Jarred Sumner(@jarredsumner):AoT uses Bun’s bundler & parser to parse typescript, tags types to JavaScriptCore via a typecheck bytecode intrinsic, and compiles the bytecode to machine code via B3 (what JSC’s JITs use) This keeps the JavaScriptCore changes well-contained, so that syncing with upstream WebKit isn’t complicated

Jarred Sumner

@jarredsumner

building @bunjavascript at @anthropicai. formerly: @stripe (twice) @thielfellowship. high school dropout. npm i -g bun

Joined May 2014

647 Following 200.3K Followers

Jarred Sumner@jarredsumner

2026.09.29 02:05

AoT uses Bun’s bundler & parser to parse typescript, tags types to JavaScriptCore via a typecheck bytecode intrinsic, and compiles the bytecode to machine code via B3 (what JSC’s JITs use) This keeps the JavaScriptCore changes well-contained, so that syncing with upstream WebKit isn’t complicated