ERA TECH - The ERA of Technology

If you’re trying to use the ts-node command and are encountering the error “ ts-node is not recognized as an internal or external command, operable program, or batch file ,” there are a few solutions you can try. Solution 1: Use npx The quickest solution is to use the npx command. Simply prefix your ts-node command with npx, like so: npx ts-node myScript.ts You can also check the version of ts-node you have installed with npx: npx ts-node --version Solution 2: Install ts-node Globally or as a Development Dependency Another option is to install ts-node globally or as a development dependency for your project. To install ts-node globally, run the following command: npm install -g ts-node To install ts-node as a development dependency for your project, run this command from the root directory of your project: npm install --save-dev ts-node Installing ts-node locally for your project has the added benefit of allowing you to control and share the versions through your package.json file....

If you’re seeing the error “ System limit for number of file watchers reached ” on your Android phone, it means that the system has reached its limit for the number of files being watched. This can happen when using packages like Jest , React.js , Angular , or Webpack that tend to watch a lot of files. To fix the error, you’ll need to increase the limit of inotify watchers on your Android phone. One solution is to use the command “ fs.inotify.max_user_watches=524288 ” to increase the number of inotify watchers on your system. However, these changes won’t be persisted after a reboot unless you write the new number of watchers to a file. You can do this by running the following command: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p Alternatively, you can try increasing the number of inotify watchers by modifying the “ sysctl.conf ” file directly. To do this, open the file in a text editor and add the following line at the end: fs.inotify...

One common task when working with dates in JavaScript is adding a certain number of weeks to a given date. In this post, we’ll explore a couple of ways to do this in a quick and efficient manner. Method 1: Reusable Function One way to add weeks to a date is to create a reusable function that takes the number of weeks and a Date object as arguments. If no Date object is provided, the function uses the current date by default. Here’s an example of how this function might look: function addWeeks(numOfWeeks, date = new Date()) { date.setDate(date.getDate() + numOfWeeks * 7); return date;} To use this function, simply call it with the number of weeks you want to add and an optional date object. For example: // Add 2 weeks to current dateconsole.log(addWeeks(2));// Add 2 weeks to specified dateconsole.log(addWeeks(2, new Date('2022-02-14'))); The getDate() method returns the day of the month for the given date as an integer between 1 and 31 . The setDate() method sets the day of...

Understanding the error “Property does not exist on type ‘never'” c This error can be frustrating and confusing, but it is relatively easy to solve once we understand the cause. Causes of the error “Property does not exist on type ‘never'” One common cause of the error is when we try to access a property on a null or undefined value. For example, consider the following code: type Employee = { salary: number;};let employee: Employee | null = null;function setEmployee() { employee = { salary: 100 };}setEmployee();// employee.salary is equal to 100 here// but TypeScript doesn't knowif (employee == null) { console.log('employee is nullish');} else { // Error: Property 'salary' does not // exist on type 'never'.ts(2339) console.log(employee.salary);} Another cause of the error is declaring an empty array without assigning a type to it. const obj = { years: [],};// never[]console.log(obj.years); Solutions Property does not exist on type ‘never’: To ...

In this article, we will explore different methods to check if a string in JavaScript contains spaces. Using the RegExp.test() Method One way to check if a string contains spaces is to use the test() method of the RegExp object. The test() method will return true if the string contains at least one whitespace character and false otherwise. function containsWhitespace(str) { return /\s/.test(str);}console.log(containsWhitespace(' ')); // 👉️ trueconsole.log(containsWhitespace('free to reads com')); // 👉️ trueconsole.log(containsWhitespace('')); // 👉️ falseconsole.log(containsWhitespace('test')); // 👉️ false The regular expression /\s/ checks for all types of whitespace characters, including spaces, tabs, and newline characters. The \s character is used to match spaces, tabs, and newlines. function containsWhitespace(str) { return /\s/.test(str);}console.log(containsWhitespace('hello\tworld')); // 👉️ trueconsole.log(containsWhitespace('...

