@gvray/logger

---

@gvray/logger / conditionalMiddleware

Function: conditionalMiddleware()

conditionalMiddleware(condition, middleware): LogMiddleware

Defined in: middleware/conditional.ts:23

Middleware that applies another middleware only when a condition holds.

When condition(ctx) returns true, the wrapped middleware runs; the log is always forwarded (via next()) regardless of the condition.

Parameters

condition

(ctx) => boolean

Predicate evaluated against each log context.

middleware

LogMiddleware

Middleware to apply when the condition is true.

Returns

LogMiddleware

A LogMiddleware instance.

Example

logger.use(
  conditionalMiddleware(
    (ctx) => ctx.level >= LogLevel.ERROR,
    prefixMiddleware('🚨 ALERT'),
  ),
);