export type JsonRpcId = number | string;
export interface JsonRpcRequest {
    jsonrpc: '2.0';
    id: JsonRpcId;
    method: string;
    params?: unknown;
}
export interface JsonRpcNotification {
    jsonrpc: '2.0';
    method: string;
    params?: unknown;
}
export interface JsonRpcResponse {
    jsonrpc: '2.0';
    id: JsonRpcId | null;
    result?: unknown;
    error?: {
        code: number;
        message: string;
        data?: unknown;
    };
}
export type JsonRpcMessage = JsonRpcRequest | JsonRpcNotification | JsonRpcResponse;
export interface Position {
    line: number;
    character: number;
}
export interface Range {
    start: Position;
    end: Position;
}
export interface Location {
    uri: string;
    range: Range;
}
export interface TextDocumentIdentifier {
    uri: string;
}
export interface VersionedTextDocumentIdentifier extends TextDocumentIdentifier {
    version: number;
}
export interface TextDocumentItem extends VersionedTextDocumentIdentifier {
    languageId: string;
    text: string;
}
export interface TextDocumentContentChangeEvent {
    range?: Range;
    text: string;
}
export interface Diagnostic {
    range: Range;
    severity: 1 | 2 | 3 | 4;
    source: 'crowdy-rust';
    code: string;
    message: string;
}
export interface CompletionItem {
    label: string;
    kind: number;
    detail?: string;
    documentation?: string;
    insertText?: string;
    sortText?: string;
}
export interface Hover {
    contents: {
        kind: 'markdown';
        value: string;
    };
    range?: Range;
}
export interface DocumentSymbol {
    name: string;
    detail?: string;
    kind: number;
    range: Range;
    selectionRange: Range;
}
export declare const JSON_RPC_ERRORS: {
    readonly parseError: -32700;
    readonly invalidRequest: -32600;
    readonly methodNotFound: -32601;
    readonly invalidParams: -32602;
    readonly internalError: -32603;
    readonly requestCancelled: -32800;
    readonly contentModified: -32801;
};
export declare function isRecord(value: unknown): value is Record<string, unknown>;
export declare function decodeJsonRpcMessage(value: unknown): {
    ok: true;
    message: JsonRpcMessage;
} | {
    ok: false;
    code: number;
    message: string;
    id: JsonRpcId | null;
};
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