Initial commit

.editorconfig

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+[*.md]
+indent_style = space
+indent_size = 4

.eleventy.js

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+/* eslint-disable valid-jsdoc */
+const classnames = require( "./src/classnames" );
+
+/**
+ * @param {import("@11ty/eleventy/src/UserConfig")} eleventyConfig
+ */
+module.exports = ( eleventyConfig ) =>
+{
+	eleventyConfig.addShortcode( "classnames", classnames );
+};

.eslintrc.js

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+module.exports = {
+	"env": {
+		"es2021": true,
+		"node": true,
+	},
+	"extends": "eslint:recommended",
+	"rules": {
+		"arrow-parens": ["error", "always"],
+		"brace-style": ["error", "allman"],
+		"camelcase": "warn",
+		"comma-dangle": ["error", "always-multiline"],
+		"indent": ["error", "tab"],
+		"max-len": [0, {
+			"ignoreComments": true,
+			"ignoreTrailingComments": true,
+			"ignoreUrls": true,
+			"ignoreStrings": true,
+			"ignoreTemplateLiterals": true,
+			"ignoreRegExpLiterals": true,
+			"ignorePattern": true,
+		}],
+		"new-cap": "warn",
+		"no-console": "warn",
+		"no-invalid-this": "error",
+		"no-negated-condition": "warn",
+		"object-curly-spacing": ["error", "always"],
+		"quotes": ["error", "double"],
+		"require-jsdoc": ["error", {
+			"require": {
+				"FunctionDeclaration": true,
+			},
+		}],
+		"semi": ["error", "always"],
+		"sort-requires/sort-requires": 2,
+		"sort-vars": ["error", {
+			"ignoreCase": true,
+		}],
+		"space-in-parens": ["error", "always", {
+			"exceptions": ["empty"],
+		}],
+	},
+	"parserOptions": {
+		"sourceType": "module",
+	},
+	"plugins": [
+		"sort-requires",
+	],
+};

.gitignore

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+node_modules

README.md

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+# eleventy-plugin-classnames
+
+An [Eleventy](https://11ty.dev/) shortcode for joining truthy, non-duplicate argument values into a space-delimited string.
+
+> Inspired by the [classnames](https://www.npmjs.com/package/classnames) package by [JedWatson](https://github.com/JedWatson/classnames)
+
+## Setup
+
+Run the following command at the root of your Eleventy project
+
+```shell
+npm install @aaashur/eleventy-plugin-classnames
+```
+
+then include it in your `.eleventy.js` config file:
+
+```javascript
+const classnames = require("@aaashur/eleventy-plugin-classnames");
+
+module.exports = (eleventyConfig) => {
+    eleventyConfig.addPlugin(classnames);
+};
+```
+
+## Usage
+
+```njk
+{%- set color = "turquoise" -%}
+{%- set primary = false -%}
+{%- set sectionTitle = "Section Title" -%}
+
+<h2 class="{% classnames
+    "block__element",
+    "block__element--primary" if primary,
+    "block__element--" + color if color
+%}">
+    {{ sectionTitle }}
+</h2>
+```
+
+would return
+
+```html
+<h2 class="block__element block__element--turquoise">
+    Section Title
+</h2>
+```