Differences between Vue3 and Vue2: Better error tracking

The difference between Vue3 and Vue2: better error tracking

With the release of Vue3, front-end developers have ushered in a new version. Compared with Vue2, Vue3 has a lot of performance and development experience. Big improvements, one of the most noteworthy improvements is better error tracking capabilities. In this article, we will explore Vue3’s improvements in error tracking and illustrate its differences with Vue2 through code examples.

In Vue2, when we have an error during the development process, we usually can only see an error message in the console, but this often does not provide enough contextual information, making it difficult for us to track it down. The specific error location and cause. Vue3 has optimized error tracking and provided more detailed error prompts and tracking information, allowing us to locate and solve problems faster.

First of all, Vue3 uses a new compiler that can generate more precise error prompts. When an error occurs in our code, Vue3 will give more accurate error information, including the cause and location of the error. For example, when we use undefined variables, Vue3 will give an error message similar to "ReferenceError: xxx is not defined" and mark the specific line number and file name where the error occurred.

Uncaught ReferenceError: xxx is not defined
    at eval (App.vue:9)
    at renderComponentRoot (runtime-core.esm-bundler.js:867)
    at componentEffect (runtime-core.esm-bundler.js:4341)
    at reactiveEffect (reactivity.esm-bundler.js:42)
    at effect (reactivity.esm-bundler.js:17)
    at setupRenderEffect (runtime-core.esm-bundler.js:4305)
    at mountComponentImpl (runtime-core.esm-bundler.js:4256)
    at processComponent (runtime-core.esm-bundler.js:4218)

We can see that in the error message, Vue3 marks the file name and line number where the error occurred. Through this information, we can quickly find the specific location where the error occurred and fix it.

In addition, Vue3 also introduces a new error handling mechanism. When we use the try-catch statement inside the life cycle function or component in Vue2 to capture errors, if the error occurs during asynchronous processing, it is often difficult for us to obtain specific error information. In Vue3, error handling is more flexible and convenient. Vue3 provides a global error catcher errorCaptured. We can get the error object and the component instance where the error is located in this function.

app.config.errorHandler = (err, vm, info) => {
  console.error('Error:', err)
  console.error('Component:', vm)
  console.error('Error info:', info)
}

Through the above code example, we can print out the error object, component instance and error-related information in the error handling function. This allows us to better understand the background and context of the error when dealing with it, allowing us to locate and solve the problem faster.

In addition to improvements in error prompts and error handling, Vue3 also provides more debugging and tracing tools. With the help of the Vue developer tool plug-in, we can visually view the details of the component tree, state changes, and event triggering in the browser. This visual debugging and tracing capability greatly improves development efficiency and debugging experience.

To sum up, Vue3 has made huge improvements in error tracking, which greatly improves the efficiency of developers when debugging and fixing errors. Through more accurate error prompts, flexible error handling mechanisms, and visual debugging and tracing tools, we can locate and solve problems faster and improve development efficiency. When developing with Vue3, we will better enjoy the convenience brought by these improvements.

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