How to solve the compatibility problem between JavaScript naming specification and Android WebView?

JavaScript Naming Compatibility Challenge with Android WebView

This article discusses the compatibility issues of JavaScript code naming specifications and Android WebView. Standard JavaScript naming rules stipulate that variables and function names are composed of letters, numbers, underscores and dollar signs, and cannot start with numbers. However, some libraries or frameworks may use non-standard naming, such as function names starting with a pound sign (#).

Recently, when I was using npm's pdfjs-dist (2.14) package, I encountered a problem: the code runs normally in the Chrome browser, but there was a syntax error (unexpected token) in the Android WebView. After troubleshooting, the error originated from the function name in the pdf.js file that starts with a pound sign.

Preliminary investigations show that the function name at the beginning of the pound sign may indicate a private method, but there is a lack of conclusive evidence to support it. To solve this problem, the author considers directly modifying pdfjs-dist package under node_modules and renaming these function names. However, it is not best practice to modify the dependency package directly.

Ultimately, another approach is adopted: configure the target browser version through the .browserslistrc file to ensure the code is compatible with newer versions of Android and Chrome Android. The specific configuration is as follows:

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

It should be noted that the version number rules of Android WebView and Chrome Android are different. In addition, since pdfjs-dist is a dependent package, Babel will not process its code by default, so you need to configure the transpileDependencies property in vue.config.js and use the include option in babel.config.js to specify the code path to be processed:

 // babel.config.js
include: [path.resolve('src'), path.resolve('node_modules/pdfjs-dist')],

This configuration ensures that Babel handles code in the src directory and node_modules/pdfjs-dist directory, thus solving the compatibility issues of Android WebView.

However, after solving the problem of pound function name, a new problem arose: the PDF file displays normally in the browser, but there is an error in the Android WebView. This issue requires further debugging and optimization.

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