1# Rego
 2
 3Rego language support in Zed is provided by the community-maintained [Rego extension](https://github.com/StyraInc/zed-rego).
 4
 5- Tree-sitter: [FallenAngel97/tree-sitter-rego](https://github.com/FallenAngel97/tree-sitter-rego)
 6- Language Server: [StyraInc/regal](https://github.com/StyraInc/regal)
 7
 8## Installation
 9
10The extensions is largely based on the [Regal](https://docs.styra.com/regal/language-server) language server which should be installed to make use of the extension. Read the [getting started](https://docs.styra.com/regal#getting-started) instructions for more information.
11
12## Configuration
13
14The extension's behavior is configured in the `.regal/config.yaml` file. The following is an example configuration which disables the `todo-comment` rule, customizes the `line-length` rule, and ignores test files for the `opa-fmt` rule:
15
16```yaml
17rules:
18  style:
19    todo-comment:
20      # don't report on todo comments
21      level: ignore
22    line-length:
23      # custom rule configuration
24      max-line-length: 100
25      # warn on too long lines, but don't fail
26      level: warning
27    opa-fmt:
28      # not needed as error is the default, but
29      # being explicit won't hurt
30      level: error
31      # files can be ignored for any individual rule
32      # in this example, test files are ignored
33      ignore:
34        files:
35          - "*_test.rego"
36```
37
38Read Regal's [configuration documentation](https://docs.styra.com/regal#configuration) for more information.