Copy diagnostics to clipboard

extension.ts

// The module 'vscode' contains the VS Code extensibility API
// Import the module and reference it with the alias vscode in your code below
import * as vscode from "vscode";

// This method is called when your extension is activated
// Your extension is activated the very first time the command is executed
export function activate(context: vscode.ExtensionContext) {
  // Add a command that when executed lists all of the diagnostics in the active editor
  const disposable = vscode.commands.registerCommand(
    "yourExtension.listDiagnostics",
    () => {
      // Get the active text editor
      const editor = vscode.window.activeTextEditor;
      if (!editor) {
        return;
      }

      // Get a list of all diagnostic errors in the current file.
      const diagnostics = vscode.languages.getDiagnostics();
      // Filter down to only diagnostics in the current file.
      const currentFileDiagnostics = diagnostics.filter(
        (diagnostic) => diagnostic[0].fsPath === editor.document.uri.fsPath
      );

      const transformedDiagnostics = currentFileDiagnostics
        .map((entry) => {
          const [uri, diagnostics] = entry;
          return diagnostics.map((diagnostic) => {
            const { range, message, severity } = diagnostic;
            const { start, end } = range;
            const { line, character } = start;
            return `L${line + 1}: ${message}`;
          });
        })
        .flat();

      // Copy the list of diagnostics to the clipboard
      vscode.env.clipboard.writeText(transformedDiagnostics.join("\n\n"));
    }
  );

  context.subscriptions.push(disposable);
}

// This method is called when your extension is deactivated
export function deactivate() {}