/**
 * Serialize a query-params object into a `?a=1&b=2` string, matching Axios'
 * default `paramsSerializer` so the backend keeps receiving the exact same
 * wire format it did under the Axios client. The notable Axios conventions
 * reproduced here:
 *
 *   - `null` / `undefined` values are omitted.
 *   - A top-level array uses the bracket form: `ids=[1,2]` → `ids[]=1&ids[]=2`.
 *   - Arrays nested inside an object are indexed:
 *     `filter={tags:[a,b]}` → `filter[tags][0]=a&filter[tags][1]=b`.
 *   - Nested objects use bracket paths: `filter={x:1}` → `filter[x]=1`.
 *
 * Encoding matches Axios' `AxiosURLSearchParams` byte-for-byte: `encodeURIComponent`
 * then un-escape the characters Axios leaves literal (`:`, `$`, `,`) and render
 * space as `+`. Brackets stay percent-encoded (`%5B`/`%5D`), as Axios does for
 * object/array params. (Plain `URLSearchParams` diverges here — it encodes `:`
 * and `,` — so we encode by hand.)
 */
export declare const serializeParams: (params?: Record<string, any>) => string;
/**
 * Join a base URL and an endpoint the way Axios' `combineURLs` did: exactly one
 * slash between them regardless of whether the endpoint has a leading slash.
 * Most endpoints are relative (`connection/connectors`), a few are rooted
 * (`/initWorkspace`) — both must yield `…/v1/<endpoint>`. Naive concatenation
 * produced `…/v1connection/...`. Absolute endpoints pass through untouched,
 * matching Axios.
 */
export declare const combineUrl: (baseUrl: string, endpoint: string) => string;
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