Redirect console calls to connection.console

[remcohaszing]

A language server may use console methods for various reasons. For example:

• A third party dependency assumes this is ok
• A third party plugin assumes this is ok
• It’s commonly used for logging / debugging.

When using the stdio protocol with vscode-languageserver, this causes issues.

In this case, it would be nice if console calls are patched, so the output gets redirected to connection.console

I think just the following methods would already catch most use cases:

import { inspect } from 'node:util'

function serialize(args: unknown[]) {
  return args.map(arg => typeof arg === 'string' ? arg : inspect(arg)).join(' ')
}

console.assert = (assertion, ...args) => {
  if (assertion) {
    return
  }
  if (args.length === 0) {
    connection.console.log('Assertion failed')
  } else {
    const [message, ...rest] = args
    connection.console.log(`Assertion failed: ${message} ${serialize(rest)}`)
  }
}
console.dir = (arg) => connection.console.log(inspect(arg))
console.log = (...args) => connection.console.log(serialize(args))
console.error = (...args) => connection.console.error(serialize(args))
console.warn = (...args) => connection.console.warn(serialize(args))