Founded in 2020 by CEO Paul Copplestone and CTO Ant Wilson, Supabase positions itself as an open-source alternative to Firebase built on PostgreSQL. The startup has gained traction amid rising interest in so-called “vibe coding” tools and AI-driven app development, and has raised about $380 million across three funding rounds since September 2024, lifting its valuation to $5 billion.
It is also necessary to emphasize that many optimizations are only possible in parts of the spec that are unobservable to user code. The alternative, like Bun "Direct Streams", is to intentionally diverge from the spec-defined observable behaviors. This means optimizations often feel "incomplete". They work in some scenarios but not in others, in some runtimes but not others, etc. Every such case adds to the overall unsustainable complexity of the Web streams approach which is why most runtime implementers rarely put significant effort into further improvements to their streams implementations once the conformance tests are passing.
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BuildKit’s design is clean and surprisingly understandable once you see the layers. There are three key concepts.