Make the Options class more robust

- Includes default values.
- Can be constructed from a partial.

Author: Gigabyte5671

src/Config.ts

@@ -0,0 +1,21 @@
+export type DuplicatesOption = 'preserve' | 'remove';
+export type FillOption = 'fill' | 'no-fill';
+export type ImportsOption = 'include' | 'style-only';
+export type MergeNthOption = 'merge' | 'no-merge';
+export type SanitizationOption = 'all' | 'imports' | 'off';
+
+export class Options {
+	duplicates?: DuplicatesOption = 'remove';
+	fill?: FillOption = 'fill';
+	imports?: ImportsOption = 'style-only';
+	mergeNth?: MergeNthOption = 'merge';
+	sanitize?: SanitizationOption = 'all';
+
+	constructor (options?: Partial<Options>) {
+		if (typeof options?.duplicates === 'string') this.duplicates = options.duplicates;
+		if (typeof options?.fill       === 'string') this.fill = options.fill;
+		if (typeof options?.imports    === 'string') this.imports = options.imports;
+		if (typeof options?.mergeNth   === 'string') this.mergeNth = options.mergeNth;
+		if (typeof options?.sanitize   === 'string') this.sanitize = options.sanitize;
+	}
+}

src/Generator.ts

@@ -1,16 +1,9 @@
 import { createParser } from 'css-selector-parser';
 import type { AstRule, AstSelector } from 'css-selector-parser';
+import { Options } from './Config.js';
 import { Descriptor } from './Descriptor.js';
 import { createCSSOM, elementsAreComparable, mergeElements, sanitizeElement } from './Utility.js';
 
-export class Options {
-	duplicates?: 'preserve' | 'remove';
-	fill?: 'fill' | 'no-fill';
-	imports?: 'include' | 'style-only';
-	mergeNth?: 'merge' | 'no-merge';
-	sanitize?: 'all' | 'imports' | 'off';
-}
-
 const parse = createParser({ syntax: 'progressive' });
 
 class Rule {
@@ -31,7 +24,8 @@ class Rule {
  * @param options `(Optional)` Options with which to configure the generator.
  * @returns An HTML body element containing the generated DOM.
  */
-export async function cssToHtml (css: CSSRuleList | string, options: Options = {}): Promise<HTMLBodyElement> {
+export async function cssToHtml (css: CSSRuleList | string, options: Partial<Options> = {}): Promise<HTMLBodyElement> {
+	options = new Options(options);
 	const output = document.createElement('body');
 
 	const fillerElements = new Array<HTMLElement>();

src/index.ts

@@ -1 +1,2 @@
-export { cssToHtml, Options } from './Generator.js';
+export { Options } from './Config';
+export { cssToHtml } from './Generator.js';