When working with functions and classes in Python, you may encounter the “ TypeError: got multiple values for argument ” error. This error occurs when you pass the same argument multiple times in a function call, either by using both a positional and a keyword argument or by passing self as a variable in a class method. In this post, we will explore different ways to solve this error and prevent it from happening in the future. Understanding the error TypeError: got multiple values for argument in Python The “ TypeError: got multiple values for argument ” error occurs when you pass the same argument multiple times in a function call. This can happen in two ways: When passing a positional and a keyword argument for the same variable. def get_employee(name, **kwargs): return {'name': name, **kwargs}result = get_employee('Alice', name='Alice')print(result) In the example above, we pass the name argument as both a positional and a keyword argument, which causes t...

The “ Component cannot be used as a JSX component ” error is a common issue that developers encounter when working with React. In this article, we’ll explore the causes of this error and provide solutions for resolving it. Causes of the error “Component cannot be used as a JSX component in React” There are several reasons why this error may occur: Returning an array of JSX elements instead of a single element. Returning any value other than a JSX element or null from a component. Forgetting to return a value from a component. Having outdated version of React typings. Using an undefined component as a JSX component. Using a non-JSX compatible component such as ‘intl-tel-input’ or ‘victoryaxis’ in React. Solution 1: Wrapping the Array with a React Fragment or Div Element One of the most common causes of the “ Component cannot be used as a JSX component ” error is returning an array of JSX elements instead of a single element. To solve this, we can wrap the array using a React fragment or...

Are you encountering the error “‘vue-cli-service’ is not recognized as an internal or external command, operable program or batch file”? This error can be frustrating, but don’t worry, there are several solutions you can try to fix it. In this blog post, we’ll go through the steps to troubleshoot and resolve the error. Solution 1: Install the @vue/cli-service Package Globally The first solution is to install the @vue/cli-service package globally by running the following command in your terminal: npm install -g @vue/cli-service After installing the package, you should clear your npm cache by running the following command: npm cache clean --force Next, navigate to your project’s root directory (where your package.json file is located) and run the following command: npm install Finally, run the following command to serve your project: npm run serve Solution 2: Delete node_modules and Reinstall Dependencies If the error persists after trying solution 1, try deleting your node_modules and p...

“Functions are not valid as a React child” error is a common issue that developers encounter when working with React. This error occurs for two main reasons: returning a function reference and not a component from render, and using React Router routes incorrectly. Reason 1: Returning a function instead of JSX One of the main causes of this error is when developers return a function reference and not a component from render. Here’s a simple example of how this error occurs: App.js/** * Functions are not valid as a React child. */const App = () => { const getButton = () => { return <button>Click</button>; }; // returning function and not JSX element from render return <div>{getButton}</div>;};export default App; Solution 1: Call the function To solve this error, you can call the function instead of returning the function reference. App.jsconst App = () => { const getButton = () => { return <button>Click</button>; }; // now retu...

The Python “UnicodeDecodeError: ‘utf-8’ codec can’t decode byte in position: invalid continuation byte” occurs when we try to decode a bytes object using an incorrect encoding. To solve this error, we need to specify the correct encoding when decoding the bytes object. For example, the following code will raise the UnicodeDecodeError: my_bytes = 'one é two'.encode('latin-1')my_str = my_bytes.decode('utf-8') # UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 4: invalid continuation byte How to Fix UnicodeDecodeError: ‘utf-8’ codec can’t decode byte in position: invalid continuation byte This error occurs because the string “one é two” was encoded using the ‘latin-1’ encoding, but we are trying to decode it using ‘utf-8’ encoding. To fix this, we need to use the ‘latin-1’ encoding when decoding the bytes object: my_bytes = 'one é two'.encode('latin-1')my_str = my_bytes.decode('latin-1') # "one é two...

