• Declare the benchmark chart in pubspec.yaml so pub.dev renders it on the package page. The chart was already in the repository and the README, but pub.dev shows only what the screenshots: field points at, so the page a reader lands on from search opened with text where the measurement should have been.

• Add charts. Workbook.addChart(ChartType) creates a column, bar, line, area, pie, doughnut, scatter, or radar chart; Chart.addSeries plots cell ranges, with setTitle and setAxisNames for labels; Worksheet.insertChart places it on a sheet with optional scaling. The pure-Dart excel and spreadsheet_decoder packages can't write charts, so this is the reason to use a native writer when a report needs one. Charts are wired through the C shim, which is compiled from vendored source, so there is no new binary to install.

• Add Workbook.toBytes: build a workbook and get its .xlsx bytes back with no file left on disk, for serving a generated spreadsheet straight from a request handler. It stages a temporary file, reads it back, and removes it. Supports constant-memory mode via constantMemory: true.

• Add Worksheet.addTable, which wraps a cell range in an Excel table with banded rows, per-column autofilter, and a name usable in formulas. Pass the column names through columns; they are written into the header row. The autofilter, bandedRows, bandedColumns and totalRow options toggle the matching table features.

Changelog #

• Move the vendored third-party attributions out of LICENSE into THIRD_PARTY_NOTICES.md, so LICENSE is the plain MIT text that automated license detection recognises. The attributions themselves are unchanged and still ship with the package.

First release. A native .xlsx writer for Dart, binding libxlsxwriter 1.2.2 over FFI, with libxlsxwriter and zlib 1.3.1 vendored and compiled from source at build time (no system dependencies on macOS, Linux, or Windows).

• Workbook and Workbook.constantMemory for in-memory and constant-memory writing, with a NativeFinalizer so a forgotten workbook is freed.
• Worksheet writes: writeString, writeNumber, writeBool, writeFormula, writeDateTime, writeUrl, writeBlank.
• Layout: setColumn, setColumnWidth, setRow, mergeRange, freezePanes.
• Format with bold, italic, underline, fontName, fontSize, fontColor, backgroundColor, numberFormat, align, verticalAlign, textWrap, border, and borderColor.
• libxlsxwriter error codes surfaced as XlsxWriterException with the human-readable message.