Function validateSourceConfig

src/config/toml-loader.ts:373–641

* Validate a single source configuration

(source: SourceConfig, configPath: string)

 * Validate a single source configuration
 */
function validateSourceConfig(source: SourceConfig, configPath: string): void {
  const hasConnectionParams =
    source.type && (source.type === "sqlite" ? source.database : source.host);

  if (!source.dsn && !hasConnectionParams) {
    throw new Error(
      `Configuration file ${configPath}: source '${source.id}' must have either:\n` +
        `  - 'dsn' field (e.g., dsn = "postgres://user:pass@host:5432/dbname")\n` +
        `  - OR connection parameters (type, host, database, user, password)\n` +
        `  - For SQLite: type = "sqlite" and database path`
    );
  }

  // Validate type if provided
  if (source.type) {
    const validTypes = ["postgres", "mysql", "mariadb", "sqlserver", "sqlite"];
    if (!validTypes.includes(source.type)) {
      throw new Error(
        `Configuration file ${configPath}: source '${source.id}' has invalid type '${source.type}'. ` +
          `Valid types: ${validTypes.join(", ")}`
      );
    }
  }

  // Validate AWS IAM auth fields
  if (
    source.aws_iam_auth !== undefined &&
    typeof source.aws_iam_auth !== "boolean"
  ) {
    throw new Error(
      `Configuration file ${configPath}: source '${source.id}' has invalid aws_iam_auth. ` +
        `Must be a boolean (true or false).`
    );
  }

  if (source.aws_region !== undefined) {
    if (
      typeof source.aws_region !== "string" ||
      source.aws_region.trim().length === 0
    ) {
      throw new Error(
        `Configuration file ${configPath}: source '${source.id}' has invalid aws_region. ` +
          `Must be a non-empty string (e.g., "eu-west-1").`
      );
    }
  }

  if (source.aws_iam_auth === true) {
    const validIamTypes = ["postgres", "mysql", "mariadb"];
    if (!source.type || !validIamTypes.includes(source.type)) {
      throw new Error(
        `Configuration file ${configPath}: source '${source.id}' has aws_iam_auth enabled, ` +
          `but this is only supported for postgres, mysql, and mariadb sources.`
      );
    }
    if (!source.aws_region) {
      throw new Error(
        `Configuration file ${configPath}: source '${source.id}' has aws_iam_auth enabled ` +