Remark-mdx-remove-esm NPM

remark-mdx-remove-esm

This package is a unified (remark) plugin to remove import and/or export statements (mdxjsEsm) in MDX documents.

unified is a project that transforms content with abstract syntax trees (ASTs) using the new parser micromark. remark adds support for markdown to unified. mdast is the Markdown Abstract Syntax Tree (AST) which is a specification for representing markdown in a syntax tree.

This plugin is a remark plugin that removes "mdxjsEsm" type AST nodes in MDX which is parsed via remark-mdx.

When should I use this?

This plugin remark-mdx-remove-esm is useful if you want to remove import and / or export statements from a MDX document.

Installation

This package is suitable for ESM only. In Node.js (version 16+), install with npm:

npm install remark-mdx-remove-esm

yarn add remark-mdx-remove-esm

Usage

Say we have the following MDX file, example.mdx, which consists some import and export statements.

import x from "y";

Hi

export const b = 1;

And our module, example.js, looks as follows:

import { read } from "to-vfile";
import remark from "remark";
import remarkMdx from "remark-mdx";
import gfm from "remark-gfm";
import remarkRehype from "remark-rehype";
import rehypeStringify from "rehype-stringify";
import remarkMdxRemoveEsm from "remark-mdx-remove-esm";

main();

async function main() {
  const file = await remark()
    .use(remarkMdx)
    .use(gfm)
    .use(remarkMdxRemoveEsm)
    .use(remarkRehype)
    .use(rehypeStringify)
    .process(await read("example.mdx"));

  console.log(String(file));
}

Now, running node example.js you see that the imports and exports have been removed:

<p>Hi</p>

Without remark-mdx-remove-esm, running of the compiled source would cause the import and export statements work.

Options

The option can be either "import" or "export" or array of ("import" | "export").

By default it is undefined.

type MdxEsmSpecifier = "import" | "export";

type MdxRemoveEsmOptions = MdxEsmSpecifier | MdxEsmSpecifier[];

// removes both export and import statements
use(remarkMdxRemoveEsm);

// removes both export and import statements
use(remarkMdxRemoveEsm, undefined);

// removes ONLY import statements
use(remarkMdxRemoveEsm, "import"); 

// removes ONLY export statements
use(remarkMdxRemoveEsm, "export"); 

// removes ONLY import statements
use(remarkMdxRemoveEsm, ["import"]); 

// removes ONLY export statements
use(remarkMdxRemoveEsm, ["export"]); 

// removes both export and import statements
use(remarkMdxRemoveEsm, ["export", "import"]); 

// DOESN'T remove any statement
use(remarkMdxRemoveEsm, []);

`clsx` utiliy

The remark-mdx-remove-esm exports a small utility function called clsx to help developers don't need to download the clsx package.

The clsx has one functionality which is composing an array of MdxEsmSpecifier for the remark-mdx-remove-esm.

It returns

const disableExports: boolean | undefined = true;
const disableImports: boolean | undefined = undefined;

const mdxRemoveEsmOptions = clsx([disableExports && "export", disableImports && "import"]);

// mdxRemoveEsmOptions --> ["export"]

use(remarkMdxRemoveEsm, mdxRemoveEsmOptions);

Syntax tree

This plugin modifies the mdast (markdown abstract syntax tree).

Types

This package is fully typed with TypeScript.

The plugin exports the types MdxRemoveEsmOptions, MdxEsmSpecifier.

Compatibility

This plugin works with unified version 6+ and remark version 7+. It is compatible with MDX version 3.

Security

Use of remark-mdx-remove-esm does not involve rehype (hast) or user content so there are no openings for cross-site scripting (XSS) attacks.

My Plugins

I like to contribute the Unified / Remark / MDX ecosystem, so I recommend you to have a look my plugins.

My Remark Plugins

remark-flexible-code-titles – Remark plugin to add titles or/and containers for the code blocks with customizable properties
remark-flexible-containers – Remark plugin to add custom containers with customizable properties in markdown
remark-ins – Remark plugin to add ins element in markdown
remark-flexible-paragraphs – Remark plugin to add custom paragraphs with customizable properties in markdown
remark-flexible-markers – Remark plugin to add custom mark element with customizable properties in markdown
remark-flexible-toc – Remark plugin to expose the table of contents via vfile.data or via an option reference
remark-mdx-remove-esm – Remark plugin to remove import and/or export statements (mdxjsEsm)

My Rehype Plugins

rehype-pre-language – Rehype plugin to add language information as a property to pre element

My Recma Plugins

recma-mdx-escape-missing-components – Recma plugin to set the default value () => null for the Components in MDX in case of missing or not provided so as not to throw an error
recma-mdx-change-props – Recma plugin to change the props parameter into the _props in the function _createMdxContent(props) {/* */} in the compiled source in order to be able to use {props.foo} like expressions. It is useful for the next-mdx-remote or next-mdx-remote-client users in nextjs applications.