diff --git a/.github/bin/install-and-test-all-packages.sh b/.github/bin/install-and-test-all-packages.sh
index 0513d5f70..168815aca 100644
--- a/.github/bin/install-and-test-all-packages.sh
+++ b/.github/bin/install-and-test-all-packages.sh
@@ -4,27 +4,27 @@ set -e
 
 start_dir=$(pwd)
 
-for package in $(ls -d ./packages); do
+for package in $(ls -d ./packages/*); do
 	echo "Installing and testing $package"
 	cd $package
 	npm install --ignore-scripts
-	npm test
+	npm run test
 	cd $start_dir
 done
 
 
-for package in $(ls -d ./plugins); do
+for package in $(ls -d ./plugins/*); do
 	echo "Installing and testing $package"
 	cd $package
 	npm install --ignore-scripts
-	npm test
+	npm run test
 	cd $start_dir
 done
 
-for package in $(ls -d ./plugin-packs); do
+for package in $(ls -d ./plugin-packs/*); do
 	echo "Installing and testing $package"
 	cd $package
 	npm install --ignore-scripts
-	npm test
+	npm run test
 	cd $start_dir
 done
diff --git a/.github/workflows/test-node-without-workspaces.yml b/.github/workflows/test-node-without-workspaces.yml
new file mode 100644
index 000000000..5c3c01c02
--- /dev/null
+++ b/.github/workflows/test-node-without-workspaces.yml
@@ -0,0 +1,22 @@
+name: test node without workspaces
+on:
+  push:
+
+jobs:
+  test_without_workspaces_support:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [12, 14]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+      - run: npm install --ignore-scripts
+      - run: npm run build --workspaces --if-present
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+      - run: bash ./.github/bin/install-and-test-all-packages.sh
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 585539abf..a313184c2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,40 +14,36 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
 
-      - run: exit 0
-      # - run: npm install --ignore-scripts
-      # - run: npm run build --workspaces --if-present
-      # - run: npm run lint --workspaces --if-present
-      # - run: npm run test --workspaces --if-present
+      - run: npm install --ignore-scripts
+      - run: npm run build --workspaces --if-present
+      - run: npm run lint --workspaces --if-present
+      - run: npm run test --workspaces --if-present
 
-  test_without_workspaces_support:
-    runs-on: ubuntu-latest
+  # Run cross platform test of the basic CLI.
+  test_cli:
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node: [12, 14]
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
           node-version: 16
 
-      - run: exit 0
-      # - run: npm install --ignore-scripts
-      # - run: npm run build --workspaces --if-present
+      - run: npm install --ignore-scripts
+      - run: npm run build --workspaces --if-present
 
-      - uses: actions/setup-node@v2
-        with:
-          node-version: ${{ matrix.node }}
+        # running "npm install" places the cli in node_modules/bin
+      - run: npm install --ignore-scripts
 
-      - run: exit 0
-      # - run: bash ./.github/bin/install-and-test-all-packages.sh
+      - run: |
+            npm run test --workspace="@csstools/base-cli"
+            npm run test:cli --workspace="@csstools/postcss-base-plugin"
 
-  # Run cross platform test of the basic CLI.
-  test_cli:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+  # Run Deno tests one by one
+  test_deno:
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
@@ -55,11 +51,13 @@ jobs:
           node-version: 16
 
       - run: npm install --ignore-scripts
-      # - run: npm run build --workspaces --if-present
+      - run: npm run build --workspaces --if-present
+
+      - uses: denoland/setup-deno@v1
+        with:
+          deno-version: v1.x.x
 
