Npm version annotation

No prefix

"vuepress": "1.9.7" - I rely on this specific version.

~ tilde

"vuepress": "~1.9.7" - I rely on this specific version or latest patch.

^ caret

"vuepress": "^1.9.7" - I rely on this specific version, or latest minor version, or latest patch.

Semver

1.9.7 major.minor.patch