Initial server code. Building scripts

src/config/.env

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+PORT=5000
+NODE_ENV=development

src/environment.d.ts

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+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      PORT: number;
+      NODE_ENV: string;
+    }
+  }
+}
+
+export {};

src/server.ts

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+import dotenv from 'dotenv';
+import express from 'express';
+import { Logger } from './utils';
+
+// Env config
+dotenv.config({ path: './src/config/.env' });
+
+const app = express();
+const logger = new Logger();
+const PORT = process.env.PORT;
+
+app.listen(PORT, () => {
+  logger.log(
+    `Server is working on port ${PORT} in ${process.env.NODE_ENV} mode`
+  );
+});

src/typescript/types/ErrorLevel.ts

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+export type ErrorLevel = 'INFO' | 'ERROR' | 'WARN';

src/utils/Logger.ts

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+import { ErrorLevel } from '../typescript/types/ErrorLevel';
+
+export class Logger {
+  public log(message: string, level: ErrorLevel = 'INFO'): void {
+    console.log(`[${this.generateTimestamp()}] [${level}] ${message}`);
+  }
+
+  private generateTimestamp(): string {
+    const d = new Date();
+
+    // Date
+    const year = d.getFullYear();
+    const month = this.parseDate(d.getMonth() + 1);
+    const day = this.parseDate(d.getDate());
+
+    // Time
+    const hour = this.parseDate(d.getHours());
+    const minutes = this.parseDate(d.getMinutes());
+    const seconds = this.parseDate(d.getSeconds());
+    const miliseconds = this.parseDate(d.getMilliseconds(), true);
+
+    // Timezone
+    const tz = -d.getTimezoneOffset() / 60;
+
+    // Construct string
+    const timestamp = `${year}-${month}-${day} ${hour}:${minutes}:${seconds}.${miliseconds} UTC${
+      tz >= 0 ? '+' + tz : tz
+    }`;
+
+    return timestamp;
+  }
+
+  private parseDate(dateFragment: number, ms: boolean = false): string {
+    if (ms) {
+      if (dateFragment >= 10 && dateFragment < 100) {
+        return `0${dateFragment}`;
+      } else if (dateFragment < 10) {
+        return `00${dateFragment}`;
+      }
+    }
+
+    return dateFragment < 10 ? `0${dateFragment}` : dateFragment.toString();
+  }
+}

src/utils/index.ts

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+export * from './Logger';