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