fix(codegen): remove end sourcemaps for }, ], )

[Boshen]

closes #13174

This should reduce sourcemap memory usage by a huge amount.

These tokens were added in esbuild for code coverage: evanw/esbuild@c4d45e6

But esbuild has an optimization to not generate these tokens when } is not on the same line

if class.CloseBraceLoc.Start > class.BodyLoc.Start {
    p.addSourceMapping(class.CloseBraceLoc)
}

We should revisit these tokens later in the future.

[graphite-app]

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[Copilot]

Pull Request Overview

This PR removes end sourcemap generation for closing brackets (}, ], )), which should significantly reduce sourcemap memory usage. This follows an optimization pattern used by esbuild that only generates sourcemaps for closing brackets under specific conditions.

• Removes add_source_mapping_end function and its calls throughout the codebase
• Updates development dependencies to support sourcemap visualization examples
• Adds new transformer plugin example demonstrating define replacement functionality

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/oxc_codegen/src/lib.rs	Removes add_source_mapping_end function and its usage in block printing methods
crates/oxc_codegen/src/gen.rs	Removes calls to add_source_mapping_end for various AST node types (arrays, objects, patterns)
crates/oxc_minifier/examples/minifier.rs	Updates sourcemap visualization to use new SourcemapVisualizer utility
crates/oxc_minifier/Cargo.toml	Replaces base64 dependency with oxc_sourcemap for visualization
crates/oxc_transformer_plugins/examples/define.rs	Adds new example demonstrating define replacement with sourcemap support
crates/oxc_transformer_plugins/Cargo.toml	Adds dependencies for the new example (pico-args, oxc_semantic)

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #13180 will improve performances by 3.35%

_{Comparing improve-sourcemap (f10ac33) with main (deddc8c)¹}

Summary

⚡ 2 improvements
✅ 32 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	codegen[RadixUIAdoptionSection.jsx]	123.6 µs	119.6 µs	+3.35%
⚡	minifier[cal.com.tsx]	31.1 ms	30.1 ms	+3.31%

Footnotes

1. No successful run was found on main (f10ac33) during the generation of this report, so deddc8c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[Boshen]

Merge activity

• Aug 18, 11:41 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Aug 18, 11:44 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Aug 18, 11:50 AM UTC: Merged by the Graphite merge queue.