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5 changes: 5 additions & 0 deletions src/univers/version_range.py
Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,11 @@ def from_string(cls, vers, simplify=False, validate=False):
Return a VersionRange built from a ``vers`` version range spec string,
such as "vers:npm/1.2.3,>=2.0.0"
"""
if not vers or not isinstance(vers, str) or not vers.strip():
raise ValueError(
f"{vers!r} is not a valid argument, a valid ``vers`` string argument is required."
)

# Spaces are not significant and removed in a canonical form.
vers = remove_spaces(vers)

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