#@teakit/sheet

A TypeScript toolkit for keyed business sheets (Record<string, readonly T[]>): fixed period sheets, aggregation, rollup/rolldown, and transform/combine helpers. Not a linear-algebra library.

Use the canonical import:

import { Sheet } from "@teakit/sheet";

Do not generate unsupported aliases, constructors, default imports, or compatibility APIs. Sheet is a non-constructable namespace; do not call Sheet(...) or new Sheet(...). Express row/column direction with { by: "rows" | "cols" }, not method-name aliases. "-" (no-data) and undefined (missing) are distinct: aggregation and rollup skip both, but merge/zip/normalize/transpose pass "-" through and never invent it.

For behavior details, open the matching method reference file.

#Table of Contents

#Concepts

• sheet
• period-shapes
• errors

#Creation & Validation

• from
• fromEntries
• clone
• isSheet
• assertSheet

#Period Creation

• range

#Aggregation

• sum
• mean
• median

#Period Transforms

• rollup
• rolldown

#Traversal

• map
• reduce
• entries

#Structure

• normalize
• transpose

#Combine

• merge
• zip

#Conversion

• toObject
• toJSON