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/**
* The `node:repl` module provides a Read-Eval-Print-Loop (REPL) implementation
* that is available both as a standalone program or includible in other
* applications. It can be accessed using:
*
* ```js
* import repl from 'node:repl';
* ```
* @see [source](https://github.com/nodejs/node/blob/v25.x/lib/repl.js)
*/
declare module "node:repl" {
import { AsyncCompleter, Completer, Interface, InterfaceEventMap } from "node:readline";
import { InspectOptions } from "node:util";
import { Context } from "node:vm";
interface ReplOptions {
/**
* The input prompt to display.
* @default "> "
*/
prompt?: string | undefined;
/**
* The `Readable` stream from which REPL input will be read.
* @default process.stdin
*/
input?: NodeJS.ReadableStream | undefined;
/**
* The `Writable` stream to which REPL output will be written.
* @default process.stdout
*/
output?: NodeJS.WritableStream | undefined;
/**
* If `true`, specifies that the output should be treated as a TTY terminal, and have
* ANSI/VT100 escape codes written to it.
* Default: checking the value of the `isTTY` property on the output stream upon
* instantiation.
*/
terminal?: boolean | undefined;
/**
* The function to be used when evaluating each given line of input.
* **Default:** an async wrapper for the JavaScript `eval()` function. An `eval` function can
* error with `repl.Recoverable` to indicate the input was incomplete and prompt for
* additional lines. See the [custom evaluation functions](https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#custom-evaluation-functions)
* section for more details.
*/
eval?: REPLEval | undefined;
/**
* Defines if the repl prints output previews or not.
* @default `true` Always `false` in case `terminal` is falsy.
*/
preview?: boolean | undefined;
/**
* If `true`, specifies that the default `writer` function should include ANSI color
* styling to REPL output. If a custom `writer` function is provided then this has no
* effect.
* @default the REPL instance's `terminal` value
*/
useColors?: boolean | undefined;
/**
* If `true`, specifies that the default evaluation function will use the JavaScript
* `global` as the context as opposed to creating a new separate context for the REPL
* instance. The node CLI REPL sets this value to `true`.
* @default false
*/
useGlobal?: boolean | undefined;
/**
* If `true`, specifies that the default writer will not output the return value of a
* command if it evaluates to `undefined`.
* @default false
*/
ignoreUndefined?: boolean | undefined;
/**
* The function to invoke to format the output of each command before writing to `output`.
* @default a wrapper for `util.inspect`
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_customizing_repl_output
*/
writer?: REPLWriter | undefined;
/**
* An optional function used for custom Tab auto completion.
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/readline.html#readline_use_of_the_completer_function
*/
completer?: Completer | AsyncCompleter | undefined;
/**
* A flag that specifies whether the default evaluator executes all JavaScript commands in
* strict mode or default (sloppy) mode.
* Accepted values are:
* - `repl.REPL_MODE_SLOPPY` - evaluates expressions in sloppy mode.
* - `repl.REPL_MODE_STRICT` - evaluates expressions in strict mode. This is equivalent to
* prefacing every repl statement with `'use strict'`.
*/
replMode?: typeof REPL_MODE_SLOPPY | typeof REPL_MODE_STRICT | undefined;
/**
* Stop evaluating the current piece of code when `SIGINT` is received, i.e. `Ctrl+C` is
* pressed. This cannot be used together with a custom `eval` function.
* @default false
*/
breakEvalOnSigint?: boolean | undefined;
}
type REPLEval = (
this: REPLServer,
evalCmd: string,
context: Context,
file: string,
cb: (err: Error | null, result: any) => void,
) => void;
type REPLWriter = (this: REPLServer, obj: any) => string;
/**
* This is the default "writer" value, if none is passed in the REPL options,
* and it can be overridden by custom print functions.
*/
const writer: REPLWriter & {
options: InspectOptions;
};
type REPLCommandAction = (this: REPLServer, text: string) => void;
interface REPLCommand {
/**
* Help text to be displayed when `.help` is entered.
*/
help?: string | undefined;
/**
* The function to execute, optionally accepting a single string argument.
*/
action: REPLCommandAction;
}
interface REPLServerSetupHistoryOptions {
filePath?: string | undefined;
size?: number | undefined;
removeHistoryDuplicates?: boolean | undefined;
onHistoryFileLoaded?: ((err: Error | null, repl: REPLServer) => void) | undefined;
}
interface REPLServerEventMap extends InterfaceEventMap {
"exit": [];
"reset": [context: Context];
}
/**
* Instances of `repl.REPLServer` are created using the {@link start} method
* or directly using the JavaScript `new` keyword.
*
* ```js
* import repl from 'node:repl';
*
* const options = { useColors: true };
*
* const firstInstance = repl.start(options);
* const secondInstance = new repl.REPLServer(options);
* ```
* @since v0.1.91
*/
class REPLServer extends Interface {
/**
* NOTE: According to the documentation:
*
* > Instances of `repl.REPLServer` are created using the `repl.start()` method and
* > _should not_ be created directly using the JavaScript `new` keyword.
