Sourcemap of script containing the `ai` library produces invalid sourcemap

[nipunn1313]

Repro

import { streamText } from "ai";
console.log(streamText);

ai at version 4.1.50
esbuild at version 0.25.0

npx esbuild repro.js --bundle --sourcemap --outfile=dist/repro.js

The generated dist/repro.js.map fails to parse on a variety of tools. Eg.
https://evanw.github.io/source-map-visualization/
https://www.npmjs.com/package/source-map-explorer
https://crates.io/crates/sourcemap

Errors are usually of this variety

The "mappings" field of the imported source map contains invalid data. Invalid VLQ data at index 147599: Original source index 124 is invalid (there are 123 sources).

repro.js.map.txt