strip-gh-theme-links

In Github you can specify the theme an image is displayed to by using <picture> HTML blocks in Markdown. See Specifying the theme an image is shown to.

However, other platforms currently do not support this tag and will display both versions of the image. So you might want to delete one of the images before uploading your documents to other platforms like, for example, Packagist (PHP) or PyPI (Python).

These npm package, CLI and Github Action are for you. They strip all the image theme links about one of the Github theme versions from your files. Perfect for running it before your packaging step in your release pipelines.

Note
The latest version supporting the deprecated #gh-dark-mode-only and #gh-light-mode-only hashes in inline images is v3.

Install

npm install strip-gh-theme-links

Usage

Node.js

import stripGhThemeLinks from "strip-gh-theme-links";

const content = `
<picture>
  <source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/dark">
  <source media="(prefers-color-scheme: light)" srcset="https://user-images.githubusercontent.com/light">
  <img alt="Alt text" title="Title text" src="https://user-images.githubusercontent.com/default" width=70>
</picture>
`;

console.log(await stripGhThemeLinks(content, "light"));
/* OUTPUT:
<img src="https://user-images.githubusercontent.com/light" alt="Alt text" title="Title text" width="70">
*/

console.log(await stripGhThemeLinks(content, "dark"));
/* OUTPUT:
<img src="https://user-images.githubusercontent.com/dark" alt="Alt text" title="Title text" width="70">
*/

console.log(await stripGhThemeLinks(content));
/* OUTPUT:
<img src="https://user-images.githubusercontent.com/default" alt="Alt text" title="Title text" width="70">
*/

Reference

# stripGhThemeLinks(content: string, keep?: 'light' | 'dark'): Promise<string>

• # content ⇒ Content for which the Github theme image links will be stripped.
• # keep ⇒ Theme variant links to keep in the content. If not specified the src attribute of the <img> tag will be used.

CLI

strip-gh-theme-links --help

Github Action

name: Release
on:
  workflow_dispatch:

jobs:
  release-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
      - name: Strip Github theme image links
        uses: mondeja/strip-gh-theme-links@v5
        with:
          files: |
            README.md
            CONTRIBUTING.md

Warning
It is recomended to run the CLI with strip-gh-theme-links --diff file.md to check that your files are correctly stripped before configure this action in your release pipeline.

Reference

Inputs

• # files (required) ⇒ Path to files or globs to strip, separated by newlines.
• # keep ⇒ Theme variant links to keep in the content of the files.
• # strict (default: false) ⇒ Treat warnings as errors and exit with code 1. Warnings are raised when a file specified in files input is not found or when no image links are stripped from a file.