check_package.js

const pack = require('./package.json');

const validateDeps = (packageJson, dependencyType, offenderRegex, message = `Invalid version syntax in ${dependencyType} based on ${offenderRegex}!`) => {
  const deps = new Map(Object.entries(pack[dependencyType]));

  [...deps.keys()]
    .filter((name) => deps.get(name).match(offenderRegex))
    .forEach((name) => {
      console.log(`${name}: ${deps.get(name)} -- ${message}`);
    });
};

validateDeps(pack, 'devDependencies', /^\^/);
validateDeps(pack, 'dependencies', /^(\^|~)/);