initial mono repo context

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{json,md,yml}]
+indent_size = 2
+indent_style = space

.eslintrc.json

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+{
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "rules": {
+    "quotes": ["error", "single"],
+    "comma-dangle": ["error", "always-multiline"],
+    "semi": ["error", "always"]
+  },
+  "overrides": [
+    {
+      "files": [
+        "**/*.ts"
+      ],
+      "extends": [
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended"
+      ],
+      "parser": "@typescript-eslint/parser",
+      "plugins": [
+        "@typescript-eslint"
+      ],
+      "rules": {
+        "no-shadow": "off",
+        "@typescript-eslint/no-shadow": "error"
+      }
+    }
+  ]
+}

.github/bin/install-and-test-all-packages.sh

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+# REMOVE this file after node 20 is released and update the test.yml workflow
+
+set -e
+
+start_dir=$(pwd)
+
+for package in $(ls -d ./packages); do
+	echo "Installing and testing $package"
+	cd $package
+	npm install --ignore-scripts
+	npm test
+	cd $start_dir
+done
+
+
+for package in $(ls -d ./plugins); do
+	echo "Installing and testing $package"
+	cd $package
+	npm install --ignore-scripts
+	npm test
+	cd $start_dir
+done
+
+for package in $(ls -d ./plugin-packs); do
+	echo "Installing and testing $package"
+	cd $package
+	npm install --ignore-scripts
+	npm test
+	cd $start_dir
+done

.github/workflows/test.yml

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+name: test
+on:
+  push:
+
+jobs:
+  test_with_workspaces_support:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # All currently supported LTS versions + latest with workspaces support
+        node: [16, 17]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: npm ci --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
+    strategy:
+      matrix:
+        # All currently supported LTS versions without workspaces support
+        node: [12, 14]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - run: npm ci --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
+
+  # Run cross platform test of the basic CLI.
+  test_cli:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - run: npm ci --ignore-scripts
+      - run: npm run build --workspaces --if-present
+
+      - run: |
+          npm run build --workspace="@csstools/base-cli" --workspace="@csstools/postcss-base-plugin"
+          npm run test --workspace="@csstools/base-cli" --workspace="@csstools/postcss-base-plugin"

.gitignore

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+node_modules
+yarn.lock
+reports
+.stryker-tmp

.prettierignore

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+*

.stylelintignore

@@ -0,0 +1 @@
+*

LICENSE.md

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+# CC0 1.0 Universal
+
+## Statement of Purpose
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README.md

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+# TODO : make a README for this mono repo