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doc: specify return type for tty.isatty() #27154

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doc: specify return type for tty.isatty() #27154

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1 change: 1 addition & 0 deletions doc/api/tty.md
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Expand Up @@ -245,6 +245,7 @@ added: v0.5.8
-->

* `fd` {number} A numeric file descriptor
* Returns: {boolean}

The `tty.isatty()` method returns `true` if the given `fd` is associated with
a TTY and `false` if it is not, including whenever `fd` is not a non-negative
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