r17x/raw.macro

Read file contents at build time via babel-plugin-macros or SWC plugin.

raw.macro

Webpack raw-loader implemented as babel-plugin-macros and SWC plugins

Installation

In order to use raw.macro in your own project, you can use one of the following commands:

$ yarn add --dev raw.macro
# or
$ npm install --save-dev raw.macro

Make sure babel-plugin-macros already installed. If you're using Create React App, it's installed by default.

Alternatively you can use SWC plugins and skip installing babel-plugins-macros entirely.

Usage

raw.macro is similar to Node’s require call:

import raw from "raw.macro";

const markdown = raw("./README.md");

Note: Because raw.macro uses babel internally to replace raw() calls, your transpiled code won't be changed if you only change the file that you import. This is because from babel perspective, your JS file is unchanged

One workaround that you can do that doesn't involve restarting your build system is making small changes where you put raw() calls, for example by adding console.log() with different content.

Custom Encoding

If you want to use custom encoding (by default it will use utf-8), you can pass it to the second argument

import raw from "raw.macro";

const binary = raw("./path/to/binary", "binary");

Dynamic path import

You can also use import dynamic path using template literal. You can even use them inside a function / React component!

import raw from "raw.macro";

function Article(props) {
  const content = raw(`../content/${props.locale}.md`);
  return <Markdown content={content} />;
}

This method has 2 caveats:

1. You can only use up to two variables inside template literal. 1 for directory name, and 1 for file name.
2. Using dynamic path import will includes all files that matches your dynamic path, which can make your JS bundle a lot bigger. This is also partly the reason of limitation described in #1

SWC

You can also use raw.macro in a swc-based project (e.g: Next.js) by using the SWC plugins.

Due to how the plugins is loaded, you have to pass rootDir option pointing to the root directory of your project (where your node_modules directory lives). Typically it's enough to pass __dirname.

// next.config.js
module.exports = {
  experimental: {
    swcPlugins: [
      [
        "raw.macro/swc",
        {
          rootDir: __dirname,
        },
      ],
    ],
  },
};

Note that currently SWC plugins only support reading text file from relative path and node_modules content. Using custom encoding or dynamic path import is not supported.

License

MIT