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1# npm-pick-manifest [![npm version](https://img.shields.io/npm/v/npm-pick-manifest.svg)](https://npm.im/npm-pick-manifest) [![license](https://img.shields.io/npm/l/npm-pick-manifest.svg)](https://npm.im/npm-pick-manifest) [![Travis](https://img.shields.io/travis/npm/npm-pick-manifest.svg)](https://travis-ci.org/npm/npm-pick-manifest) [![Coverage Status](https://coveralls.io/repos/github/npm/npm-pick-manifest/badge.svg?branch=latest)](https://coveralls.io/github/npm/npm-pick-manifest?branch=latest)
2
3[`npm-pick-manifest`](https://github.com/npm/npm-pick-manifest) is a standalone
4implementation of [npm](https://npmjs.com)'s semver range resolution algorithm.
5
6## Install
7
8`$ npm install --save npm-pick-manifest`
9
10## Table of Contents
11
12* [Example](#example)
13* [Features](#features)
14* [API](#api)
15 * [`pickManifest()`](#pick-manifest)
16
17### Example
18
19```javascript
20const pickManifest = require('npm-pick-manifest')
21
22fetch('https://registry.npmjs.org/npm-pick-manifest').then(res => {
23 return res.json()
24}).then(packument => {
25 return pickManifest(packument, '^1.0.0')
26}) // get same manifest as npm would get if you `npm i npm-pick-manifest@^1.0.0`
27```
28
29### Features
30
31* Uses npm's exact [semver resolution algorithm](http://npm.im/semver).
32* Supports ranges, tags, and versions.
33* Prefers non-deprecated versions to deprecated versions.
34* Prefers versions whose `engines` requirements are satisfied over those
35 that will raise a warning or error at install time.
36
37### API
38
39#### <a name="pick-manifest"></a> `> pickManifest(packument, selector, [opts]) -> manifest`
40
41Returns the manifest that best matches `selector`, or throws an error.
42
43Packuments are anything returned by metadata URLs from the npm registry. That
44is, they're objects with the following shape (only fields used by
45`npm-pick-manifest` included):
46
47```javascript
48{
49 name: 'some-package',
50 'dist-tags': {
51 foo: '1.0.1'
52 },
53 versions: {
54 '1.0.0': { version: '1.0.0' },
55 '1.0.1': { version: '1.0.1' },
56 '1.0.2': { version: '1.0.2' },
57 '2.0.0': { version: '2.0.0' }
58 }
59}
60```
61
62The algorithm will follow npm's algorithm for semver resolution, and only
63`tag`, `range`, and `version` selectors are supported.
64
65The function will throw `ETARGET` if there was no matching manifest, and
66`ENOVERSIONS` if the packument object has no valid versions in `versions`.
67If the only matching manifest is included in a `policyRestrictions` section
68of the packument, then an `E403` is raised.
69
70#### <a name="pick-manifest-options"></a> Options
71
72All options are optional.
73
74* `includeStaged` - Boolean, default `false`. Include manifests in the
75 `stagedVersions.versions` set, to support installing [staged
76 packages](https://github.com/npm/rfcs/pull/92) when appropriate. Note
77 that staged packages are always treated as lower priority than actual
78 publishes, even when `includeStaged` is set.
79* `defaultTag` - String, default `'latest'`. The default `dist-tag` to
80 install when no specifier is provided. Note that the version indicated
81 by this specifier will be given top priority if it matches a supplied
82 semver range.
83* `before` - String, Date, or Number, default `null`. This is passed to
84 `new Date()`, so anything that works there will be valid. Do not
85 consider _any_ manifests that were published after the date indicated.
86 Note that this is only relevant when the packument includes a `time`
87 field listing the publish date of all the packages.
88* `nodeVersion` - String, default `process.version`. The Node.js version
89 to use when checking manifests for `engines` requirement satisfaction.
90* `npmVersion` - String, default `null`. The npm version to use when
91 checking manifest for `engines` requirement satisfaction. (If `null`,
92 then this particular check is skipped.)
93* `avoid` - String, default `null`. A SemVer range of
94 versions that should be avoided. An avoided version MAY be selected if
95 there is no other option, so when using this for version selection ensure
96 that you check the result against the range to see if there was no
97 alternative available.
98* `avoidStrict` Boolean, default `false`. If set to true, then
99 `pickManifest` will never return a version in the `avoid` range. If the
100 only available version in the `wanted` range is a version that should be
101 avoided, then it will return a version _outside_ the `wanted` range,
102 preferring to do so without making a SemVer-major jump, if possible. If
103 there are no versions outside the `avoid` range, then throw an
104 `ETARGET` error. It does this by calling pickManifest first with the
105 `wanted` range, then with a `^` affixed to the version returned by the
106 `wanted` range, and then with a `*` version range, and throwing if
107 nothing could be found to satisfy the avoidance request.
108
109Return value is the manifest as it exists in the packument, possibly
110decorated with the following boolean flags:
111
112* `_shouldAvoid` The version is in the `avoid` range. Watch out!
113* `_outsideDependencyRange` The version is outside the `wanted` range,
114 because `avoidStrict: true` was set.
115* `_isSemVerMajor` The `_outsideDependencyRange` result is a SemVer-major
116 step up from the version returned by the `wanted` range.
117
118### Algorithm
119
1201. Create list of all versions in `versions`,
121 `policyRestrictions.versions`, and (if `includeStaged` is set)
122 `stagedVersions.versions`.
1232. If a `dist-tag` is requested,
124 1. If the manifest is not after the specified `before` date, then
125 select that from the set.
126 2. If the manifest is after the specified `before` date, then re-start
127 the selection looking for the highest SemVer range that is equal to
128 or less than the `dist-tag` target.
1293. If a specific version is requested,
130 1. If the manifest is not after the specified `before` date, then
131 select the specified manifest.
132 2. If the manifest is after the specified `before` date, then raise
133 `ETARGET` error. (NB: this is a breaking change from v5, where a
134 specified version would override the `before` setting.)
1354. (At this point we know a range is requested.)
1365. If the `defaultTag` refers to a `dist-tag` that satisfies the range (or
137 if the range is `'*'` or `''`), and the manifest is published before the
138 `before` setting, then select that manifest.
1396. If nothing is yet selected, sort by the following heuristics in order,
140 and select the top item:
141 1. Prioritize versions that are not in the `avoid` range over those
142 that are.
143 2. Prioritize versions that are not in `policyRestrictions` over those
144 that are.
145 3. Prioritize published versions over staged versions.
146 4. Prioritize versions that are not deprecated, and which have a
147 satisfied engines requirement, over those that are either deprecated
148 or have an engines mismatch.
149 5. Prioritize versions that have a satisfied engines requirement over
150 those that do not.
151 6. Prioritize versions that are not are not deprecated (but have a
152 mismatched engines requirement) over those that are deprecated.
153 7. Prioritize higher SemVer precedence over lower SemVer precedence.
1547. If no manifest was selected, raise an `ETARGET` error.
1558. If the selected item is in the `policyRestrictions.versions` list, raise
156 an `E403` error.
1579. Return the selected manifest.
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