The error “Object is possibly ‘null'” occurs when we try to access a property on an object that may have a value of null. This error can occur when working with TypeScript, especially when trying to access properties of an object that could be null or undefined. In this blog post, we will go over several solutions to this error, including using the optional chaining operator, type guards, non-null assertions, and the logical AND operator. Using the optional chaining operator One solution to the “Object is possibly ‘null'” error is to use the optional chaining operator. The optional chaining operator (?.) is a way to access a nested property of an object, but instead of causing an error if the reference is nullish (null or undefined), it short-circuits returning undefined. Here is an example of how the error occurs: type Employee = { address: { country: string; city: string; } | null;};const emp: Employee = { address: null,};console.log(emp.address.country); The address...

When working with TypeScript, you may encounter the error “Parameter ‘X’ implicitly has an ‘any’ type” when a function’s parameter has an implicit type of any. This error can be caused by a lack of explicit type annotations on function parameters, arrow functions, callbacks, etc. In this blog post, we’ll explore several ways to fix this error and make your TypeScript code more robust. Understanding the Implicit “any” Type The implicit “any” type in TypeScript occurs when the type of a value can’t be inferred and no type annotations are present. When this happens, TypeScript assigns the type any to that value. This can lead to unexpected runtime errors if the value is used in a way that doesn’t match its inferred type. Explicitly Setting the Type to “any” One way to fix the “Parameter ‘X’ implicitly has an ‘any’ type” error is to explicitly set the type of the parameter to any. Here’s an example of how to do this: function sum(a: any, b: any) { return a + b;}console.log(sum(10, 50)); /...

Introduction: TypeError: Object of type function is not JSON serializable The Python “ TypeError: Object of type function is not JSON serializable ” occurs when we try to serialize a function to JSON. This error can be caused by a number of reasons, but the most common cause is when we forget to call the function before passing it to the json.dumps() method. Understanding the Error “TypeError: Object of type function is not JSON serializable” Here is an example of how the error occurs: import jsondef get_employee(): return {'name': 'Alice', 'age': 30}json_str = json.dumps(get_employee) # forgot to call function We forgot to call the get_employee() function in the call to the json.dumps() method, which results in the TypeError: Object of type function is not JSON serializable . Solution: TypeError: Object of type function is not JSON serializable The solution to this error is quite simple, we just need to make sure to call the function and serialize the objec...

When working with TypeScript, you may encounter the error “Cannot invoke an object which is possibly ‘undefined'” when trying to invoke a function property that could be undefined, marked as optional. The error occurs because TypeScript wants to ensure that the property could not possibly have an undefined value, as trying to invoke undefined would cause a runtime error. In this article, we will explore several solutions to this error, including using the optional chaining operator (?.) and logical AND (&&) operator. Understanding the Error To better understand the error, let’s take a look at an example: type Employee = { doWork?: () => void;};const employee: Employee = {};// Error: Cannot invoke an object which// is possibly 'undefined'.ts(2722)employee.doWork(); In this example, we have defined an Employee type with an optional doWork function property. We then create an employee object, but do not assign the doWork property a value. When we try to invoke the ...

When trying to install packages using pip, you may encounter the error message “ Could not install packages due to an EnvironmentError: [Errno 13] Permission denied. ” This error message typically occurs when there is a permission issue with the directory where the packages are being installed. In this blog post, we will explore the causes of this error and provide solutions to fix it. The keywords to focus on in this post include: could not install packages, environmenterror, venv/bin/activate permission denied, permission denied os error 13, pip install permission denied windows. Causes of the Error There are several potential causes of the “ Could not install packages due to an EnvironmentError: [Errno 13] Permission denied ” error message. These include: Attempting to install packages to a directory that the user does not have write access to Attempting to install packages in a virtual environment (venv) where the activate script does not have execute permissions Attempting to inst...

Python is a versatile programming language that is widely used for a variety of purposes. One of the most commonly used modules in Python is the ‘ six ‘ module. However, sometimes when working with Python, you may encounter an error message that states “ ModuleNotFoundError: No module named ‘six’ “. This error can occur for multiple reasons and can be frustrating to deal with. In this blog post, we will explore the causes of this error and provide solutions on how to fix it. Causes of the Error: Not having the six package installed Installing the package in a different Python version than the one you’re using Installing the package globally and not in your virtual environment Your IDE running an incorrect version of Python Naming your module six.py which would shadow the official module Declaring a variable named six which would shadow the imported variable Solutions: Install the six package: The first step in solving this error is to install the six package. You can do this by running...

