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kubejs/dx/eslint-plugin/call-chains.mjs

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+// @ts-check
+/**
+ * "When dealing with long concatenated method calls or extended lists of parameters,
+ * indent any continuations of that statement on a new line,
+ * in the same way that one would indent the body of an if statement or for loop."
+ */
+
+import { ESLintUtils } from "@typescript-eslint/utils"
+
+export default ESLintUtils.RuleCreator.withoutDocs({
+    meta: {
+        type: "problem",
+        hasSuggestions: true,
+        fixable: "code",
+        messages: {
+            "chain-too-long": "There are too many calls in this chain, and no newlines."
+        },
+        schema: [],
+    },
+    defaultOptions: [],
+    create(context) {
+        return {
+            CallExpression(node) {
+                let chainCount = 0
+                for(let iNode = node;
+                    iNode.callee.type === "MemberExpression" && iNode.callee.object.type === "CallExpression";
+                    iNode = iNode.callee.object
+                ) {
+                    if(context.sourceCode.text.slice(
+                        iNode.callee.object.range[1],
+                        iNode.callee.property.range[0]
+                    ).includes("\n"))
+                        break
+                    chainCount++
+                }
+
+                if(chainCount < 3)
+                    return
+
+
+                context.report({
+                    messageId: "chain-too-long",
+                    node
+                })
+            },
+        }
+    },
+})