query-type.js

class Query {
	constructor(text, values) {
		this.text = text;
		this.values = values;
	}
}

const sql = (parts, ...values) => {
	let text = parts[0];

	for (let i = 1; i < parts.length; i++) {
		text += '$' + i + parts[i];
	}

	return new Query(text, values);
};

const query = q => {
	if (!(q instanceof Query)) {
		throw new TypeError('query must be a Query object');
	}

	return db.query(q);
};

query(sql`INSERT INTO t (c) VALUES (${'safe'})`);