Interface: Logger#

Defined in: packages/typescript/ai/src/logger/types.ts:4

Pluggable logger interface consumed by every @tanstack/ai activity when debug is enabled. Supply a custom implementation via debug: { logger } on chat(), summarize(), generateImage(), etc. The four methods correspond to log levels: use debug for chunk-level diagnostic output, info/warn for notable events, error for caught exceptions.

Properties#

debug()#

debug: (message, meta?) => void;

debug: (message, meta?) => void;

Defined in: packages/typescript/ai/src/logger/types.ts:9

Called for chunk-level diagnostic output (raw provider chunks, per-chunk output, agent-loop iteration markers).

Parameters#

message#

string

meta?#

Record<string, unknown>

Structured data forwarded to the underlying logger. Loggers like pino will preserve this as a structured record; console-based loggers pass it as the second argument to console.<level>.

Returns#

void

error()#

error: (message, meta?) => void;

error: (message, meta?) => void;

Defined in: packages/typescript/ai/src/logger/types.ts:24

Called for caught exceptions throughout the pipeline.

Parameters#

message#

string

meta?#

Record<string, unknown>

Structured data forwarded to the underlying logger. Loggers like pino will preserve this as a structured record; console-based loggers pass it as the second argument to console.<level>.

Returns#

void

info()#

info: (message, meta?) => void;

info: (message, meta?) => void;

Defined in: packages/typescript/ai/src/logger/types.ts:14

Called for notable informational events (outgoing requests, tool invocations, middleware transitions).

Parameters#

message#

string

meta?#

Record<string, unknown>

Structured data forwarded to the underlying logger. Loggers like pino will preserve this as a structured record; console-based loggers pass it as the second argument to console.<level>.

Returns#

void

warn()#

warn: (message, meta?) => void;

warn: (message, meta?) => void;

Defined in: packages/typescript/ai/src/logger/types.ts:19

Called for notable warnings that don't halt execution (deprecations, recoverable anomalies).

Parameters#

message#

string

meta?#

Record<string, unknown>

Structured data forwarded to the underlying logger. Loggers like pino will preserve this as a structured record; console-based loggers pass it as the second argument to console.<level>.

Returns#

void