# All files / core/use-cases scan-files.ts

92% Statements 23/25
66.67% Branches 4/6
88.89% Functions 8/9
91.67% Lines 22/24

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     import * as path from 'path';

    const DEFAULT_EXCLUDED_DIRECTORIES = ['.git', 'node_modules'];

    /**
     * Handle scan source code
     */
    export class ScanFile {
        private static instance: ScanFile;

        private scannedFiles: string[] = [];

        private constructor() {}

        public static getInstance() {
            Eif (!ScanFile.instance) {
                ScanFile.instance = new ScanFile();
            }
            return ScanFile.instance;
        }

        public async scan(folder: string): Promise<string[]> {
            return new Promise<string[]>((resolve, reject) => {
                const finder = require('findit2')(path.resolve(folder));

                finder.on('directory', function(dir, stat, stop) {
                    let base = path.basename(dir);
                    Iif (DEFAULT_EXCLUDED_DIRECTORIES.includes(base)) {
                        stop();
                    }
                });

                finder.on('error', error => {
                    reject(error);
                });

                finder.on('file', (file, stat) => {
                    if (path.extname(file) === '.ts') {
                        this.scannedFiles.push(file);
                    }
                });

                finder.on('end', () => {
                    resolve(this.scannedFiles);
                });
            });
        }
    }

    export default ScanFile.getInstance();