Node: Wrong hint message when parsing expression such as {a:1}['a'] === 1 in node

[Killea]

Welcome to Node.js v13.8.0.
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{a:1}['a'] === 1
false
{a:1}['a'] === 1
true (have not press enter, if press enter it turns to false)

• Version: 13.8
• Platform: Linux
• Subsystem: NA

I tested on Chrome, it always shows false. I'm sure this is a bug.

What steps will reproduce the bug?

Type {a:1}['a'] === 1 in a node console.

How often does it reproduce? Is there a required condition?

Every time.

What is the expected behavior?

The gray font of 'true' in this image should be 'false'!

[targos]

@BridgeAR

[devsnek]

The two ways this is parsed:

• ({ a: 1 }['a'] === 1); in preview
• { a:1; }; ['a'] === 1; in repl eval

We should probably eagerly try to wrap all input in parens in the actual evaluator.

[codebytere]

Mind if i take a stab at this one?

[tniessen]

We should probably eagerly try to wrap all input in parens in the actual evaluator.

That might break working code, or am I missing something?

class Foo {} function foo() {} contains two valid declarations, but not if wrapped as an expression in parentheses.

[devsnek]

@tniessen if the code isn't valid with parens, parens are not used. the logic should more or less be: try { parse(wrap(input)); input = wrap(input); } catch {}

[codebytere]

Closed in https://github.com/nodejs/node/pull/31943.