Generated Parser refers to C++ Classes (std::set<std::string>), unable to compile TS

I am using antlr4ts 0.5.0-alpha.4 to generate a parser for the SQL dialect ClickHouse with the following Grammar:

While the lexer is fine, to my surprise, the generated ClickHouseParser.ts (link to Gist) contains type references which look like C++-Sets to me (excerp from row 13035):

(...)
export class EngineClauseContext extends ParserRuleContext {
    public clauses: std::set<std::string>;
    public engineExpr(): EngineExprContext {
        return this.getRuleContext(0, EngineExprContext);
    }
    public orderByClause(): OrderByClauseContext[];
    public orderByClause(i: number): OrderByClauseContext;
    public orderByClause(i?: number): OrderByClauseContext | OrderByClauseContext[] {
(...)

This line up with the used methods on clauses,

count() and
insert()

which are both present in the C++ standard libraries' Set implementation, but not in the JavaScript built-in Set implementation, which uses size/add.

For comparison, I also generated a parser using the "standard" antlr, v. 4.9.3 which was able to produce a functioning Javascript parser. Is this issue linked to a bug in antlr4ts, or a problem with the grammar? Thank you for any pointers!

tunnelvisionlabs / antlr4ts

Generated Parser refers to C++ Classes (std::set<std::string>), unable to compile TS #524