GraalVM support? ReferenceError: global is not defined

[helllamer]

Just a small feature request:
Add support for undefined global namespace, if js-runtime environment is not a browser and not a nodejs.

TL;DR

// webpackBootstrap
require("raf");

org.graalvm.polyglot.PolyglotException: ReferenceError: global is not defined
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/raf/index.js?:2)

Workaround

var global = {};
// run webpack stuff:
require("raf");
// webpack import ok

Full GraalVM backtrace

Mostly useless.

EXPAND BACKTRACES

Exception in thread "ScalaGraal-pool-1-thread-1" japgolly.scalagraal.ExprError$EvalError: ReferenceError: global is not defined
	at japgolly.scalagraal.ExprError$InEval$.unapply(ExprError.scala:23)
	at japgolly.scalagraal.Expr$.$anonfun$apply$2(Expr.scala:168)
	at japgolly.scalagraal.Expr.$anonfun$$greater$greater$1(Expr.scala:144)
	at japgolly.scalagraal.Expr.evalOrThrow(Expr.scala:25)
	at japgolly.scalagraal.GraalContext$Builder.evalOrThrow$1(GraalContext.scala:131)
	at japgolly.scalagraal.GraalContext$Builder.$anonfun$build$3(GraalContext.scala:134)
	at japgolly.scalagraal.GraalContext$Builder.$anonfun$build$3$adapted(GraalContext.scala:134)
	at scala.Option.foreach(Option.scala:437)
	at japgolly.scalagraal.GraalContext$Builder.build(GraalContext.scala:134)
	at japgolly.scalagraal.GraalContextPool$Builder$Fixed$Step2A.$anonfun$build$1(GraalContextPool.scala:84)
	at scala.Function1.$anonfun$andThen$1(Function1.scala:85)
	at japgolly.scalagraal.GraalContextPool$Builder$Fixed$Step2B.$anonfun$build$2(GraalContextPool.scala:96)
	at japgolly.scalagraal.GraalContextPool$DefaultContextThread$$anon$2.run(GraalContextPool.scala:164)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.graalvm.polyglot.PolyglotException: ReferenceError: global is not defined
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/raf/index.js?:2)
	at <js>../node_modules/raf/index.js(showcasessr-fastopt-library.js:4941)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/react-motion/lib/Motion.js?:31)
	at <js>../node_modules/react-motion/lib/Motion.js(showcasessr-fastopt-library.js:5050)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/react-motion/lib/react-motion.js?:7)
	at <js>../node_modules/react-motion/lib/react-motion.js(showcasessr-fastopt-library.js:5116)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:anonymous(webpack://ScalaJSBundlerLibrary/./node_modules/react-stonecutter/lib/react-stonecutter.js?:1)
	at org.graalvm.sdk/org.graalvm.polyglot.Context.eval(Context.java:379)
	... 13 more
Exception in thread "ScalaGraal-pool-1-thread-2" japgolly.scalagraal.ExprError$EvalError: ReferenceError: global is not defined
	at japgolly.scalagraal.ExprError$InEval$.unapply(ExprError.scala:23)
	at japgolly.scalagraal.Expr$.$anonfun$apply$2(Expr.scala:168)
	at japgolly.scalagraal.Expr.$anonfun$$greater$greater$1(Expr.scala:144)
	at japgolly.scalagraal.Expr.evalOrThrow(Expr.scala:25)
	at japgolly.scalagraal.GraalContext$Builder.evalOrThrow$1(GraalContext.scala:131)
	at japgolly.scalagraal.GraalContext$Builder.$anonfun$build$3(GraalContext.scala:134)
	at japgolly.scalagraal.GraalContext$Builder.$anonfun$build$3$adapted(GraalContext.scala:134)
	at scala.Option.foreach(Option.scala:437)
	at japgolly.scalagraal.GraalContext$Builder.build(GraalContext.scala:134)
	at japgolly.scalagraal.GraalContextPool$Builder$Fixed$Step2A.$anonfun$build$1(GraalContextPool.scala:84)
	at scala.Function1.$anonfun$andThen$1(Function1.scala:85)
	at japgolly.scalagraal.GraalContextPool$Builder$Fixed$Step2B.$anonfun$build$2(GraalContextPool.scala:96)
	at japgolly.scalagraal.GraalContextPool$DefaultContextThread$$anon$2.run(GraalContextPool.scala:164)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.graalvm.polyglot.PolyglotException: ReferenceError: global is not defined
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/raf/index.js?:2)
	at <js>../node_modules/raf/index.js(showcasessr-fastopt-library.js:4941)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/react-motion/lib/Motion.js?:31)
	at <js>../node_modules/react-motion/lib/Motion.js(showcasessr-fastopt-library.js:5050)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:program(webpack://ScalaJSBundlerLibrary/./node_modules/react-motion/lib/react-motion.js?:7)
	at <js>../node_modules/react-motion/lib/react-motion.js(showcasessr-fastopt-library.js:5116)
	at <js>.__webpack_require__(showcasessr-fastopt-library.js:5808)
	at <js>.:anonymous(webpack://ScalaJSBundlerLibrary/./node_modules/react-stonecutter/lib/react-stonecutter.js?:1)
	at org.graalvm.sdk/org.graalvm.polyglot.Context.eval(Context.java:379)
	... 13 more

[ljharb]

How does graal have require but not node’s other globals?

[helllamer]

I'm not a specialist in js/require/webpack.
Just trying to run webpack-bundled js-file for SSR via GraalVM polyglot
All else dependencies (like react, etc) don't throw such exceptions.

GraalVM officially have several (or more?) options for JS execution:

• Polyglot: java-code creates a new JS-language Context and loads JS-file into it. (current issue case)
• Node.js compatible environment via gu install nodejs https://www.graalvm.org/reference-manual/js/NodeJS/ (global should be available here by default).

[ljharb]

Webpack 5 is broken, and doesn’t polyfill node globals by default. What you’ll want to do, instead of setting global to an empty object, is replace all instances of a global global in the bundle with globalThis (assuming graal supports that).

[helllamer]

Thanks. I need some time to understand and apply your information to make further steps.
This issue should be closed, by now?

[jbeuckm]

We have to hack around this. Any update? Building web workers with Vite and global is undefined.

[ljharb]

@jbeuckm if vite won't polyfill it properly by default, then you'd have to either configure it to do so, or switch to a working bundler.