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console: document the behavior of console.assert() #34501

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console: document the behavior of console.assert() #34501

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3 changes: 3 additions & 0 deletions doc/api/console.md
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,7 @@ changes:
* `...message` {any} All arguments besides `value` are used as error message.

A simple assertion test that verifies whether `value` is truthy. If it is not,
or `value` is not passed,
`Assertion failed` is logged. If provided, the error `message` is formatted
using [`util.format()`][] by passing along all message arguments. The output is
used as the error message.
Expand All @@ -162,6 +163,8 @@ console.assert(true, 'does nothing');
// OK
console.assert(false, 'Whoops %s work', 'didn\'t');
// Assertion failed: Whoops didn't work
console.assert();
// Assertion failed
```

Calling `console.assert()` with a falsy assertion will only cause the `message`
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