As I start the exciting journey of creating a new app with Angular2 and Typescript, two technologies that I have never used together before (although I do have experience using them individually), a question arises in my mind. How can I effectively debug the client end of my application when Typescript compiler converts my code to JavaScript, leading to a large amount of machine-generated code that sometimes appears less human-readable?
Typescript is not only a transpiler but also capable of generating source maps for easier debugging. The output of Typescript closely resembles the source code itself, allowing you to easily debug the resulting JavaScript files.
However, when dealing with a large bundled JavaScript file and needing to debug individual TypeScript files, exporting source maps becomes essential.
Typescript provides several sourceMapping flags that can be utilized. Refer to https://www.typescriptlang.org/docs/handbook/compiler-options.html for more information.
All modern web browsers are equipped to load source maps and map breakpoints back to their respective source files.
You have the option to bundle the source map and sources within your .js file, although this will significantly increase the file size.
tsc --sourceMap --inlineSources --inlineSourceMaps
Alternatively, if your web server is capable of serving the .ts and .map files, you can configure it using:
tsc --sourceMap --sourceRoot <root of src>
The latter approach will result in additional sourceMappingUrl comment at the end of the js files, requiring the browser's devtools to search for the .map and source files.
One way to track messages and data in the browser console is by utilizing the regular logging methods, while also adding breakpoints within machine-generated JavaScript via the developer tools provided by your web browser. Although the generated code may not be exactly identical to your original Typescript code, it should still be distinguishable enough for you to identify which part of your code you are inspecting. I trust this information proves beneficial to you.
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