TypeScript Traps: Top 10 Mistakes Developers Make and How to Dodge Them

This content originally appeared on DEV Community and was authored by Talha Ahsan

Introduction

TypeScript has become a popular choice for developers because it adds extra features to JavaScript, like type-checking, which helps catch errors before the code even runs. By making sure each variable has a specific type, TypeScript can help prevent common mistakes and make code easier to understand and work with, especially in large projects.

However, when people start learning TypeScript, they often run into some common issues. These mistakes can make code harder to read or lead to bugs that TypeScript is supposed to help avoid. Learning about these mistakes and how to avoid them can make a huge difference in code quality. It helps you write cleaner, safer code and saves time debugging later on. This guide will walk you through the most common TypeScript mistakes and give you practical tips for avoiding them.

Mistake #1: Misusing Type Assertions

What Are Type Assertions?

In TypeScript, type assertions are a way to tell TypeScript, “Trust me, I know what type this variable should be.” For example, if TypeScript isn’t sure what type something is, you can use a type assertion to make it behave as a certain type.

Here’s a simple example:

let value: any = "Hello, world!";
let stringLength = (value as string).length;

In this case, we're telling TypeScript, “I know that value is a string,” so TypeScript lets us use string features on it (like .length).

Common Problems with Type Assertions

While type assertions can be helpful, they can also cause problems if misused. When you force TypeScript to treat a variable as a certain type without proper checks, it may lead to errors in your code, especially if the type isn’t actually what you think it is.

For instance:

let value: any = 42;
let stringLength = (value as string).length; // This will throw an error at runtime

Here, we’re telling TypeScript that value is a string, but in reality, it’s a number. This won’t show an error in TypeScript, but it will cause a problem when the code actually runs, leading to unexpected runtime errors.

Why Overusing Type Assertions Can Be Risky

Overusing type assertions can create issues because TypeScript loses some of its ability to catch errors. Type assertions tell TypeScript to “ignore” what type something actually is, which can defeat the purpose of using TypeScript in the first place. TypeScript is meant to help catch errors, but if we keep asserting types, it can miss issues and let bugs slip through.

How to Avoid This Mistake

1. Use Type Inference When Possible: TypeScript can often figure out the type on its own. Instead of using assertions, let TypeScript infer types where it can.

2. Avoid Using any Unnecessarily: The any type can make it tempting to use type assertions, but any removes type safety. Use specific types instead, which reduces the need for assertions.

3. Add Checks Before Type Assertions: If you’re unsure of a type, check it first. For example:
   

   let value: any = 42;
   if (typeof value === 'string') {
       let stringLength = (value as string).length;
   }

1. Use unknown Instead of any: The unknown type is safer than any because TypeScript requires you to check the type before using it, helping avoid unsafe assertions.

Type assertions can be a useful tool, but they should be used carefully and sparingly. By following these best practices, you can make your TypeScript code more reliable and reduce the risk of runtime errors.

Mistake #2: Overusing the any Type

What is the any Type?

In TypeScript, the any type is a way to tell TypeScript, “I don’t know or care what type this is.” When you set a variable’s type to any, TypeScript stops checking that variable’s type. This means you can do pretty much anything with it—use it as a string, a number, an object, etc.—without TypeScript throwing any errors.

Example:

let value: any = "Hello!";
value = 42; // No problem, even though it started as a string.

Why any Can Cause Problems

While any might seem helpful, it can cause issues because it turns off TypeScript’s safety features. The whole point of TypeScript is to help catch errors by ensuring you’re using the right types. But when you use any, TypeScript can’t check that variable for errors, which can lead to bugs.

For example:

let value: any = "Hello!";
console.log(value.toUpperCase()); // This is fine
value = 42;
console.log(value.toUpperCase()); // TypeScript won’t catch this, but it will cause an error at runtime

In this case, because value is any, TypeScript allows value.toUpperCase() even when value is a number, which will cause an error when you try to run the code.

Common Reasons Developers Use any

1. Quick Fixes: Sometimes, developers set a type to any just to make an error go away quickly.
2. Uncertain Types: When the type of data isn’t clear, developers might use any instead of figuring out the right type.
3. Complex Data: If data is complex, like an API response with multiple properties, developers might use any to avoid typing out the structure.

