diff --git a/.eslintrc.js b/.eslintrc.js
index b3b4d755f..4f9231b90 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -38,6 +38,9 @@ module.exports = {
       "error",
       // `!foo === bar` and `!foo !== bar`
       'BinaryExpression[operator=/^[!=]==$/] > UnaryExpression.left[operator="!"]',
+      // `(() => (foo ? bar : baz))()`
+      // TODO: Remove this when https://github.com/sindresorhus/eslint-plugin-unicorn/issues/1730 get implemented
+      'CallExpression[callee.type="ArrowFunctionExpression"][callee.body.type="ConditionalExpression"]',
     ],
     "no-return-await": "error",
     "no-unneeded-ternary": "error",
diff --git a/src/language-yaml/utils.js b/src/language-yaml/utils.js
index b1fde2d26..39b768fcc 100644
--- a/src/language-yaml/utils.js
+++ b/src/language-yaml/utils.js
@@ -253,12 +253,15 @@ function getBlockValueLineContents(
           // exclude open line `>` or `|`
           .match(/^[^\n]*\n(.*)$/s)[1];
 
-  const leadingSpaceCount =
-    node.indent === null
-      ? ((match) => (match ? match[1].length : Number.POSITIVE_INFINITY))(
-          content.match(/^( *)[^\n\r ]/m)
-        )
-      : node.indent - 1 + parentIndent;
+  let leadingSpaceCount;
+  if (node.indent === null) {
+    const matches = content.match(/^(?<leadingSpace> *)[^\n\r ]/m);
+    leadingSpaceCount = matches
+      ? matches.groups.leadingSpace.length
+      : Number.POSITIVE_INFINITY;
+  } else {
+    leadingSpaceCount = node.indent - 1 + parentIndent;
+  }
 
   const rawLineContents = content
     .split("\n")