Concepts — Sheetwrite

These pages explain the model under the API: which part owns each piece of state, how the engine recalculates, how a document changes through operations, and how failures reach your code. Read them before you design persistence or collaboration.

Runtime ownership

Understand Sheetwrite runtime, renderer, store, virtualization, and document ownership boundaries.

UpdatedCalculation engine

Understand engine builds, incremental recalculation, spills, paged data, formula errors, volatility, and iteration.

Documents and operations

Understand authoritative workbook snapshots, document operations, storage transactions, and cell inputs.

Error handling

Typed failures, stable codes, recovery paths, event direction, validation, and incomplete-data behavior.

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