export interface SyntaxCheckResult {
    /** Parse errors in the new content (capped at {@link MAX_ERRORS}). */
    errors: string[];
    /** True when the pre-edit content already failed to parse — the edit did
     *  not introduce the breakage (though it didn't fix it either). */
    preExisting: boolean;
}
/**
 * Check `content` for syntax errors based on the file extension.
 * Returns `undefined` when the file type is not checkable (or the checker
 * is unavailable) and a result with an empty `errors` array when clean.
 * Pass `previousContent` to distinguish newly-introduced errors from
 * pre-existing ones.
 */
export declare function checkSyntax(filePath: string, content: string, previousContent?: string): Promise<SyntaxCheckResult | undefined>;
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