codeburn/app/renderer/lib/ipc.ts

import type { CliError, CodeburnBridge } from './types'

// The preload script (app/electron/preload.ts) exposes `window.codeburn` as the
// typed CodeburnBridge (methods resolve to CLI JSON or reject with a plain
// CliError).
declare global {
  interface Window {
    codeburn: CodeburnBridge
  }
}

/** The typed bridge. Import this instead of touching `window` directly. */
export const codeburn: CodeburnBridge = window.codeburn

/** Coerce anything thrown across the IPC boundary into a CliError shape. */
export function normalizeCliError(err: unknown): CliError {
  if (err && typeof err === 'object' && 'kind' in err && typeof (err as CliError).kind === 'string') {
    const e = err as CliError
    return { kind: e.kind, message: e.message ?? 'codeburn CLI error', ...(e.cold ? { cold: true as const } : {}), ...(e.stage ? { stage: e.stage } : {}) }
  }
  const message = err instanceof Error ? err.message : String(err)
  return { kind: 'nonzero', message }
}