scripts: add wasm_exec.js generator#201
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Adds scripts/gen-wasm-exec, a TypeScript + jscodeshift tool that fetches upstream wasm_exec.js from golang/go and tinygo-org/tinygo at the configured tags and reapplies the Workers-specific patches (context arg on Go.run, globalProxy, TinyGo Node.js-only blocks commented out). Run `make gen-wasm-exec` (with optional GO_VERSION / TINYGO_VERSION overrides) to regenerate cmd/workers-assets-gen/assets/wasm_exec_*.js. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Move the common AST patching steps out of transform-go.ts and transform-tinygo.ts into a shared transformWasmExec() helper, parametrized by globalName, expected standalone-global count, and the globalProxy decl. TinyGo keeps its Node.js-block commenting pre-step locally and delegates the rest. Output for Go 1.26.2 / TinyGo 0.41.1 is byte-identical to before. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Use Reflect.get(target, prop, target) in the TinyGo globalProxy decl, matching the Go side. Now that both flavors share the same proxy body (only the global name differs), the literal moves into transform-wasm-exec behind a buildGlobalProxyDecl(globalName) helper, so the two wrappers no longer carry their own copies. Regenerated wasm_exec_tinygo.js reflects the one-line behavior change. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
scripts/gen-wasm-exec, a TypeScript + jscodeshift tool that fetches upstreamwasm_exec.jsfromgolang/go/tinygo-org/tinygoand reapplies the Workers-specific patches.make gen-wasm-exec(with optionalGO_VERSION/TINYGO_VERSIONoverrides) to regeneratecmd/workers-assets-gen/assets/wasm_exec_*.js.globalProxyto useReflect.get(target, prop, target), matching Go.