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repl: add experimental TypeScript support #64077

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10 changes: 10 additions & 0 deletions doc/api/cli.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1362,6 +1362,16 @@ added:
Enable experimental support for the QUIC protocol.

### `--experimental-repl-typescript`

<!--
added: REPLACEME
-->

> Stability: 1.2 - Release candidate

@marco-ippolito marco-ippolito Jun 23, 2026

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Why release candidate

Enable experimental support for TypeScript stripping in the REPL.

### `--experimental-sea-config`

<!-- YAML
Expand Down
1 change: 1 addition & 0 deletions lib/internal/modules/typescript.js
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Original file line number Diff line number Diff line change
Expand Up @@ -185,4 +185,5 @@ module.exports = {
stripTypeScriptModuleTypes,
stripTypeScriptTypes,
stripTypeScriptTypesForCoverage,
processTypeScriptCode,
};
19 changes: 17 additions & 2 deletions lib/repl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -95,12 +95,14 @@ const {
const acornWalk = require('internal/deps/acorn/acorn-walk/dist/walk');
const {
decorateErrorStack,
emitExperimentalWarning,
isError,
deprecate,
SideEffectFreeRegExpPrototypeSymbolReplace,
SideEffectFreeRegExpPrototypeSymbolSplit,
} = require('internal/util');
const { inspect } = require('internal/util/inspect');
const { processTypeScriptCode } = require('internal/modules/typescript');
const vm = require('vm');

const { runInThisContext, runInContext } = vm.Script.prototype;
Expand Down Expand Up @@ -141,6 +143,10 @@ const {
const experimentalREPLAwait = getOptionValue(
'--experimental-repl-await',
);
const experimentalREPLTypeScript = getOptionValue(
'--experimental-repl-typescript',
);

const pendingDeprecation = getOptionValue('--pending-deprecation');
const {
REPL_MODE_SLOPPY,
Expand Down Expand Up @@ -241,6 +247,11 @@ function removeProcessNewListener() {

fixReplRequire(module);

const tsOptions = { __proto__: null, mode: 'transform' };

@Renegade334 Renegade334 Jun 23, 2026

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transform? We have removed this mode, I don't see that we would want to offer different TS support in REPL than in normal execution?

@marco-ippolito marco-ippolito Jun 23, 2026 •
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Yes we should not transform at all

if (experimentalREPLTypeScript) {
emitExperimentalWarning('TypeScript support in the REPL');
}

// This is the default "writer" value, if none is passed in the REPL options,
// and it can be overridden by custom print functions, such as `probe` or
// `eyes.js`.
Expand Down Expand Up @@ -499,7 +510,9 @@ class REPLServer extends Interface {
const fallbackCode = SideEffectFreeRegExpPrototypeSymbolReplace(/\bawait\b/g, code, '');
try {
makeContextifyScript(
fallbackCode, // code
experimentalREPLTypeScript ?
processTypeScriptCode(fallbackCode, tsOptions) :
fallbackCode, // code
file, // filename,
0, // lineOffset
0, // columnOffset,
Expand Down Expand Up @@ -537,7 +550,9 @@ class REPLServer extends Interface {
code = `'use strict'; void 0;\n${code}`;
}
script = makeContextifyScript(
code, // code
experimentalREPLTypeScript ?
processTypeScriptCode(code, tsOptions) :
code, // code
file, // filename,
0, // lineOffset
0, // columnOffset,
Expand Down
4 changes: 4 additions & 0 deletions src/node_options.cc
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Expand Up @@ -726,6 +726,10 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
&EnvironmentOptions::experimental_repl_await,
kAllowedInEnvvar,
true);
AddOption("--experimental-repl-typescript",
"experimental TypeScript support in REPL",
&EnvironmentOptions::experimental_repl_typescript,
kAllowedInEnvvar);
AddOption("--experimental-vm-modules",
"experimental ES Module support in vm module",
&EnvironmentOptions::experimental_vm_modules,
Expand Down
1 change: 1 addition & 0 deletions src/node_options.h
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Expand Up @@ -154,6 +154,7 @@ class EnvironmentOptions : public Options {
bool allow_ffi = false;
bool allow_worker_threads = false;
bool experimental_repl_await = true;
bool experimental_repl_typescript = false;
bool experimental_vm_modules = EXPERIMENTALS_DEFAULT_VALUE;
bool async_context_frame = true;
bool expose_internals = false;
Expand Down
23 changes: 23 additions & 0 deletions test/parallel/test-repl-typescript.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
// Flags: --experimental-repl-typescript
'use strict';
require('../common');
const assert = require('assert');

