feat: support ESLint 8.x

BREAKING CHANGE: Requires Node@^12.22.0 || ^14.17.0 || >=16.0.0

Author: MichaelDeBoey

.circleci/config.yml

@@ -7,7 +7,7 @@ version: 2
 defaults: &defaults
   working_directory: ~/repo
   docker:
-    - image: circleci/node:10
+    - image: circleci/node:12
 
 jobs:
   test:

.eslintrc

@@ -20,7 +20,9 @@
       "rules": {
         "camelcase": "off",
         "no-plusplus": "off",
-        "import/extensions": "off"
+        "import/extensions": "off",
+        "no-shadow": "off",
+        "@typescript-eslint/no-shadow": "error"
       }
     }
   ],

package.json

@@ -30,26 +30,26 @@
     "eslint": ">=0.8.0"
   },
   "devDependencies": {
-    "@types/eslint": "^7.2.0",
-    "@types/jest": "^26.0.0",
-    "@types/node": "^14.0.13",
-    "@typescript-eslint/eslint-plugin": "^3.4.0",
-    "@typescript-eslint/parser": "^3.4.0",
-    "eslint": "^7.3.1",
-    "eslint-config-airbnb-base": "^14.2.0",
-    "eslint-config-prettier": "^6.11.0",
-    "eslint-import-resolver-typescript": "^2.0.0",
-    "eslint-plugin-import": "^2.21.2",
-    "eslint-plugin-jest": "^23.17.1",
+    "@types/eslint": "^7.29.0",
+    "@types/jest": "^27.0.2",
+    "@types/node": "^16.11.7",
+    "@typescript-eslint/eslint-plugin": "^5.4.0",
+    "@typescript-eslint/parser": "^5.4.0",
+    "eslint": "^8.2.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-import-resolver-typescript": "^2.5.0",
+    "eslint-plugin-import": "^2.25.3",
+    "eslint-plugin-jest": "^25.2.4",
     "eslint-plugin-jest-formatting": "file:.",
-    "eslint-plugin-prettier": "^3.1.4",
-    "jest": "^26.1.0",
-    "prettier": "2.0.5",
-    "typescript": "^3.9.5",
-    "ts-jest": "^26.1.1"
+    "eslint-plugin-prettier": "^4.0.0",
+    "jest": "^27.3.1",
+    "prettier": "2.4.1",
+    "typescript": "^4.4.4",
+    "ts-jest": "^27.0.7"
   },
   "engines": {
-    "node": "^10.12.0 || >=12.0.0"
+    "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
   },
   "license": "MIT"
 }

src/ast-utils.ts

@@ -66,7 +66,9 @@ export const getPaddingLineSequences = (
 
   if (nextNode.loc.start.line - prevToken.loc.end.line >= 2) {
     do {
-      const token = sourceCode.getTokenAfter(prevToken, { includeComments });
+      const token = sourceCode.getTokenAfter(prevToken, {
+        includeComments,
+      }) as AST.Token;
 
       if (token.loc.start.line - prevToken.loc.end.line >= 2) {
         pairs.push([prevToken, token]);

src/rules/padding.ts

@@ -42,27 +42,13 @@ export const enum PaddingType {
   Always,
 }
 
-type PaddingTester = (
-  prevNode: Node,
-  nextNode: Node,
-  paddingContext: PaddingContext,
-) => void;
-
 // A configuration object for padding type and the two statement types
 export interface Config {
   paddingType: PaddingType;
   prevStatementType: StatementTypes;
   nextStatementType: StatementTypes;
 }
 
-// Tracks position in scope and prevNode. Used to compare current and prev node
-// and then to walk back up to the parent scope or down into the next one.
-// And so on...
-interface Scope {
-  upper: Scope | null;
-  prevNode: Node | null;
-}
-
 interface ScopeInfo {
   prevNode: Node | null;
   enter: () => void;
@@ -76,6 +62,20 @@ interface PaddingContext {
   configs: Config[];
 }
 
+type PaddingTester = (
+  prevNode: Node,
+  nextNode: Node,
+  paddingContext: PaddingContext,
+) => void;
+
+// Tracks position in scope and prevNode. Used to compare current and prev node
+// and then to walk back up to the parent scope or down into the next one.
+// And so on...
+interface Scope {
+  upper: Scope | null;
+  prevNode: Node | null;
+}
+
 // Creates a StatementTester to test an ExpressionStatement's first token name
 const createTokenTester = (tokenName: string): StatementTester => {
   return (node: Node, sourceCode: SourceCode): boolean => {
@@ -143,35 +143,34 @@ const paddingAlwaysTester = (
     message: 'Expected blank line before this statement.',
     fix(fixer: Rule.RuleFixer): Rule.Fix {
       let prevToken = astUtils.getActualLastToken(sourceCode, prevNode);
-      const nextToken =
-        sourceCode.getFirstTokenBetween(prevToken, nextNode, {
-          includeComments: true,
-          /**
-           * Skip the trailing comments of the previous node.
-           * This inserts a blank line after the last trailing comment.
-           *
-           * For example:
-           *
-           *     foo(); // trailing comment.
-           *     // comment.
-           *     bar();
-           *
-           * Get fixed to:
-           *
-           *     foo(); // trailing comment.
-           *
-           *     // comment.
-           *     bar();
-           */
-          filter(token: AST.Token): boolean {
-            if (astUtils.areTokensOnSameLine(prevToken, token)) {
-              prevToken = token;
-              return false;
-            }
-
-            return true;
-          },
-        }) || nextNode;
+      const nextToken = (sourceCode.getFirstTokenBetween(prevToken, nextNode, {
+        includeComments: true,
+        /**
+         * Skip the trailing comments of the previous node.
+         * This inserts a blank line after the last trailing comment.
+         *
+         * For example:
+         *
+         *     foo(); // trailing comment.
+         *     // comment.
+         *     bar();
+         *
+         * Get fixed to:
+         *
+         *     foo(); // trailing comment.
+         *
+         *     // comment.
+         *     bar();
+         */
+        filter(token: AST.Token): boolean {
+          if (astUtils.areTokensOnSameLine(prevToken, token)) {
+            prevToken = token;
+            return false;
+          }
+
+          return true;
+        },
+      }) || nextNode) as AST.Token;
 
       const insertText = astUtils.areTokensOnSameLine(prevToken, nextToken)
         ? '\n\n'