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@ironsheet/core

v0.1.0

Published

8 days ago

Lossless TypeScript OOXML workbook engine for editing real XLSX and XLSM files.

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excel xlsx xlsm ooxml spreadsheet template lossless typescript workbook

The runtime-neutral workbook engine at the heart of Ironsheet — the lossless TypeScript engine for editing real XLSX and XLSM files without breaking formulas, styles, charts, pivots, macros, or layout.

This package is dependency-free and browser-compatible. It contains the ZIP/OPC/XML primitives, validators, and lossless mutation APIs. Runtime-specific file IO and compression live in the adapter packages:

@ironsheet/node — Node filesystem IO, zlib, safe writes, template rendering.
@ironsheet/browser — Blob/File/ArrayBuffer and CompressionStream adapters.

Most applications should install an adapter rather than this package directly.

Install

npm install @ironsheet/core

What it does

Parses and writes OOXML ZIP packages with raw compressed-payload preservation.
Preserves unknown workbook XML, styles, drawings, charts, pivots, comments, merged cells, defined names, validations, conditional formats, images, and XLSM macro parts.
Patches cells, ranges, named ranges, tables, images, styles, and more — with Excel-equivalent reference rewriting on row/sheet edits.
Diffs two workbooks semantically and validates the OOXML package before a write.

Documentation

See the Ironsheet monorepo for the full API guide, capabilities, and design principles.

License