Initial 1.0.0 commit (library extracted from existing project).

src/log-service.ts

@@ -0,0 +1,48 @@
+import { LogLevel } from './log-message';
+import Logger from './logger';
+
+const ROOT_LOGGER_NAME = 'ROOT';
+
+export class LogService {
+  private loggers: { [key: string]: Logger };
+
+  public get ROOT_LOGGER() {
+    return this.loggers[ROOT_LOGGER_NAME];
+  }
+
+  public constructor() {
+    this.loggers = {};
+    this.loggers[ROOT_LOGGER_NAME] = new Logger(
+      ROOT_LOGGER_NAME,
+      undefined,
+      LogLevel.ALL
+    );
+  }
+
+  public getLogger(name: string, threshold?: LogLevel): Logger {
+    if (this.loggers[name]) {
+      return this.loggers[name];
+    }
+
+    let parentLogger: Logger;
+
+    const parentLoggerName = Object.keys(this.loggers)
+      .filter((n: string) => name.startsWith(n))
+      .reduce(
+        (acc: string, cur: string) => (acc.length > cur.length ? acc : cur),
+        ''
+      );
+
+    if (parentLoggerName) {
+      parentLogger = this.loggers[parentLoggerName];
+    } else {
+      parentLogger = this.ROOT_LOGGER;
+    }
+
+    this.loggers[name] = parentLogger.createChildLogger(name, threshold);
+    return this.loggers[name];
+  }
+}
+
+export const logService = new LogService();
+export default logService;