+      # Per plugin from here
       - run: |
-            npm run build --workspace="@csstools/base-cli" --workspace="@csstools/postcss-base-plugin"
-            # running install places the cli in node_modules/bin
-            npm install
-            npm run test --workspace="@csstools/base-cli"
-            npm run test:cli --workspace="@csstools/postcss-base-plugin"
+            cd plugins/postcss-nesting
+            npm run test:deno
diff --git a/plugin-packs/postcss-preset-env/.tape.js b/plugin-packs/postcss-preset-env/.tape.js
index 40df4f4b8..145bd340e 100644
--- a/plugin-packs/postcss-preset-env/.tape.js
+++ b/plugin-packs/postcss-preset-env/.tape.js
@@ -83,7 +83,7 @@ module.exports = {
 			},
 			insertBefore: {
 				'color-mod-function': [
-					require('postcss-simple-vars')
+					require('postcss-simple-vars')()
 				]
 			}
 		}
@@ -93,7 +93,7 @@ module.exports = {
 		options: {
 			stage: 1,
 			insertAfter: {
-				'color-mod-function': require('postcss-simple-vars')
+				'color-mod-function': require('postcss-simple-vars')()
 			}
 		},
 	},
@@ -113,7 +113,7 @@ module.exports = {
 			stage: 1,
 			insertAfter: {
 				'color-mod-function': [
-					require('postcss-simple-vars')
+					require('postcss-simple-vars')()
 				]
 			},
 			features: {
diff --git a/plugin-packs/postcss-preset-env/package.json b/plugin-packs/postcss-preset-env/package.json
index fbca8ced0..cb85df663 100644
--- a/plugin-packs/postcss-preset-env/package.json
+++ b/plugin-packs/postcss-preset-env/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -65,7 +65,8 @@
   },
   "devDependencies": {
     "postcss": "^8.3.6",
-    "postcss-tape": "^6.0.1"
+    "postcss-tape": "^6.0.1",
+    "postcss-simple-vars": "^6.0.3"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugin-packs/postcss-preset-env/test/basic.autoprefixer.expect.css b/plugin-packs/postcss-preset-env/test/basic.autoprefixer.expect.css
index 7b3eaf1a2..ae592c00b 100644
--- a/plugin-packs/postcss-preset-env/test/basic.autoprefixer.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.autoprefixer.expect.css
@@ -9,18 +9,22 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+@media (-webkit-min-device-pixel-ratio: 1), (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 [dir="ltr"] .test-logical-properties-and-values {
@@ -97,8 +101,8 @@
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.autoprefixer.false.expect.css b/plugin-packs/postcss-preset-env/test/basic.autoprefixer.false.expect.css
index 7b3eaf1a2..ae592c00b 100644
--- a/plugin-packs/postcss-preset-env/test/basic.autoprefixer.false.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.autoprefixer.false.expect.css
@@ -9,18 +9,22 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+@media (-webkit-min-device-pixel-ratio: 1), (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 [dir="ltr"] .test-logical-properties-and-values {
@@ -97,8 +101,8 @@
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.ch38.expect.css b/plugin-packs/postcss-preset-env/test/basic.ch38.expect.css
index 286e8618d..a2e037294 100644
--- a/plugin-packs/postcss-preset-env/test/basic.ch38.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.ch38.expect.css
@@ -9,19 +9,23 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (min-resolution: 192dpi) {
+@media (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 [dir="ltr"] .test-logical-properties-and-values {
@@ -98,8 +102,8 @@
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.expect.css b/plugin-packs/postcss-preset-env/test/basic.expect.css
index f66a86bd7..d8e8d8916 100644
--- a/plugin-packs/postcss-preset-env/test/basic.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.expect.css
@@ -9,19 +9,23 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+@media (-webkit-min-device-pixel-ratio: 1), (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 [dir="ltr"] .test-logical-properties-and-values {
@@ -98,8 +102,8 @@
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.ff49.expect.css b/plugin-packs/postcss-preset-env/test/basic.ff49.expect.css
index 416b52c3a..c98fbf83f 100644
--- a/plugin-packs/postcss-preset-env/test/basic.ff49.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.ff49.expect.css
@@ -8,18 +8,22 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (min-resolution: 192dpi) {
+@media (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 .test-logical-properties-and-values {
@@ -88,8 +92,8 @@
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.stage0-ff49.expect.css b/plugin-packs/postcss-preset-env/test/basic.stage0-ff49.expect.css
index 79fe510c9..fb13c1998 100644
--- a/plugin-packs/postcss-preset-env/test/basic.stage0-ff49.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.stage0-ff49.expect.css
@@ -8,18 +8,22 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (min-resolution: 192dpi) {
+@media (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 .test-logical-properties-and-values {
@@ -92,8 +96,8 @@ h1.test-custom-selectors,h2.test-custom-selectors,h3.test-custom-selectors,h4.te
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugin-packs/postcss-preset-env/test/basic.stage0.expect.css b/plugin-packs/postcss-preset-env/test/basic.stage0.expect.css
index b5262b8aa..af1344c4e 100644
--- a/plugin-packs/postcss-preset-env/test/basic.stage0.expect.css
+++ b/plugin-packs/postcss-preset-env/test/basic.stage0.expect.css
@@ -9,19 +9,23 @@
 
