browser-compat-data").javascript;
const { addElectronSupportFromChromium } = require("./chromium-to-electron");
// Map mdn-browser-compat-data to browserslist browser names
const browserNameMap = {
chrome_android: "and_chr",
firefox_android: "and_ff",
safari_ios: "ios",
nodejs: "node",
webview_android: "android",
opera_android: "op_mob",
samsunginternet_android: "samsung",
};
const browserSupportMap = {
android: "chrome_android", // map to chrome here as Android WebView 61 is Chromium-based
};
function browserVersion(browser, version_added) {
if (browser === "samsunginternet_android" && version_added === "8.0") {
return "8.2"; // samsung 8.0 is not defined in browserslist
}
// fixme: preset-env maps opera_android as opera, this is incorrect as they have different engine mappings
// see https://github.com/mdn/browser-compat-data/blob/master/browsers/opera_android.json
if (browser === "opera_android" && version_added === "45") {
return "48";
}
return version_added;
}
function process(source) {
const stats = source.__compat.support;
const allowedBrowsers = {};
Object.keys(stats).forEach(browser => {
const browserName = browserNameMap[browser] || browser;
let browserSupport = stats[browserSupportMap[browserName] || browser];
if (Array.isArray(browserSupport)) {
browserSupport = browserSupport[0]; // The first item is the most progressive support
}
if (
browserSupport.version_added &&
!browserSupport.flags &&
!browserSupport.partial_implementation
) {
allowedBrowsers[browserName] = browserVersion(
browser,
browserSupport.version_added
);
}
});
addElectronSupportFromChromium(allowedBrowsers);
return allowedBrowsers;
}
const dataPath = path.join(__dirname, "../data/native-modules.json");
const processed = process(compatData.statements.export);
// Todo(Babel 8): remove `ios_saf` as it is identical to ios
if (processed.ios) {
processed.ios_saf = processed.ios;
}
const data = {
"es6.module": processed,
};
fs.writeFileSync(dataPath, `${JSON.stringify(data, null, 2)}\n`);
exports.process = process;