Function parseContextFields

packages/cli/src/commands/preview.ts:330–345

(value: string | undefined)

}

function parseContextFields(value: string | undefined): ContextField[] {
  if (value === undefined) return DEFAULT_CONTEXT_FIELDS;
  if (!value.trim()) throw new Error("--context-fields cannot be empty");
  const allowed = new Set<ContextField>(DEFAULT_CONTEXT_FIELDS);
  const fields = value
    .split(",")
    .map((field) => field.trim())
    .filter(Boolean);
  const invalid = fields.filter((field) => !allowed.has(field as ContextField));
  if (invalid.length > 0) {
    throw new Error(
      `Unknown context field${invalid.length === 1 ? "" : "s"}: ${invalid.join(", ")}`,
    );
  }
  return [...new Set(fields)] as ContextField[];
}

function contextIncludes(fields: ContextField[], field: ContextField): boolean {
  return fields.includes(field);