 .test-image-set-function {
 	background-image: url(img/test.png);
+	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
+	order: 2;
 }
 
-@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+@media (-webkit-min-device-pixel-ratio: 1), (min-resolution: 96dpi) {
 
 .test-image-set-function {
-	background-image:  url(img/test-2x.png);
+	background-image: url(img/test.png);
 }
 }
 
+@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+
 .test-image-set-function {
-	background-image: -webkit-image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	background-image: image-set(url(img/test.png) 1x, url(img/test-2x.png) 2x);
-	order: 2;
+	background-image: url(img/test-2x.png);
+}
 }
 
 [dir="ltr"] .test-logical-properties-and-values {
@@ -102,8 +106,8 @@ h1.test-custom-selectors,h2.test-custom-selectors,h3.test-custom-selectors,h4.te
 }
 
 .test-lab-function {
-	background-color: rgb(178, 34, 34);
-	color: rgba(178, 34, 34, 0.5);
+	background-color: rgb(179, 35, 35);
+	color: rgba(179, 34, 35, 0.5);
 	order: 14;
 }
 
diff --git a/plugins/css-blank-pseudo/package.json b/plugins/css-blank-pseudo/package.json
index 7746f3940..cace0b936 100644
--- a/plugins/css-blank-pseudo/package.json
+++ b/plugins/css-blank-pseudo/package.json
@@ -9,6 +9,11 @@
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
   "exports": {
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs",
+      "default": "./dist/index.mjs"
+    },
     "./browser": {
       "default": "./dist/browser.js"
     },
@@ -29,7 +34,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default-with-browser.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -37,11 +42,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/css-has-pseudo/package.json b/plugins/css-has-pseudo/package.json
index 871d927de..9bd97c7f6 100644
--- a/plugins/css-has-pseudo/package.json
+++ b/plugins/css-has-pseudo/package.json
@@ -9,6 +9,11 @@
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
   "exports": {
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs",
+      "default": "./dist/index.mjs"
+    },
     "./browser": {
       "default": "./dist/browser.js"
     },
@@ -29,7 +34,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default-with-browser.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -37,11 +42,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/css-prefers-color-scheme/package.json b/plugins/css-prefers-color-scheme/package.json
index 5d6a7d878..f249ac6f8 100644
--- a/plugins/css-prefers-color-scheme/package.json
+++ b/plugins/css-prefers-color-scheme/package.json
@@ -9,6 +9,11 @@
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
   "exports": {
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs",
+      "default": "./dist/index.mjs"
+    },
     "./browser": {
       "default": "./dist/browser.js"
     },
@@ -29,7 +34,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default-with-browser.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -37,8 +42,8 @@
     "node": "^12 || ^14 || >=16"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-base-plugin/package.json b/plugins/postcss-base-plugin/package.json
index c5b8f10f8..ebc97f273 100644
--- a/plugins/postcss-base-plugin/package.json
+++ b/plugins/postcss-base-plugin/package.json
@@ -24,13 +24,12 @@
   "scripts": {
     "prepublishOnly": "npm run build --if-present && npm run test --if-present",
     "lint": "eslint src/**/*.ts",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "test:cli": "bash ./test/cli/test.sh",
     "build": "rollup -c ../../rollup/default.ts.js",
     "stryker": "stryker run --logLevel error"
   },
   "devDependencies": {
-    "@csstools/base-cli": "^0.1.0",
     "postcss": "^8.3.6",
     "postcss-tape": "^6.0.1"
   },
diff --git a/plugins/postcss-base-plugin/src/index.ts b/plugins/postcss-base-plugin/src/index.ts
index 1068ac962..ee1f96bc0 100644
--- a/plugins/postcss-base-plugin/src/index.ts
+++ b/plugins/postcss-base-plugin/src/index.ts
@@ -5,7 +5,7 @@ const creator: PluginCreator<{ color: string }> = (opts?: { color: string }) =>
 		postcssPlugin: 'postcss-base-plugin',
 		Declaration(decl) {
 			if (decl.value === 'red') {
-				if (opts?.color) {
+				if (opts && opts.color) {
 					decl.value = opts.color;
 				} else {
 					decl.value = 'blue';
diff --git a/plugins/postcss-color-functional-notation/package.json b/plugins/postcss-color-functional-notation/package.json
index 92a455113..0a35e3f8d 100644
--- a/plugins/postcss-color-functional-notation/package.json
+++ b/plugins/postcss-color-functional-notation/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
diff --git a/plugins/postcss-dir-pseudo-class/package.json b/plugins/postcss-dir-pseudo-class/package.json
index d65a523ae..d927f8b4b 100644
--- a/plugins/postcss-dir-pseudo-class/package.json
+++ b/plugins/postcss-dir-pseudo-class/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,11 +29,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-double-position-gradients/package.json b/plugins/postcss-double-position-gradients/package.json
index 0c259827f..b08676fb0 100644
--- a/plugins/postcss-double-position-gradients/package.json
+++ b/plugins/postcss-double-position-gradients/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -32,8 +32,8 @@
     "postcss-values-parser": "^6.0.1"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-env-function/package.json b/plugins/postcss-env-function/package.json
index c3207a703..2b1b074f4 100644
--- a/plugins/postcss-env-function/package.json
+++ b/plugins/postcss-env-function/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,11 +29,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-values-parser": "6.0.1"
+    "postcss-values-parser": "^6.0.1"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-focus-visible/package.json b/plugins/postcss-focus-visible/package.json
index 3effe76e3..e86233d0a 100644
--- a/plugins/postcss-focus-visible/package.json
+++ b/plugins/postcss-focus-visible/package.json
@@ -22,7 +22,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.ts",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.ts.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -30,11 +30,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-focus-visible/src/index.ts b/plugins/postcss-focus-visible/src/index.ts
index 43b196a21..8f18496c3 100644
--- a/plugins/postcss-focus-visible/src/index.ts
+++ b/plugins/postcss-focus-visible/src/index.ts
@@ -2,7 +2,7 @@
 import parser from 'postcss-selector-parser';
 import type { PluginCreator } from 'postcss';
 
