LocalConfigFile.ts

import * as fs from 'fs';
import JSON5   from 'json5';


class LocalConfigFile {
    private readonly folder: string;
    private readonly filename: string;

    constructor(folder: string, filename: string) {
        this.folder = folder;
        this.filename = filename;

        this.loadConfig();
    }

    private get configPath(): string {
        return `${ this.folder }/${ this.filename }`;
    }

    private _config: { [key: string]: unknown } = {};

    loadConfig() {
        if ( !fs.existsSync(this.configPath) ) {
            fs.mkdirSync(this.folder, { recursive: true });

            fs.writeFileSync(this.configPath, JSON5.stringify({}));
        }

        try {
            this._config = JSON5.parse(fs.readFileSync(this.configPath).toString());
        } catch ( error ) {
            console.log(error);
        }
    }

    getParam(key: string): unknown {
        const value = key in this._config ? this._config[key] : null;
        if ( value === null ) {
            return null;
        } else if ( typeof value === 'object' ) {
            return { ...value };
        } else {
            return value;
        }
    }

    setParam(key: string, value: unknown): void {
        const previousValue = this.getParam(key);
        if ( JSON5.stringify(previousValue) === JSON5.stringify(value) ) {
            return;
        }

        this._config[key] = value;

        try {
            fs.writeFileSync(this.configPath, JSON5.stringify(this._config, null, 4));
        } catch ( error ) {
            console.log(error);
        }
    }
}


export default LocalConfigFile;