WASM: Build Optimizations

[marcoroth]

This pull request applies size optimizations to the WebAssembly build, inspired by ruby/prism#3824.

The WASM bindings don't use Prism's prettyprint, JSON serialization, or pack parsing features, so we can exclude these features by defining PRISM_EXCLUDE_PRETTYPRINT, PRISM_EXCLUDE_JSON, and PRISM_EXCLUDE_PACK.

Added -Oz (optimize for size), -g0 (strip debug info), -flto (link-time optimization), and -fdata-sections -ffunction-sections (enable dead code elimination) to produce smaller output.

Excluded ruby_parser.c from the WASM build since it's only used for CLI debugging.

Results

Build	Before	After	Reduction
Browser	905K	365K	-540K (~60%)
Node	907K	365K	-542K (~60%)

Details

Before:

ls -lh javascript/packages/browser/build/libherb.js javascript/packages/node-wasm/build/libherb.js
-rw-r--r--@ 1 marcoroth  staff   905K Jan 17 11:17 javascript/packages/browser/build/libherb.js
-rw-r--r--@ 1 marcoroth  staff   907K Jan 17 11:17 javascript/packages/node-wasm/build/libherb.js

After:

ls -lh javascript/packages/browser/build/libherb.js javascript/packages/node-wasm/build/libherb.js
-rw-r--r--@ 1 marcoroth  staff   365K Jan 17 11:18 javascript/packages/browser/build/libherb.js
-rw-r--r--@ 1 marcoroth  staff   365K Jan 17 11:18 javascript/packages/node-wasm/build/libherb.js

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1075

npx https://pkg.pr.new/@herb-tools/language-server@1075

npx https://pkg.pr.new/@herb-tools/linter@1075

commit: c3f5fbc

[github-actions]

🌿 Interactive Playground and Documentation Preview

A preview deployment has been built for this pull request. Try out the changes live in the interactive playground:

• Playground Preview
• Documentation Preview
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_{🌱 Grown from commit c3f5fbc}

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✅ Preview deployment has been cleaned up.