-export const selectorRegExp = /(?<!\\):focus-visible([^\w-]|$)/gi;
+const selectorRegExp = /(?<!\\):focus-visible([^\w-]|$)/gi;
 
 const creator: PluginCreator<{ preserve?: boolean, replaceWith?: string }> = (opts?: { preserve?: boolean, replaceWith?: string }) => {
 	opts = Object(opts);
diff --git a/plugins/postcss-focus-within/package.json b/plugins/postcss-focus-within/package.json
index 77e1f6016..43c922404 100644
--- a/plugins/postcss-focus-within/package.json
+++ b/plugins/postcss-focus-within/package.json
@@ -22,7 +22,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.ts",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.ts.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -30,11 +30,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-gap-properties/package.json b/plugins/postcss-gap-properties/package.json
index 3848657ce..75b89cbae 100644
--- a/plugins/postcss-gap-properties/package.json
+++ b/plugins/postcss-gap-properties/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,8 +29,8 @@
     "node": "^12 || ^14 || >=16"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-image-set-function/package.json b/plugins/postcss-image-set-function/package.json
index c18e19e57..a55ccae1e 100644
--- a/plugins/postcss-image-set-function/package.json
+++ b/plugins/postcss-image-set-function/package.json
@@ -21,8 +21,8 @@
   },
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
-    "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "lint": "eslint src/**/*.ts",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.ts.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -30,11 +30,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-values-parser": "6.0.1"
+    "postcss-values-parser": "^6.0.1"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-lab-function/package.json b/plugins/postcss-lab-function/package.json
index c146026a0..0a847926b 100644
--- a/plugins/postcss-lab-function/package.json
+++ b/plugins/postcss-lab-function/package.json
@@ -22,7 +22,7 @@
   "scripts": {
     "prepublishOnly": "npm run build --if-present && npm run test --if-present",
     "lint": "eslint src/**/*.ts",
-    "test": "node ./test/color/test.mjs && postcss-tape",
+    "test": "node ./test/color/test.mjs && postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.ts.js",
     "stryker": "stryker run --logLevel error",
     "generate-color-corpus": "python3 ./test/color/generate.py"
@@ -34,7 +34,6 @@
     "postcss-values-parser": "^6.0.1"
   },
   "devDependencies": {
-    "@csstools/base-cli": "^0.1.0",
     "postcss": "^8.3.6",
     "postcss-tape": "^6.0.1"
   },
diff --git a/plugins/postcss-lab-function/src/index.ts b/plugins/postcss-lab-function/src/index.ts
index f3df7eb3f..c0aa16f5c 100644
--- a/plugins/postcss-lab-function/src/index.ts
+++ b/plugins/postcss-lab-function/src/index.ts
@@ -6,7 +6,7 @@ import onCSSFunction from './on-css-function';
 import type { PluginCreator } from 'postcss';
 
