Interested in this to ensure that my pulumi program is only ran with a particular version.

I see this: https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/pulumi/#version.

I don't think that property is exported though.

It's in the docs though 🤔

I'd like to, for example, ensure that any dev running pulumi up has exactly v3.2.1.

This is similar to Terraform version constraints: https://www.terraform.io/docs/language/expressions/version-constraints.html

I can do this myself but it'd be cool to have it built in.

export function ensureVersionMatches(desiredVersion: string) {
    const result = proc.spawnSync("pulumi", ["version"], {
        stdio: ["pipe", "pipe", "inherit"]
    });
    if (result.status != 0) {
        throw new pulumi.RunError(`Pulumi version check exited with non-zero status ${result.status}.`)
    }
    const versionString = String(result.stdout)
    if (versionString != desiredVersion) {
        throw new pulumi.RunError(`Pulumi current version ${versionString} does not match desired version ${desiredVersion}`)
    }
    return versionString
}