fix: lazy-load repl to avoid domain side effects

Actually starting the repl will still put the process into domain-mode,
but this at least allows programs to use `ts-node` or
`--loader=ts-node/esm` without losing the ability to use
process.setUncaughtExceptionCaptureCallback().

The problem should ideally be fixed (or mitigated) in node core, but
this is still worthwhile for the benefit of supporting current node
versions.

Re: nodejs/node#48131
Fix: TypeStrong#2024

src/repl.ts

@@ -1,7 +1,8 @@
 import type * as _diff from 'diff';
 import { homedir } from 'os';
 import { join } from 'path';
-import { Recoverable, ReplOptions, REPLServer, start as nodeReplStart } from 'repl';
+import type * as _nodeRepl from 'repl';
+import type { REPLServer, ReplOptions } from 'repl';
 import { Context, createContext, Script } from 'vm';
 import { Service, CreateOptions, TSError, env } from './index';
 import { readFileSync, statSync } from 'fs';
@@ -28,6 +29,17 @@ function getDiffLines() {
   return diff.diffLines;
 }
 
+// Lazy-loaded to prevent repl's require('domain') from causing problems
+// https://github.com/TypeStrong/ts-node/issues/2024
+// https://github.com/nodejs/node/issues/48131
+let nodeRepl: typeof _nodeRepl;
+function getNodeRepl() {
+  if (nodeRepl === undefined) {
+    nodeRepl = require('repl');
+  }
+  return nodeRepl;
+}
+
 /** @internal */
 export const EVAL_FILENAME = `[eval].ts`;
 /** @internal */
@@ -140,7 +152,7 @@ interface StartReplInternalOptions extends ReplOptions {
  */
 export function createRepl(options: CreateReplOptions = {}) {
   const { ignoreDiagnosticsThatAreAnnoyingInInteractiveRepl = true } = options;
-  let nodeReplServer: REPLServer;
+  let nodeReplServer: _nodeRepl.REPLServer;
   // If `useGlobal` is not true, then REPL creates a context when started.
   // This stores a reference to it or to `global`, whichever is used, after REPL has started.
   let context: Context | undefined;
@@ -271,6 +283,7 @@ export function createRepl(options: CreateReplOptions = {}) {
       const canLogTopLevelAwaitHint = service!.options.experimentalReplAwait !== false && !service!.shouldReplAwait;
       if (error instanceof TSError) {
         // Support recoverable compilations using >= node 6.
+        const { Recoverable } = getNodeRepl();
         if (Recoverable && isRecoverable(error)) {
           callback(new Recoverable(error));
           return;
@@ -335,7 +348,7 @@ export function createRepl(options: CreateReplOptions = {}) {
     // the REPL starts for a snappier user experience on startup.
     service?.compile('', state.path);
 
-    const repl = nodeReplStart({
+    const repl = getNodeRepl().start({
       prompt: '> ',
       input: replService.stdin,
       output: replService.stdout,