caniuse-support/cjs/support.js

Query the caniuse offline database for feature support.

"use strict";
/**
 * @license
 * Copyright (C) 2016 Chi Vinh Le and contributors.
 *
 * This software may be modified and distributed under the terms
 * of the MIT license. See the LICENSE file for details.
 */
Object.defineProperty(exports, "__esModule", { value: true });
var lite = require("caniuse-lite");
/**
 * Query the caniuse database for feature support.
 *
 * @param {String} feature see full list https://github.com/Fyrd/caniuse/tree/master/features-json.
 * @param {{id: string; version: string}} browser
 */
function getSupport(feature, browser) {
    var support = { level: "unknown", needPrefix: false, notes: [] };
    var stats = lite.feature(require("caniuse-lite/data/features/" + feature + ".js")).stats[browser.id];
    if (!stats) {
        return support;
    }
    var versionIdx = getVersionIndex(browser);
    if (versionIdx) {
        var value = stats[versionIdx];
        if (value.indexOf("y") !== -1) {
            support.level = "full";
        }
        else if (value.indexOf("a") !== -1) {
            support.level = "partial";
        }
        else {
            support.level = "none";
        }
        support.needPrefix = value.indexOf("x") !== -1;
        value.split(" ").forEach(function (s) {
            if (s === "y") {
                support.level = "full";
            }
            else if (s === "a") {
                support.level = "partial";
            }
            else if (s[0] === "#") {
                support.notes.push(parseInt(s.substr(1), 10));
            }
        });
    }
    return support;
}
exports.getSupport = getSupport;
/**
 * Get matching browser version index of the caniuse db.
 * Will return last known version index if target version > any known versions.
 * Returns an empty string if target version < any known versions.
 *
 * @param {{id: string; version: string}} browser
 */
function getVersionIndex(browser) {
    var targetVersion = parseFloat(browser.version);
    var stats = lite.feature(require("caniuse-lite/data/features/css-appearance.js")).stats[browser.id];
    if (!stats) {
        return "";
    }
    // Sorted contains a list with sorted version numbers.
    var sorted = Object.keys(stats).sort(function (a, b) { return parseFloat(a) - parseFloat(b); });
    // At the end of this loop, match contains the closest matching version.
    var match = "";
    for (var _i = 0, sorted_1 = sorted; _i < sorted_1.length; _i++) {
        var v = sorted_1[_i];
        var from = v.split("-").map(function (x) { return parseFloat(x); })[0];
        if (isNaN(from)) {
            match = v.split("-")[0];
            break;
        }
        if (targetVersion >= from) {
            match = v;
        }
        else {
            break;
        }
    }
    return match;
}
exports.getVersionIndex = getVersionIndex;

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