Extend node.js REPL completer

[RuslanGlaznyov]

Details

I implement my custom REPL, I see that we can specify completer function. But I don't wont to replace the existing completer I want to extend prev one. For instance, I would like to add additional autocompletion (function, let, const), but leave all perv autocompletion such as defined vars

Node.js version

v18.12.1 and above

Example code

const customRepl = repl.start({
  prompt: '> ',
  preview: true,
  useColors: true,
  terminal: true,
  completer: extendedCompleter
});

Operating system

Mac OS. m1

Scope

code, repl

Module and version

Not applicable.

[preveen-stack]

pls check if this meets your purpose

// Create a custom completer function
function customCompleter(line) {
  // Get the default completer function
  const defaultCompleter = repl.completer;

  // Call the default completer to get its completions
  const [completions, originalLine] = defaultCompleter(line);

  // Add your custom completions or modify the existing ones
  const customCompletions = ['apple', 'banana', 'cherry', 'date'];
  const combinedCompletions = completions.concat(customCompletions);

  // Return the combined completions and the original line
  return [combinedCompletions, originalLine];
}

[preveen-stack]

cc @nodejs/repl

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[zen0wu]

pls check if this meets your purpose

// Create a custom completer function
function customCompleter(line) {
  // Get the default completer function
  const defaultCompleter = repl.completer;

  // Call the default completer to get its completions
  const [completions, originalLine] = defaultCompleter(line);

  // Add your custom completions or modify the existing ones
  const customCompletions = ['apple', 'banana', 'cherry', 'date'];
  const combinedCompletions = completions.concat(customCompletions);

  // Return the combined completions and the original line
  return [combinedCompletions, originalLine];
}

having the same issue, where does this repl instance come from? if it's a constructed REPLServer, there's no way to override completer later, if it's the repl module it doesn't have the completer property, so i don't think this works

[zen0wu]

what i've tried that might work is this, but it doesn't feel a great solution

    const tmpReplServer = repl.start({
        input: fs.createReadStream("/dev/null"),
        output: fs.createWriteStream("/dev/null"),
    })
    const defaultCompleter = tmpReplServer.completer
    tmpReplServer.close()

    const replServer = repl.start({ 
        completer:  defaultCompleter, // can customize
    })