Installing dependencies.

node_modules/semantic-release/lib/get-release-to-add.js

@@ -0,0 +1,60 @@
+const {uniqBy, intersection} = require('lodash');
+const semver = require('semver');
+const semverDiff = require('semver-diff');
+const getLastRelease = require('./get-last-release');
+const {makeTag, getLowerBound} = require('./utils');
+
+/**
+ * Find releases that have been merged from from a higher branch but not added on the channel of the current branch.
+ *
+ * @param {Object} context semantic-release context.
+ *
+ * @return {Array<Object>} Last release and next release to be added on the channel of the current branch.
+ */
+module.exports = (context) => {
+  const {
+    branch,
+    branches,
+    options: {tagFormat},
+  } = context;
+
+  const higherChannels = branches
+    // Consider only releases of higher branches
+    .slice(branches.findIndex(({name}) => name === branch.name) + 1)
+    // Exclude prerelease branches
+    .filter(({type}) => type !== 'prerelease')
+    .map(({channel}) => channel || null);
+
+  const versiontoAdd = uniqBy(
+    branch.tags.filter(
+      ({channels, version}) =>
+        !channels.includes(branch.channel || null) &&
+        intersection(channels, higherChannels).length > 0 &&
+        (branch.type !== 'maintenance' || semver.gte(version, getLowerBound(branch.mergeRange)))
+    ),
+    'version'
+  ).sort((a, b) => semver.compare(b.version, a.version))[0];
+
+  if (versiontoAdd) {
+    const {version, gitTag, channels} = versiontoAdd;
+    const lastRelease = getLastRelease(context, {before: version});
+    if (semver.gt(getLastRelease(context).version, version)) {
+      return;
+    }
+
+    const type = lastRelease.version ? semverDiff(lastRelease.version, version) : 'major';
+    const name = makeTag(tagFormat, version);
+    return {
+      lastRelease,
+      currentRelease: {type, version, channels, gitTag, name, gitHead: gitTag},
+      nextRelease: {
+        type,
+        version,
+        channel: branch.channel || null,
+        gitTag: makeTag(tagFormat, version),
+        name,
+        gitHead: gitTag,
+      },
+    };
+  }
+};