Breakage in Node 24

[jcubic]

My project is completely broken in Node 24. I have a REPL with a lot of features from Node.

I have syntax:

• hightlighting
• autoindent (thanks to bracket mode)
• parenthesis matching

I use:

• rl._writeToOutput (I monkey pactch it)
• rl._refreshLine (I use it to force _writeToOutput after each key)
• rl._writeToOutput(message);

I know they have underscore, but they are public not hidden.

I also use code from (not sure if there are any changes there in 24):

https://github.com/nodejs/node/blob/master/lib/internal/repl/history.js

I want to write an article about creating a REPL in Node.js, but it seems that the article would be deprecated because of Node 24.

The question is what are the breaking changes in Readline? Any clue how to migrate the code to Node 24?

Edit by @avivkeller: OP is describing an issue with readline, not the REPL

[avivkeller]

You neglected to say what's broken.

[jcubic]

Ah, sorry:

• the REPL freezes
• it takes very long to see the prompt
• syntax highlighting doesn't work
• There are no output when I type something and press enter

In summary, nothing is working.

[avivkeller]

Can you provide some source code for us to go off of? How can we reproduce the issue?

[jcubic]

Yes, sorry. This is the project, but there is a lot of code:

https://github.com/jcubic/lips/blob/master/bin/lips.js

Tomorrow will try to see if the project is in the REPL, or in my interpreter.

I will try to create a simplified version that I will be able to use the article.

[jcubic]

Ok, I know the breaking change now:

this code:

rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});
rl.historySize = 1000;

Throws an error:

Cannot set property historySize of #<Interface> which has only a getter
TypeError: Cannot set property historySize of #<Interface> which has only a getter
    at file:///home/kuba/projects/jcubic/scheme/lips/master/bin/lips.js:447:24
    at ModuleJob.run (node:internal/modules/esm/module_job:371:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:683:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)

I didn't see it because of:

process.on('uncaughtException', function (err) {
    log_error(err.message);
    log_error(err.stack);
});