https://codemirror.net/6/

CodeMirror
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Extensible Code Editor

CodeMirror 6 is a rewrite of the CodeMirror code editor. It greatly
improves the library's accessibility and touchscreen support,
provides better content analysis and a modern programming interface.
The new system matches the existing code in features and performance.
It is not API-compatible with the old code.

The project is in the beta phase--there's a stable interface, but
small breaking changes might still happen. It is being used in
production in a few mid-size systems, but is not as battle-tested as
the old version.

Features

  * Accessible

    This version of CodeMirror was designed from the start with
    accessibility in mind, avoiding a number of pitfalls that the
    current crop of editors suffer from.

  * Touchscreen Support

    Using a native editable control allows you to use the editor on a
    phone or tablet with the platform's native selection and editing
    behavior.

  * Extensible

    A more structured extension interface allows you to implement
    complicated extensions in a robust way, without the race
    conditions and complexity they would involve in the old system.

  * Modular

    The system's core is extremely generic, and even basic features
    like syntax highlighting and line number gutters are implemented
    as extensions, allowing you to omit or replace them if you need
    to.

  * Full Parsing

    The recommended way to write language integration for CodeMirror
    6 involves a full parse tree, which makes code analysis easier
    and more powerful.

  * Fast

    By carefully doing only the work that needs to be done, the
    library manages to be fast even with gigantic documents and long
    lines.

About

CodeMirror is open source (MIT or GPL3). It is being developed on
GitHub. Contributions are welcome.

If you are using CodeMirror commercially, there is a social
expectation that you help fund its maintenance.   Start here.

The library supports browsers up from Internet Explorer 11 (with some
polyfills).

Discussing the project, or asking questions, is best done on the
forum. Bugs should be reported through the issue tracker. We aim to
be an inclusive, welcoming community. To make that explicit, we have
a code of conduct that applies to communication around the project.

Language Support

  * CSS
  * C++
  * HTML
  * Java
  * JavaScript
  * JSON
  * Markdown
  * Python
  * Rust
  * XML

There is also a collection of CodeMirror 5 modes that can be used--if
no full support is available for your language, you may still find a
highlighter in there.

Sponsors

These wonderful companies and organizations helped fund the work on
CodeMirror 6.

Diamond

Automattic Mozilla Bundesministerium fur Bildung und Forschung

Gold

Wikimedia Foundation

Silver

Cargo Dataiku Overleaf

Bronze

Andrew Lee Buildkite Nuclino Pobox Repl.it superhi
Code of Conduct Report an Issue