When working with text data in Python, it’s not uncommon to encounter the “ UnicodeDecodeError: ‘charmap’ codec can’t decode byte ” error. This error typically occurs when you’re trying to read or write a file that contains non-ASCII characters, but the system you’re using doesn’t support the character encoding used in the file. In this article, we’ll take a closer look at this error and explore some solutions for resolving it. Understanding the Error The “ UnicodeDecodeError: ‘charmap’ codec can’t decode byte ” error occurs when Python’s built-in codecs module is unable to decode a specific byte sequence. The codecs module is responsible for converting between different character encodings, such as UTF-8 and ASCII. The ‘charmap’ codec is a specific codec that’s used for encoding and decoding characters in the Windows-1252 character set. The error message itself is quite informative. It tells us that the ‘charmap’ codec is unable to decode a specific byte (in this case, 0x9d) at a spec...

When working with strings in Python, it’s common to need to replace spaces with underscores. This can be useful for filenames, URLs, or any other situation where spaces are not allowed. In this blog post, we will explore various ways to replace spaces with underscores in Python. Python provides several ways to replace spaces with underscores in strings. In this article, we will explore three different methods for achieving this task: using the replace() method, using the re.sub() method, and using the str.join() and str.split() methods. Method 1: Using the replace() Method The simplest way to replace spaces with underscores in a string is to use the replace() method. This method takes two arguments: the first is the substring that we want to replace, and the second is the replacement. Here’s an example: my_str = 'one two three'result = my_str.replace(' ', '_')print(result) # 'one_two_three' In this example, we call the replace() method on the string my_...

Have you ever come across an error message that says “ModuleNotFoundError: No module named ‘setuptools'”? This error occurs when the setuptools package is not installed in your Python environment. In this article, we will take a closer look at this error and provide you with several solutions to fix it. Understanding the Error The “ModuleNotFoundError: No module named ‘setuptools'” is a common error that occurs when you try to use a module (or package) that is not installed in your Python environment. In this case, the missing module is the setuptools package. Setuptools is a package that helps developers to package, distribute, and install Python programs. It is often used in conjunction with other packages such as pip, which is a package installer for Python. Solution 1 – Installing setuptools The first solution is to install the setuptools package. You can do this by running the following command in your terminal: python3 -m pip install --upgrade setuptools This command inst...

Are you seeing the error “ModuleNotFoundError: No module named ‘xgboost'” when trying to import the xgboost library in Python? This error occurs when the xgboost library is not installed or is installed in the wrong environment. In this article, we will go over some common causes of this error and provide solutions to fix it. Installation Issues One of the most common causes of the “ModuleNotFoundError: No module named ‘xgboost'” error is simply not having the xgboost package installed. To fix this, you can use the pip package manager to install xgboost. Open your terminal in your project’s root directory and run the following command: pip install xgboost If you are using Python 3, the command may need to be pip3 install xgboost. If you encounter a permissions error, you can try using sudo pip3 install xgboost or pip install xgboost –user. If pip is not in your PATH environment variable, you can try using python -m pip install xgboost or python3 -m pip install xgboost. If you a...

Pygame is a popular library in Python that is used for game development. However, it is not always straightforward to install and use. One common issue that users may encounter is the “ ModuleNotFoundError: No module named ‘pygame’ ” error. This error occurs when the Pygame library is not installed or is not properly configured on the user’s machine. In this article, we will discuss the causes of this error and the steps that can be taken to troubleshoot and fix it. Cause of the Error: The “ ModuleNotFoundError: No module named ‘pygame’ ” error is caused when the Pygame library is not installed or is not properly configured on the user’s machine. This error can occur if the user has not installed the Pygame library or if the library is not being imported correctly in the Python script. Another cause could be the version of python you are using and the version of pygame are not compatible. This could also cause the import error....