Sending VSCode to external functions

My primary entrypoint containing the activate() function is:

extension.ts

import * as vscode from "vscode";
import { subscribe } from "./eventListeners.ts";

export function activate(context: vscode.ExtensionContext) {
  vscode.commands.registerCommand("mycommand.activate", () => {});

  subscribe(vscode);

  context.subscriptions.push(t);
}

I decided to separate event subscription into its own file:

eventListeners.ts

import * as vscode from "vscode";

type VSCode = typeof vscode;

export function subscribe(vscode: VSCode) {
    ...
}

When creating the separate file, my intentions were:

  1. To provide the vscode instance as an argument. This seems necessary due to the unique way vscode processes commands from the activate() function.
  2. To ensure type safety in my code. Hence, the inclusion of type VSCode = typeof vscode;.

Queries:

  1. Is there a more efficient method for separating event subscription into another file without passing in the vscode instance?
  2. Is there a better approach for importing types in the distinct file?

Answer №1

When you add a command as a contribution in VSCode, the command is recognized and displayed in the command list.

However, if the only activation event for your command is when it is run, then the activate() function is not executed until the command is actually used. This means that the functionality of the command is not registered until its first execution.

I believe this may be causing confusion for you. Even though you see the command listed, the

vscode.commands.registerCommand()
method has not been executed yet, which is why other parts of the activate() function are not running. It's only triggered when the command is first used.

You may want to consider using onStartupFinished as an alternative activation event.

As for using vscode in eventListeners.ts, simply import it with import * as vscode from 'vscode' without passing it around unnecessarily.

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