dsh-is-power-of-two

In model inference pipelines, parameters such as attention head counts, KV-cache shard sizes, and quantization group sizes are expected to be powers of two; a single misconfiguration can cause silent corruption or runtime failures far downstream. dsh-is-power-of-two reduces that check to a single zero-dependency pure Node function: no network I/O, no async overhead, just a boolean returned immediately.

Its entire job is one: given a non-negative integer, return whether it is a power of two. There are no callbacks, no promises, no configuration surface. Under the hood it relies on the classic bit trick n & (n - 1), yielding an O(1) check that stays invisible even on hot paths that validate parameters thousands of times per second.

It fits naturally into inference-service startup self-checks, parameter-validation middleware, or CLI scaffolding where a lightweight assertion is needed. Licensed under MIT, it is a single portable file that drops into any Node project without adding a transitive dependency tree.