Replace nyc with c8 (#1686)

.github/workflows/main.yml

@@ -36,7 +36,7 @@ jobs:
       - run: npm install
       - run: npm run lint
       # Force update snapshots, https://github.com/avajs/ava/discussions/2754
-      - run: npx nyc ava --update-snapshots
+      - run: npx c8 ava --update-snapshots
         env:
           AVA_FORCE_CI: not-ci
       - run: npm run generate-rules-table

.gitignore

@@ -1,6 +1,5 @@
 node_modules
 yarn.lock
-.nyc_output
 coverage
 package-lock.json
 /test/integration/fixtures

package.json

@@ -29,7 +29,7 @@
 		"run-rules-on-codebase": "node ./test/run-rules-on-codebase/lint.mjs",
 		"smoke": "eslint-remote-tester --config ./test/smoke/eslint-remote-tester.config.js",
 		"test": "npm-run-all --continue-on-error lint test:*",
-		"test:js": "nyc ava"
+		"test:js": "c8 ava"
 	},
 	"files": [
 		"index.js",
@@ -69,6 +69,7 @@
 		"@lubien/fixture-beta-package": "^1.0.0-beta.1",
 		"@typescript-eslint/parser": "^5.7.0",
 		"ava": "^3.15.0",
+		"c8": "^7.11.0",
 		"chalk": "^5.0.0",
 		"enquirer": "^2.3.6",
 		"eslint": "^8.6.0",
@@ -83,7 +84,6 @@
 		"mem": "^9.0.1",
 		"npm-package-json-lint": "^5.4.2",
 		"npm-run-all": "^4.1.5",
-		"nyc": "^15.1.0",
 		"outdent": "^0.8.0",
 		"typescript": "^4.5.4",
 		"vue-eslint-parser": "^8.0.1",
@@ -98,7 +98,7 @@
 			"test/unit/*.mjs"
 		]
 	},
-	"nyc": {
+	"c8": {
 		"reporter": [
 			"text",
 			"lcov"

rules/catch-error-name.js

@@ -65,7 +65,7 @@ const create = context => {
 
 			// This was reported https://github.com/sindresorhus/eslint-plugin-unicorn/issues/1075#issuecomment-768072967
 			// But can't reproduce, just ignore this case
-			/* istanbul ignore next */
+			/* c8 ignore next 3 */
 			if (!variable) {
 				return;
 			}

rules/consistent-function-scoping.js

@@ -46,13 +46,13 @@ function checkReferences(scope, parent, scopeManager) {
 		const identifierScope = scopeManager.acquire(identifier);
 
 		// If we have a scope, the earlier checks should have worked so ignore them here
-		/* istanbul ignore next: Hard to test */
+		/* c8 ignore next 3 */
 		if (identifierScope) {
 			return false;
 		}
 
 		const identifierParentScope = scopeManager.acquire(identifier.parent);
-		/* istanbul ignore next: Hard to test */
+		/* c8 ignore next 3 */
 		if (!identifierParentScope) {
 			return false;
 		}

rules/expiring-todo-comments.js

@@ -192,7 +192,8 @@ function reachedDate(past) {
 }
 
 function tryToCoerceVersion(rawVersion) {
-	/* istanbul ignore if: version in `package.json` and comment can't be empty */
+	// `version` in `package.json` and comment can't be empty
+	/* c8 ignore next 3 */
 	if (!rawVersion) {
 		return false;
 	}
@@ -215,12 +216,14 @@ function tryToCoerceVersion(rawVersion) {
 
 	// Get only the first member for cases such as `1.0.0 - 2.9999.9999`
 	const parts = version.split(' ');
-	/* istanbul ignore if: We don't have this `package.json` to test */
+	// We don't have this `package.json` to test
+	/* c8 ignore next 3 */
 	if (parts.length > 1) {
 		version = parts[0];
 	}
 
-	/* istanbul ignore if: We don't have this `package.json` to test */
+	// We don't have this `package.json` to test
+	/* c8 ignore next 3 */
 	if (semver.valid(version)) {
 		return version;
 	}
@@ -230,7 +233,8 @@ function tryToCoerceVersion(rawVersion) {
 		// But coerce can't parse pre-releases.
 		return semver.parse(version) || semver.coerce(version);
 	} catch {
-		/* istanbul ignore next: We don't have this `package.json` to test */
+		// We don't have this `package.json` to test
+		/* c8 ignore next 3 */
 		return false;
 	}
 }
@@ -403,11 +407,12 @@ const create = context => {
 			const todoVersion = tryToCoerceVersion(dependency.version);
 			const targetPackageVersion = tryToCoerceVersion(targetPackageRawVersion);
 
-			/* istanbul ignore if: Can't test in Node.js */
+			/* c8 ignore start */
 			if (!hasTargetPackage || !targetPackageVersion) {
 				// Can't compare `¯\_(ツ)_/¯`
 				continue;
 			}
+			/* c8 ignore end */
 
 			const compare = semverComparisonForOperator(dependency.condition);
 
