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repl: change preview default in case of custom eval functions #31259

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repl: change preview default in case of custom eval functions #31259

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5 changes: 3 additions & 2 deletions doc/api/repl.md
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Expand Up @@ -596,8 +596,9 @@ changes:
`SIGINT` is received, such as when `Ctrl+C` is pressed. This cannot be used
together with a custom `eval` function. **Default:** `false`.
* `preview` {boolean} Defines if the repl prints autocomplete and output
previews or not. **Default:** `true`. If `terminal` is falsy, then there are
no previews and the value of `preview` has no effect.
previews or not. **Default:** `true` with the default eval function and
`false` in case a custom eval function is used. If `terminal` is falsy, then
there are no previews and the value of `preview` has no effect.
* Returns: {repl.REPLServer}

The `repl.start()` method creates and starts a [`repl.REPLServer`][] instance.
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3 changes: 2 additions & 1 deletion lib/repl.js
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Expand Up @@ -212,8 +212,9 @@ function REPLServer(prompt,
}
}

// TODO(devsnek): Add a test case for custom eval functions.
const preview = options.terminal &&
(options.preview !== undefined ? !!options.preview : true);
(options.preview !== undefined ? !!options.preview : !eval_);

this.inputStream = options.input;
this.outputStream = options.output;
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