knip/dist/util/parse-and-convert-gitignores.js

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export const convertGitignoreToPicomatchIgnorePatterns = (pattern) => {
    const negated = pattern[0] === '!';
    if (negated)
        pattern = pattern.slice(1);
    let extPattern;
    if (pattern.endsWith('/'))
        pattern = pattern.slice(0, -1);
    if (pattern.startsWith('*/**/'))
        pattern = pattern.slice(5);
    if (pattern.startsWith('/'))
        pattern = pattern.slice(1);
    else if (!pattern.startsWith('**/'))
        pattern = `**/${pattern}`;
    if (pattern.endsWith('/*'))
        extPattern = pattern;
    else
        extPattern = `${pattern}/**`;
    return { negated, patterns: [pattern, extPattern] };
};
export const parseAndConvertGitignorePatterns = (patterns, ancestor) => {
    const matchFrom = ancestor ? new RegExp(`^(!?/?)(${ancestor})`) : undefined;
    return patterns
        .split(/\r?\n/)
        .filter(line => line.trim() && !line.startsWith('#'))
        .flatMap(line => {
        const pattern = line.replace(/^\\(?=#)/, '').trim();
        if (ancestor && matchFrom) {
            if (pattern.match(matchFrom))
                return [pattern.replace(matchFrom, '$1')];
            if (pattern.startsWith('/**/'))
                return [pattern.slice(1)];
            if (pattern.startsWith('!/**/'))
                return [`!${pattern.slice(2)}`];
            if (pattern.startsWith('/') || pattern.startsWith('!/'))
                return [];
        }
        return [pattern];
    })
        .map(pattern => convertGitignoreToPicomatchIgnorePatterns(pattern));
};