"Does not provide an export named 'Tooltip'," even though I can output Tooltip

Question

When this code runs:

// index.svelte   
import Chart, { Tooltip } from 'chart.js/auto.esm';
console.log({ Tooltip });

Tooltip is successfully output to the console, but I also get an error (in the browser):

The requested module '/node_modules/.vite/chart_js_auto.js?v=9674d8be' does not provide an export named 'Tooltip'

So SvelteKit is obviously running this code multiple times. Why does it work once, then fail later? How do I get it to work all the time?

I imported 'chart.js/auto.esm' instead of just 'chart.js' because SvelteKit needs ESM modules. I can import { Tooltip } from 'chart.js' and this works locally, but a there's a different build error on Vercel:

SyntaxError: Named export 'Tooltip' not found. The requested module 'chart.js' is a CommonJS module, which may not support all module.exports as named exports.