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code TRUSTS that all Birds can fly bird.fly(); // Crashes when bird is a Penguin! } } // The problem: Penguin IS-A Bird syntactically, but NOT behaviorally const flock: Bird[] = [new Sparrow(), new Penguin()]; releaseBirds(flock); // Runtime explosion72:T445,from abc import ABC, abstractmethod # Base class establishes a contract class Bird(ABC): @abstractmethod def fly(self) -> None: pass @abstractmethod def make_sound(self) -> str: pass # Sparrow is fully substitutable - it honors all contracts class Sparrow(Bird): def fly(self) -> None: print("Sparrow flies through the air") def make_sound(self) -> str: return "Chirp chirp!" # Penguin violates LSP - it cannot fulfill the fly() contract class Penguin(Bird): def fly(self) -> None: # VIOLATION: Raises instead of flying raise NotImplementedError("Penguins cannot fly!") def make_sound(self) -> str: return "Honk!" # Client code written against the base class def release_birds(birds: list[Bird]) -> None: for bird in birds: # This code TRUSTS that all Birds can fly bird.fly() # Crashes when bird is a Penguin! # The problem: Penguin IS-A Bird syntactically, but NOT behaviorally flock: list[Bird] = [Sparrow(), Penguin()] release_birds(flock) # Runtime explosion73:T4b4,// Base class establishes a contract abstract class Bird { abstract void fly(); abstract String makeSound(); } // Sparrow is fully substitutable - it honors all contracts class Sparrow extends Bird { @Override void fly() { System.out.println("Sparrow flies through the air"); } @Override String makeSound() { return "Chirp chirp!"; } } // Penguin violates LSP - it cannot fulfill the fly() contract class Penguin extends Bird { @Override void fly() { // VIOLATION: Throws instead of flying throw new UnsupportedOperationException("Penguins cannot fly!"); } @Override String makeSound() { return "Honk!"; } } // Client code written against the base class public class BirdReleaser { public void releaseBirds(List birds) { for (Bird bird : birds) { // This code TRUSTS that all Birds can fly bird.fly(); // Crashes when bird is a Penguin! } } public static void main(String[] args) { List flock = Arrays.asList(new Sparrow(), new Penguin()); new BirdReleaser().releaseBirds(flock); // Runtime explosion } }74:T4c4,// TYPE-COMPATIBLE but NOT LSP-COMPLIANT interface Stack { push(item: T): void; pop(): T | undefined; peek(): T | undefined; size(): number; } // This implementation is type-compatible class LimitedStack implements Stack { private items: T[] = []; private readonly maxSize: number = 10; push(item: T): void { // VIOLATION: Silently ignores items beyond limit // Parent contract implies push always adds the item if (this.items.length < this.maxSize) { this.items.push(item); } // No error, no indication - item just disappears } pop(): T | undefined { return this.items.pop(); } peek(): T | undefined { return this.items[this.items.length - 1]; } size(): number { return this.items.length; } } // Client code that trusts the Stack contract function processItems(stack: Stack, items: T[]): void { for (const item of items) { stack.push(item); } console.log(`Pushed ${items.length} items, stack size: ${stack.size()}`); } // Works as expected with regular stack // With LimitedStack: "Pushed 100 items, stack size: 10" - DATA LOSS!75:T565,# TYPE-COMPATIBLE but NOT LSP-COMPLIANT from typing import TypeVar, Generic, Protocol from collections.abc import Sequence T = TypeVar('T') class Stack(Protocol[T]): def push(self, item: T) -> None: ... def pop(self) -> T | None: ... def peek(self) -> T | None: ... def size(self) -> int: ... # This implementation is type-compatible class LimitedStack(Generic[T]): def __init__(self, max_size: int = 10): self._items: list[T] = [] self._max_size = max_size def push(self, item: T) -> None: # VIOLATION: Silently ignores items beyond limit # Parent contract implies push always adds the item if len(self._items) < self._max_size: self._items.append(item) # No error, no indication - item just disappears def pop(self) -> T | None: return self._items.pop() if self._items else None def peek(self) -> T | None: return self._items[-1] if self._items else None def size(self) -> int: return len(self._items) # Client code that trusts the Stack contract def