Support GraalVM >= 21.2.0
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plata commented
The Nashorn compatibility changed to ECMAScript 5, see changelog. Therefore, e.g. several Array related methods like flatMap() do not work anymore (see also this comment).
It might be sufficient to set the ES version in:
Similar to:
Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
bindings.put("polyglot.js.ecmascript-version", "2017");