Documentation: Use Remark as linter in text editors

content/docs/editor-tooling.md

@@ -0,0 +1,44 @@
+---
+title: Editor Tooling
+weight: 60
+group: Customization
+aliases:
+  - custom-formatters
+---
+
+## Linting via remark
+
+If you want to lint your markdown files as part of your development workflow (in editors, in a pre-commit hook, and/or via CI), then we suggest you use `remark`. Remark is the library used by the Decap markdown widget.
+
+If you were to use a different linter than `remark` (such as `prettier`, etc), then you would end up with formatting conflicts between files. Files edited via the Decap web interface would be formatted differently than files edited via your development workflow.
+
+To set this up, you will need to install and set up both of these npm packages in your project:
+
+- remark: https://remark.js.org/
+- remark-frontmatter: https://github.com/remarkjs/remark-frontmatter
+
+## Custom Formatters
+
+To manage content with other file formats than the built-in ones, you can register a custom formatter:
+
+```js
+const JSON5 = require("json5");
+
+CMS.registerCustomFormat("json5", "json5", {
+  fromFile: (text) => JSON5.parse(text),
+  toFile: (value) => JSON5.stringify(value, null, 2),
+});
+```
+
+Then include `format: json5` in your collection configuration. See the [Collection docs](https://www.decapcms.org/docs/configuration-options/#collections) for more details.
+
+You can also override the built-in formatters. For example, to change the YAML serialization method from [`yaml`](https://npmjs.com/package/yaml) to [`js-yaml`](https://npmjs.com/package/js-yaml):
+
+```js
+const jsYaml = require("js-yaml");
+
+CMS.registerCustomFormat("yml", "yml", {
+  fromFile: (text) => jsYaml.load(text),
+  toFile: (value) => jsYaml.dump(value),
+});
+```