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// stolen from https://github.com/segmentio/pg-escape/blob/master/index.js
export function literal(val: any) {    if (null == val) return 'NULL';    if (Array.isArray(val)) {        var vals: any[] = val.map(literal)        return "(" + vals.join(", ") + ")"    }    var backslash = ~val.indexOf('\\');    var prefix = backslash ? 'E' : '';    val = val.replace(/'/g, "''");    val = val.replace(/\\/g, '\\\\');    return prefix + "'" + val + "'";};