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semver(1) -- The semantic versioner for npm
===========================================
## Usage
$ npm install semver
semver.valid('1.2.3') // '1.2.3'
semver.valid('a.b.c') // null
semver.clean(' =v1.2.3 ') // '1.2.3'
semver.satisfies('1.2.3', '1.x || >=2.5.0 || 5.0.0 - 7.2.3') // true
semver.gt('1.2.3', '9.8.7') // false
semver.lt('1.2.3', '9.8.7') // true
As a command-line utility:
$ semver -h
Usage: semver <version> [<version> [...]] [-r <range> | -i <inc> | -d <dec>]
Test if version(s) satisfy the supplied range(s), and sort them.
Multiple versions or ranges may be supplied, unless increment
or decrement options are specified. In that case, only a single
version may be used, and it is incremented by the specified level
Program exits successfully if any valid version satisfies
all supplied ranges, and prints all satisfying versions.
If no versions are valid, or ranges are not satisfied,
then exits failure.
Versions are printed in ascending order, so supplying
multiple versions to the utility will just sort them.
## Versions
A "version" is described by the v2.0.0 specification found at
<http://semver.org/>.
A leading `"="` or `"v"` character is stripped off and ignored.
## Ranges
The following range styles are supported:
* `1.2.3` A specific version. When nothing else will do. Note that
build metadata is still ignored, so `1.2.3+build2012` will satisfy
this range.
* `>1.2.3` Greater than a specific version.
* `<1.2.3` Less than a specific version. If there is no prerelease
tag on the version range, then no prerelease version will be allowed
either, even though these are technically "less than".
* `>=1.2.3` Greater than or equal to. Note that prerelease versions
are NOT equal to their "normal" equivalents, so `1.2.3-beta` will
not satisfy this range, but `2.3.0-beta` will.
* `<=1.2.3` Less than or equal to. In this case, prerelease versions
ARE allowed, so `1.2.3-beta` would satisfy.
* `1.2.3 - 2.3.4` := `>=1.2.3 <=2.3.4`
* `~1.2.3` := `>=1.2.3-0 <1.3.0-0` "Reasonably close to 1.2.3". When
using tilde operators, prerelease versions are supported as well,
but a prerelease of the next significant digit will NOT be
satisfactory, so `1.3.0-beta` will not satisfy `~1.2.3`.
* `^1.2.3` := `>=1.2.3-0 <2.0.0-0` "Compatible with 1.2.3". When
using caret operators, anything from the specified version (including
prerelease) will be supported up to, but not including, the next
major version (or its prereleases). `1.5.1` will satisfy `^1.2.3`,
while `1.2.2` and `2.0.0-beta` will not.
* `^0.1.3` := `>=0.1.3-0 <0.2.0-0` "Compatible with 0.1.3". 0.x.x versions are
special: the first non-zero component indicates potentially breaking changes,
meaning the caret operator matches any version with the same first non-zero
component starting at the specified version.
* `^0.0.2` := `=0.0.2` "Only the version 0.0.2 is considered compatible"
* `~1.2` := `>=1.2.0-0 <1.3.0-0` "Any version starting with 1.2"
* `^1.2` := `>=1.2.0-0 <2.0.0-0` "Any version compatible with 1.2"
* `1.2.x` := `>=1.2.0-0 <1.3.0-0` "Any version starting with 1.2"
* `~1` := `>=1.0.0-0 <2.0.0-0` "Any version starting with 1"
* `^1` := `>=1.0.0-0 <2.0.0-0` "Any version compatible with 1"
* `1.x` := `>=1.0.0-0 <2.0.0-0` "Any version starting with 1"
Ranges can be joined with either a space (which implies "and") or a
`||` (which implies "or").
## Functions
All methods and classes take a final `loose` boolean argument that, if
true, will be more forgiving about not-quite-valid semver strings.
The resulting output will always be 100% strict, of course.
Strict-mode Comparators and Ranges will be strict about the SemVer
strings that they parse.
* valid(v): Return the parsed version, or null if it's not valid.
* inc(v, release): Return the version incremented by the release type
(major, minor, patch, or prerelease), or null if it's not valid.
### Comparison
* gt(v1, v2): `v1 > v2`
* gte(v1, v2): `v1 >= v2`
* lt(v1, v2): `v1 < v2`
* lte(v1, v2): `v1 <= v2`
* eq(v1, v2): `v1 == v2` This is true if they're logically equivalent,
even if they're not the exact same string. You already know how to
compare strings.
* neq(v1, v2): `v1 != v2` The opposite of eq.
* cmp(v1, comparator, v2): Pass in a comparison string, and it'll call
the corresponding function above. `"==="` and `"!=="` do simple
string comparison, but are included for completeness. Throws if an
invalid comparison string is provided.
* compare(v1, v2): Return 0 if v1 == v2, or 1 if v1 is greater, or -1 if
v2 is greater. Sorts in ascending order if passed to Array.sort().
* rcompare(v1, v2): The reverse of compare. Sorts an array of versions
in descending order when passed to Array.sort().
### Ranges
* validRange(range): Return the valid range or null if it's not valid
* satisfies(version, range): Return true if the version satisfies the
range.
* maxSatisfying(versions, range): Return the highest version in the list
that satisfies the range, or null if none of them do.
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