Unable to evaluate object correctly

See this for example:

duk> {}
= undefined
duk> {test: "foo"}
= "foo"
duk> {"test": "foo"}
SyntaxError: unterminated statement (line 1)
    at [anon] (input:1) internal
    at [anon] (duk_js_compiler.c:6738) internal

However Node (10 FYI) correctly recognize those constructs:

> {}
{}
> {test: "foo"}
{ test: 'foo' }
> {"test": "foo"}
{ test: 'foo' }

DT “incorrectly” saw object declaration as a statement, which is plausible: It can be object literal

https://github.com/antlr/grammars-v4/blob/master/javascript/JavaScriptParser.g4#L309 I think this is useful.

Workaround: wrap the object “expression” in quotes, which forces it to become a true (super) expression, but statements would fail. Or maybe is that the parser precedence for block statement a bit too high?

[svaarala]

You could probably also use a trial method where you’d first try to parse as '(' + expr + ')' and if that fails, parse as expr.

[svaarala]

When you say { test: "foo" } it doesn’t parse as an object literal, but as a code block with a label:

{
    test: /* LABEL */
        "foo"  /* expression statement */
}

This is the correct parsing with Ecmascript syntax for eval’d code. If you want to eval that, parentheses are needed: ({ test: "foo" }).