While using any in these cases may seem easier, it often causes bigger issues in the long run.

How to Avoid Overusing any

1. Use unknown Instead of any: The unknown type is safer because it requires you to check the type before using it. With unknown, TypeScript will force you to confirm that the variable is a certain type before you use it.

   let value: unknown = "Hello!";
   if (typeof value === "string") {
       console.log(value.toUpperCase());
   }

1. Define Specific Types: Try to define the exact type for each variable. For example, if you know value will always be a string, use string instead of any.

   let value: string = "Hello!";

1. Use Interfaces for Complex Data: For objects or complex data, create an interface that describes the structure. This way, TypeScript can check each property and ensure your data matches what you expect.

   interface User {
       name: string;
       age: number;
   }

   let user: User = { name: "Alice", age: 25 };

1. Only Use any as a Last Resort: If you absolutely have to use any, try to limit it to a small part of your code and add comments explaining why it’s necessary.

By avoiding any and using unknown or specific types, you can make your code safer and reduce the risk of unexpected errors, making your TypeScript code stronger and more reliable.

Mistake #3: Confusing any and unknown

What’s the Difference Between any and unknown?

In TypeScript, both any and unknown are types you can use when you’re not sure about the exact type of a variable. But there’s an important difference:

• any: Allows you to do anything with the variable without any type-checking. It essentially turns off TypeScript’s safety features.
• unknown: Requires you to check the type before using the variable in a specific way. It’s a safer option because TypeScript will prevent you from using it in ways that don’t make sense until you verify its type.

Why unknown is Often Safer

Using unknown is usually safer than any because it forces you to check the type before using the variable. This helps prevent errors that can happen when you’re not sure what type you’re working with.

For example, imagine you’re working with a variable and you don’t know if it’s a string or a number:

let value: unknown = "Hello!";
if (typeof value === "string") {
    console.log(value.toUpperCase()); // Safe to use as a string
}

Here, since value is unknown, TypeScript won’t let you use value.toUpperCase() until you confirm it’s a string. If you try to use toUpperCase() without the type check, TypeScript will show an error, helping prevent runtime bugs.

On the other hand, with any:

let value: any = "Hello!";
console.log(value.toUpperCase()); // Works, but if value becomes a number, it will crash

If value later becomes a number, this code will throw an error when it runs, and TypeScript won’t warn you about it. Using unknown helps avoid this issue by requiring a type check first.

How to Choose Between any and unknown

1. Use unknown When Type Is Uncertain: If you don’t know what type a variable will have and need to perform checks before using it, use unknown. It’s safer because TypeScript will make sure you check the type before doing anything specific with it.

2. Avoid any When Possible: any should be a last resort because it removes TypeScript’s type-checking. Only use any if you’re sure you don’t need to check the type at all, and it truly doesn’t matter.

3. Add Type Checks with unknown: Whenever you use unknown, remember to add checks before using it. This keeps TypeScript’s safety features active and helps prevent unexpected bugs.

4. Prefer Specific Types: If you know what the type will be, use that type instead of any or unknown. This makes your code more predictable and easier to understand.

Using unknown can keep your code safer and prevent errors that might slip through with any. It encourages good habits, like always knowing what type of data you’re working with, so you can write more reliable TypeScript code.

Mistake #4: Ignoring Null and Undefined Values

Understanding Null and Undefined in TypeScript

In TypeScript, null and undefined represent values that are “empty” or “not set.”

• null is used when something intentionally has no value, like when a field in a form is left blank on purpose.
• undefined means a value hasn’t been assigned yet, like when a variable is created but not given a value.

If you ignore these “empty” values, it can lead to errors when you try to use variables that might be null or undefined.

Common Errors with Null and Undefined

When TypeScript doesn’t account for null or undefined, you might try to use a variable as if it has a value, only to find it doesn’t. This can lead to runtime errors (errors that happen when your code runs).

For example:

let user: { name: string } | null = null;
console.log(user.name); // This will cause an error, because user is null

Here, user is null, so trying to access user.name will throw an error. If you don’t handle cases where values might be null or undefined, your code might break unexpectedly.

