# Monaco YAML

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YAML language plugin for the Monaco Editor. It provides the following features when editing YAML
files:

- Code completion, based on JSON schemas or by looking at similar objects in the same file
- Hovers, based on JSON schemas
- Validation: Syntax errors and schema validation
- Formatting using Prettier
- Document Symbols
- Automatically load remote schema files (by enabling DiagnosticsOptions.enableSchemaRequest)

Schemas can also be provided by configuration. See
[here](https://github.com/remcohaszing/monaco-yaml/blob/main/index.d.ts) for the API that the plugin
offers to configure the YAML language support.

## Installation

```sh
npm install monaco-yaml
```

## Usage

Import `monaco-yaml` and configure it before an editor instance is created.

```ts
import { editor, Uri } from 'monaco-editor';
import { setDiagnosticsOptions } from 'monaco-yaml';

// The uri is used for the schema file match.
const modelUri = Uri.parse('a://b/foo.yaml');

setDiagnosticsOptions({
  enableSchemaRequest: true,
  hover: true,
  completion: true,
  validate: true,
  format: true,
  schemas: [
    {
      // Id of the first schema
      uri: 'http://myserver/foo-schema.json',
      // Associate with our model
      fileMatch: [String(modelUri)],
      schema: {
        type: 'object',
        properties: {
          p1: {
            enum: ['v1', 'v2'],
          },
          p2: {
            // Reference the second schema
            $ref: 'http://myserver/bar-schema.json',
          },
        },
      },
    },
    {
      // Id of the first schema
      uri: 'http://myserver/bar-schema.json',
      schema: {
        type: 'object',
        properties: {
          q1: {
            enum: ['x1', 'x2'],
          },
        },
      },
    },
  ],
});

editor.create(document.createElement('editor'), {
  // Monaco-yaml features should just work if the editor language is set to 'yaml'.
  language: 'yaml',
  model: editor.createModel('p1: \n', 'yaml', modelUri),
});
```

Also make sure to register the web worker.

## Examples

A demo is available on [monaco-yaml.js.org](https://monaco-yaml.js.org).

A running example: ![demo-image](test-demo.png)

Some usage examples can be found in the
[examples](https://github.com/remcohaszing/monaco-yaml/tree/main/examples) directory.

## Contributing

Please see our [contributing guidelines](CONTRIBUTING.md)

## Credits

Originally [@kpdecker](https://github.com/kpdecker) forked this repository from
[`monaco-json`](https://github.com/microsoft/monaco-json) by
[@microsoft](https://github.com/microsoft) and rewrote it to work with
[`yaml-language-server`](https://github.com/redhat-developer/yaml-language-server) instead. Later
the repository maintenance was taken over by [@pengx17](https://github.com/pengx17). Eventually the
repository was tranferred to the account of [@remcohaszing](https://github.com/remcohaszing), who is
currently maintaining this repository with the help of [fleon](https://github.com/fleon) and
[@yazaabed](https://github.com/yazaabed).

The heavy processing is done in
[`yaml-language-server`](https://github.com/redhat-developer/yaml-language-server), best known for
being the backbone for [`vscode-yaml`](https://github.com/redhat-developer/vscode-yaml). This
repository provides a thin layer to add functionality provided by `yaml-language-server` into
`monaco-editor`.

## License

[MIT](https://github.com/remcohaszing/monaco-yaml/blob/main/LICENSE.md)