yarn.lock: Share duplicate packages with yarn-deduplicate.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

package.json

@@ -83,7 +83,8 @@
     "svgo": "1.2.2",
     "swagger-parser": "6.0.5",
     "vnu-jar": "^19.6.7",
-    "webpack-dev-server": "3.5.1"
+    "webpack-dev-server": "3.5.1",
+    "yarn-deduplicate": "^1.1.1"
   },
   "scripts": {
     "postinstall": "rm -rf ./var/webpack-cache",

tools/lint

@@ -48,7 +48,7 @@ def run():
 
     by_lang = linter_config.list_files(groups={
         'backend': ['py', 'sh', 'pp', 'json', 'md', 'txt', 'text', 'yaml', 'rst'],
-        'frontend': ['js', 'ts', 'css', 'scss', 'hbs', 'html'],
+        'frontend': ['js', 'ts', 'css', 'scss', 'hbs', 'html', 'lock'],
     }, exclude=EXCLUDED_FILES)
 
     linter_config.external_linter('add_class', ['tools/find-add-class'], ['js'],
@@ -86,6 +86,9 @@ def run():
                                   description="Static type checker for Python (config: mypy.ini)")
     linter_config.external_linter('tsc', ['tools/run-tsc'], ['ts'], pass_targets=False,
                                   description="TypeScript compiler (config: static/js/tsconfig.json)")
+    linter_config.external_linter('yarn-deduplicate', ['tools/run-yarn-deduplicate'], ['lock'],
+                                  pass_targets=False,
+                                  description="Shares duplicate packages in yarn.lock")
     linter_config.external_linter('gitlint', ['tools/commit-message-lint'],
                                   description="Checks commit messages for common formatting errors."
                                   "(config: .gitlint)")

tools/run-yarn-deduplicate

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -eu
+if ! "$(dirname "$0")/../node_modules/.bin/yarn-deduplicate" --fail --list; then
+    echo
+    echo "Duplicates could be shared in yarn.lock. Run:"
+    echo "node_modules/.bin/yarn-deduplicate; yarn"
+    false
+fi

version.py

@@ -26,4 +26,4 @@ LATEST_RELEASE_ANNOUNCEMENT = "https://blog.zulip.org/2019/03/01/zulip-2-0-relea
 #   historical commits sharing the same major version, in which case a
 #   minor version bump suffices.
 
-PROVISION_VERSION = '54.0'
+PROVISION_VERSION = '54.1'