typescript.ts

/**
 * @fileoverview TypeScript availability detection.
 * Exports small getters that probe whether the `typescript` package's type
 * definitions and lib files are resolvable from the current project.
 */

/**
 * Check whether TypeScript's `lib/` directory is resolvable from the current
 * project by probing `typescript/lib`.
 *
 * @returns `true` when the `typescript` package's libs can be resolved.
 */
export function getTsLibsAvailable(): boolean {
  try {
    require.resolve('typescript/lib')
    return true
  } catch {
    return false
  }
}

export function getTsTypesAvailable(): boolean {
  try {
    require.resolve('typescript/lib/lib.d.ts')
    return true
  } catch {
    /* c8 ignore next - TypeScript is a project devDep; the catch
       only fires when consumers run without typescript installed. */
    return false
  }
}