(init): Add initial logger files.

src/Logger.ts

@@ -0,0 +1,44 @@
+import LogLevel from './typings/LogLevel';
+import Transport from './typings/Transport';
+
+export class Logger {
+  private transports: Transport[];
+
+  constructor(transports: Transport[] = []) {
+    this.transports = transports;
+  }
+
+  async log(level: LogLevel, module: string, content: string): Promise<void> {
+    const tasks: Promise<void>[] = [];
+
+    for (const transport of this.transports) {
+      if (level >= transport.minLevel) {
+        tasks.push(transport.log(level, module, content));
+      }
+    }
+
+    await Promise.all(tasks);
+  }
+
+  debug(module: string, content: string) {
+    return this.log(LogLevel.Debug, module, content);
+  }
+
+  info(module: string, content: string) {
+    return this.log(LogLevel.Information, module, content);
+  }
+
+  warn(module: string, content: string) {
+    return this.log(LogLevel.Warning, module, content);
+  }
+
+  error(module: string, content: string) {
+    return this.log(LogLevel.Error, module, content);
+  }
+
+  fatal(module: string, content: string) {
+    return this.log(LogLevel.Fatal, module, content);
+  }
+}
+
+export default Logger;

src/index.ts

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+export * from './Logger';
+export * from './typings/LogLevel';
+export * from './typings/Transport';

src/typings/LogLevel.ts

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+enum LogLevel {
+  Debug,
+  Information,
+  Warning,
+  Error,
+  Fatal,
+}
+
+export default LogLevel;

src/typings/Transport.ts

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+import LogLevel from './LogLevel';
+
+interface Transport {
+  minLevel: LogLevel;
+
+  /**
+   *
+   * @param level The logging level.
+   * @param module The name of the module. This is defined when logging.
+   * @param content The content of the module.
+   */
+  log(level: LogLevel, module: string, content: string): Promise<void>;
+}
+
+export default Transport;