 // NOTE : Used in unit tests.
-export { labToSRgb, lchToSRgb } from './color';
+import { labToSRgb, lchToSRgb } from './color';
 
 /** Transform lab() and lch() functions in CSS. */
 const postcssPlugin: PluginCreator<{ preserve: boolean }> = (opts?: { preserve: boolean }) => {
@@ -86,4 +86,10 @@ const postcssPlugin: PluginCreator<{ preserve: boolean }> = (opts?: { preserve:
 
 postcssPlugin.postcss = true;
 
+// Used by unit tests.
+// Mixing named and default export causes issues with CJS.
+// Attaching these to the default export is the best solution.
+postcssPlugin['_labToSRgb'] = labToSRgb;
+postcssPlugin['_lchToSRgb'] = lchToSRgb;
+
 export default postcssPlugin;
diff --git a/plugins/postcss-lab-function/test/color/test.mjs b/plugins/postcss-lab-function/test/color/test.mjs
index 63eb2f8a9..f1b023b88 100644
--- a/plugins/postcss-lab-function/test/color/test.mjs
+++ b/plugins/postcss-lab-function/test/color/test.mjs
@@ -3,7 +3,9 @@
 // ColorAid is a python package that follows the CSS specification.
 // Comparing our output to the python package gives a relatively good idea of how good we convert.
 import fs from 'fs';
-import { labToSRgb, lchToSRgb } from '../../dist/index.mjs';
+import plugin from '../../dist/index.mjs';
+const labToSRgb = plugin._labToSRgb;
+const lchToSRgb = plugin._lchToSRgb;
 
