Merge branch 'master' into next/7

# Conflicts:
#	.nvmrc

Author: shellscape

dist/errors.d.ts

@@ -0,0 +1,6 @@
+export declare class ParseError extends Error {
+    constructor(error: Error);
+}
+export declare class AstError extends Error {
+    constructor();
+}

dist/errors.js

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+import { ParseOptions } from './parser.js';
+import { stringify } from './stringify.js';
+export { registerWalkers } from './walker.js';
+export { ParseOptions } from './parser.js';
+export * from './nodes/index.js';
+interface Builder {
+    (part: string, node?: any, type?: 'start' | 'end'): void;
+}
+export interface Stringifier {
+    (node: any, builder: Builder): void;
+}
+export declare const parse: (css: string, options?: ParseOptions) => import("./nodes/Root.js").Root;
+export declare const nodeToString: (node: any) => string;
+export { stringify };

dist/errors.js.map

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+import { Node, NodeOptions } from './Node.js';
+export declare class Comment extends Node {
+    readonly inline: boolean;
+    readonly text: string;
+    type: string;
+    constructor(options: NodeOptions);
+}

dist/index.d.ts

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+import { Container as PostCssContainer } from 'postcss';
+import { Node, NodeOptions } from './Node.js';
+export declare class Container extends PostCssContainer {
+    readonly value: string;
+    constructor(options?: NodeOptions);
+    add(node: Container | Node): this;
+    toString(stringifier?: import("../stringify.js").Stringifier): string;
+}