Semver

Given a version number MAJOR.MINOR.PATCH:
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| MAJOR | incompatible API changes |
| MINOR | add functionality (backwards-compatible) |
| PATCH | bug fixes (backwards-compatible) |

Simple ranges

  1.2.3
 =1.2.3
 >1.2.3
 <1.2.3
>=1.2.3

Note that suffixed versions (1.2.3-rc1) are not matched.

Ranges

Range	Description	Notes
~1.2.3	is >=1.2.3 <1.3.0
—	—	—
^1.2.3	is >=1.2.3 <2.0.0
^0.2.3	is >=0.2.3 <0.3.0	(0.x.x is special)
^0.0.1	is =0.0.1	(0.0.x is special)
—	—	—
^1.2	is >=1.2.0 <2.0.0	(like ^1.2.0)
~1.2	is >=1.2.0 <1.3.0	(like ~1.2.0)
—	—	—
^1	is >=1.0.0 <2.0.0
~1	same
1.x	same
1.*	same
1	same
—	—	—
*	any version
x	same
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Hyphenated ranges

Range	Description
1.2.3 - 2.3.4	is >=1.2.3 <=2.3.4

Partial right

Range	Description
1.2.3 - 2.3	is >=1.2.3 <2.4.0
1.2.3 - 2	is >=1.2.3 <3.0.0

Partial left

Range	Description
1.2 - 2.3.0	is 1.2.0 - 2.3.0

When the right is partial (eg, 2.3), missing pieces are assumed to be x (eg, 2.3.x).

When the left is partial (eg, 1.2), missing pieces are assumed to be 0 (eg, 1.2.0).

Combining ranges

Range	Description
>=0.14 <16	And (space-separated)
`0.14.x

Pre-releases

1.2.3-prerelease+build

Explanation

| ^ | means “compatible with” |
| ~ | means “reasonably close to” |
| 0.x.x | is for “initial development” |
| 1.x.x | means public API is defined |
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References

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• http://semver.org/
• https://docs.npmjs.com/misc/semver