Resizing Image for Frontend with Python

We can optimise the load time by using different image sizes for different screen widths. There is no point in loading a huge image for a mobile when the width is only for 200px. Here is the quick Python script to resize images. By changing the array, you can output as many dimensions as you want.

It will work for both square and rectangle images. For rectangle images, it will keep the width: height ratio. We can pass multiple image files with multiple target widths.

That’s it. Pretty cool!

Front-End
TypeScript: type aliases to check type equality

This post is to analyse how the type equality check by using type aliases proposed by Matt Pocock in his twitter post. These type aliases allow us to elegantly express type equality checks in unit tests. All we need to do is to pass the output and expected types in …

Front-End
Fixing it.only type error in Jest

If you are getting a type error with it.only in Jest, it could be due to incorrect TypeScript typings or incompatible versions of Jest and TypeScript. To resolve this issue, you can try the following steps: Make sure you have the latest versions of Jest and its TypeScript typings installed …

Front-End
yup conditional validation example

Here’s an example of a Yup validation logic where the first input field is optional but, if filled, it must contain only alphabetic characters, and the second input field is required: import * as Yup from “yup”; const validationSchema = Yup.object().shape({ firstField: Yup.string().matches(/^[A-Za-z]*$/, { message: “First field must contain only …