/**
 * Reading a field out of JSON that has not finished arriving.
 *
 * A model writes a file in one tool call, and that call's arguments stream in over several seconds.
 * Reporting only the completed call meant the panel showed a file *after* it was written — the work
 * was over by the time there was anything to look at, which is the opposite of watching it happen.
 *
 * `JSON.parse` cannot help with a fragment: `{"path":"a.ts","content":"line one\\nline t` is not
 * JSON and never will be until the rest turns up. So this walks the one value it was asked for and
 * decodes exactly as much as has arrived, which is enough to paint.
 *
 * Done here rather than in the browser for two reasons. It is testable — the client is a template
 * string and cannot be imported by a test — and it means the event carries the fields themselves
 * rather than a JSON fragment for the page to pick apart, which is both smaller and one less place
 * for a half-escaped sequence to end up in the DOM.
 */
/**
 * As much of a string field as has arrived, or null when the field has not started.
 *
 * Null and empty string are different answers: null means "this field is not here yet", and empty
 * means "it is here and so far it is empty". A caller waiting for content to paint needs to tell
 * those apart, or it paints an empty panel the moment the key appears.
 */
export declare function partialString(json: string, field: string): string | null;
/** The first of several field names that has started arriving. */
export declare function partialAny(json: string, fields: readonly string[]): string | null;
/** The path and content of a write, as far as either has arrived. */
export interface PartialWrite {
    path: string | null;
    content: string | null;
}
/**
 * What a streaming write is about.
 *
 * The field names are the ones the file tools actually use — a model may be talking to `write_file`
 * or an edit tool, and the value to show is whichever of them is present.
 */
export declare function partialWrite(json: string): PartialWrite;
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