Class BaseExporter`Abstract`

Base class for all exporters Provides common functionality for data processing, sampling, and column handling

Hierarchy (View Summary)

BaseExporter

Index

Constructors

Properties

Methods

applySampling calendarDay deriveColumns export extractRowValues formatColumnName formatValue getFileExtension getFullFileName getMimeType

Constructors

constructor

new BaseExporter(options?: Partial<ExportOptions>): BaseExporter
Parameters
- options: Partial<ExportOptions> = {}
Returns BaseExporter
- Defined in base-exporter.ts:10

Properties

`Protected`options

options: ExportOptions

Methods

`Protected`applySampling

applySampling(data: ExportData): ExportData
Apply sampling to data based on options
Parameters
- data: ExportData
Returns ExportData
- Defined in base-exporter.ts:75

`Protected`calendarDay

calendarDay(value: unknown): string
The calendar day a date-only value stores, as ISO 8601 YYYY-MM-DD, or null when it names none.

A SQL date arrives as a Date at UTC midnight or as its ISO string, so the day is read from the UTC parts or the leading YYYY-MM-DD of the string — never from local getters, which give the previous day for anyone west of Greenwich.

A leading YYYY-MM-DD that is not a real day (2026-13-45, 2026-02-30) names none: trusted, it wrote "Invalid Date" or rolled over to another day (2026-03-02). The caller writes the original value instead.
Parameters
- value: unknown
Returns string
- Defined in base-exporter.ts:209

`Protected`deriveColumns

deriveColumns(data: ExportData): ExportColumn[]
Derive columns from data if not explicitly provided
Parameters
- data: ExportData
Returns ExportColumn[]
- Defined in base-exporter.ts:34

`Abstract`export

export(data: ExportData): Promise<ExportResult>
Export data to the target format
Parameters
- data: ExportData
  Array of data objects or arrays to export
Returns Promise<ExportResult>
Export result with buffer and metadata
- Defined in base-exporter.ts:19

`Protected`extractRowValues

extractRowValues(row: ExportDataRow, columns: ExportColumn[]): unknown[]
Extract row values in column order
Parameters
- row: ExportDataRow
- columns: ExportColumn[]
Returns unknown[]
- Defined in base-exporter.ts:145

`Protected`formatColumnName

formatColumnName(name: string): string
Format a column name for display (e.g., "firstName" -> "First Name")
Parameters
- name: string
Returns string
- Defined in base-exporter.ts:63

`Protected`formatValue

formatValue(value: unknown, column: ExportColumn): unknown
Format a cell value based on column type
Parameters
- value: unknown
- column: ExportColumn
Returns unknown
- Defined in base-exporter.ts:159

`Abstract`getFileExtension

getFileExtension(): string
Get the file extension for this export format

Returns string
- Defined in base-exporter.ts:29

`Protected`getFullFileName

getFullFileName(): string
Generate the full file name with extension

Returns string
- Defined in base-exporter.ts:225

`Abstract`getMimeType

getMimeType(): string
Get the MIME type for this export format

Returns string
- Defined in base-exporter.ts:24