* @param {Map} fileOwners mapping of platform name to a list of files involved in the change located in that platform
 * @param {[FileMetadata]} fileMetadatas - gitStream's list of metadata about file changes in the PR including path
 * @returns {[Object]} Returns a list of objects for each platform containing info about the changes to files in that platform
 * @example {{ owners | categorize(branch.diff.files_metadata) }}
 */

        return path => !this.ignores(path)
    }

    filter (paths) {
        return makeArray(paths).filter(this.createFilter())
    }

    // @returns {TestResult}
    test (path) {
        return this._test(path, this._testCache, true)
    }
}

const factory = options => new Ignore(options)

const isPathValid = path =>
    checkPath(path && checkPath.convert(path), path, RETURN_FALSE)

        .map(x => {
            const line = x.trim();
            const [path, ...owners] = line.split(/\s+/);
            return {path, owners};
        });
}

function resolveCodeowners(mapping, file) {
    let match = mapping
        .slice()
        .reverse()
        .find(x =>
            ignore()
                .add(x.path)
                .ignores(file)
        );
    if (!match) {

/**
 * @module byPlatform
 * @description Groups the PR's files by platform based on the file's path.
 * @param {string[]} files - the gitStream's files context variable
 * @returns {Map} - Map from platform to list of files in this PR in it
 * @example {{ owners | byPlatform }}
 */
function byPlatform(files) {
    const result = new Map();
    files.forEach(file => {
        const platform = getPlatform(file);
        if (!result.has(platform)) {

        });
    });

    summaries.forEach(summary => {
        summary.additionPercent = Math.round(summary.additions / (totalAdditions + totalDeletions) * 100, 2);
        summary.deletionPercent = Math.round(summary.deletions / (totalAdditions + totalDeletions) * 100, 2);
        summary.filesPercent = Math.round(summary.files.length / totalChangedFiles * 100, 2);
    });

    console.log("computeStatistics: ");

    let newRatio = totalAdditions / (totalAdditions + totalDeletions) * 100;

    let result = `:bar_chart: **Changes by ${title}: this PR is ${Math.round(newRatio, 2)}% new code**`;

    // Only title by Platform
    if (title === "Platform") {
        result += `
  <br>${platformsAffected(preppedStatistics)}`;
    }

    result += `
  <details>