# `zappier/reports`

**Package:** `zappier`  
**Source:** `packages/zappier/src/reports.ts`  
**Lines:** 99

## What this module is

Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).

## Exports

`BillingRow`, `billingRows`, `TrendPoint`, `usageTrend`, `CsvColumn`, `toCsv`

## Types / interfaces / classes

| Kind | Name |
|------|------|
| interface | `BillingRow` |
| interface | `TrendPoint` |
| interface | `CsvColumn` |

## Functions

| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
|------|------------|---------------------|---------|-----------------------------|
| `billingRows` | `args: {
  entries: UsageEntry[];
  customers: Customer[];
  tiers: TierConfig[];
  from?: Date;
  to?: Date;
  customerId?: string;
  billingType?: BillingType;
}` | — | `unknown` | see Call graph |
| `usageTrend` | `entries: UsageEntry[], bucket: 'day' \| 'week'` | — | `unknown` | see Call graph |
|  | _Day bucket: YYYY-MM-DD. Week bucket: the Monday (UTC) of that week, YYYY-MM-DD._ | | | |

## What it imports / requires

- `./auth`
- `./pricing`
- `./usage`

## Call graph (identifiers invoked)

`billingRows`, `filter`, `map`, `reduce`, `find`, `min`, `usageTrend`, `setUTCHours`, `getUTCDay`, `setUTCDate`, `getUTCDate`, `toISOString`, `slice`, `key`, `get`, `set`, `values`, `sort`, `localeCompare`, `test`, `replace`, `cell`, `join`, `push`

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`.