process_items(stack: Stack[T], items: Sequence[T]) -> None: for item in items: stack.push(item) print(f"Pushed {len(items)} items, stack size: {stack.size()}") # Works as expected with regular stack # With LimitedStack: "Pushed 100 items, stack size: 10" - DATA LOSS!76:T8f9,// Well-designed: ReadOnlyCollection is genuinely substitutable interface Collection { size(): number; contains(item: T): boolean; iterator(): Iterator; } // ReadOnlyList IS-A Collection - fully substitutable interface ReadOnlyList extends Collection { get(index: number): T; indexOf(item: T): number; } // Separate interface for mutation - doesn't force immutable types to lie interface MutableCollection extends Collection { add(item: T): boolean; remove(item: T): boolean; clear(): void; } // ArrayList implements both - it can do everything both contracts require class ArrayList implements ReadOnlyList, MutableCollection { private items: T[] = []; size(): number { return this.items.length; } contains(item: T): boolean { return this.items.includes(item); } get(index: number): T { return this.items[index]; } indexOf(item: T): number { return this.items.indexOf(item); } add(item: T): boolean { this.items.push(item); return true; } remove(item: T): boolean { const idx = this.items.indexOf(item); if (idx >= 0) { this.items.splice(idx, 1); return true; } return false; } clear(): void { this.items = []; } iterator(): Iterator { return this.items[Symbol.iterator](); } } // ImmutableList implements ONLY ReadOnlyList - honest about its capabilities class ImmutableList implements ReadOnlyList { private readonly items: readonly T[]; constructor(items: T[]) { this.items = [...items]; } size(): number { return this.items.length; } contains(item: T): boolean { return this.items.includes(item); } get(index: number): T { return this.items[index]; } indexOf(item: T): number { return this.items.indexOf(item); } iterator(): Iterator { return this.items[Symbol.iterator](); } // No mutation methods - ImmutableList doesn't pretend to be mutable } // Both are safely substitutable for ReadOnlyList! function countLargeItems(list: ReadOnlyList, predicate: (t: T) => boolean): number { let count = 0; const iter = list.iterator(); let result = iter.next(); while (!result.done) { if (predicate(result.value)) count++; result = iter.next(); } return count; }77:T5b6,// SMELL 1: instanceof before method call function processDocument(doc: Document): void { // If you need to check the type, LSP is violated if (doc instanceof PdfDocument) { doc.renderWithPdfRenderer(); } else if (doc instanceof WordDocument) { doc.renderWithWordRenderer(); } else { // What about new document types? throw new Error("Unknown document type"); } } // SMELL 2: Empty method override class ReadOnlyRepository extends Repository { override save(entity: Entity): void { // Does nothing - violates parent contract } override delete(id: string): void { throw new Error("Cannot delete from read-only repository"); } } // SMELL 3: Type flags controlling behavior class Shape { supportsRotation: boolean = true; rotate(degrees: number): void { if (!this.supportsRotation) { throw new Error("Rotation not supported"); } // Actual rotation logic } } class Line extends Shape { constructor() { super(); this.supportsRotation = false; // Reveals LSP violation } } // SMELL 4: Try-catch around polymorphic calls function exportAllShapes(shapes: Shape[]): void { for (const shape of shapes) { try { shape.export(); // Some shapes throw here } catch (e) { console.log(`Skipping ${shape.constructor.name}: export not supported`); } } 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Within hours, your refund system crashes because cryptocurrency payments throw `UnsupportedOperationException` on refunds. Your validation logic fails silently because crypto payments ignore the validation method entirely. Your logging breaks because crypto payments return `null` for transaction IDs.\n\n**Your system trusted that subclasses would behave like the base class. That trust was violated.**\n\nThis is exactly the kind of failure the **Liskov Substitution Principle (LSP)** is designed to prevent."