 // LAB to SRGB
 {
diff --git a/plugins/postcss-logical/package.json b/plugins/postcss-logical/package.json
index c398cf1c3..14be88440 100644
--- a/plugins/postcss-logical/package.json
+++ b/plugins/postcss-logical/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,8 +29,8 @@
     "node": "^12 || ^14 || >=16"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-nesting/package.json b/plugins/postcss-nesting/package.json
index 67fb80af4..0f4ed46b1 100644
--- a/plugins/postcss-nesting/package.json
+++ b/plugins/postcss-nesting/package.json
@@ -30,7 +30,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape && npm run test:deno",
+    "test": "postcss-tape --ci",
     "test:deno": "deno run --unstable --allow-env --allow-read test/deno/test.js",
     "build": "rollup -c ../../rollup/default-with-deno.js",
     "stryker": "stryker run --logLevel error"
@@ -39,11 +39,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-selector-parser": "6.0.6"
+    "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-overflow-shorthand/package.json b/plugins/postcss-overflow-shorthand/package.json
index a9ad23a5d..37f5f7e90 100644
--- a/plugins/postcss-overflow-shorthand/package.json
+++ b/plugins/postcss-overflow-shorthand/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,8 +29,8 @@
     "node": "^12 || ^14 || >=16"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-place/package.json b/plugins/postcss-place/package.json
index eede19f40..dfdefcce7 100755
--- a/plugins/postcss-place/package.json
+++ b/plugins/postcss-place/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -29,11 +29,11 @@
     "node": "^12 || ^14 || >=16"
   },
   "dependencies": {
-    "postcss-values-parser": "6.0.1"
+    "postcss-values-parser": "^6.0.1"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/plugins/postcss-pseudo-class-any-link/package.json b/plugins/postcss-pseudo-class-any-link/package.json
index 51170863b..89edd5e1d 100644
--- a/plugins/postcss-pseudo-class-any-link/package.json
+++ b/plugins/postcss-pseudo-class-any-link/package.json
@@ -21,7 +21,7 @@
   "scripts": {
     "prepublishOnly": "npm run build && npm run test",
     "lint": "eslint src/**/*.js",
-    "test": "postcss-tape",
+    "test": "postcss-tape --ci",
     "build": "rollup -c ../../rollup/default.js",
     "stryker": "stryker run --logLevel error"
   },
@@ -32,8 +32,8 @@
     "postcss-selector-parser": "^6.0.6"
   },
   "devDependencies": {
-    "postcss": "8.3.6",
-    "postcss-tape": "6.0.1"
+    "postcss": "^8.3.6",
+    "postcss-tape": "^6.0.1"
   },
   "peerDependencies": {
     "postcss": "^8.3"
diff --git a/rollup/default-with-browser.js b/rollup/default-with-browser.js
index 4c983e09c..968f2f4d8 100644
--- a/rollup/default-with-browser.js
+++ b/rollup/default-with-browser.js
@@ -12,8 +12,10 @@ export default [
 			{ file: 'dist/index.mjs', format: 'esm', sourcemap: true, exports: 'auto' },
 		],
 		external: [
-			'postcss-values-parser',
+			'fs',
+			'path',
 			'postcss-selector-parser',
+			'postcss-values-parser',
 		],
 		plugins: [
 			babel({
@@ -37,6 +39,46 @@ export default [
 		output: [
 			{ file: 'dist/browser.cjs', format: 'cjs', sourcemap: true, exports: 'auto', strict: false },
 		],
+		external: [
+			'fs',
+			'path',
+
+			'autoprefixer',
+			'browserslist',
+			'caniuse-lite',
+			'css-blank-pseudo',
+			'css-has-pseudo',
+			'css-prefers-color-scheme',
+			'cssdb',
+			'postcss-attribute-case-insensitive',
+			'postcss-color-functional-notation',
+			'postcss-color-hex-alpha',
+			'postcss-color-rebeccapurple',
+			'postcss-custom-media',
+			'postcss-custom-properties',
+			'postcss-custom-selectors',
+			'postcss-dir-pseudo-class',
+			'postcss-double-position-gradients',
+			'postcss-env-function',
+			'postcss-focus-visible',
+			'postcss-focus-within',
+			'postcss-font-variant',
+			'postcss-gap-properties',
+			'postcss-image-set-function',
+			'postcss-initial',
+			'postcss-lab-function',
+			'postcss-logical',
+			'postcss-media-minmax',
+			'postcss-nesting',
+			'postcss-overflow-shorthand',
+			'postcss-page-break',
+			'postcss-place',
+			'postcss-pseudo-class-any-link',
+			'postcss-replace-overflow-wrap',
+			'postcss-selector-not',
+			'postcss-selector-parser',
+			'postcss-values-parser',
+		],
 		plugins: [
 			babel({
 				babelHelpers: 'bundled',
diff --git a/rollup/default-with-deno.js b/rollup/default-with-deno.js
index c062f5b00..01131802c 100644
--- a/rollup/default-with-deno.js
+++ b/rollup/default-with-deno.js
@@ -37,6 +37,46 @@ export default [
 		output: [
 			{ file: 'dist/cli.mjs', format: 'esm', sourcemap: false },
 		],
