rehype-rewrite

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Rewrite element with rehype.

Installation

This package is ESM only: Node 12+ is needed to use it and it must be import instead of require.

npm install rehype-rewrite

Usage

🚧 Migrate from rehype-rewrite v2.x to v3.x.

rehype()
- .use(rehypeRewrite, (node, index, parent) => {})
+ .use(rehypeRewrite, {
+   rewrite: (node, index, parent) => {}
+ })
import { rehype } from 'rehype';
import rehypeRewrite from 'rehype-rewrite';
import stringify from 'rehype-stringify';

const html = `<h1>header</h1>`;
const htmlStr = rehype()
  .data('settings', { fragment: true })
  .use(rehypeRewrite, {
    rewrite: (node, index, parent) => {
      if(node.type == 'text' && node.value == 'header') {
        node.value = ''
      }
    }
  })
  .use(stringify)
  .processSync(html)
  .toString()
<h1>header</h1>

Output:

<h1></h1>

Options

import { Plugin } from 'unified';
import { Root, Element, RootContent } from 'hast';
export declare type RehypeRewriteOptions = {
  /**
   * Select an element to be wrapped. Expects a string selector that can be passed to hast-util-select ([supported selectors](https://github.com/syntax-tree/hast-util-select/blob/master/readme.md#support)).
   * If `selector` is not set then wrap will check for a body all elements.
   */
  selector?: string;
  /** Rewrite Element. */
  rewrite(node: Root | RootContent, index: number | null, parent: Root | Element | null): void;
};
declare const remarkRewrite: Plugin<[RehypeRewriteOptions?], Root>;
export default remarkRewrite;

selector?: string;

Select an element to be wrapped. Expects a string selector that can be passed to hast-util-select (supported selectors). If selector is not set then wrap will check for a body all elements.

rewrite(node, index, parent): void;

Rewrite element.

Example

Example 1

import { rehype } from 'rehype';
import rehypeRewrite from 'rehype-rewrite';
import stringify from 'rehype-stringify';

const html = `<h1>header</h1><h1>header</h1><h1 class="title3">header</h1>`;
const htmlStr = rehype()
  .data('settings', { fragment: true })
  .use(rehypeRewrite, {
    selector: 'h1',
    rewrite: (node) => {
      if (node.type === 'element') {
        node.properties.className = 'test';
      }
    }
  })
  .use(stringify)
  .processSync(html)
  .toString()
<h1>header</h1>
<h1>header</h1>
<h1 class="title3">header</h1>

Output:

<h1 class="test">header</h1>
<h1 class="test">header</h1>
<h1 class="test">header</h1>

Example 2

import { rehype } from 'rehype';
import rehypeRewrite from 'rehype-rewrite';
import stringify from 'rehype-stringify';

const html = `<h1>header</h1>`;
const htmlStr = rehype()
  .use(rehypeRewrite, {
    rewrite: (node) => {
      if (node.type == 'element' && node.tagName == 'body') {
        node.properties = { ...node.properties, style: 'color:red;'}
      }
    }
  })
  .use(stringify)
  .processSync(html)
  .toString()
<h1>header</h1>

Output:

<html><head></head><body style="color:red;"><h1>header</h1></body></html>

Example 3

import { rehype } from 'rehype';
import rehypeRewrite from 'rehype-rewrite';
import stringify from 'rehype-stringify';

const html = `<h1>hello</h1>`;
const htmlStr = rehype()
  .data('settings', { fragment: true })
  .use(rehypeRewrite, {
    rewrite: (node) => {
      if (node.type == 'element' && node.tagName == 'h1') {
        node.children = [ ...node.children, {
          type: 'element',
          tagName: 'span',
          properties: {},
          children: [
            {type: 'text', value: ' world'}
          ]
        }]
      }
    }
  })
  .use(stringify)
  .processSync(html)
  .toString()
<h1>hello</h1>

Output:

<h1>hello<span> world</span></h1>

Example 4

import { unified } from 'unified';
import remarkParse from 'remark-parse';
import rehypeRaw from 'rehype-raw';
import remark2rehype from 'remark-rehype';
import rehypeRewrite from 'rehype-rewrite';
import stringify from 'rehype-stringify';

const html = `<h1>hello</h1>`;
const htmlStr = unified()
  .use(remarkParse)
  .use(remark2rehype, { allowDangerousHtml: true })
  .use(rehypeRaw)
  .use(rehypeRewrite, {
    rewrite: (node) => {
      if (node.type == 'element' && node.tagName == 'h1') {
        node.properties = { ...node.properties, style: 'color:red;' }
      }
    }
  })
  .use(stringify)
  .processSync(html)
  .toString()
<h1>hello</h1>

Output:

<h1 style="color:red;">Hello World!</h1>

License

MIT © Kenny Wong