Revert "chore: remove no-simd wasm of llhttp (#2871)" (#2935)

This reverts commit 3b2df8e.

.npmignore

@@ -5,6 +5,7 @@
 
 # The wasm files are stored as base64 strings in the corresponding .js files
 lib/llhttp/llhttp_simd.wasm
+lib/llhttp/llhttp.wasm
 
 !types/**/*
 !index.d.ts

build/wasm.js

@@ -79,6 +79,15 @@ module.exports = fs.readFileSync(require.resolve('./${basename(path)}'))
 `)
     }
 
+// Build wasm binary
+execSync(`${WASM_CC} ${WASM_CFLAGS} ${WASM_LDFLAGS} \
+ ${join(WASM_SRC, 'src')}/*.c \
+ -I${join(WASM_SRC, 'include')} \
+ -o ${join(WASM_OUT, 'llhttp.wasm')} \
+ ${WASM_LDLIBS}`, { stdio: 'inherit' })
+
+writeWasmChunk('llhttp.wasm', 'llhttp-wasm.js')
+
 // Build wasm simd binary
 execSync(`${WASM_CC} ${WASM_CFLAGS} -msimd128 ${WASM_LDFLAGS} \
  ${join(WASM_SRC, 'src')}/*.c \

lib/dispatcher/client-h1.js

@@ -74,7 +74,20 @@ function removeAllListeners (obj) {
 }
 
 async function lazyllhttp () {
-  const mod = await WebAssembly.compile(require('../llhttp/llhttp_simd-wasm.js'))
+  const llhttpWasmData = process.env.JEST_WORKER_ID ? require('../llhttp/llhttp-wasm.js') : undefined
+
+  let mod
+  try {
+    mod = await WebAssembly.compile(require('../llhttp/llhttp_simd-wasm.js'))
+  } catch (e) {
+    /* istanbul ignore next */
+
+    // We could check if the error was caused by the simd option not
+    // being enabled, but the occurring of this other error
+    // * https://github.com/emscripten-core/emscripten/issues/11495
+    // got me to remove that check to avoid breaking Node 12.
+    mod = await WebAssembly.compile(llhttpWasmData || require('../llhttp/llhttp-wasm.js'))
+  }
 
   return await WebAssembly.instantiate(mod, {
     env: {