How to Avoid This Mistake

1. Use Optional Chaining (?.): Optional chaining is a feature in TypeScript that helps you safely access properties even if the object might be null or undefined. With ?., TypeScript will check if the object exists before trying to access the property. If it doesn’t, it just returns undefined instead of throwing an error.

   let user: { name: string } | null = null;
   console.log(user?.name); // No error; just returns undefined

1. Non-Null Assertion (!): Sometimes you know for sure that a value isn’t null or undefined at a certain point in your code, but TypeScript isn’t sure. You can use the non-null assertion (!) to tell TypeScript, “I know this value isn’t null or undefined.” However, use this carefully because if the value does turn out to be null, you’ll still get an error.

   let user: { name: string } | null = { name: "Alice" };
   console.log(user!.name); // TypeScript won’t complain, but make sure user is not null

1. Enable Strict Null Checks: TypeScript’s strictNullChecks setting helps make sure you handle null and undefined cases. When this option is on, TypeScript won’t let you use variables that might be null or undefined without checking them first, which helps catch errors early.

To turn on strict null checks, you can add "strictNullChecks": true to your tsconfig.json file. This way, TypeScript will require you to handle null and undefined properly, making your code safer.

Handling null and undefined values properly helps you avoid bugs and keeps your code from breaking when it encounters empty values. Using optional chaining, non-null assertions, and strict null checks can make your TypeScript code more reliable and easier to work with.

Mistake #5: Incorrect Use of Type Annotations

What Are Type Annotations?

Type annotations are when you tell TypeScript what type a variable, function, or parameter should have. For example, if you know a variable will always be a number, you can write:

let age: number = 25;

This makes it clear that age is a number. TypeScript uses this information to catch mistakes if you try to use age as a different type, like a string.

Common Mistakes with Type Annotations

Sometimes, people make mistakes with type annotations, such as:

1. Assigning the Wrong Type: For example, saying something is a string when it’s actually a number. This can lead to errors and confusion.

   let score: string = 100; // Error: 100 is a number, not a string

1. Over-Annotating: This is when you add type annotations everywhere, even when TypeScript already knows the type. TypeScript is smart enough to figure out types on its own in many cases, so extra annotations aren’t always needed. Adding too many type annotations can make your code look cluttered and harder to read.

   // Over-annotating
   let name: string = "Alice"; // TypeScript already knows this is a string

Why Overusing Type Annotations Can Be Confusing

When you overuse annotations, it can make your code look repetitive and confusing. TypeScript automatically “infers” (figures out) the type of variables based on their values. So, you don’t need to write out the type every time if TypeScript can guess it correctly.

For example, this code:

let isComplete = true; // TypeScript knows this is a boolean, so no need to write : boolean

TypeScript already understands that isComplete is a boolean, so adding : boolean isn’t necessary.

How to Avoid Incorrect Use of Type Annotations

1. Let TypeScript Infer Types When Possible: If you’re assigning a value directly to a variable, you can skip the type annotation. TypeScript will automatically detect the type based on the value.

   let count = 10; // TypeScript knows count is a number

1. Use Annotations Only When Needed: Add type annotations when TypeScript can’t infer the type on its own, such as for function parameters or complex objects.

   function greet(name: string) {
       console.log(`Hello, ${name}`);
   }

1. Check for Type Accuracy: If you do add type annotations, make sure they’re correct. Double-check that the type matches the actual values being used to avoid mismatches, like calling something a string when it’s really a number.

Letting TypeScript handle types where it can, and adding clear annotations only where necessary, will make your code cleaner, easier to read, and less prone to errors. This keeps your TypeScript code simple and easy to understand!

Mistake #6: Forgetting About Structural Typing

What Is Structural Typing?

TypeScript uses something called structural typing. This means that TypeScript cares about the shape or structure of an object to decide if it’s compatible with a certain type, rather than focusing on what the type is called.

In other words, if two objects have the same properties and types, TypeScript will consider them the same—even if they have different names.

For example:

type Point = { x: number; y: number };
let coordinate: Point = { x: 5, y: 10 };

let anotherCoordinate = { x: 5, y: 10 };
coordinate = anotherCoordinate; // No error, even though anotherCoordinate is not explicitly of type Point

Here, coordinate and anotherCoordinate have the same structure, so TypeScript sees them as compatible. TypeScript doesn’t care if anotherCoordinate is not called Point; it only checks if it has x and y properties with number types.

