12.0.0-alpha.13

💥 Breaking Change

• Rename JsError to JsExn and error modules cleanup. #7408
• Make BigInt.fromFloat return an option rather than throwing an error in case it's passed a value with a decimal value. #7419

🚀 New Feature

• Add shift (<<, >>, >>>) operators for int and bigint. #7183
• Add bitwise AND (&) operator for int and bigint. #7415
• Add bitwise NOT (~) operator for int and bigint. #7418
• Significantly reduced the download size by splitting binaries into optional platform-specific dependencies (e.g, @rescript/linux-x64). #7395
• JSX: do not error on ref as prop anymore (which is allowed in React 19). #7420
• Add new attribute @notUndefined for abstract types to prevent unnecessary wrapping with Primitive_option.some in JS output. #7458
• Preserve JSX: enable by adding "-bs-jsx-preserve" to "bsc-flags" (does require "jsx": { "version": 4 }). #7387
• Add slot prop to JsxDOM.domProps. #7487

🐛 Bug fix

• Fix broken bstracing CLI location. #7398
• Fix field flattening optimization to avoid creating unnecessary copies of allocating constants. #7421
• Fix leading comments removed when braces inside JSX contains let assignment. #7424
• Fix JSON escaping in code editor analysis: JSON was not always escaped properly, which prevented code actions from being available in certain situations. #7435
• Fix regression in pattern matching for optional fields containing variants. #7440
• Fix missing checks for duplicate literals in variants with payloads. #7441
• Fix printer removing private for empty record. #7448
• Fix: handle dynamic imports with module aliases. #7452
• Fix missing unescaping when accessing prop with exotic name. #7469
• Fix syntax error with mutable nested record. #7470

🏠 Internal

• AST: Add bar location to case. #7407
• Clean up lazy from ASTs and back-end. #7474
• Compile runtime with rewatch and add rewatch tests to the compiler repo. #7422

💅 Polish

• In type errors, recommend stdlib over Belt functions for converting between float/int/string. #7453
• Remove unused type Jsx.ref. #7459
• Add @notUndefined attribute to all relevant abstract types in Stdlib. #7464
• Editor: Add pipe completions from current module. #7471