* fix(og): dedupe resvg/yoga wasm in server bundle
vinext shipped each @vercel/og WASM module twice — once per loader
strategy — even though only one strategy runs at runtime, wasting
~1.4 MiB per build.
resvg.wasm was emitted as a hashed asset by the `import("./resvg.wasm?module")`
path (used by workerd) AND copied as a second byte-identical root file
purely for the Node.js disk-read fallback. yoga.wasm was emitted as a
hashed asset AND inlined as a ~95 KiB base64 blob in index.edge for the
Node.js fallback.
This change makes each WASM ship exactly once, with every loader path
resolving to the single emitted file:
- og-font-patch (index.ts): drop the yoga base64 preamble and switch the
Node.js yoga fallback to a disk read (node:fs + new URL), mirroring resvg.
- og-assets.ts: in generateBundle, when the bundler already emitted the
WASM asset, rewrite the `new URL("./x.wasm", import.meta.url)` fallback
reference to point at the emitted sibling asset; only copy a root file in
writeBundle when no asset was emitted.
The dedup decision keys off whether the bundler emitted the asset, never
the deploy target, so it benefits Node/self-hosted builds too. No platform
detection.
* fix(og): keep chunk sourcemap in sync on wasm fallback rewrite
Use magic-string (already a dependency) for the generateBundle fallback-URL
rewrite so the chunk's sourcemap stays valid after the edit, instead of a
blind string replace that invalidated chunk.map.
Also extract copyMissingOgWasm() as a dependency-injected helper and make the
copy-fallback test hermetic: yoga.wasm is not shipped by @vercel/og (it is
synthesized from base64 by the og-font-patch transform), so the prior test
only passed when a previous build had left yoga.wasm in node_modules.
* test(og): cover cross-directory fallback rewrite; document cross-hook state
Address bonk review observations: add a test asserting the path.posix.relative
rewrite produces a directory-relative ref when the chunk and emitted asset live
in different dirs (the main behavioral win), and document the generateBundle->
writeBundle dedupedBases dependency.
James Anderson