foobar.ts

import * as vscode from 'vscode'; 

export class FoobarCompletion implements vscode.CompletionItemProvider {
	provideCompletionItems(document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken): Thenable<vscode.CompletionItem[]> {
		return new Promise((resolve, reject) => {
			let items: vscode.CompletionItem[] = [
				new vscode.CompletionItem("apple"),
				new vscode.CompletionItem("banana"),
				new vscode.CompletionItem("car"),
				new vscode.CompletionItem("door"),
				new vscode.CompletionItem("exit"),
				new vscode.CompletionItem("focus"),
				new vscode.CompletionItem("guy"),
				new vscode.CompletionItem("hi"),
				new vscode.CompletionItem("intel"),
				new vscode.CompletionItem("javascript"),
				new vscode.CompletionItem("knife"),
				new vscode.CompletionItem("lemon"),
				new vscode.CompletionItem("mars"),
				new vscode.CompletionItem("notch"),
				new vscode.CompletionItem("opensource"),
				new vscode.CompletionItem("party"),
				new vscode.CompletionItem("quartz"),
				new vscode.CompletionItem("reset"),
				new vscode.CompletionItem("stuff"),
				new vscode.CompletionItem("tardis"),
				new vscode.CompletionItem("ukulele"),
				new vscode.CompletionItem("version"),
				new vscode.CompletionItem("wide"),
				new vscode.CompletionItem("x11"),
				new vscode.CompletionItem("youtube"),
				new vscode.CompletionItem("zymogen"),
			];
			resolve(items);
		});
	}
}