const { startNewREPLServer } = require('../common/repl');

const { input, output } = startNewREPLServer({ terminal: false, prompt: '> ' });

input.emit('data', 'let x: number = 3\n');
assert.match(output.accumulator, /undefined\n> /);

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /undefined\n> /. Input:

'> Uncaught Error [ERR_NO_TYPESCRIPT]: Node.js is not compiled with TypeScript support\n' +
  '    at assertTypeScript (node:internal/util:247:11)\n' +
  '    at node:internal/modules/typescript:35:3 {\n' +
  "  code: 'ERR_NO_TYPESCRIPT'\n" +
  '}\n' +
  '> '

    at Object.<anonymous> (/Users/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:11:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: '> Uncaught Error [ERR_NO_TYPESCRIPT]: Node.js is not compiled with TypeScript support\n' +
    '    at assertTypeScript (node:internal/util:247:11)\n' +
    '    at node:internal/modules/typescript:35:3 {\n' +
    "  code: 'ERR_NO_TYPESCRIPT'\n" +
    '}\n' +
    '> ',
  expected: /undefined\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /Users/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /undefined\n> /. Input:

'> Uncaught Error [ERR_NO_TYPESCRIPT]: Node.js is not compiled with TypeScript support\n' +
  '    at assertTypeScript (node:internal/util:247:11)\n' +
  '    at node:internal/modules/typescript:35:3 {\n' +
  "  code: 'ERR_NO_TYPESCRIPT'\n" +
  '}\n' +
  '> '

    at Object.<anonymous> (/Users/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:11:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: '> Uncaught Error [ERR_NO_TYPESCRIPT]: Node.js is not compiled with TypeScript support\n' +
    '    at assertTypeScript (node:internal/util:247:11)\n' +
    '    at node:internal/modules/typescript:35:3 {\n' +
    "  code: 'ERR_NO_TYPESCRIPT'\n" +
    '}\n' +
    '> ',
  expected: /undefined\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /Users/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js
output.accumulator = '';

input.emit('data', 'x\n');
assert.match(output.accumulator, /3\n> /);

// Transform TypeScript to JavaScript and evaluate it
input.emit('data', 'enum Color { Red, Green, Blue }\n');

@marco-ippolito marco-ippolito Jun 23, 2026

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Can you add a test for:
const foo = () => 'hello world'; foo<Object>();
If should return false. This basically makes sure valid js is evaluated before ts

assert.match(output.accumulator, /undefined\n> /);
output.accumulator = '';

input.emit('data', 'Color.Reed\n');
assert.match(output.accumulator, /0\n> /);

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/node/node/node/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/node/node/node/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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GitHub Actions / test-linux (ubuntu-24.04) 

--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/node/node/node/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/node/node/node/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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GitHub Actions / test-macOS 

--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/Users/runner/work/node/node/node/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /Users/runner/work/node/node/node/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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GitHub Actions / x86_64-linux: with shared libraries 

--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js

Check failure on line 23 in test/parallel/test-repl-typescript.js

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GitHub Actions / aarch64-linux: with shared openssl-4.0.0 

--- stderr ---
node:internal/assert/utils:146
  throw error;
  ^

AssertionError [ERR_ASSERTION]: The input did not match the regular expression /0\n> /. Input:

'undefined\n> '

    at Object.<anonymous> (/home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js:23:8)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: 'undefined\n> ',
  expected: /0\n> /,
  operator: 'match',
  diff: 'simple'
}

Node.js v27.0.0-pre
Command: out/Release/node --experimental-repl-typescript /home/runner/work/_temp/node-v27.0.0-nightly2026-06-23fc5febe877-slim/test/parallel/test-repl-typescript.js
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