*
* `REPLServer` cannot be subclassed due to implementation specifics in NodeJS.
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_class_replserver
*/
private constructor();
/**
* The `vm.Context` provided to the `eval` function to be used for JavaScript
* evaluation.
*/
readonly context: Context;
/**
* @deprecated since v14.3.0 - Use `input` instead.
*/
readonly inputStream: NodeJS.ReadableStream;
/**
* @deprecated since v14.3.0 - Use `output` instead.
*/
readonly outputStream: NodeJS.WritableStream;
/**
* The `Readable` stream from which REPL input will be read.
*/
readonly input: NodeJS.ReadableStream;
/**
* The `Writable` stream to which REPL output will be written.
*/
readonly output: NodeJS.WritableStream;
/**
* The commands registered via `replServer.defineCommand()`.
*/
readonly commands: NodeJS.ReadOnlyDict<REPLCommand>;
/**
* A value indicating whether the REPL is currently in "editor mode".
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_commands_and_special_keys
*/
readonly editorMode: boolean;
/**
* A value indicating whether the `_` variable has been assigned.
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_assignment_of_the_underscore_variable
*/
readonly underscoreAssigned: boolean;
/**
* The last evaluation result from the REPL (assigned to the `_` variable inside of the REPL).
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_assignment_of_the_underscore_variable
*/
readonly last: any;
/**
* A value indicating whether the `_error` variable has been assigned.
*
* @since v9.8.0
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_assignment_of_the_underscore_variable
*/
readonly underscoreErrAssigned: boolean;
/**
* The last error raised inside the REPL (assigned to the `_error` variable inside of the REPL).
*
* @since v9.8.0
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_assignment_of_the_underscore_variable
*/
readonly lastError: any;
/**
* Specified in the REPL options, this is the function to be used when evaluating each
* given line of input. If not specified in the REPL options, this is an async wrapper
* for the JavaScript `eval()` function.
*/
readonly eval: REPLEval;
/**
* Specified in the REPL options, this is a value indicating whether the default
* `writer` function should include ANSI color styling to REPL output.
*/
readonly useColors: boolean;
/**
* Specified in the REPL options, this is a value indicating whether the default `eval`
* function will use the JavaScript `global` as the context as opposed to creating a new
* separate context for the REPL instance.
*/
readonly useGlobal: boolean;
/**
* Specified in the REPL options, this is a value indicating whether the default `writer`
* function should output the result of a command if it evaluates to `undefined`.
*/
readonly ignoreUndefined: boolean;
/**
* Specified in the REPL options, this is the function to invoke to format the output of
* each command before writing to `outputStream`. If not specified in the REPL options,
* this will be a wrapper for `util.inspect`.
*/
readonly writer: REPLWriter;
/**
* Specified in the REPL options, this is the function to use for custom Tab auto-completion.
*/
readonly completer: Completer | AsyncCompleter;
/**
* Specified in the REPL options, this is a flag that specifies whether the default `eval`
* function should execute all JavaScript commands in strict mode or default (sloppy) mode.
* Possible values are:
* - `repl.REPL_MODE_SLOPPY` - evaluates expressions in sloppy mode.
* - `repl.REPL_MODE_STRICT` - evaluates expressions in strict mode. This is equivalent to
* prefacing every repl statement with `'use strict'`.
*/
readonly replMode: typeof REPL_MODE_SLOPPY | typeof REPL_MODE_STRICT;
/**
* The `replServer.defineCommand()` method is used to add new `.`\-prefixed commands
* to the REPL instance. Such commands are invoked by typing a `.` followed by the `keyword`. The `cmd` is either a `Function` or an `Object` with the following
* properties:
*
* The following example shows two new commands added to the REPL instance:
*
* ```js
* import repl from 'node:repl';
*
* const replServer = repl.start({ prompt: '> ' });
* replServer.defineCommand('sayhello', {
* help: 'Say hello',
* action(name) {
* this.clearBufferedCommand();
* console.log(`Hello, ${name}!`);
* this.displayPrompt();
* },
* });
* replServer.defineCommand('saybye', function saybye() {
* console.log('Goodbye!');
* this.close();
* });
* ```
*
* The new commands can then be used from within the REPL instance:
*
* ```console
* > .sayhello Node.js User
* Hello, Node.js User!
* > .saybye
* Goodbye!
* ```
* @since v0.3.0
* @param keyword The command keyword (_without_ a leading `.` character).
* @param cmd The function to invoke when the command is processed.
*/
defineCommand(keyword: string, cmd: REPLCommandAction | REPLCommand): void;
/**
* The `replServer.displayPrompt()` method readies the REPL instance for input
* from the user, printing the configured `prompt` to a new line in the `output` and resuming the `input` to accept new input.