@@ -431,7 +436,7 @@ const create = context => {
 			const targetPackageRawEngineVersion = packageEngines.node;
 			const hasTargetEngine = Boolean(targetPackageRawEngineVersion);
 
-			/* istanbul ignore if: Can't test in this repo */
+			/* c8 ignore next 3 */
 			if (!hasTargetEngine) {
 				continue;
 			}

rules/fix/append-argument.js

@@ -4,7 +4,7 @@ const {isCommaToken} = require('eslint-utils');
 function appendArgument(fixer, node, text, sourceCode) {
 	// This function should also work for `NewExpression`
 	// But parentheses of `NewExpression` could be omitted, add this check to prevent accident use on it
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (node.type !== 'CallExpression') {
 		throw new Error(`Unexpected node "${node.type}".`);
 	}

rules/fix/remove-argument.js

@@ -17,13 +17,14 @@ function removeArgument(fixer, node, sourceCode) {
 	}
 
 	// If the removed argument is the only argument, the trailing comma must be removed too
-	/* istanbul ignore next: Not reachable for now */
+	/* c8 ignore start */
 	if (callExpression.arguments.length === 1) {
 		const tokenAfter = sourceCode.getTokenBefore(lastToken);
 		if (isCommaToken(tokenAfter)) {
 			end = tokenAfter[1];
 		}
 	}
+	/* c8 ignore end */
 
 	return fixer.replaceTextRange([start, end], '');
 }

rules/import-style.js

@@ -99,7 +99,7 @@ const getActualAssignmentTargetImportStyles = assignmentTarget => {
 	// Next line is not test-coverable until unforceable changes to the language
 	// like an addition of new AST node types usable in `const __HERE__ = foo;`.
 	// An exotic custom parser or a bug in one could cover it too.
-	/* istanbul ignore next */
+	/* c8 ignore next */
 	return [];
 };
 

rules/no-array-for-each.js

@@ -319,7 +319,8 @@ function isFixable(callExpression, {scope, functionInfo, allIdentifiers, context
 	}
 
 	// Check `CallExpression.callee`
-	/* istanbul ignore next: Because of `ChainExpression` wrapper, `foo?.forEach()` is already failed on previous check, keep this just for safety */
+	// Because of `ChainExpression` wrapper, `foo?.forEach()` is already failed on previous check keep this just for safety
+	/* c8 ignore next 3 */
 	if (callExpression.callee.optional) {
 		return false;
 	}

rules/no-array-push-push.js

@@ -34,7 +34,7 @@ function getFirstExpression(node, sourceCode) {
 		}
 	}
 
-	/* istanbul ignore next */
+	/* c8 ignore next */
 	throw new Error('Cannot find the first `Array#push()` call.\nPlease open an issue at https://github.com/sindresorhus/eslint-plugin-unicorn/issues/new?title=%60no-array-push-push%60%3A%20Cannot%20find%20first%20%60push()%60');
 }
 

rules/no-keyword-prefix.js

@@ -52,7 +52,7 @@ function checkObjectPattern(report, node, options) {
 	const {name, parent} = node;
 	const keyword = findKeywordPrefix(name, options);
 
-	/* istanbul ignore next: Can't find a case to cover this line */
+	/* c8 ignore next 3 */
 	if (parent.shorthand && parent.value.left && Boolean(keyword)) {
 		report(node, keyword);
 	}

rules/no-static-only-class.js

@@ -140,7 +140,7 @@ function switchClassToObject(node, sourceCode) {
 
 	return function * (fixer) {
 		const classToken = sourceCode.getFirstToken(node);
-		/* istanbul ignore next */
+		/* c8 ignore next */
 		assertToken(classToken, {
 			expected: {type: 'Keyword', value: 'class'},
 			ruleId: 'no-static-only-class',

rules/prefer-array-find.js

@@ -127,14 +127,14 @@ const hasLowerPrecedence = (node, operator) => (
 	))
 	|| node.type === 'ConditionalExpression'
 	// Lower than `assignment`, should already parenthesized
-	/* istanbul ignore next */
+	/* c8 ignore next */
 	|| node.type === 'AssignmentExpression'
 	|| node.type === 'YieldExpression'
 	|| node.type === 'SequenceExpression'
 );
 
 const getDestructuringLeftAndRight = node => {
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (!node) {
 		return {};
 	}

rules/prefer-default-parameters.js

@@ -152,7 +152,7 @@ const create = context => {
 
 		// This was reported https://github.com/sindresorhus/eslint-plugin-unicorn/issues/1122
 		// But can't reproduce, just ignore this case
-		/* istanbul ignore next */
+		/* c8 ignore next 3 */
 		if (!variable) {
 			return;
 		}

rules/prefer-export-from.js

@@ -194,7 +194,7 @@ function getExported(identifier, context, sourceCode) {
 function isVariableUnused(node, context) {
 	const variables = context.getDeclaredVariables(node);
 
