## TL;DR

Upgrade plivo to 4.21.0 or later; the maintainer confirmed the fix there after reports that 4.17.1 and 4.20.1 were still broken.

## Steps

1. Upgrading the `plivo` npm package from 4.12.0 to 4.14.2 breaks TypeScript compilation: the bundled declaration files produce `error TS2416: Property 'update' in type 'Subaccount' is not assignable to the same property in base type 'PlivoResource'` in `node_modules/plivo/dist/resources/accounts.d.ts`. Just importing plivo and running tsc reproduces it. Also reported on 4.17.1 and 4.20.1.

2. The SDK shipped broken `.d.ts` declarations for several versions. Plivo fixed the declarations in the v4.21.0 release. Upgrade `plivo` to 4.21.0 or later; the maintainer confirmed the fix there after reports that 4.17.1 and 4.20.1 were still broken.

## When to use

You are seeing this: Just importing plivo and running tsc reproduces it. Use this skill when you run into "plivo TS2416: Property 'update' in type 'Subaccount' is not assignable to base type 'PlivoResource'".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

Versions mentioned in the source: 4.12.0, 4.14.2, 4.17.1, 4.20.1, v4.21.0, 4.21.0. If you are on something much newer or older, the details may have shifted.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

## Edge cases

- Also reported on 4.17.1 and 4.20.1.