feat: handle DEP0187 Instantiating `node:rep`l classes without `new`

[AugustinMauroy]

Instantiating node:repl classes without new

Description

Since instantiating node:repl classes without new is deprecated (DEP0185) and has reached Runtime status, we should provide a codemod to replace it.

• The codemod should add new keyword when instantiating REPL classes without it.
• The codemod should handle REPL-related classes that require proper instantiation.
• The codemod should handle both CommonJS and ESM imports.
• The codemod should preserve any constructor arguments and assignments.

Additional Information

Note that instantiating node:repl classes without the new qualifier was deprecated and reached Runtime status in Node.js v24.0.0. The deprecation was introduced because calling class constructors without new can lead to unexpected behavior and is not consistent with standard JavaScript class instantiation patterns. Instead of calling constructors directly, developers should use the new keyword when instantiating REPL classes.

The REPL classes were designed to be instantiated as proper class instances, and calling them as functions bypasses important initialization logic.

Examples

Example 1: Basic REPL server instantiation

Before:

const repl = require("node:repl");
const server = repl.REPLServer();

After:

const repl = require("node:repl");
const server = new repl.REPLServer();

Example 2: REPL server with options

Before:

const repl = require("node:repl");
const server = repl.REPLServer({
  prompt: "custom> ",
  input: process.stdin,
  output: process.stdout
});

After:

const repl = require("node:repl");
const server = new repl.REPLServer({
  prompt: "custom> ",
  input: process.stdin,
  output: process.stdout
});

Example 3: Destructured import

Before:

const { REPLServer } = require("node:repl");
const server = REPLServer({ prompt: ">>> " });

After:

const { REPLServer } = require("node:repl");
const server = new REPLServer({ prompt: ">>> " });

Example 4: ESM import usage

Before:

import { REPLServer } from "node:repl";
const server = REPLServer();

After:

import { REPLServer } from "node:repl";
const server = new REPLServer();

Example 5: Function parameter usage

Before:

const repl = require("node:repl");
function createREPL(options) {
  return repl.REPLServer(options);
}

After:

const repl = require("node:repl");
function createREPL(options) {
  return new repl.REPLServer(options);
}

Example 6: Variable assignment with configuration

Before:

const repl = require("node:repl");
const customREPL = repl.REPLServer({
  prompt: "node> ",
  useColors: true,
  useGlobal: false
});

After:

const repl = require("node:repl");
const customREPL = new repl.REPLServer({
  prompt: "node> ",
  useColors: true,
  useGlobal: false
});

Refs

• DEP0185: Instantiating node:repl classes without new