Fix compatibility with ESLint 7 (#1548)

Author: fisker

package.json

@@ -79,7 +79,7 @@
 		"xo": "^0.44.0"
 	},
 	"peerDependencies": {
-		"eslint": ">=8.0.0"
+		"eslint": ">=7.32.0"
 	},
 	"ava": {
 		"files": [

rules/expiring-todo-comments.js

@@ -2,7 +2,9 @@
 const readPkgUp = require('read-pkg-up');
 const semver = require('semver');
 const ci = require('ci-info');
-const baseRule = require('eslint/use-at-your-own-risk').builtinRules.get('no-warning-comments');
+const getBuiltinRule = require('./utils/get-builtin-rule.js');
+
+const baseRule = getBuiltinRule('no-warning-comments');
 
 // `unicorn/` prefix is added to avoid conflicts with core rule
 const MESSAGE_ID_AVOID_MULTIPLE_DATES = 'unicorn/avoidMultipleDates';

rules/utils/get-builtin-rule.js

@@ -0,0 +1,14 @@
+'use strict';
+
+function getBuiltinRule(id) {
+	// TODO: Remove this when we drop support for ESLint 7
+	const eslintVersion = require('eslint/package.json').version;
+	/* istanbul ignore next */
+	if (eslintVersion.startsWith('7.')) {
+		return require(`eslint/lib/rules/${id}`);
+	}
+
+	return require('eslint/use-at-your-own-risk').builtinRules.get(id);
+}
+
+module.exports = getBuiltinRule;