When Deno and Bun first came out, they promised a hard break from the Node ecosystem
I don't think that's true for Bun. In fact Bun was planned to NOT break from Node ecosystem as much as possible:
"Bun is designed as a drop-in replacement for your current JavaScript & TypeScript apps or scripts — on your local computer, server or on the edge. Bun natively implements hundreds of Node.js and Web APIs, including ~90% of Node-API functions (native modules), fs, path, Buffer and more." - 2022
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I don't think that's true for Bun. In fact Bun was planned to NOT break from Node ecosystem as much as possible:
"Bun is designed as a drop-in replacement for your current JavaScript & TypeScript apps or scripts — on your local computer, server or on the edge. Bun natively implements hundreds of Node.js and Web APIs, including ~90% of Node-API functions (native modules), fs, path, Buffer and more." - 2022
https://archive.is/lWjNn#selection-399.0-403.55