+		external: [
+			'fs',
+			'path',
+
+			'autoprefixer',
+			'browserslist',
+			'caniuse-lite',
+			'css-blank-pseudo',
+			'css-has-pseudo',
+			'css-prefers-color-scheme',
+			'cssdb',
+			'postcss-attribute-case-insensitive',
+			'postcss-color-functional-notation',
+			'postcss-color-hex-alpha',
+			'postcss-color-rebeccapurple',
+			'postcss-custom-media',
+			'postcss-custom-properties',
+			'postcss-custom-selectors',
+			'postcss-dir-pseudo-class',
+			'postcss-double-position-gradients',
+			'postcss-env-function',
+			'postcss-focus-visible',
+			'postcss-focus-within',
+			'postcss-font-variant',
+			'postcss-gap-properties',
+			'postcss-image-set-function',
+			'postcss-initial',
+			'postcss-lab-function',
+			'postcss-logical',
+			'postcss-media-minmax',
+			'postcss-nesting',
+			'postcss-overflow-shorthand',
+			'postcss-page-break',
+			'postcss-place',
+			'postcss-pseudo-class-any-link',
+			'postcss-replace-overflow-wrap',
+			'postcss-selector-not',
+			'postcss-selector-parser',
+			'postcss-values-parser',
+		],
 		onwarn: (warning) => {
 			// Silence circular dependency warning for postcss-values-parsers package
 			if (
diff --git a/rollup/default.js b/rollup/default.js
index 38071c1c1..ff97dc6b2 100644
--- a/rollup/default.js
+++ b/rollup/default.js
@@ -12,8 +12,10 @@ export default [
 			{ file: 'dist/index.mjs', format: 'esm', sourcemap: true, exports: 'auto' },
 		],
 		external: [
-			'postcss-values-parser',
+			'fs',
+			'path',
 			'postcss-selector-parser',
+			'postcss-values-parser',
 		],
 		plugins: [
 			babel({
@@ -37,6 +39,46 @@ export default [
 		output: [
 			{ file: 'dist/cli.mjs', format: 'esm', sourcemap: false },
 		],
+		external: [
+			'fs',
+			'path',
+
+			'autoprefixer',
+			'browserslist',
+			'caniuse-lite',
+			'css-blank-pseudo',
+			'css-has-pseudo',
+			'css-prefers-color-scheme',
+			'cssdb',
+			'postcss-attribute-case-insensitive',
+			'postcss-color-functional-notation',
+			'postcss-color-hex-alpha',
+			'postcss-color-rebeccapurple',
+			'postcss-custom-media',
+			'postcss-custom-properties',
+			'postcss-custom-selectors',
+			'postcss-dir-pseudo-class',
+			'postcss-double-position-gradients',
+			'postcss-env-function',
+			'postcss-focus-visible',
+			'postcss-focus-within',
+			'postcss-font-variant',
+			'postcss-gap-properties',
+			'postcss-image-set-function',
+			'postcss-initial',
+			'postcss-lab-function',
+			'postcss-logical',
+			'postcss-media-minmax',
+			'postcss-nesting',
+			'postcss-overflow-shorthand',
+			'postcss-page-break',
+			'postcss-place',
+			'postcss-pseudo-class-any-link',
+			'postcss-replace-overflow-wrap',
+			'postcss-selector-not',
+			'postcss-selector-parser',
+			'postcss-values-parser',
+		],
 		onwarn: (warning) => {
 			// Silence circular dependency warning for postcss-values-parsers package
 			if (
diff --git a/rollup/default.ts.js b/rollup/default.ts.js
index 7d0df0606..2dbd49780 100644
--- a/rollup/default.ts.js
+++ b/rollup/default.ts.js
@@ -13,8 +13,10 @@ export default [
 			{ file: 'dist/index.mjs', format: 'esm', sourcemap: true, exports: 'auto' },
 		],
 		external: [
-			'postcss-values-parser',
+			'fs',
+			'path',
 			'postcss-selector-parser',
+			'postcss-values-parser',
 		],
 		plugins: [
 			typescript({ tsconfig: './tsconfig.json' }),
@@ -39,6 +41,46 @@ export default [
 		output: [
 			{ file: 'dist/cli.mjs', format: 'esm', sourcemap: false },
 		],
+		external: [
+			'fs',
+			'path',
+
+			'autoprefixer',
+			'browserslist',
+			'caniuse-lite',
+			'css-blank-pseudo',
+			'css-has-pseudo',
+			'css-prefers-color-scheme',
+			'cssdb',
+			'postcss-attribute-case-insensitive',
+			'postcss-color-functional-notation',
+			'postcss-color-hex-alpha',
+			'postcss-color-rebeccapurple',
+			'postcss-custom-media',
+			'postcss-custom-properties',
+			'postcss-custom-selectors',
+			'postcss-dir-pseudo-class',
+			'postcss-double-position-gradients',
+			'postcss-env-function',
+			'postcss-focus-visible',
+			'postcss-focus-within',
+			'postcss-font-variant',
+			'postcss-gap-properties',
+			'postcss-image-set-function',
+			'postcss-initial',
+			'postcss-lab-function',
+			'postcss-logical',
+			'postcss-media-minmax',
+			'postcss-nesting',
+			'postcss-overflow-shorthand',
+			'postcss-page-break',
+			'postcss-place',
+			'postcss-pseudo-class-any-link',
+			'postcss-replace-overflow-wrap',
+			'postcss-selector-not',
+			'postcss-selector-parser',
+			'postcss-values-parser',
+		],
 		onwarn: (warning) => {
 			// Silence circular dependency warning for postcss-values-parsers package
 			if (