# `verae-zapier-middleware/debug/logger`

**Package:** `verae-zapier-middleware`  
**Source:** `packages/verae-zapier-middleware/src/debug/logger.js`  
**Lines:** 122

## What this module is

Implementation module in `verae-zapier-middleware`. The tables below are extracted from the source (signatures + JSDoc).

## Exports

`setDebugTestSink`, `formatLogLine`, `createDebugger`

## Types / interfaces / classes

_None extracted._

## Functions

| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
|------|------------|---------------------|---------|-----------------------------|
| `setDebugTestSink` | `sink` | sink: `null|((line: string) => void)` | `void` | see Call graph |
| `formatLogLine` | `{ level, namespace, message, meta, traceId }` | parts: `object`, parts.level: `string`, parts.namespace: `string`, parts.message: `string`, parts.meta: `Record<string, unknown>|undefined`, parts.traceId: `string|null` | `string` | see Call graph |
| `emit` | `line, filePath` | line: `string`, filePath: `string|null` | `void` | see Call graph |
| `createDebugger` | `namespace` | namespace: `string` | `Debugger` — Logger with debug/info/warn/error methods. | see Call graph |
| `write` | `level, message, meta` | level: `'debug'|'info'|'warn'|'error'`, message: `string`, meta: `Record<string, unknown>` | `unknown` | see Call graph |

## What it imports / requires

- `node:fs`
- `./config.js`
- `./redact.js`
- `./trace-context.js`

## Call graph (identifiers invoked)

`setDebugTestSink`, `formatLogLine`, `toISOString`, `keys`, `stringify`, `redact`, `toUpperCase`, `emit`, `testSink`, `error`, `appendFileSync`, `createDebugger`, `debug`, `toLowerCase`, `write`, `loadDebugConfig`, `shouldLog`, `getTraceId`

Each identifier is a call site in this file. Follow the import list to see the defining module; open that module’s MD for parameter and return types.

## Return values (how to read this)

- HTTP route handlers return Express `res.json(...)` bodies (see route docs).
- Zapier `perform` functions return a **single object** (creates) or an **array** (triggers/searches).
- Pricing functions return integer **cents** on `Quote.totalCents`.