Align everything to Node.js 16 (#22223)

* Update nvmrc to Node.js 16

* Update package.json minimum Node engine to 16

* Update README requirements to Node.js 16

* Update devcontainer Node.js version to 16

* Update devcontainer Dockerfile Node.js choices to LTS versions that are still in support/maintenance

* Pin CircleCI Node image to 16

* Fix YAML type issue

* Update CircleCI Node.js to 16.18 to match #22019

.circleci/config.yml

@@ -221,5 +221,5 @@ workflows:
           pkg-manager: yarn
           requires:
             - build
-          version: lts
+          version: '16.18'
           yarn-run: test:jest

.devcontainer/Dockerfile

@@ -9,7 +9,7 @@ FROM mcr.microsoft.com/vscode/devcontainers/ruby:${VARIANT}
 # The value is a comma-separated list of allowed domains
 ENV RAILS_DEVELOPMENT_HOSTS=".githubpreview.dev"
 
-# [Choice] Node.js version: lts/*, 16, 14, 12, 10
+# [Choice] Node.js version: lts/*, 18, 16, 14
 ARG NODE_VERSION="lts/*"
 RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"
 

.devcontainer/docker-compose.yml

@@ -11,7 +11,7 @@ services:
         # Use -bullseye variants on local arm64/Apple Silicon.
         VARIANT: '3.0-bullseye'
         # Optional Node.js version to install
-        NODE_VERSION: '14'
+        NODE_VERSION: '16'
     volumes:
       - ..:/workspaces/mastodon:cached
     environment:

.nvmrc

@@ -1 +1 @@
-14
+16

README.md

@@ -73,7 +73,7 @@ Mastodon acts as an OAuth2 provider, so 3rd party apps can use the REST and Stre
 - **PostgreSQL** 9.5+
 - **Redis** 4+
 - **Ruby** 2.7+
-- **Node.js** 14+
+- **Node.js** 16+
 
 The repository includes deployment configurations for **Docker and docker-compose** as well as specific platforms like **Heroku**, **Scalingo**, and **Nanobox**. The [**standalone** installation guide](https://docs.joinmastodon.org/admin/install/) is available in the documentation.
 

package.json

@@ -2,7 +2,7 @@
   "name": "@mastodon/mastodon",
   "license": "AGPL-3.0-or-later",
   "engines": {
-    "node": ">=14"
+    "node": ">=16"
   },
   "scripts": {
     "postversion": "git push --tags",