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diff --git a/support/xyz.sh b/support/xyz.sh
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+++ b/support/xyz.sh
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+#!/usr/bin/env bash
+
+# Slightly modified version of xyz that publishes from the build directory,
+# rather than the root.
+
+set -e
+
+usage="
+Usage: xyz [options]
+
+Publish a new version of the npm package in the current working directory.
+This involves updating the version number in package.json, committing this
+change (along with any staged changes), tagging the commit, pushing to the
+remote git repository, and finally publishing to the public npm registry.
+
+If present, component.json is updated along with package.json.
+
+Options:
+
+-b --branch <name>
+        Specify the branch from which new versions must be published.
+        xyz aborts if run from any other branch to prevent accidental
+        publication of feature branches. 'master' is assumed if this
+        option is omitted.
+
+-i --increment <level>
+        Specify the level of the current version number to increment.
+        Valid levels: 'major', 'minor', 'patch', 'premajor', 'preminor',
+        'prepatch', and 'prerelease'. 'patch' is assumed if this option
+        is omitted.
+
+-m --message <template>
+        Specify the format of the commit (and tag) message.
+        'X.Y.Z' acts as a placeholder for the version number.
+        'Version X.Y.Z' is assumed if this option is omitted.
+
+-r --repo <repository>
+        Specify the remote repository to which to 'git push'.
+        The value must be either a URL or the name of a remote.
+        The latter is not recommended: it relies on local state.
+        'origin' is assumed if this option is omitted.
+
+-s --script <path>
+        Specify a script to be run after the confirmation prompt.
+        It is passed VERSION and PREVIOUS_VERSION as environment
+        variables. xyz aborts if the script's exit code is not 0.
+
+-t --tag <template>
+        Specify the format of the tag name. As with --message,
+        'X.Y.Z' acts as a placeholder for the version number.
+        'vX.Y.Z' is assumed if this option is omitted.
+
+--dry-run
+        Print the commands without evaluating them.
+
+-v --version
+        Print xyz's version number and exit.
+"
+
+# http://stackoverflow.com/a/246128/312785
+path="${BASH_SOURCE[0]}"
+while [ -h "$path" ] ; do
+  dir="$(cd -P "$(dirname "$path")" && pwd)"
+  path="$(readlink "$path")"
+  [[ $path == /* ]] || path="$dir/$path"
+done
+dir="$(cd -P "$(dirname "$path")" && pwd)"
+
+branch=master
+increment=patch
+message_template='Version X.Y.Z'
+repo=origin
+declare -a scripts
+tag_template=vX.Y.Z
+dry_run=false
+
+while (($# > 0)) ; do
+  option="$1"
+  shift
+
+  case "$option" in
+    -h|--help)
+      echo "$usage"
+      exit
+      ;;
+    -v|--version)
+      node -p "require('$dir/package.json').version"
+      exit
+      ;;
+    -b|--branch)    branch="$1"           ; shift ;;
+    -i|--increment) increment="$1"        ; shift ;;
+    -m|--message)   message_template="$1" ; shift ;;
+    -r|--repo)      repo="$1"             ; shift ;;
+    -s|--script)    scripts+=("$1")       ; shift ;;
+    -t|--tag)       tag_template="$1"     ; shift ;;
+    --dry-run)      dry_run=true          ;;
+    *)
+      echo "Unrecognized option $option" >&2
+      exit 1
+  esac
+done
+
+case "$increment" in
+  major|minor|patch|premajor|preminor|prepatch|prerelease) ;;
+  *) echo "Invalid --increment" >&2 ; exit 1 ;;
+esac
+
+[[ $(git rev-parse --abbrev-ref HEAD) == $branch ]] ||
+  (echo "Current branch does not match specified --branch" >&2 ; exit 1)
+
+git diff-files --quiet ||
+  (echo "Working directory contains unstaged changes" >&2 ; exit 1)
+
+name=$(node -p "require('./package.json').name" 2>/dev/null) ||
+  (echo "Cannot read package name" >&2 ; exit 1)
+
+version=$(node -p "require('./package.json').version" 2>/dev/null) ||
+  (echo "Cannot read package version" >&2 ; exit 1)
+
+next_version=$("$dir/node_modules/.bin/semver" -i "$increment" "$version") ||
+  (echo "Cannot increment version number" >&2 ; exit 1)
+
+message="${message_template//X.Y.Z/$next_version}"
+tag="${tag_template//X.Y.Z/$next_version}"
+
+bold=$(tput bold)
+reset=$(tput sgr0)
+printf "Current version is ${bold}${version}${reset}. "
+printf "Press [enter] to publish ${bold}${name}@${next_version}${reset}."
+read -s # suppress user input
+echo    # output \n since [enter] output was suppressed
+
+run() {
+  echo "$1"
+  if [[ $dry_run == false ]] ; then
+    eval "$1"
+  fi
+}
+
+# Prune before running tests to catch dependencies that have been
+# installed but not specified in the project's `package.json` file.
+
+run "npm prune"
+run "npm test"
+
+for script in "${scripts[@]}" ; do
+  [[ $script == /* ]] || script="$(pwd)/$script"
+  run "VERSION=$next_version PREVIOUS_VERSION=$version '$script'"
+done
+
+inc() {
+  if [[ -f "$1" ]] ; then
+    run "node -e '$(echo "
+      var o = require('./$1'); o.version = '$next_version';
+      require('fs').writeFileSync('./$1', JSON.stringify(o, null, 2) + '\n');
+    " | tr "'" '"' | tr -d "\n" | tr -s " " | sed -e "s/^ *//" -e "s/ *$//")'"
+    run "git add '$1'"
+  fi
+}
+
+inc package.json
+
+run "./sync-package-managers.js"
+run "git add --force *.json"
+
+run "git commit --message '$message'"
+run "git tag --annotate '$tag' --message '$message'"
+run "git push '$repo' 'refs/heads/$branch' 'refs/tags/$tag'"
+
+#cd build/
+#run "npm pack"