Using rspack on s390x

[interndeloitte1004-crypto]

Rspack currently does not release a bindings module for the s390x architecture. As a result, running the rspack build command results in errors.

> rspack build

ERROR in × JSON parse error: expectedtrue in '/app/package.json'
   ╭─[4:14]
 2 │   "name": "lakehouse",
 3 │   "version": "1.0.0",
 4 │   "private": true,
   ·               ▲
 5 │   "homepage": ".",
 6 │   "dependencies": {
   ╰────

ERROR in =="undefined"};if(isValidValue(singleton)){shareConfig.singleton=singleton}if(isValidValue(requiredVersion)){shareConfig.requiredVersion=requiredVersion}if(isValidValue(eager)){shareConfig.eager=eager}if(isValidValue(strictVersion)){shareConfig.strictVersion=strictVersion}const options={version,scope:[scope],shareConfig,get:factory};if(shared[name]){shared[name].push(options)}else{shared[name]=[options]}}}}return shared});merge(__webpack_require__.federation.initOptions,"remotes",()=>Object.values(__module_federation_remote_infos__).flat().filter(remote=>remote.externalType==="script"));merge(__webpack_require__.federation.initOptions,"plugins",()=>__module_federation_runtime_plugins__);early(__webpack_require__.federation,"bundlerRuntimeOptions",()=>({}));early(__webpack_require__.federation.bundlerRuntimeOptions,"remotes",()=>({}));early(__webpack_require__.federation.bundlerRuntimeOptions.remotes,"chunkMapping",()=>remotesLoadingChunkMapping);early(__webpack_require__.federation.bundlerRuntimeOptions.remotes,"remoteInfos",()=>__module_federation_remote_infos__);early(__webpack_require__.federation.bundlerRuntimeOptions.remotes,"idToExternalAndNameMapping",()=>{const remotesLoadingIdToExternalAndNameMappingMapping={};for(let[moduleId,data]of 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  × JSON parse error: expectedtrue in '/app/node_modules/@module-federation/webpack-bundler-runtime/package.json'
   ╭─[2:13]
 1 │ {
 2 │   "public": true,
   ·              ▲
 3 │   "name": "@module-federation/webpack-bundler-runtime",
 4 │   "version": "0.22.0",
   ╰────

ERROR in container entry
  × JSON parse error: expectedtrue in '/app/package.json'
   ╭─[4:14]
 2 │   "name": "lakehouse",
 3 │   "version": "1.0.0",
 4 │   "private": true,
   ·               ▲
 5 │   "homepage": ".",
 6 │   "dependencies": {
   ╰────

Rspack compiled with 3 errors in 187 ms

I tried to build multiple versions of core and bindings (1.7.6 , 1.7.5). All of them are leading ot same JSON parsing error.

It would be nice to have any kind of information.

[itxashancode]

I hit this exact issue last year when trying to run rspack on an IBM Z runner. The binary bindings aren’t published for s390x, so rspack falls back to trying to parse a garbage blob as JSON, which is why you see the “expected true” error in package.json.

First, make sure you have a Rust toolchain installed (rustc 1.70+ and cargo). Then force rspack to build its native module from source instead of downloading a prebuilt binary:

# npm
npm config set rspack_force_sync_build true
# or yarn
yarn config set rspack_force_sync_build true
# reinstall
rm -rfrf

[MukundaKatta]

s390x isn't in rspack's CI matrix, so the prebuilt binary falls through and something else (probably a shell redirect or empty file) gets parsed as the JSON binary. The error output is that empty/garbage stream. Path forward: build the @rspack/binding native module from source on your s390x host (napi build --target s390x-unknown-linux-gnu inside the rspack monorepo), then pnpm install with a local override pointing at your built tarball. Community-driven prebuilt support would need an IBM Z runner added upstream.