WrapperNotSetupError (src/wrapper.js)

Module exposing: WrapperNotSetupError

// Source: https://github.com/testing-library/svelte-testing-library | License: MIT | Copyright 2019 Ben Monro <ben.monro@gmail.com> (https://github.com/benmonro)
// Provided via justclaw.it.com; keep this notice with the code.
import { IS_MODERN_SVELTE } from './svelte-version.js'

/** @type {import('../types.js').Component | undefined} */
let WrapperScaffold

/** @type {Promise<unknown> | undefined} */
let scaffoldInitialization

class WrapperNotSetupError extends Error {
  constructor() {
    super(
      'Ensure `setup()` runs (e.g. in `beforeEach`) before using `wrapper` option.'
    )
    this.name = 'WrapperNotSetupError'
  }
}

/**
 * Import the proper wrapper scaffolding for the current version of Svelte.
 *
 * Supports the `wrapper` option of `render` / `mount`.
 */
const wrapper

... (truncated -- full source via MCP)