initial

demo.js

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+import Logger from './lib/logger.ts';
+const logger = new Logger({ level: 'debug' });
+
+logger.error('Unable to fetch student');
+logger.info('Hello from logger');
+logger.warn('This is a warning');
+logger.debug('This is a debug message'); // This won't be logged if level is set to 'info'
+logger.level('error');
+logger.debug('This is a debug message'); // This won't be logged if level is set to 'info' or higher
+
+const simple_logger = new Logger({ level: 'debug', format: 'simple' });
+
+simple_logger.error('Unable to fetch student');
+simple_logger.info('Hello from logger');
+simple_logger.warn('This is a warning');
+simple_logger.debug('This is a debug message'); // This won't be logged if level is set to 'info'
+simple_logger.level('error');
+simple_logger.debug('This is a debug message'); // This won't be logged if level is set to 'info' or higher
+
+const longLogger = new Logger({ time: 'long', format: 'simple' });
+const shortLogger = new Logger({ time: 'short', format: 'simple' });
+
+longLogger.info('This uses long time format');
+shortLogger.info('This uses short time format');
+
+// Demonstrate callerLevel functionality
+console.log('\n=== Caller Level Demo ===');
+
+// Default callerLevel is 'warn' - only errors and warnings include caller info
+const defaultCallerLogger = new Logger({ format: 'simple' });
+console.log(
+  'Default callerLevel (warn) - only errors and warnings show caller info:'
+);
+defaultCallerLogger.error('Error with caller info');
+defaultCallerLogger.warn('Warning with caller info');
+defaultCallerLogger.info('Info without caller info');
+defaultCallerLogger.debug('Debug without caller info');
+
+// Set callerLevel to 'error' - only errors include caller info
+const errorOnlyLogger = new Logger({ format: 'simple', callerLevel: 'error' });
+console.log('\nCallerLevel set to error - only errors show caller info:');
+errorOnlyLogger.error('Error with caller info');
+errorOnlyLogger.warn('Warning without caller info');
+errorOnlyLogger.info('Info without caller info');
+
+// Set callerLevel to 'debug' - all levels include caller info
+const allLevelsLogger = new Logger({ format: 'simple', callerLevel: 'debug' });
+console.log('\nCallerLevel set to debug - all levels show caller info:');
+allLevelsLogger.error('Error with caller info');
+allLevelsLogger.warn('Warning with caller info');
+allLevelsLogger.info('Info with caller info');
+allLevelsLogger.debug('Debug with caller info');
+
+// Set callerLevel to 'silent' - no levels include caller info
+const noneLogger = new Logger({ format: 'simple', callerLevel: 'silent' });
+console.log('\nCallerLevel set to silent - no levels show caller info:');
+noneLogger.error('Error without caller info');
+noneLogger.warn('Warning without caller info');
+noneLogger.info('Info without caller info');
+
+// Demonstrate format string functionality (util.format style)
+console.log('\n=== Format String Demo ===');
+
+const formatLogger = new Logger({ format: 'simple', level: 'debug' });
+console.log('Format strings with various specifiers:');
+
+// String formatting (%s)
+formatLogger.info('User %s logged in successfully', 'john_doe');
+
+// Number formatting (%d, %i, %f)
+formatLogger.warn('Database has %d connections, CPU usage: %f%%', 25, 84.3);
+formatLogger.debug('Processing item %i of %d', 42, 100);
+
+// JSON formatting (%j)
+const user = { name: 'Alice', role: 'admin', active: true };
+const config = { timeout: 5000, retries: 3 };
+formatLogger.info('User data: %j, Config: %j', user, config);
+
+// Mixed formatting
+formatLogger.error('API call failed for user %s (ID: %d) with config %j', 'bob', 1234, config);
+
+// Multiple arguments without format specifiers
+formatLogger.warn('System alert:', 'High memory usage detected', { usage: '89%', threshold: '80%' });
+
+// Literal percentage with %%
+formatLogger.info('Upload progress: 50%% complete');
+
+// Edge cases
+formatLogger.debug('Values: %s, %s, %d', null, undefined, null);
+
+console.log('\nJSON format with same messages:');
+const jsonFormatLogger = new Logger({ format: 'json' });
+jsonFormatLogger.info('User %s logged in with %d failed attempts', 'alice', 2);
+jsonFormatLogger.warn('Config loaded: %j', { env: 'production', debug: false });