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doc: update example of using await in REPL #57653

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Apr 5, 2025
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doc: update example of using await in REPL #57653

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10 changes: 5 additions & 5 deletions doc/api/repl.md
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Original file line number Diff line number Diff line change
Expand Up @@ -258,8 +258,7 @@ undefined
```

One known limitation of using the `await` keyword in the REPL is that
it will invalidate the lexical scoping of the `const` and `let`
keywords.
it will invalidate the lexical scoping of the `const` keywords.

For example:

Expand All @@ -268,10 +267,11 @@ For example:
undefined
> m
123
> const m = await Promise.resolve(234)
undefined
> m
> m = await Promise.resolve(234)
234
// redeclaring the constant does error
> const m = await Promise.resolve(345)
Uncaught SyntaxError: Identifier 'm' has already been declared
```

[`--no-experimental-repl-await`][] shall disable top-level await in REPL.
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6 changes: 6 additions & 0 deletions test/parallel/test-repl-top-level-await.js
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Expand Up @@ -173,6 +173,12 @@ async function ordinaryTests() {
'3',
'undefined',
]],
// Testing documented behavior of `const`s (see: https://github.com/nodejs/node/issues/45918)
['const k = await Promise.resolve(123)'],
['k', '123'],
['k = await Promise.resolve(234)', '234'],
['k', '234'],
['const k = await Promise.resolve(345)', "Uncaught SyntaxError: Identifier 'k' has already been declared"],
// Regression test for https://github.com/nodejs/node/issues/43777.
['await Promise.resolve(123), Promise.resolve(456)', 'Promise {', { line: 0 }],
['await Promise.resolve(123), await Promise.resolve(456)', '456'],
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