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Learn","content":"By the end of this page, you will understand LSP's core definition—what substitutability means, why it matters, and how violations create subtle yet devastating bugs. You'll learn to think about inheritance not as code reuse, but as a behavioral contract between types.","variant":"info"},"type":"callout"}]},{"id":"core-definition","title":"The Core Definition of LSP","content":[{"data":{"content":"The Liskov Substitution Principle can be stated simply:\n\n> **If S is a subtype of T, then objects of type T may be replaced with objects of type S without altering any of the desirable properties of the program.**\n\nLet's unpack what this really means. The principle demands that anywhere your code expects a `Parent` type, you should be able to pass any `Child` type without the code breaking, behaving unexpectedly, or requiring special handling."},"type":"text"},{"data":{"icon":"Lightbulb","title":"The Substitution Test","content":"Here's a practical test for LSP: If you have to check `instanceof` or the specific subtype to make your code work correctly, you're likely violating LSP. The whole point is that the caller shouldn't need to know which specific subtype they're dealing with.","variant":"tip"},"type":"callout"},{"data":{"content":"**What \"substitutable\" actually means:**\n\nSubstitutability isn't just about syntax—it's about **behavior**. A subclass is truly substitutable only if it:\n\n1. **Accepts at least everything the parent accepts** — The subclass cannot reject inputs that the parent would accept\n2. **Produces outputs within the parent's range** — The subclass cannot return values the parent would never return\n3. **Maintains all guarantees the parent makes** — If the parent promises certain behavior, the subclass must honor it\n4. **Preserves the parent's invariants** — Properties that are always true for the parent must remain true for the subclass\n\nWhen any of these conditions are violated, code that works with the parent type will fail when given the subclass—often in subtle, hard-to-diagnose ways."},"type":"text"},{"data":{"fileName":"substitutability-example","languages":[{"code":"$71","label":"TypeScript","value":"typescript"},{"code":"$72","label":"Python","value":"python"},{"code":"$73","label":"Java","value":"java"}]},"type":"code"},{"data":{"content":"The Bird/Penguin example is classic because it reveals a fundamental truth: **inheritance should model behavioral compatibility, not just taxonomic classification**.\n\nIn biology, penguins are indeed birds. But in software, inheritance implies more than classification—it implies that the child can do everything the parent can do. A `Penguin` that throws an exception when asked to fly breaks this contract."},"type":"text"}],"titleType":"number","titleNumber":1},{"id":"why-it-matters","title":"Why Substitutability Matters","content":[{"data":{"content":"What's the big deal if one subclass doesn't quite fit? The consequences ripple through your entire codebase in ways that are often invisible until they cause production incidents.\n\n**The trust problem:**\n\nWhen code is written against an abstraction (a base class or interface), it makes assumptions about behavior. These assumptions are implicit contracts:\n\n- If I call `save()`, the data will be persisted\n- If I call `validate()`, I'll get a boolean indicating validity\n- If I call `calculate()`, I'll get a numeric result within expected bounds\n\nEvery piece of code that uses the abstraction depends on these contracts. When a subclass violates them, it doesn't just break one function—it potentially breaks every function that uses that abstraction."},"type":"text"},{"data":{"rows":[["Method throws unexpected exception","Caller crashes without handling","Uncaught exceptions propagate up the stack; system instability"],["Method silently does nothing","Operation appears successful but isn't","Data corruption; inconsistent state; debugging nightmares"],["Method returns unexpected value/type","Caller logic operates on bad data","Wrong decisions propagate; subtle calculation errors"],["Method has side effects parent doesn't have","Unexpected mutations occur","Race conditions; resource leaks; security vulnerabilities"],["Method requires preconditions parent doesn't","Caller fails to provide them","Random failures depending on input; intermittent