Add file parameter type for workspace file selection in templates

[Copilot]

Templates can now prompt users to select files from the workspace via a native file picker dialog.

Changes

• Type system (ParamsPropsSchema.ts): Added 'file' as a valid param type
• File selection (generateCode/index.ts): Implemented using vscode.window.showOpenDialog, stores selected file path in params object
• Documentation (README.md): Documented params feature including all types (input, dropdown, file)
• Example (superCodeGen.schema.ts): Added "Component with Config" template demonstrating file selection

Usage

const template: SuperCodeGeneratorTemplateSchema = {
  type: 'Component with Config',
  params: [
    {
      name: 'configFile',
      type: 'file',
      description: 'Select a configuration file'
    }
  ],
  files: [{
    path: ({ name }) => `${name}.tsx`,
    template: ({ params }) => `
      // Config from: ${params.configFile}
      export default function Component() { /* ... */ }
    `
  }]
}

Selected file path is available in template/path functions via params.configFile.

Original prompt

add a template option to select a file from the workspace

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.