Common Mistakes with Structural Typing

A common mistake is to assume TypeScript uses nominal typing (types based on names). In nominal typing, two things have to be the exact same type by name to be compatible. But in TypeScript’s structural system, if the shape matches, TypeScript treats them as the same type.

For example, developers might think that only objects of type Point can be assigned to coordinate. However, TypeScript allows any object that has the same structure, regardless of its type name. This can be confusing if you’re new to structural typing, as it allows objects with matching shapes from different parts of the code to be considered the same type.

How to Avoid Mistakes with Structural Typing

1. Understand the Shape-Based Approach: Remember that TypeScript cares more about the structure (properties and types) than about the names. Focus on the properties an object has, rather than its type name.

2. Be Careful with Extra Properties: If you add extra properties to an object, it may still match the expected type in some cases. To avoid confusion, make sure that objects only have the properties they need for a given type.

3. Use Interfaces and Type Aliases to Enforce Structure: Even though TypeScript is flexible with structural typing, creating interfaces or type aliases can help define clear structures and communicate intended shapes to other developers. This practice keeps your code more understandable.
   

   interface Point {
       x: number;
       y: number;
   }

1. Rely on Type Checking When Needed: TypeScript’s structural typing is very powerful for flexibility, but it’s still important to be aware of how objects with matching structures interact. If you want to be more strict, you can use classes or techniques that ensure each type is unique.

TypeScript’s structural typing system offers flexibility, but it’s important to understand how it works to avoid surprises. By focusing on the shape of types and using interfaces or type aliases, you can make the most of this system while keeping your code clear and reliable.

Mistake #7: Incorrectly Defining Object Shapes

Why Defining Object Shapes Matters

In TypeScript, when you create an object, you should define what properties it has and what types each property should be. This is called defining the shape of the object. When the shape isn’t defined properly, it can lead to runtime errors—errors that happen when you run your code.

For example, if you say an object should have a name and age, but you forget to add age, TypeScript might let it slide in certain cases, but your code could break later when you try to use age.

Real-World Example

Suppose you’re defining a User object that should have a name and age:

type User = { name: string; age: number };

Now, if you create a User but forget to add age, you might run into trouble:

let user: User = { name: "Alice" }; // Error: age is missing

This is a simple mistake, but it can cause problems if you expect age to always be there. If you don’t define object shapes correctly, you might accidentally skip important properties, leading to errors when you try to access those properties.

How to Avoid This Mistake

1. Use Interfaces and Type Aliases: Define the structure of your objects clearly with interfaces or type aliases in TypeScript. This makes sure all required fields are in place whenever you create an object.

   interface User {
       name: string;
       age: number;
   }

1. Use Optional Properties When Needed: If a property isn’t always required, you can mark it as optional using a ?. This way, TypeScript won’t complain if you leave it out, but it’ll still check for other required fields.

   interface User {
       name: string;
       age?: number; // Optional property
   }

1. Leverage Utility Types: TypeScript has built-in utility types like Partial to help with flexible shapes. For example, if you’re only updating part of an object, you can use Partial<User> to allow leaving out properties.

   function updateUser(user: Partial<User>) {
       // Only some properties of User are required
   }

1. Double-Check Required Properties: Always check that your objects have all necessary fields when you define or use them. Missing required properties can cause issues, so it’s a good habit to verify that your objects match the defined shape.

By carefully defining object shapes, you ensure that each object has the required fields, making your code more reliable and reducing the risk of errors. Using TypeScript’s tools like interfaces, optional properties, and utility types can help you define shapes accurately and make your code easier to maintain.

Mistake #8: Overusing Enums

What Are Enums?

In TypeScript, enums are a way to define a set of named values. They allow you to group related values together under a single name. For example:

enum Status {
   Active = "active",
   Inactive = "inactive",
   Pending = "pending"
}

Enums are helpful when you need to represent a limited set of values, such as the status of a task. But sometimes, overusing enums can make your code more complicated than it needs to be.

Why Overusing Enums Can Be Problematic

1. Makes Code Harder to Read: When you use enums, you need to remember the names of the enum values, which can add unnecessary complexity. For example:

   let status = Status.Active;

While this looks fine, if you use enums everywhere, your code can become harder to understand quickly, especially for developers who aren’t familiar with the enum definitions.

