In REPL, can't access the previous line's return value via `_`

[Iwaslazkis]

Search Terms

REPL, Return Value, _

Expected Behavior

$ ts-node
> const foo = 123
undefined
> foo
123
> _
123
> "strings, like anything else, should work"
'strings, like anything else, should work'
> const bar = _
undefined
> bar
'strings, like anything else, would work'
> 

Actual Behavior

$ ts-node
> const foo = 123
undefined
> foo
123
> _
<repl>.ts:6:1 - error TS2304: Cannot find name '_'.

6 _
  ~

> "strings don't work either"
"strings don't work either"
> const bar = _
<repl>.ts:7:13 - error TS2304: Cannot find name '_'.

7 const bar = _
              ~

> bar
<repl>.ts:7:1 - error TS2304: Cannot find name 'bar'.

7 bar
  ~~~

> 

Steps to reproduce the problem

Open a ts-node REPL, execute a line of code, and on the next line the return value should be accessible via _, just like on the normal node REPL, as described here.

Minimal reproduction

Given this is happening in any ts-node REPL environment as far as I can tell (at least on the versions mentioned below), I'm not sure what exactly what a "minimal reproduction" would look like here. Please specify what you want me to include if you still want one though, and I'd be happy to oblige.

Specifications

• ts-node version: v10.9.1
• node version: v19.7.0
• TypeScript version: v5.1.6
• tsconfig.json, if you're using one: N/A
• package.json: N/A
• Operating system and version: Linux 6.5.9-arch1-1, Arch Linux, GNOME
• If Windows, are you using WSL or WSL2?: No