* @example {{ readField('jvm', 'files') | nullToEmpty }}
 */
function nullToEmpty(input) {
    let output;
    if (input) {
        output = input;
    } else {
        output = [];
    }
    console.log("nullToEmpty: " + output);
    return output;
}

        console.log("Finished codeowners mapping: " + mapping);

        const result = new Map()
        files.map(f => {
            console.log("Resolving owners for: " + f);
            const owners = resolveCodeowners(mapping, f);
            console.log("Owners for: " + f + " are: " + owners);
            owners.filter(i => typeof i === 'string')
                .map(u => u.replace(/^@gradle\//, ""))

        if (!result.has(platform)) {
            result.set(platform, []);
        }
        result.get(platform).push(file);
    });

    console.log("byPlatform: ");
    [...result.keys()].forEach(platform => {
        console.log("[" + platform + ": [" + result.get(platform).join(", ") + "]]");
    });
    return result;
}

function getPlatform(file) {