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import { OFF_LOGGER } from './off-logger.ts';
/**
* Creates a new logger that forwards all log entries to the provided loggers.
*
* The returned logger (a "tee") behaves like a standard logger but duplicates every log operation to each of the
* underlying loggers.
*
* ### Log level synchronization
*
* - When the tee logger is created, its `level` is synchronized with the first logger.
* - When the tee logger's `level` is updated, it updates all underlying loggers.
* - However, the tee does **not actively keep levels in sync** after that point.
*
* Clients should avoid changing the log level on the individual loggers after teeing, as this may lead to inconsistent
* filtering behavior across outputs.
*
* @example
*
* ```ts
* const logger = tee(consoleLogger, fileLogger);
* logger.info('This will be logged to both console and file');
* ```
*
* @param loggers One or more loggers to combine.
* @returns A new logger that fans out logs to the provided loggers. Returns the 'off logger' if loggers is empty or the
* specified logger is loggers length is one.
*/
export const tee = (...loggers: readonly Logger[]): Logger => {
if (!loggers.length) {
return OFF_LOGGER;
}
if (loggers.length === 1) {
return loggers[0];
}
// Track pending args for the tee logger
let pendingArgs: unknown[] = [];
// Helper to consume pending args similar to BaseLogger
const consumePendingArgs = (): readonly unknown[] | undefined => {
if (!pendingArgs.length) {
return undefined;
}
const args = pendingArgs;
pendingArgs = [];
return args;
};
return {
get level() {
return loggers[0].level;
},
set level(newLevel: LogLevel | 'off') {
for (const logger of loggers) {
logger.level = newLevel;
}
},
args(...args: unknown[]): Logger {
// Store args locally instead of forwarding immediately
pendingArgs = args;
return this;
},
trace(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).trace(message, ...args);
} else {
logger.trace(message, ...args);
}
}
},
t(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).t(strings, ...values);
} else {
logger.t(strings, ...values);
}
}
},
debug(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).debug(message, ...args);
} else {
logger.debug(message, ...args);
}
}
},
d(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).d(strings, ...values);
} else {
logger.d(strings, ...values);
}
}
},
info(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).info(message, ...args);
} else {
logger.info(message, ...args);
}
}
},
i(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).i(strings, ...values);
} else {
logger.i(strings, ...values);
}
}
},
notice(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).notice(message, ...args);
} else {
logger.notice(message, ...args);
}
}
},
n(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).n(strings, ...values);
} else {
logger.n(strings, ...values);
}
}
},
warning(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).warning(message, ...args);
} else {
logger.warning(message, ...args);
}
}
},
w(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).w(strings, ...values);
} else {
logger.w(strings, ...values);
}
}
},
error(message: LogMessage | Error | { error: unknown }, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).error(message, ...args);
} else {
logger.error(message, ...args);
}
}
},
e(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).e(strings, ...values);
} else {
logger.e(strings, ...values);
}
}
},
critical(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).critical(message, ...args);
} else {
logger.critical(message, ...args);
}
}
},
c(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).c(strings, ...values);
} else {
logger.c(strings, ...values);
}
}
},
alert(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).alert(message, ...args);
} else {
logger.alert(message, ...args);
}
}
},
a(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).a(strings, ...values);
} else {
logger.a(strings, ...values);
}
}
},
emergency(message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).emergency(message, ...args);
} else {
logger.emergency(message, ...args);
}
}
},
em(strings: TemplateStringsArray, ...values: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
if (currentArgs) {
logger.args(...currentArgs).em(strings, ...values);
} else {
logger.em(strings, ...values);
}
}
},
log(level: LogLevel, message: LogMessage, ...args: unknown[]): void {
const currentArgs = consumePendingArgs();
for (const logger of loggers) {
Iif (currentArgs) {
logger.args(...currentArgs).log(level, message, ...args);
} else {
logger.log(level, message, ...args);
}
}
},
};
};
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