refactor: add default options for fenced-code-language and no-html (#427)

Author: lumirlumir

docs/rules/fenced-code-language.md

@@ -34,7 +34,7 @@ console.log(message);
 
 The following options are available on this rule:
 
-* `required: Array<string>` - when specified, fenced code blocks must use one of the languages specified in this array. 
+* `required: Array<string>` - when specified, fenced code blocks must use one of the languages specified in this array. (default: `[]`)
 
 Examples of **incorrect** code when configured as `"fenced-code-language": ["error", { required: ["js"] }]`:
 

docs/rules/no-html.md

@@ -24,7 +24,7 @@ Hello <b>world!</b>
 
 The following options are available on this rule:
 
-* `allowed: Array<string>` - when specified, HTML tags are allowed only if they match one of the tags in this array.
+* `allowed: Array<string>` - when specified, HTML tags are allowed only if they match one of the tags in this array. (default: `[]`)
 
 Examples of **incorrect** code when configured as `"no-html": ["error", { allowed: ["b"] }]`:
 

src/rules/fenced-code-language.js

@@ -54,6 +54,12 @@ export default {
 				additionalProperties: false,
 			},
 		],
+
+		defaultOptions: [
+			{
+				required: [],
+			},
+		],
 	},
 
 	create(context) {

src/rules/no-html.js

@@ -57,6 +57,12 @@ export default {
 				additionalProperties: false,
 			},
 		],
+
+		defaultOptions: [
+			{
+				allowed: [],
+			},
+		],
 	},
 
 	create(context) {