microsoft/vscode-react-native

import * as path from 'path';
import * as semver from 'semver';

// Check if the given string is a semver-compliant version number (e.g. '1.2.3')
// (missing minor/patch values will be added on server side to pass semver.satisfies check)
export function isValidVersion(version: string): boolean {
  return !!semver.valid(version) || /^\d+\.\d+$/.test(version) || /^\d+$/.test(version);
}

// Allow plain integer versions (as well as '1.0' values) for now, e.g. '1' is valid here and we assume that it is equal to '1.0.0'. 
export function isValidRange(semverRange: string): boolean {
  return !!semver.validRange(semverRange);
}

export function isValidRollout(rollout: number): boolean {
  return (rollout && rollout > 0 && rollout <= 100);
}