fix: broken indentation of if condition in svelte/indent rule

.changeset/silent-pugs-speak.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-svelte': minor
+---
+
+fix: broken indentation of if condition in `svelte/indent` rule

packages/eslint-plugin-svelte/src/rules/indent-helpers/es.ts

@@ -30,9 +30,9 @@ export function defineVisitor(context: IndentContext): NodeListener {
 	const { sourceCode, offsets, options } = context;
 
 	/**
-	 * Find the root of left node.
+	 * Find the head of chaining nodes.
 	 */
-	function getRootLeft(
+	function getChainHeadNode(
 		node:
 			| TSESTree.AssignmentExpression
 			| TSESTree.AssignmentPattern
@@ -49,13 +49,20 @@ export function defineVisitor(context: IndentContext): NodeListener {
 				parent.type === 'LogicalExpression')
 		) {
 			const prevToken = sourceCode.getTokenBefore(target);
-			if (prevToken && isOpeningParenToken(prevToken)) {
+			const nextToken = sourceCode.getTokenAfter(target);
+			if (
+				prevToken &&
+				isOpeningParenToken(prevToken) &&
+				nextToken &&
+				isClosingParenToken(nextToken)
+			) {
+				// The chain is broken because it is enclosed in parentheses.
 				break;
 			}
 			target = parent;
 			parent = getParent(target);
 		}
-		return target.left;
+		return target;
 	}
 
 	const visitor = {
@@ -116,17 +123,22 @@ export function defineVisitor(context: IndentContext): NodeListener {
 				| TSESTree.BinaryExpression
 				| TSESTree.LogicalExpression
 		) {
-			const leftNode = getRootLeft(node);
+			const baseNode = getChainHeadNode(node);
 			const opToken = sourceCode.getTokenAfter(node.left, {
 				filter: isNotClosingParenToken,
 				includeComments: false
 			})!;
+			const baseToken =
+				baseNode.type === 'AssignmentExpression' || baseNode.type === 'AssignmentPattern'
+					? sourceCode.getFirstToken(baseNode)
+					: getFirstAndLastTokens(sourceCode, baseNode).firstToken;
+			const leftToken = getFirstAndLastTokens(sourceCode, node.left).firstToken;
 			const rightToken = getFirstAndLastTokens(sourceCode, node.right).firstToken;
 
 			offsets.setOffsetToken(
-				[opToken, rightToken],
+				[leftToken === baseToken ? null : leftToken, opToken, rightToken],
 				1,
-				getFirstAndLastTokens(sourceCode, leftNode).firstToken
+				baseToken
 			);
 		},
 		AssignmentPattern(node: TSESTree.AssignmentPattern) {

packages/eslint-plugin-svelte/tests/fixtures/rules/indent/invalid/script-binary02-errors.yaml

@@ -0,0 +1,304 @@
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 3
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 4
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 5
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 6
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 7
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 8
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 9
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 10
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 11
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 12
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 13
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 14
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 15
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 16
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 17
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 18
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 19
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 20
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 21
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 22
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 23
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 24
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 25
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 26
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 27
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 28
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 29
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 30
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 31
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 32
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 33
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 34
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 35
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 36
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 37
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 38
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 39
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 40
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 41
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 42
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 43
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 44
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 45
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 46
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 47
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 48
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 49
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 50
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 51
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 52
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 53
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 54
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 55
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 56
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 57
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 58
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 59
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 60
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 61
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 62
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 63
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 64
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 65
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 66
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 67
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 68
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 69
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 70
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 71
+  column: 1
+  suggestions: null
+- message: Expected indentation of 10 spaces but found 0 spaces.
+  line: 72
+  column: 1
+  suggestions: null
+- message: Expected indentation of 6 spaces but found 0 spaces.
+  line: 73
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 74
+  column: 1
+  suggestions: null
+- message: Expected indentation of 8 spaces but found 0 spaces.
+  line: 75
+  column: 1
+  suggestions: null
+- message: Expected indentation of 4 spaces but found 0 spaces.
+  line: 76
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 77
+  column: 1
+  suggestions: null
+- message: Expected indentation of 2 spaces but found 0 spaces.
+  line: 78
+  column: 1
+  suggestions: null