feat: add conditions to errors, export POSTGRES_ERRORS_BY_CODE and P…

[KristjanTammekivi]

Previously I've used a hack to override the error constructor but I feel like it's time to implement it directly in pg-protocol.

Features added:

• condition property on errors
• exported POSTGRES_ERROR_CODES and POSTGRES_ERRORS_BY_CODE (so it's easier to do stuff like if (error.code === POSTGRES_ERROR_CODES.UNIQUE_VIOLATION))
• added a script to generate the aforementioned dictionaries
• added a tighter typing on postgres error code

[matthieusieben]

You should make this optional, for example by using another package:

const { getPgErrorCondition } = require('pg-error-details')

const condition = getPgErrorCondition(pgErr)

[KristjanTammekivi]

You should make this optional, for example by using another package:

const { getPgErrorCondition } = require('pg-error-details')

const condition = getPgErrorCondition(pgErr)

Well, it's just a new property on the error so I'd say it's optional

[matthieusieben]

The 20kb addition to the package size are not really optional :/