js extension is an ES module or CommonJS module, Node invented the package.json type property and conventions. To resolve the problem of whether a file with a. The problem with the package.json type property Consequently, you are writing config and mapping routines or writing custom scripts to manage these files. Your favorite bundler may also not understand these files. mjs extension defined as an ‘application/json’ mime type. cjs file and vice-versa.įurther, most tool chains do not yet properly support.
ESM FILR CONVERT CODE
mjs that code requires patching to be able to require from a.
ESM FILR CONVERT PATCH
cjs implies that you either don’t have a single code base or you are using or creating custom tooling to copy the source and change the extensions and then patch your source code to use the appropriate extensions in import statements.ĮSM code requires that import directives specify the path to the imported file.
However, if you are building a hybrid module, then using. This works for simple, stand-alone, non-hybrid use cases. Extensions typically are used to describe a file type. Node adopted these source code file extensions to indicate the type of source file. cjs extensions to indicate ESM or CommonJS code? mjsīefore outlining the solution, let me put a sword in a few much touted techniques. But it works for all of mine, including consumption by Webpack, the serverless framework, ESM command line tools, and other ESM or CommonJS libraries. I don’t vouch that this will work in all use cases. It supports a single source code base and creates a module that can be consumed by CommonJS and ESM apps and modules. I’ve tried so many approaches, only to find they fail in one or more use cases.įinally, I found a solution that is easy, works well and generates efficient ESM code. I’ve tried the package.json type field, but it failed when used in combination with the package.json exports map (more below). I’ve tried using bundlers: Webpack and Rollup. cjs extensions which fail with more than a few essential build tools. What a god damn mess!! Creating a Hybrid Module should not be this difficult! You read about the package.json type = "module" and exports keywords which will magically make everything work, but they don’t work as advertised. cjs extensions are the solution and the future, but it seems that most developers hate them. When reading Node documentation, you read about Webpack and Rollup, ESM, CommonJS, UMD and AMD. And most do not generate efficient, pure ESM code. Most solutions require either Webpack, Rollup, custom scripting and build tools or creating and maintaining a dual source base. These point to various competing strategies, which when tried, work in some situations but are brittle and fail in other situations. On this topic, there are countless blog articles, stack overflow questions and reference pages.
Sometimes called a “hybrid” package, easily creating an NPM module that is simply consumed using import or require is an elusive goal. That has been a vexing question for a while.Ĭreating an NPM module from single code base that easily targets both CommonJS and ES modules can be an exercise in frustration. Preferably without using creating two source bases and without needing Webpack? How can you easily create an NPM module for ESM and CommonJS?
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