1. Increases Code Maintenance: When you use enums all over your code, updating or changing the values later can be more challenging. You might need to search and update the enum in many places, leading to extra work.

2. Unnecessary Abstraction: Sometimes, enums add a level of abstraction that isn’t needed. For example, simple strings or numbers can do the job just as well without the need for an enum.

How to Avoid Overusing Enums

1. Use Union Types Instead: If you only need a small set of values, consider using union types instead of enums. Union types are simpler and easier to maintain.

   type Status = "active" | "inactive" | "pending";
   let status: Status = "active";

Here, Status is just a set of possible values. It’s simpler than an enum and still provides type safety.

1. Use String Literals for Simple Cases: If your values are simple strings, just use string literals instead of enums. For example:

   let status: "active" | "inactive" | "pending" = "active";

This keeps things simple and clear, without needing to create a whole enum.

1. Stick to Enums for Specific Cases: Enums are useful when you need to represent something more complex, like adding methods to your enum or when the values need to be more descriptive. For example, if you’re working with a set of status codes that need additional functionality, an enum might make sense. But for simple sets of values, it’s better to avoid them.

When to Use Enums

Enums are great for cases where:

• You need a named collection of related values that will be used in many places in your code.
• You need more functionality tied to the values (e.g., methods or computed properties).

But for simple sets of values, using union types or string literals is often a better, simpler solution.

By avoiding overuse of enums, your code becomes easier to read, maintain, and understand, making it cleaner and more efficient.

Mistake #9: Misunderstanding Generics

What Are Generics?

Generics in TypeScript are a way to create reusable code that can work with any type, while still maintaining type safety. They allow you to write functions, classes, or interfaces that can work with different types without losing the benefits of TypeScript's type checking.

For example:

function identity<T>(value: T): T {
   return value;
}

In this case, T is a placeholder for a type that will be determined when you call the function. You can pass any type (like string, number, etc.), and TypeScript will make sure that the types match.

Common Mistakes with Generics

1. Incorrect Type Constraints: Sometimes, developers try to add constraints to generics but get them wrong. For example, you might try to use a constraint that’s too restrictive or doesn’t make sense for the function or class you’re working with.

   function getLength<T extends string>(value: T): number {
      return value.length;
   }

Here, T is constrained to be a string, which makes sense for the length property. But if you used an unnecessary or incorrect constraint, the function could break for other types.

1. Overcomplicating Code: Using generics incorrectly or unnecessarily can make your code more complex than it needs to be. For example, you might create a generic type or function where a simpler solution would work just as well.

   function combine<T, U>(value1: T, value2: U): T | U {
      return value1;
   }

This function doesn’t need to be generic because you’re just combining two values of any type. You could simplify this without using generics.

How to Avoid Misunderstanding Generics

1. Use Generics Only When Necessary: You don’t always need generics. If the code doesn’t need to work with different types, it’s better to just use a specific type. Generics are powerful but should only be used when they add value.

2. Understand Type Constraints: When you do use generics, make sure that the constraints make sense. Only limit the types that need to be restricted. For example, if you’re working with arrays, use T[] or Array<T> as the constraint.
   

   function getFirstElement<T>(array: T[]): T {
      return array[0];
   }

1. Simplify Where Possible: Don’t overcomplicate code with unnecessary generics. If a simple type (like string or number) works fine, don’t try to generalize it with generics. Use generics when you want to make a function or class flexible with different types.

2. Use Default Generics: If you want to make generics easier to use, you can assign a default type in case the user doesn’t provide one.
   

   function wrap<T = string>(value: T): T {
      return value;
   }

Here, if the user doesn’t specify a type, T will default to string.

Key Takeaways

• Generics are great for reusable, flexible code, but they can be confusing if not used correctly.
• Be mindful of type constraints—don’t restrict types too much or incorrectly.
• Use generics only when they add value to your code. Simple types are often enough.

By understanding how generics work and when to use them, you can avoid common mistakes and make your code more flexible, readable, and maintainable.

Mistake #10: Ignoring TypeScript Configuration Options

What Are TypeScript Configuration Options?

TypeScript has a configuration file called tsconfig.json where you can set various options to customize how TypeScript compiles your code. This configuration allows you to enforce stricter rules and catch potential errors earlier, before they cause problems in your code.

