Unchecked Runtime.lastError

Chrome throws Unchecked runtime.lastError: The message port closed before a response was received when either there is a conflict with an extension or some of the onMessage listeners in your created extension is expected to return a promise.

#react 

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Unchecked Runtime.lastError
Sigrid  Farrell

Sigrid Farrell

1623729900

Customizing CORS Filtering at Runtime

Let’s make CORS work for you.

Cross-origin resource sharing (CORS) is a mechanism that controls the AJAX calls to your resources outside the current origin. In some cases, you need to allow some origins to make these kinds of calls. For example, if you have a SAAS based product, there will be some clients who are connecting to your API and making AJAX calls.

In Spring, there are several ways to check the origin, method, headers, etc., of incoming requests.

You can use WebSecurityConfigurerAdapter in Spring Security, and WebMvcConfigurer@CrossOrigin annotation, CorsFilter in Spring MVC.

We are providing a SaaS-based payment and wallet application. We’re serving our payment page via JavaScript, and so many CORS requests come from our clients. In our case, we needed to change allowed origins dynamically because some merchants may be added, deleted, or updated.

Our tech stack in this project consists of Spring Boot, Spring Cloud, Netflix OSS, and our gateway is Netflix Zuul.

#java #tutorial #spring #runtime #cors #customizing cors filtering at runtime

Unchecked Runtime.lastError

Chrome throws Unchecked runtime.lastError: The message port closed before a response was received when either there is a conflict with an extension or some of the onMessage listeners in your created extension is expected to return a promise.

#react 

Zena  Sporer

Zena Sporer

1599170880

Compiling Kotlin in Runtime

Everybody knows tasks, which could be easily solved if you can generate and execute code instantly inside JVM runtime. However, sometimes you have to create separate library, so code isn’t known during its compile time.

Here we observe an approach to generate code and execute it after the application start. We will use jsr233 standard for this.

As task we use popular approach - we create AOP system to parse SQL query response, to parse the result table. So developer is able to add annotations into the code and then our application will generate and execute the parser code in the runtime. However, this approach is much wider. You can create programmable configuration (like TeamCity Build DSL), you can optimize the existing code (the generated code can be constructed after settings reading, so it will be branch-free). And of course we can use this approach to avoid copy-paste in case when the language expressive power isn’t enough to extract the generalized block.

#spring #kotlin #jdbc #dsl #compiler #runtime

Dexter  Goodwin

Dexter Goodwin

1624945140

How to Get Runtime Type Checking in TypeScript

You wanna get runtime type checking in TypeScript but you do not know where to get started? So, this is the right article for you 🤩.

Prerequisites

  • Have standard TypeScript understanding
  • Have IDE installed to code. eg: Visual Studio CodeSublime Text, …etc

Problem definition

Suppose that you have types as below:

interface Product {
  id: number;
  name: string;
  quantity: number;
  type: 'FURNITURE' | 'BOOK'
}

type Products = Product[];

types.ts

#iot #runtime #javascript #typescript

Armando  Bruen

Armando Bruen

1596568800

Meet Deno: The New JavaScript/TypeScript Runtime

Deno is Ryan Dahl’s (yeah, you guessed it right, the guy who created Node.js) latest venture.

But it isn’t just another JavaScript Engine. It also supports TypeScript — JavaScript’s strictly typed cousin — out of the box.

Installing Deno

On macOS, you can install Deno using Homebrew — the open-source software package manager for macOS:

brew install deno

Here’s a GIF to give you a better idea:

The output of the “brew install deno” command. Image Credits: Pratik Chaudhari (Author)

The output of the “brew install deno” command. Image Credits: Pratik Chaudhari (Author)

On Windows, Chocolately serves an alternative to macOS’s Homebrew:

choco install deno

On Linux, good ol’ curl will do the job:

curl -fsSL https://deno.land/x/install/install.sh | sh

Once Deno is installed, one can run the following command to see all the command-line options that are available:

deno --help

The output of the above command will look something like below:

The output of executing the “deno” command on Terminal. Image Credits: Pratik Chaudhari (Author)

The output of executing the “deno” command on Terminal. Image Credits: Pratik Chaudhari (Author)

#deno #nodejs #typescript #runtime #javascript #programming