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Bun implements a semantic versioning API which can be used to compare versions and determine if a version is compatible with another range of versions. The versions and ranges are designed to be compatible with node-semver, which is used by npm clients. It’s about 20x faster than node-semver.
Benchmark
Currently, this API provides two functions:

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Bun.semver.satisfies(version: string, range: string): boolean

Returns true if version satisfies range, otherwise false. Example: 
import { semver } from "bun";

semver.satisfies("1.0.0", "^1.0.0"); // true
semver.satisfies("1.0.0", "^1.0.1"); // false
semver.satisfies("1.0.0", "~1.0.0"); // true
semver.satisfies("1.0.0", "~1.0.1"); // false
semver.satisfies("1.0.0", "1.0.0"); // true
semver.satisfies("1.0.0", "1.0.1"); // false
semver.satisfies("1.0.1", "1.0.0"); // false
semver.satisfies("1.0.0", "1.0.x"); // true
semver.satisfies("1.0.0", "1.x.x"); // true
semver.satisfies("1.0.0", "x.x.x"); // true
semver.satisfies("1.0.0", "1.0.0 - 2.0.0"); // true
semver.satisfies("1.0.0", "1.0.0 - 1.0.1"); // true
If range is invalid, it returns false. If version is invalid, it returns false.

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Bun.semver.order(versionA: string, versionB: string): 0 | 1 | -1

Returns 0 if versionA and versionB are equal, 1 if versionA is greater than versionB, and -1 if versionA is less than versionB. Example: 
import { semver } from "bun";

semver.order("1.0.0", "1.0.0"); // 0
semver.order("1.0.0", "1.0.1"); // -1
semver.order("1.0.1", "1.0.0"); // 1

const unsorted = ["1.0.0", "1.0.1", "1.0.0-alpha", "1.0.0-beta", "1.0.0-rc"];
unsorted.sort(semver.order); // ["1.0.0-alpha", "1.0.0-beta", "1.0.0-rc", "1.0.0", "1.0.1"]
console.log(unsorted);
If you need other semver functions, feel free to open an issue or pull request.