bugs"]],"caption":"Impact of LSP Violations","headers":["Violation Type","Immediate Effect","Cascading Consequences"]},"type":"table"},{"data":{"icon":"AlertCircle","title":"The Invisible Bug Factory","content":"LSP violations often don't cause immediate crashes. They cause *wrong behavior that appears correct*. Your system continues running, but it's making wrong decisions, corrupting data, or creating technical debt invisibly. These are the bugs that take weeks to diagnose.","variant":"warning"},"type":"callout"},{"data":{"content":"**The polymorphism foundation:**\n\nPolymorphism—the ability to write code that works with any object in a type hierarchy—is one of object-oriented programming's greatest powers. But polymorphism only works if substitutability is guaranteed.\n\nConsider this chain of logic:\n1. I write code that accepts `Shape`\n2. I can pass `Circle`, `Rectangle`, `Triangle` without changing my code\n3. My code doesn't know or care which specific shape it's handling\n4. The system is extensible—new shapes can be added without modifying existing code\n\nThis beautiful property collapses the moment one shape violates the contract. If `InvalidShape` throws exceptions or returns `null` where others return values, my generic code breaks. I'm forced to add `instanceof` checks. Polymorphism degrades into switch statements. The architecture unravels."},"type":"text"},{"data":{"items":["**Fearless refactoring** — You can replace one implementation with another, confident the system won't break","**Genuine abstraction** — Code can truly be written against interfaces, not implementations","**Safe extension** — New subclasses can be added without touching existing code","**Testable design** — Mock objects can substitute for real ones during testing","**Framework trust** — Libraries can provide extension points that users can safely implement"],"title":{"icon":"Target","text":"What LSP Enables","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"titleType":"number","titleNumber":2},{"id":"substitutability-vs-type","title":"Substitutability vs. Type Compatibility","content":[{"data":{"content":"A critical distinction: Your compiler or type checker verifying that `Child extends Parent` is not the same as LSP compliance. **LSP is about behavioral compatibility, not syntactic compatibility.**\n\nThe compiler checks:\n- Does this class have all required methods?\n- Do the method signatures match?\n- Are the return types compatible?\n\nLSP additionally requires:\n- Does this implementation behave consistently with the parent?\n- Does it honor implicit contracts?\n- Does it preserve invariants?"},"type":"text"},{"data":{"left":[{"data":{"items":["Method exists in subclass","Parameter types are compatible","Return type is compatible","Access modifiers are valid","No missing abstract implementations"],"title":{"icon":"CheckCircle","text":"Compiler Checks","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["Method behavior matches parent's contract","No unexpected exceptions thrown","Output values within expected ranges","No strengthened preconditions","Parent's invariants maintained"],"title":{"icon":"Lightbulb","text":"LSP Requires Additionally","type":"icon","color":"accent","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"fileName":"type-vs-behavior","languages":[{"code":"$74","label":"TypeScript","value":"typescript"},{"code":"$75","label":"Python","value":"python"}]},"type":"code"},{"data":{"icon":"AlertCircle","title":"The Type System Can't Save You","content":"The LimitedStack compiles perfectly. TypeScript, Python, Java—none of them will catch this bug. The violation is behavioral, not syntactic. This is why LSP requires programmer discipline beyond what any type system can verify.","variant":"error"},"type":"callout"},{"data":{"content":"**The fix requires behavioral alignment:**\n\nIf `LimitedStack` can't accept all items, it must signal this clearly:\n- Throw an exception when full (explicit failure)\n- Return a boolean indicating success (explicit result)\n- Use a different interface (`BoundedStack`) that documents the limit\n\nThe key is that client code must not be surprised. Either the subclass behaves exactly like the parent, or it uses a different type that communicates its different behavior."