How to configure types only for a particular instance of node-postgres?

It appears that the only way to configure type parser is by doing so globally, i.e.

var types = require('pg').types
types.setTypeParser(20, function(val) {
  return parseInt(val)
});

– https://github.com/brianc/node-pg-types

I would like to restrict type parsing to a particular connection.

Is there an API at the moment to do so?

[charmander]

pg.types is a convenience reexport; pg itself doesn’t use that property. You can override type parsing by configuration (i.e. per client or pool) by passing something that satisfies the necessary interface in the types property, the most convenient something I’m aware of being a TypeOverrides from pg/lib/type-overrides.js:

const TypeOverrides = require('pg/lib/type-overrides');

const OID_INT8 = 20;

const types = new TypeOverrides();
types.setTypeParser(OID_INT8, BigInt);

const pool = new pg.Pool({
    ⋮
    types,
});

const client = new pg.Client({
    ⋮
    types,
});

[gajus]

Just in case anyone comes across this, if you are using pg-native, you also need to override client.native._types. See https://github.com/gajus/slonik/commit/009a2124264d267681ed9a680db10d94e3990dae.