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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?

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

or

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

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 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
• rehype-highlight-code-lines – Rehype plugin to add line numbers to code blocks and allow highlighting of desired code lines
• rehype-code-meta – Rehype plugin to copy code.data.meta to code.properties.metastring
• rehype-image-toolkit – Rehype plugin to enhance Markdown image syntax ![]() and Markdown/MDX media elements (<img>, <audio>, <video>) by auto-linking bracketed or parenthesized image URLs, wrapping them in <figure> with optional captions, unwrapping images/videos/audio from paragraph, parsing directives in title for styling and adding attributes, and dynamically converting images into <video> or <audio> elements based on file extension.

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.
• recma-mdx-change-imports – Recma plugin to convert import declarations for assets and media with relative links into variable declarations with string URLs, enabling direct asset URL resolution in compiled MDX.
• recma-mdx-import-media – Recma plugin to turn media relative paths into import declarations for both markdown and html syntax in MDX.
• recma-mdx-import-react – Recma plugin to ensure getting React instance from the arguments and to make the runtime props {React, jsx, jsxs, jsxDev, Fragment} is available in the dynamically imported components in the compiled source of MDX.
• recma-mdx-html-override – Recma plugin to allow selected raw HTML elements to be overridden via MDX components.
• recma-mdx-interpolate – Recma plugin to enable interpolation of identifiers wrapped in curly braces within the alt, src, href, and title attributes of markdown link and image syntax in MDX.

License

MIT License © ipikuka