/**
 * Resolves a field path from a JSON object.
 *
 * Supported formats:
 *   message                    → obj.message
 *   msg.content                → obj.msg.content
 *   data["key"]                → obj.data.key
 *   data['key']                → obj.data.key
 *   items[0].text              → obj.items[0].text
 *   data[0]["content"].text    → obj.data[0].content.text
 *   a.b[1]['c']["d"][2].e      → fully mixed paths
 *
 * Falls back to treating `path` as a literal value when it contains
 * whitespace or characters that cannot appear in a valid field path
 * (e.g. when an n8n expression resolved to the message text itself).
 */
export declare function resolveField(obj: unknown, path: string): unknown;
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