},"type":"text"}],"titleType":"number","titleNumber":3},{"id":"hierarchy-design","title":"The Hierarchy Design Problem","content":[{"data":{"content":"LSP violations often stem from a fundamental mistake: using inheritance for reasons other than behavioral compatibility.\n\n**Common misuses of inheritance:**"},"type":"text"},{"data":{"items":["**Code reuse** — \"I want to reuse some methods\" → Use composition instead","**Taxonomic classification** — \"In the real world, X is a type of Y\" → Software models behavior, not biology","**Reducing duplication** — \"These classes share some fields\" → Extract a shared component","**Fitting into a framework** — \"The framework expects this class\" → Consider adapters or decorators","**Convenience** — \"It's easier to extend than write from scratch\" → Technical debt accumulates"],"title":{"icon":"XCircle","text":"Wrong Reasons to Inherit","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"content":"**The right reason to inherit:**\n\nInheritance should be used when and only when the child genuinely **is a** specialization of the parent in terms of *behavior*. The child should:\n\n- Be able to fulfill every responsibility of the parent\n- Add new capabilities without modifying existing ones\n- Represent a true conceptual specialization\n\nLet's examine a properly designed hierarchy:"},"type":"text"},{"data":{"fileName":"proper-hierarchy","languages":[{"code":"$76","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"icon":"CheckCircle","title":"Honest Type Hierarchies","content":"Notice how ImmutableList doesn't implement MutableCollection and pretend mutations work. It only claims to be what it truly is. This is LSP-compliant design: types only promise what they can deliver.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"recognizing-failures","title":"Recognizing Substitutability Failures","content":[{"data":{"content":"How do you know if your hierarchy has substitutability problems? Watch for these warning signs in your codebase:"},"type":"text"},{"data":{"items":["**`instanceof` checks before method calls** — If you need to know the concrete type to call a method safely, substitutability is broken","**Empty or exception-throwing method overrides** — Methods that say \"I can't do this\" reveal a bad hierarchy","**Methods that return special values for some subtypes** — Returning `null`, `-1`, or empty results where parent returns meaningful data","**Documentation warning about specific subtypes** — \"Note: This doesn't work with X subclass\" is a confession of LSP violation","**Defensive code in callers** — Try-catch blocks around polymorphic calls; null checks on results that shouldn't be null","**Flags or type fields controlling behavior** — When the object needs to tell callers what it can or can't do"],"title":{"icon":"AlertCircle","text":"Red Flags in Your Code","type":"icon","color":"accent","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"fileName":"lsp-violation-smells","languages":[{"code":"$77","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"content":"Each of these smells indicates the same underlying problem: **the inheritance hierarchy doesn't represent true behavioral compatibility**. The code is forced to work around the fact that not all subclasses are truly substitutable."},"type":"text"},{"data":{"icon":"Lightbulb","title":"The Refactoring Hint","content":"When you see these patterns, it's usually a sign that you need either (1) a different hierarchy where subtypes don't inherit capabilities they don't have, (2) smaller, more focused interfaces that subtypes can honestly implement, or (3) composition instead of inheritance.