typescript / expert
Snippet
Monomorphic Shape Enforcement via Strict Constructor Field Sequencing
Optimizes V8 inline caching by forcing identical property initialization order and prototype links. This guarantees monomorphic object hidden classes (shapes), preventing polymorphic IC degradation in high-throughput engines.
snippet.ts
typescript
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type EnforceMonomorphic<T> = {[K in keyof T]: T[K];};function createMonomorphicEntity<T extends object>(shape: EnforceMonomorphic<T>): Readonly<T> {const instance = Object.create(null);for (const key of Reflect.ownKeys(shape) as (keyof T)[]) {instance[key] = shape[key];}return Object.freeze(instance);}
Breakdown
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type EnforceMonomorphic<T> =
Maps over keys to lock structural shape layout definitions at compile time.
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const instance = Object.create(null);
Instantiates clean object free of prototype chain lookup overhead.
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for (const key of Reflect.ownKeys(shape))
Iterates keys in deterministic order to enforce identical hidden class transitions in the JIT compiler.