feat(enjoyBy): add opts.enjoyBy option to filter versions by date

README.md

@@ -74,3 +74,11 @@ The function will throw `ETARGET` if there was no matching manifest, and
 If `opts.defaultTag` is provided, it will be used instead of `latest`. That is,
 if that tag matches the selector, it will be used, even if a higher available
 version matches the range.
+
+If `opts.enjoyBy` is provided, it should be something that can be passed to `new
+Date(x)`, such as a `Date` object or a timestamp string. It will be used to
+filter the selected versions such that only versions less than or equal to
+`enjoyBy` are considered.
+
+If `opts.includeDeprecated` passed in as true, deprecated versions will be
+selected. By default, deprecated versions other than `defaultTag` are ignored.

index.js

@@ -6,19 +6,28 @@ const semver = require('semver')
 
 const PickerOpts = figgyPudding({
   defaultTag: { default: 'latest' },
+  enjoyBy: {},
   includeDeprecated: { default: false }
 })
 
 module.exports = pickManifest
 function pickManifest (packument, wanted, opts) {
   opts = PickerOpts(opts)
+  const time = opts.enjoyBy && packument.time && +(new Date(opts.enjoyBy))
   const spec = npa.resolve(packument.name, wanted)
   const type = spec.type
   if (type === 'version' || type === 'range') {
     wanted = semver.clean(wanted, true) || wanted
   }
   const distTags = packument['dist-tags'] || {}
-  const versions = Object.keys(packument.versions || {}).filter(v => semver.valid(v, true))
+  const versions = Object.keys(packument.versions || {}).filter(v => {
+    return semver.valid(v, true) && (
+      !time || (
+        packument.time[v] &&
+        time >= +(new Date(packument.time[v]))
+      )
+    )
+  })
   const undeprecated = versions.filter(v => !packument.versions[v].deprecated)
   let err
 
@@ -47,6 +56,7 @@ function pickManifest (packument, wanted, opts) {
     !target &&
     tagVersion &&
     packument.versions[tagVersion] &&
+    (!time || versions.indexOf(tagVersion) !== -1) &&
     semver.satisfies(tagVersion, wanted, true)
   ) {
     target = tagVersion
@@ -66,7 +76,11 @@ function pickManifest (packument, wanted, opts) {
     target = tagVersion
   }
 
-  const manifest = target && packument.versions[target]
+  const manifest = (
+    target &&
+    (!time || versions.indexOf(target) !== -1) &&
+    packument.versions[target]
+  )
   if (!manifest) {
     err = new Error(
       `No matching version found for ${packument.name}@${wanted}`

test/index.js

@@ -266,3 +266,28 @@ test('accepts opts.includeDeprecated option to disable skipping', t => {
   t.equal(manifest.version, '1.1.0', 'picked the right manifest')
   t.done()
 })
+
+test('accepts opts.enjoyBy option to do date-based cutoffs', t => {
+  const metadata = {
+    'dist-tags': {
+      latest: '3.0.0'
+    },
+    time: {
+      modified: '2018-01-03T00:00:00.000Z',
+      created: '2018-01-01T00:00:00.000Z',
+      '1.0.0': '2018-01-01T00:00:00.000Z',
+      '2.0.0': '2018-01-02T00:00:00.000Z',
+      '3.0.0': '2018-01-03T00:00:00.000Z'
+    },
+    versions: {
+      '1.0.0': { version: '1.0.0' },
+      '2.0.0': { version: '2.0.0' },
+      '3.0.0': { version: '3.0.0' }
+    }
+  }
+  const manifest = pickManifest(metadata, '*', {
+    enjoyBy: '2018-01-02'
+  })
+  t.equal(manifest.version, '2.0.0', 'filtered out 3.0.0 because of dates')
+  t.done()
+})