initial version

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitignore

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+/dist
+/node_modules

LICENSE

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+The MIT License (MIT)
+
+Copyright (C) 2024 Michał Męciński
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# Leaner.js
+
+**Leaner.js** is a thin wrapper over the HTML DOM API. Although it contains many features of modern JavaScript frameworks (reactive state, components, etc.), it doesn’t require any special compilers or build tools, and it doesn’t use a virtual DOM so it's very lightweight and efficient.
+
+**Note:** the current version is a proof of concept.

package.json

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+{
+  "name": "leaner",
+  "version": "0.0.1",
+  "description": "Leaner.js",
+  "type": "module",
+  "files": [
+    "dist"
+  ],
+  "exports": {
+    ".": "./dist/core.js",
+    "./web": "./dist/web.js",
+    "./dist/*": "./dist/*",
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "build": "rollup -c"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mimecorg/leaner.git"
+  },
+  "keywords": [
+    "leaner",
+    "javascript",
+    "framework"
+  ],
+  "author": "Michał Męciński",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mimecorg/leaner/issues"
+  },
+  "homepage": "https://github.com/mimecorg/leaner",
+  "devDependencies": {
+    "rollup": "^4.17.2"
+  }
+}

rollup.config.js

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+export default [
+  {
+    input: 'src/core/index.js',
+    output: {
+      file: 'dist/core.js',
+    },
+    onwarn,
+  },
+  {
+    input: 'src/web/index.js',
+    output: {
+      file: 'dist/web.js',
+    },
+    external: [ 'leaner' ],
+    onwarn,
+  },
+];
+
+function onwarn( msg, warn ) {
+  if ( msg.code != 'CIRCULAR_DEPENDENCY' )
+    warn( msg );
+}