chore(infra): test Node.js v16 and expand "engines" range to include it

.circleci/config.yml

@@ -21,7 +21,8 @@ commands:
   common_test_steps:
     description: "Commands run on each Node.js job (not for Rust jobs)"
     steps:
-      - oss/install_specific_npm_version
+      - oss/install_specific_npm_version:
+          version: '7'
       - checkout
       - oss/npm_clean_install_with_caching
       - run:
@@ -54,7 +55,8 @@ jobs:
   # at https://hub.docker.com/r/circleci/node/.
 
   NodeJS 12:
-    executor: { name: oss/node, tag: '12' }
+    docker:
+      - image: cimg/node:12.22.1
     steps:
       - common_test_steps
       # We will save the results of this one particular invocation to use in
@@ -68,15 +70,24 @@ jobs:
             - ./**
 
   NodeJS 14:
-    executor: { name: oss/node, tag: '14' }
+    docker:
+      - image: cimg/node:14.16.1
+    steps:
+      - common_test_steps
+
+  NodeJS 16:
+    docker:
+      - image: cimg/node:16.0.0
     steps:
       - common_test_steps
 
   GraphQL Types:
     description: "Assert generated GraphQL types are up to date"
-    executor: { name: oss/node, tag: '14' }
+    docker:
+      - image: cimg/node:14.16.1
     steps:
-      - oss/install_specific_npm_version
+      - oss/install_specific_npm_version:
+          version: '7'
       - checkout
       - oss/npm_clean_install_with_caching
       - run:
@@ -87,8 +98,11 @@ jobs:
         type: executor
     executor: << parameters.platform >>
     environment:
+      # Note: This is a no-op at the second, but bear with me on this.  If this
+      # comment is not removed by 2021-06-30 remove it along with the next line.
+      # renovate: datasource=github-tags depName=nodejs/node versioning=node
       NODE_VERSION: 14.16.1
-      NPM_VERSION: 6.14.13
+      NPM_VERSION: 7.10.0
     steps:
       - checkout
       - when:
@@ -264,6 +278,9 @@ workflows:
       - NodeJS 14:
           name: "JS: Node 14"
           <<: *common_non_publish_filters
+      - NodeJS 16:
+          name: "JS: Node 16"
+          <<: *common_non_publish_filters
       - GraphQL Types:
           name: "GraphQL Types (up to date)"
           <<: *common_non_publish_filters
@@ -281,13 +298,15 @@ workflows:
           requires:
             - "JS: Node 12"
             - "JS: Node 14"
+            - "JS: Node 16"
             - "GraphQL Types (up to date)"
       - oss/dry_run:
           name: "JS: Dry-run"
           <<: *common_publish_filters
           requires:
             - "JS: Node 12"
             - "JS: Node 14"
+            - "JS: Node 16"
             - Rust
             - "GraphQL Types (up to date)"
       - oss/confirmation:

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

docs/.npmrc

@@ -0,0 +1 @@
+engine-strict=true