Why Ignoring Configuration Can Be Problematic

If you don't pay attention to the TypeScript configuration, it might not catch certain errors or issues that could lead to bugs or problems in your code. For example, TypeScript might allow you to write code that would normally be flagged as incorrect if the right settings were enabled.

By ignoring these settings, you may miss important warnings and make your code less safe.

Key TypeScript Configuration Options to Be Aware Of

1. strict: This is a special setting that turns on several important strict checks at once. It helps ensure that your code is type-safe and doesn’t rely on any type of loose or weak typing.

Why it’s important: When strict is enabled, TypeScript checks for things like uninitialized variables, null checks, and more. This helps you catch potential issues early.

   {
      "compilerOptions": {
         "strict": true
      }
   }

1. noImplicitAny: This setting prevents TypeScript from allowing variables, parameters, or return values to be typed as any unless explicitly declared. any allows any value to be assigned, which bypasses TypeScript’s type-checking system.

Why it’s important: With noImplicitAny, TypeScript forces you to specify a type, preventing you from accidentally using any and missing potential bugs that type checking would otherwise catch.

   {
      "compilerOptions": {
         "noImplicitAny": true
      }
   }

1. strictNullChecks: When enabled, this setting ensures that null and undefined are not treated as valid values for any type unless explicitly specified. It helps prevent bugs that might arise from accidentally trying to use null or undefined.

Why it’s important: Without this setting, TypeScript will allow null and undefined to be assigned to any variable, which can lead to runtime errors.

   {
      "compilerOptions": {
         "strictNullChecks": true
      }
   }

How to Avoid This Mistake

1. Enable Strict Mode: Always enable the strict flag in your tsconfig.json. This will automatically turn on several useful settings, including noImplicitAny and strictNullChecks. It’s one of the best ways to ensure your code is as safe and error-free as possible.

2. Review and Customize Settings: Take a moment to review the full list of TypeScript compiler options. Customize them to fit the needs of your project. You can enable or disable certain checks to make your code more reliable and maintainable.

3. Always Enable noImplicitAny: Avoid the any type unless absolutely necessary. By enabling noImplicitAny, you’ll be forced to think about the types of your variables, which will make your code safer.

4. Use strictNullChecks to Catch Null Errors: Null values can easily cause bugs if not handled carefully. By enabling strictNullChecks, you ensure that null or undefined don’t slip into places where they can cause issues.

Key Takeaways

• TypeScript’s compiler options are powerful tools that help you catch errors before they happen.
• Always enable strict mode to ensure you’re getting the most out of TypeScript’s type system.
• Use the noImplicitAny and strictNullChecks options to catch bugs related to untyped variables and null values.

By properly configuring TypeScript’s settings, you can avoid common pitfalls and make your code more reliable, easier to maintain, and less prone to bugs.

Conclusion

TypeScript is a powerful tool that can help developers write safer and more reliable code, but it's easy to make mistakes when you're just starting out. We've covered the most common TypeScript pitfalls, such as misusing type assertions, overusing any, ignoring nullability, and misunderstanding generics. These mistakes can lead to unexpected bugs and harder-to-maintain code.

Here’s a quick checklist to avoid these mistakes:

• Don’t misuse type assertions: Only use them when you're certain about the type.
• Avoid using any too much: Try using unknown or more specific types instead.
• Understand the difference between any and unknown: unknown is safer and forces you to check types before using them.
• Handle null and undefined properly: Use optional chaining, non-null assertions, and enable strict null checks.
• Don’t overuse enums: Use union types or string literals instead, where possible.
• Use generics correctly: Don’t overcomplicate things, and understand how to apply them the right way.
• Configure TypeScript correctly: Enable strict settings to catch issues early.

By understanding these common mistakes and following the best practices outlined in this article, you’ll be able to write cleaner, safer, and more maintainable TypeScript code.

Embrace TypeScript’s features, and let it help you write more reliable applications with fewer bugs. Keep learning, and happy coding!

This content originally appeared on DEV Community and was authored by Talha Ahsan

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rf:citation

» TypeScript Traps: Top 10 Mistakes Developers Make and How to Dodge Them | Talha Ahsan | Sciencx | https://www.scien.cx/2024/11/07/typescript-traps-top-10-mistakes-developers-make-and-how-to-dodge-them/ |

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