How to solve the compatibility issue of pound sign (#) function names in Android WebView in JavaScript?

Compatibility of Android WebView and JavaScript pound mark (#) function names: Problem and solution

During development, JavaScript naming specifications usually recommend using letters, numbers, underscores and dollar signs, avoiding starting with numbers. However, third-party libraries or frameworks may contain special naming, such as function names starting with pound signs (#), which may cause compatibility issues in Android WebView. This article will use pdfjs-dist as an example to explain how to solve such problems.

Problem description

When using pdfjs-dist, the Chrome browser runs fine, but there is a syntax error of "unexpected token" in Android WebView. The reason is that pdfjs-dist contains function names starting with a pound sign (#), and some Android WebView versions do not support such naming.

The meaning of the function name of the pound sign (#)

There is currently no clear evidence that the function name at the beginning of the pound sign (#) represents a private method. Its function and meaning need to be judged based on the documentation of the specific library.

Solution

Directly modifying pdfjs-dist package under node_modules is not the best solution, and may lead to other problems. A more recommended solution is to use configuration to handle compatibility:

1. Create .browserslistrc file: Create .browserslistrc file in the project root directory and add the following configuration. Note that the Android WebView version is different from the Chrome Android version rules:

 <code>android >= 4 chromeandroid >= 83 last 2 versions</code>

2. Configure vue.config.js (or other build tool configuration): Since Babel does not handle dependency package code by default, you need to configure transpileDependencies in vue.config.js (or similar configuration file):

 // vue.config.js
module.exports = {
  transpileDependencies: ['pdfjs-dist']
}

3. Configure babel.config.js (optional): More precise control, you can use the include option in babel.config.js to ensure that Babel handles src directory and pdfjs-dist :

 // babel.config.js
const path = require('path');
module.exports = {
  // ... other configurations ...
  include: [path.resolve('src'), path.resolve('node_modules/pdfjs-dist')],
}

Through the above configuration, Babel will handle the code in pdfjs-dist to solve the compatibility issues caused by the pound sign (#) function name.

Other compatibility issues

After solving the pound mark (#) problem, you may encounter other compatibility issues, such as display misalignment, etc. This requires further debugging and optimization to ensure cross-platform compatibility.

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