Начальная структура директорий, каркас проекта

server/config/application_env

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+development

server/config/base.js

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+const path = require('path');
+const pckg = require('../../package.json');
+
+const execDir = path.resolve(__dirname, '..');
+const dataDir = `${execDir}/.${pckg.name}/data`;
+
+module.exports = {
+    branch: 'unknown',
+    version: pckg.version,
+    name: pckg.name,
+
+    dataDir,
+    tempDir: `${dataDir}/tmp`,
+    logDir: `${dataDir}/log`,
+    publicDir: `${dataDir}/public`,
+
+    loggingEnabled: true,
+
+    maxFilesDirSize: 1024*1024*1024,//1Gb
+
+    webConfigParams: ['name', 'version', 'branch'],
+
+    server: {
+        ip: '0.0.0.0',
+        port: '22380',
+    },
+};
+

server/config/development.js

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+const base = require('./base');
+
+module.exports = Object.assign({}, base, {
+    branch: 'development',
+});

server/config/index.js

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+const _ = require('lodash');
+const fs = require('fs-extra');
+
+const branchFilename = __dirname + '/application_env';
+
+const propsToSave = [
+    'loggingEnabled',
+    'maxFilesDirSize',
+    'server',
+];
+
+let instance = null;
+
+//singleton
+class ConfigManager {
+    constructor() {    
+        if (!instance) {
+            this.inited = false;
+
+            instance = this;
+        }
+
+        return instance;
+    }
+
+    async init() {
+        if (this.inited)
+            throw new Error('already inited');
+
+        this.branch = 'production';
+        try {
+            await fs.access(branchFilename);
+            this.branch = (await fs.readFile(branchFilename, 'utf8')).trim();
+        } catch (err) {
+            //
+        }
+
+        process.env.NODE_ENV = this.branch;
+
+        this.branchConfigFile = __dirname + `/${this.branch}.js`;
+        this._config = require(this.branchConfigFile);
+
+        await fs.ensureDir(this._config.dataDir);
+        this._userConfigFile = `${this._config.dataDir}/config.json`;
+
+        this.inited = true;
+    }
+
+    get config() {
+        if (!this.inited)
+            throw new Error('not inited');
+        return _.cloneDeep(this._config);
+    }
+
+    set config(value) {
+        Object.assign(this._config, value);
+    }
+
+    get userConfigFile() {
+        return this._userConfigFile;
+    }
+
+    set userConfigFile(value) {
+        if (value)
+            this._userConfigFile = value;
+    }
+
+    async load() {
+        if (!this.inited)
+            throw new Error('not inited');
+        if (!await fs.pathExists(this.userConfigFile)) {
+            await this.save();
+            return;
+        }
+
+        const data = await fs.readFile(this.userConfigFile, 'utf8');
+        this.config = JSON.parse(data);
+    }
+
+    async save() {
+        if (!this.inited)
+            throw new Error('not inited');
+
+        const dataToSave = _.pick(this._config, propsToSave);
+        await fs.writeFile(this.userConfigFile, JSON.stringify(dataToSave, null, 4));
+    }
+}
+
+module.exports = ConfigManager;

server/config/production.js

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+const path = require('path');
+const pckg = require('../../package.json');
+const base = require('./base');
+
+const execDir = path.dirname(process.execPath);
+const dataDir = `${execDir}/.${pckg.name}/data`;
+
+module.exports = Object.assign({}, base, {
+    branch: 'production',
+    dataDir,
+    tempDir: `${dataDir}/tmp`,
+    logDir: `${dataDir}/log`,
+    publicDir: `${dataDir}/public`,
+
+    server: {
+        ip: '0.0.0.0',
+        port: '12380',
+    },
+
+});