/**
 * Pure/sync helpers for editing the `.hublaunch/hublaunch.config.js` source
 * file as text. Kept side-effect free (no filesystem access) so the string
 * transformations are unit-testable in isolation — same rationale as
 * `appendGitignoreEntry` in `src/commands/init.ts`. Callers own reading and
 * writing the file.
 */
/**
 * Insert or replace the `provider` block in a config file's source text.
 *
 * Mirrors the comment-out-then-insert approach used by `saveApiKeyToConfig` in
 * `src/commands/login.ts` for `hulaApiKey`:
 *   - Any existing `provider:` line — whether active or commented out (including
 *     the placeholder init writes) — is commented out.
 *   - The new active line is inserted immediately after the config opening
 *     (`export const config = {` or `export default {`).
 *
 * The block is written on a SINGLE line (`provider: { type: '…', apiKey: '…' },`)
 * so the comment-out regex is robust — a multi-line object would leave dangling
 * inner lines. `init` emits the same single-line shape.
 *
 * If no config opening is found the content is returned unchanged (the caller
 * degrades gracefully rather than corrupting the file). Never echoes the key
 * anywhere but the returned string.
 */
export declare function upsertProviderApiKey(content: string, providerType: string, key: string): string;
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