*
* When multi-line input is being entered, a pipe `'|'` is printed rather than the
* 'prompt'.
*
* When `preserveCursor` is `true`, the cursor placement will not be reset to `0`.
*
* The `replServer.displayPrompt` method is primarily intended to be called from
* within the action function for commands registered using the `replServer.defineCommand()` method.
* @since v0.1.91
*/
displayPrompt(preserveCursor?: boolean): void;
/**
* The `replServer.clearBufferedCommand()` method clears any command that has been
* buffered but not yet executed. This method is primarily intended to be
* called from within the action function for commands registered using the `replServer.defineCommand()` method.
* @since v9.0.0
*/
clearBufferedCommand(): void;
/**
* Initializes a history log file for the REPL instance. When executing the
* Node.js binary and using the command-line REPL, a history file is initialized
* by default. However, this is not the case when creating a REPL
* programmatically. Use this method to initialize a history log file when working
* with REPL instances programmatically.
* @since v11.10.0
* @param historyPath the path to the history file
* @param callback called when history writes are ready or upon error
*/
setupHistory(historyPath: string, callback: (err: Error | null, repl: this) => void): void;
setupHistory(
historyConfig?: REPLServerSetupHistoryOptions,
callback?: (err: Error | null, repl: this) => void,
): void;
// #region InternalEventEmitter
addListener<E extends keyof REPLServerEventMap>(
eventName: E,
listener: (...args: REPLServerEventMap[E]) => void,
): this;
addListener(eventName: string | symbol, listener: (...args: any[]) => void): this;
emit<E extends keyof REPLServerEventMap>(eventName: E, ...args: REPLServerEventMap[E]): boolean;
emit(eventName: string | symbol, ...args: any[]): boolean;
listenerCount<E extends keyof REPLServerEventMap>(
eventName: E,
listener?: (...args: REPLServerEventMap[E]) => void,
): number;
listenerCount(eventName: string | symbol, listener?: (...args: any[]) => void): number;
listeners<E extends keyof REPLServerEventMap>(eventName: E): ((...args: REPLServerEventMap[E]) => void)[];
listeners(eventName: string | symbol): ((...args: any[]) => void)[];
off<E extends keyof REPLServerEventMap>(eventName: E, listener: (...args: REPLServerEventMap[E]) => void): this;
off(eventName: string | symbol, listener: (...args: any[]) => void): this;
on<E extends keyof REPLServerEventMap>(eventName: E, listener: (...args: REPLServerEventMap[E]) => void): this;
on(eventName: string | symbol, listener: (...args: any[]) => void): this;
once<E extends keyof REPLServerEventMap>(
eventName: E,
listener: (...args: REPLServerEventMap[E]) => void,
): this;
once(eventName: string | symbol, listener: (...args: any[]) => void): this;
prependListener<E extends keyof REPLServerEventMap>(
eventName: E,
listener: (...args: REPLServerEventMap[E]) => void,
): this;
prependListener(eventName: string | symbol, listener: (...args: any[]) => void): this;
prependOnceListener<E extends keyof REPLServerEventMap>(
eventName: E,
listener: (...args: REPLServerEventMap[E]) => void,
): this;
prependOnceListener(eventName: string | symbol, listener: (...args: any[]) => void): this;
rawListeners<E extends keyof REPLServerEventMap>(eventName: E): ((...args: REPLServerEventMap[E]) => void)[];
rawListeners(eventName: string | symbol): ((...args: any[]) => void)[];
// eslint-disable-next-line @definitelytyped/no-unnecessary-generics
removeAllListeners<E extends keyof REPLServerEventMap>(eventName?: E): this;
removeAllListeners(eventName?: string | symbol): this;
removeListener<E extends keyof REPLServerEventMap>(
eventName: E,
listener: (...args: REPLServerEventMap[E]) => void,
): this;
removeListener(eventName: string | symbol, listener: (...args: any[]) => void): this;
// #endregion
}
/**
* A flag passed in the REPL options. Evaluates expressions in sloppy mode.
*/
const REPL_MODE_SLOPPY: unique symbol;
/**
* A flag passed in the REPL options. Evaluates expressions in strict mode.
* This is equivalent to prefacing every repl statement with `'use strict'`.
*/
const REPL_MODE_STRICT: unique symbol;
/**
* The `repl.start()` method creates and starts a {@link REPLServer} instance.
*
* If `options` is a string, then it specifies the input prompt:
*
* ```js
* import repl from 'node:repl';
*
* // a Unix style prompt
* repl.start('$ ');
* ```
* @since v0.1.91
*/
function start(options?: string | ReplOptions): REPLServer;
/**
* Indicates a recoverable error that a `REPLServer` can use to support multi-line input.
*
* @see https://nodejs.org/dist/latest-v25.x/docs/api/repl.html#repl_recoverable_errors
*/
class Recoverable extends SyntaxError {
err: Error;
constructor(err: Error);
}
}
declare module "repl" {
export * from "node:repl";
}