[intellild]

Summary

• Make Printer use std::fmt::Write as its output interface.
• Track line and column state for multiline write_str calls in the Write implementation.
• Replace explicit .map_err(Into::into) adapters with ?-based error propagation.
• Update serializers, derives, examples, and custom at-rule tests to use the standard write methods.

Example

A serializer can now write through the standard formatting interface:

use std::fmt::Write;

printer.write_str("a\nb")?;
printer.write_char(';')?;
Ok(())

The printer keeps source-map line and column state correct even when one write_str call contains newlines.

Validation

• cargo check --workspace --all-features
• cargo fmt --all -- --check

Stack

1. Fix bundled source-map indices
2. This PR
3. Serialize CSS through PrinterTrait
4. Introduce the custom_sourcemap feature flag
5. Custom source maps through generic PrinterOptions

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by OpenAI Codex

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-04T06:54:00.759396Z	8bfdc10	PR opened

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[codspeed]

Merging this PR will not alter performance

✅ 8 untouched benchmarks
⏩ 8 skipped benchmarks¹

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_{Comparing codex/rstack-printer-write (f077386) with codex/rstack-fix-bundler-source-indices (b391f63)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