Drop support for Node < v14 and add support for Node v16 and v18

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - name: install dependencies
       run: yarn install --frozen-lockfile --ignore-engines
     - name: lint
@@ -34,19 +34,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu', 'windows', 'macOS']
-        node: ['6', '8', '10', '12', '14']
-        exclude:
-          # excludes node 14 on macOS, this is because
-          # ember-cli (until ~ 3.12) calls
-          # `fs.writeFileSync('./tmp/.metadata_never_index)` on macOS platforms
-          # to instruct spotlight to avoid indexing the local tmp folder
-          # unfortunately, ember-cli does not pass a value for second arg (the
-          # content to write) and Node 14 added an assertion
-          #
-          # TODO: delete this when we have dropped Node 6 and can update
-          # ember-cli to a version that doesn't do this
-          - os: 'macOS'
-            node: '14'
+        node: ['14', '16', '18']
 
     steps:
     - uses: actions/checkout@v1
@@ -65,19 +53,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu', 'windows']
-        node: ['12', '14']
-        exclude:
-          # excludes node 14 on macOS, this is because
-          # ember-cli (until ~ 3.12) calls
-          # `fs.writeFileSync('./tmp/.metadata_never_index)` on macOS platforms
-          # to instruct spotlight to avoid indexing the local tmp folder
-          # unfortunately, ember-cli does not pass a value for second arg (the
-          # content to write) and Node 14 added an assertion
-          #
-          # TODO: delete this when we have dropped Node 6 and can update
-          # ember-cli to a version that doesn't do this
-          - os: 'macOS'
-            node: '14'
+        node: ['14', '16', '18']
 
     steps:
     - uses: actions/checkout@v1
@@ -97,7 +73,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - name: install dependencies
       run: yarn install --no-lockfile --ignore-engines
     - name: test

package.json

@@ -85,7 +85,7 @@
     "common-tags": "^1.8.0",
     "console-ui": "^2.2.2",
     "core-object": "^3.1.5",
-    "ember-cli": "~3.3.0",
+    "ember-cli": "~3.5.0",
     "ember-cli-dependency-checker": "^3.0.0",
     "eslint": "^4.0.0",
     "ember-cli-htmlbars": "^3.0.0",
@@ -107,7 +107,7 @@
     "resolve": "^1.8.1"
   },
   "engines": {
-    "node": "6.* || 8.* || >= 10.*"
+    "node": "14.* || 16.* || >= 18"
   },
   "resolutions": {
     "**/engine.io": "~3.3.0"