Could you provide instructions on how to change mjs files into js format?

Is there a method to change .mjs files to .js files? Some hosting services do not yet support mjs files, so I am interested in converting them to js files.

Context: Mozilla's PDFjs has incorporated JavaScript modules (mjs) into their code, but since I am integrating PDFjs into a WordPress plugin that can be installed by anyone, it poses a challenge as most hosting providers do not support mjs files. It is not feasible to expect thousands of users to update their hosting just to accommodate .mjs files.

Answer №1

According to MDN, it is recommended to use the .js file extension instead of .mjs for JavaScript modules. This will ensure the correct mime type is used while still maintaining functionality. However, this choice may go against conventions in order to achieve better compatibility.

Source: "JavaScript modules" via MDN

Point of Interest - .mjs vs. .jsMDN

Despite the option to use .mjs, MDN recommends sticking with .js for now. For proper module functionality in browsers, it is crucial that servers serve them with the correct Content-Type header specifying a JavaScript MIME type like text/javascript. Failure to do so may result in a strict MIME type checking error, leading to JavaScript not running in the browser. While many servers already handle .js files correctly, the same cannot be said for .mjs files. Some servers that do support .mjs files include GitHub Pages and http-server for Node.js.

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