import { SqlComponent } from "./SqlComponent";
import { IdentifierString, ValueList, ValueComponent } from "./ValueComponent";
import { ReturningClause, SetClause, SetClauseItem, SourceExpression, WhereClause, WithClause } from "./Clause";
export type MergeMatchType = "matched" | "not_matched" | "not_matched_by_source" | "not_matched_by_target";
export declare abstract class MergeAction extends SqlComponent {
    static kind: symbol;
}
export declare class MergeUpdateAction extends MergeAction {
    static kind: symbol;
    setClause: SetClause;
    whereClause: WhereClause | null;
    constructor(setClause: SetClause | SetClauseItem[], whereClause?: WhereClause | null);
}
export declare class MergeDeleteAction extends MergeAction {
    static kind: symbol;
    whereClause: WhereClause | null;
    constructor(whereClause?: WhereClause | null);
}
export declare class MergeInsertAction extends MergeAction {
    static kind: symbol;
    columns: IdentifierString[] | null;
    values: ValueList | null;
    defaultValues: boolean;
    private valuesLeadingComments;
    constructor(params: {
        columns?: (IdentifierString | string)[] | null;
        values?: ValueList | null;
        defaultValues?: boolean;
        valuesLeadingComments?: string[] | null;
    });
    addValuesLeadingComments(comments: string[]): void;
    getValuesLeadingComments(): string[];
}
export declare class MergeDoNothingAction extends MergeAction {
    static kind: symbol;
}
export declare class MergeWhenClause extends SqlComponent {
    static kind: symbol;
    matchType: MergeMatchType;
    condition: ValueComponent | null;
    action: MergeAction;
    private thenLeadingComments;
    constructor(matchType: MergeMatchType, action: MergeAction, condition?: ValueComponent | null, options?: {
        thenLeadingComments?: string[] | null;
    });
    addThenLeadingComments(comments: string[]): void;
    getThenLeadingComments(): string[];
}
export declare class MergeQuery extends SqlComponent {
    static kind: symbol;
    withClause: WithClause | null;
    target: SourceExpression;
    source: SourceExpression;
    onCondition: ValueComponent;
    whenClauses: MergeWhenClause[];
    returningClause: ReturningClause | null;
    constructor(params: {
        withClause?: WithClause | null;
        target: SourceExpression;
        source: SourceExpression;
        onCondition: ValueComponent;
        whenClauses: MergeWhenClause[];
        returningClause?: ReturningClause | null;
    });
}