Readme + types (#2)

Author: bartveneman

README.md

@@ -1,5 +1,68 @@
-# CSS Layers
+# css-layer-tree
 
-Discover the composition of your CSS `@layer`s
+Lay out the composition of your CSS `@layer` architecture. See which layers are used, where they are defined and how they are nested.
 
-WORK IN PROGRESS | CHECK BACK SOON
+## Installation
+
+```
+npm install @projectwallace/css-layer-tree
+```
+
+## Usage
+
+```js
+import { get_tree } from '@projectwallace/css-layer-tree'
+
+let css = `
+@import url("test.css") layer;
+@import url("test.css") LAYER(test);
+@layer anotherTest {
+	@layer moreTest {
+		@layer deepTest {}
+	}
+};
+/* anonymous @layer */
+@layer {}
+`
+
+let tree = get_tree(css)
+```
+
+This example would result in this `tree`:
+
+```js
+;[
+	{
+		name: '__anonymous-1__',
+		locations: [{ line: 2, column: 3, start: 3, end: 33 }],
+		children: [],
+	},
+	{
+		name: 'test',
+		locations: [{ line: 3, column: 3, start: 36, end: 72 }],
+		children: [],
+	},
+	{
+		name: 'anotherTest',
+		locations: [{ line: 4, column: 3, start: 75, end: 148 }],
+		children: [
+			{
+				name: 'moreTest',
+				locations: [{ line: 5, column: 4, start: 99, end: 144 }],
+				children: [
+					{
+						name: 'deepTest',
+						locations: [{ line: 6, column: 5, start: 121, end: 139 }],
+						children: [],
+					},
+				],
+			},
+		],
+	},
+]
+```
+
+## Related projects
+
+- [Online CSS Layers visualizer](https://www.projectwallace.com/css-layers-visualizer) - See this library in action online!
+- [CSS Analyzer](https://github.com/projectwallace/css-analyzer) - The best CSS analyzer that powers all analysis on [projectwallace.com](https://www.projectwallace.com)

index.d.ts

@@ -0,0 +1,17 @@
+import { type CssNode } from "css-tree";
+
+export type Location = {
+	line: number;
+	column: number;
+	start: number;
+	end: number;
+}
+
+export type TreeNode = {
+	name: string;
+	children: TreeNode[];
+	locations: Location[];
+}
+
+export function get_tree_from_ast(ast: CssNode): TreeNode['children'];
+export function get_tree(css: string): TreeNode['children'];