createJmapConfig (src/config.ts)

Creates resolved JMAP configuration with defaults for email clients.

// Source: https://github.com/dahlia/upyo | License: MIT | Copyright 2025 Hong Minhee
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Configuration interface for JMAP transport connection settings.
 * @since 0.4.0
 */
export interface JmapConfig {
  /**
   * The JMAP session URL (e.g., `https://server/.well-known/jmap`).
   * This is used for session discovery per RFC 8620 Section 2.
   */
  readonly sessionUrl: string;

  /**
   * Bearer token for authentication.
   * Used in Authorization header as `Bearer {token}`.
   * Either `bearerToken` or `basicAuth` must be provided.
   */
  readonly bearerToken?: string;

  /**
   * Basic authentication credentials.
   * Used in Authorization header as `Basic {base64(username:password)}`.
   * Either `bearerToken` or `basi

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