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (variables.length !== 1) {
 		return false;
 	}

rules/prefer-keyboard-event-key.js

@@ -67,7 +67,7 @@ const getParentByLevel = (node, level) => {
 		current = current.parent;
 	}
 
-	/* istanbul ignore else */
+	/* c8 ignore next 3 */
 	if (level === 0) {
 		return current;
 	}

rules/prefer-set-has.js

@@ -75,7 +75,7 @@ const selector = [
 ].join('');
 
 const isIncludesCall = node => {
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (!node.parent || !node.parent.parent) {
 		return false;
 	}
@@ -131,7 +131,7 @@ const create = context => ({
 
 		// This was reported https://github.com/sindresorhus/eslint-plugin-unicorn/issues/1075#issuecomment-768073342
 		// But can't reproduce, just ignore this case
-		/* istanbul ignore next */
+		/* c8 ignore next 3 */
 		if (!variable) {
 			return;
 		}

rules/prefer-ternary.js

@@ -22,7 +22,7 @@ const selector = [
 const isTernary = node => node && node.type === 'ConditionalExpression';
 
 function getNodeBody(node) {
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (!node) {
 		return;
 	}

rules/selectors/not-dom-node.js

@@ -14,10 +14,11 @@ const impossibleNodeTypes = [
 ];
 
 // We might need this later
-/* istanbul ignore next */
+/* c8 ignore start */
 const isNotDomNode = node =>
 	impossibleNodeTypes.includes(node.type)
 	|| (node.type === 'Identifier' && node.name === 'undefined');
+/* c8 ignore end */
 
 const notDomNodeSelector = node => [
 	...impossibleNodeTypes.map(type => `[${node}.type!="${type}"]`),

rules/utils/get-builtin-rule.js

@@ -3,7 +3,7 @@
 function getBuiltinRule(id) {
 	// TODO: Remove this when we drop support for ESLint 7
 	const eslintVersion = require('eslint/package.json').version;
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (eslintVersion.startsWith('7.')) {
 		return require(`eslint/lib/rules/${id}`);
 	}

rules/utils/get-key-name.js

@@ -7,7 +7,8 @@ function getKeyOrPropertyName(keyOrProperty, computed, scope) {
 			return keyOrProperty.name;
 		}
 
-		/* istanbul ignore next: It could be `PrivateIdentifier`(ESTree) or `PrivateName`(Babel) when it's in `class` */
+		// It could be `PrivateIdentifier`(ESTree) or `PrivateName`(Babel) when it's in `class`
+		/* c8 ignore next */
 		return;
 	}
 

rules/utils/is-function-self-used-inside.js

@@ -14,7 +14,7 @@ Check if `this`, `arguments`, or the function name is used inside of itself.
 @returns {boolean}
 */
 function isFunctionSelfUsedInside(functionNode, functionScope) {
-	/* istanbul ignore next */
+	/* c8 ignore next 3 */
 	if (functionScope.block !== functionNode) {
 		throw new Error('"functionScope" should be the scope of "functionNode".');
 	}

rules/utils/is-same-reference.js

@@ -41,16 +41,16 @@ function getStaticPropertyName(node) {
 			property = node.property;
 			break;
 
-		/* istanbul ignore next: Hard to test */
+		/* c8 ignore next 2 */
 		case 'ChainExpression':
 			return getStaticPropertyName(node.expression);
 
-		/* istanbul ignore next: Only reachable when use this to get class/object member key */
+		// Only reachable when use this to get class/object member key
+		/* c8 ignore next */
 		case 'Property':
 		case 'MethodDefinition':
-			/* istanbul ignore next */
+			/* c8 ignore next 2 */
 			property = node.key;
-			/* istanbul ignore next */
 			break;
 
 			// No default

rules/utils/rule.js

@@ -24,7 +24,7 @@ function wrapFixFunction(fix) {
 					return;
 				}
 
-				/* istanbul ignore next: Safe */
+				/* c8 ignore next */
 				throw error;
 			}
 		}

rules/utils/should-add-parentheses-to-logical-expression-child.js

@@ -7,7 +7,8 @@ Check if parentheses should be added to a `node` when it's used as child of `Log
 @returns {boolean}
 */
 function shouldAddParenthesesToLogicalExpressionChild(node, {operator, property}) {
-	/* istanbul ignore next: When operator or property is different, need check `LogicalExpression` operator precedence, not implemented */
+	// When operator or property is different, need check `LogicalExpression` operator precedence, not implemented
+	/* c8 ignore next 3 */
 	if (operator !== '??' || property !== 'left') {
 		throw new Error('Not supported.');
 	}

rules/utils/should-add-parentheses-to-member-expression-object.js

@@ -26,7 +26,7 @@ function shouldAddParenthesesToMemberExpressionObject(node, sourceCode) {
 		case 'NewExpression':
 			return !isNewExpressionWithParentheses(node, sourceCode);
 		case 'Literal': {
-			/* istanbul ignore next */
+			/* c8 ignore next */
 			if (isDecimalIntegerNode(node)) {
 				return true;
 			}