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"summary","title":"Summary: The Substitution Contract","content":[{"data":{"content":"We've established the foundational understanding of what LSP means and why it matters. Let's crystallize the key insights:"},"type":"text"},{"data":{"type":"ordered","items":["**LSP is about behavior, not syntax** — A subclass must behave consistently with its parent, not just compile against it","**Substitutability enables polymorphism** — Without LSP, generic code falls apart into type-checking cascades","**The compiler can't verify LSP** — Behavioral contracts are implicit; programmers must enforce them","**Inheritance means 'can do everything parent does'** — Not 'is taxonomically related' or 'shares some code'","**Warning signs are visible** — `instanceof`, empty overrides, defensive try-catch blocks all signal violations","**Good hierarchies are honest** — Types only inherit interfaces they can fully implement"],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's next:**\n\nWe've established the conceptual foundation. The next page dives into Barbara Liskov's original formulation of this principle—the precise, rigorous definition that computer scientists use. Understanding her formulation will give you the analytical tools to reason about substitutability with precision."},"type":"text"},{"data":{"icon":"CheckCircle","title":"Page Complete","content":"You now understand LSP's core definition: subclasses must be fully substitutable for their base classes. This isn't about satisfying a type checker—it's about ensuring behavioral compatibility that makes polymorphism work. Next, we'll explore Barbara Liskov's formal articulation of this principle.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":6}],"isLocked":false},{"id":"seed_8a88ec0ea95891df1504e529ca80c5f8","title":"Barbara Liskov's Formulation","order":1,"content":null,"isLocked":true},{"id":"seed_eae390dd794dda246b2c26751fb94ea0","title":"LSP as Behavioral Contract","order":2,"content":null,"isLocked":true},{"id":"seed_0ecb649b256754c57e0d22eab16e6c40","title":"Why LSP Matters for Polymorphism","order":3,"content":null,"isLocked":true}]}},"dataUpdateCount":1,"dataUpdatedAt":1792309799326,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getModule"],{"input":{"slug":"what-is-lsp"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getModule\"],{\"input\":{\"slug\":\"what-is-lsp\"},\"type\":\"query\"}]"},{"dehydratedAt":1792309799413,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792309799328,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["learningContent","getProgress"],{"input":{"moduleId":"seed_afc835817fb7592a99aa60d376d9d127"},"type":"query"}],"queryHash":"[[\"learningContent\",\"getProgress\"],{\"input\":{\"moduleId\":\"seed_afc835817fb7592a99aa60d376d9d127\"},\"type\":\"query\"}]"},{"dehydratedAt":1792309799413,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792309799328,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","get"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8a88ec0ea95891df1504e529ca80c5f8"},"type":"query"}],"queryHash":"[[\"feedback\",\"get\"],{\"input\":{\"contentId\":\"seed_8a88ec0ea95891df1504e529ca80c5f8\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792309799413,"state":{"data":{"json":null},"dataUpdateCount":1,"dataUpdatedAt":1792309799328,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["feedback","getUserLike"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8a88ec0ea95891df1504e529ca80c5f8"},"type":"query"}],"queryHash":"[[\"feedback\",\"getUserLike\"],{\"input\":{\"contentId\":\"seed_8a88ec0ea95891df1504e529ca80c5f8\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792309799413,"state":{"data":{"json":[]},"dataUpdateCount":1,"dataUpdatedAt":1792309799328,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"success","fetchStatus":"idle"},"queryKey":[["highlights","getHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8a88ec0ea95891df1504e529ca80c5f8"},"type":"query"}],"queryHash":"[[\"highlights\",\"getHighlights\"],{\"input\":{\"contentId\":\"seed_8a88ec0ea95891df1504e529ca80c5f8\",\"contentType\":\"LEARNING_PAGE\"},\"type\":\"query\"}]"},{"dehydratedAt":1792309799413,"state":{"data":"$undefined","dataUpdateCount":0,"dataUpdatedAt":0,"error":null,"errorUpdateCount":0,"errorUpdatedAt":0,"fetchFailureCount":0,"fetchFailureReason":null,"fetchMeta":null,"isInvalidated":false,"status":"pending","fetchStatus":"fetching"},"queryKey":[["highlights","getPopularHighlights"],{"input":{"contentType":"LEARNING_PAGE","contentId":"seed_8a88ec0ea95891df1504e529ca80c5f8","minCount":2},"type":"query"}],"queryHash":"[[\"highlights\",\"getPopularHighlights\"],{\"input\":{\"contentId\":\"seed_8a88ec0ea95891df1504e529ca80c5f8\",\"contentType\":\"LEARNING_PAGE\",\"minCount\":2},\"type\":\"query\"}]","promise":"$@78"}]},"children":"$L79"}]