feat(linter): add support for extends property in oxlintrc

Author: camchenry

crates/oxc_linter/src/config/config_builder.rs

@@ -93,6 +93,7 @@ impl ConfigStoreBuilder {
             overrides,
             path,
             ignore_patterns: _,
+            extends: _,
         } = oxlintrc;
 
         let config = LintConfig { plugins, settings, env, globals, path: Some(path) };

crates/oxc_linter/src/config/oxlintrc.rs

@@ -95,6 +95,12 @@ pub struct Oxlintrc {
     /// Globs to ignore during linting. These are resolved from the configuration file path.
     #[serde(rename = "ignorePatterns")]
     pub ignore_patterns: Vec<String>,
+    /// Paths of configuration files that this configuration file extends (inherits from). The files
+    /// are resolved relative to the location of the configuration file that contains the `extends`
+    /// property. The configuration files are merged from the first to the last, with the last file
+    /// overriding the previous ones.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub extends: Vec<PathBuf>,
 }
 
 impl Oxlintrc {
@@ -155,6 +161,7 @@ mod test {
         assert_eq!(config.settings, OxlintSettings::default());
         assert_eq!(config.env, OxlintEnv::default());
         assert_eq!(config.path, PathBuf::default());
+        assert_eq!(config.extends, Vec::<PathBuf>::default());
     }
 
     #[test]
@@ -184,4 +191,23 @@ mod test {
             serde_json::from_str(r#"{ "plugins": ["typescript", "@typescript-eslint"] }"#).unwrap();
         assert_eq!(config.plugins, LintPlugins::TYPESCRIPT);
     }
+
+    #[test]
+    fn test_oxlintrc_extends() {
+        let config: Oxlintrc = serde_json::from_str(
+            r#"{"extends": [".oxlintrc.json", "./oxlint-ts.json", "../.config/.oxlintrc.json"]}"#,
+        )
+        .unwrap();
+        assert_eq!(
+            config.extends,
+            vec![
+                PathBuf::from(".oxlintrc.json"),
+                PathBuf::from("./oxlint-ts.json"),
+                PathBuf::from("../.config/.oxlintrc.json")
+            ]
+        );
+
+        let config: Oxlintrc = serde_json::from_str(r#"{"extends": []}"#).unwrap();
+        assert_eq!(0, config.extends.len());
+    }
 }

crates/oxc_linter/src/snapshots/schema_json.snap

@@ -27,6 +27,13 @@ expression: json
         }
       ]
     },
+    "extends": {
+      "description": "Paths of configuration files that this configuration file extends (inherits from). The files are resolved relative to the location of the configuration file that contains the `extends` property. The configuration files are merged from the first to the last, with the last file overriding the previous ones.",
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
     "globals": {
       "description": "Enabled or disabled specific global variables.",
       "default": {},

npm/oxlint/configuration_schema.json

@@ -23,6 +23,13 @@
         }
       ]
     },
+    "extends": {
+      "description": "Paths of configuration files that this configuration file extends (inherits from). The files are resolved relative to the location of the configuration file that contains the `extends` property. The configuration files are merged from the first to the last, with the last file overriding the previous ones.",
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
     "globals": {
       "description": "Enabled or disabled specific global variables.",
       "default": {},

tasks/website/src/linter/snapshots/schema_markdown.snap

@@ -1,7 +1,6 @@
 ---
 source: tasks/website/src/linter/json_schema.rs
 expression: snapshot
-snapshot_kind: text
 ---
 # Oxlint Configuration File
 
@@ -135,6 +134,14 @@ Predefine global variables.
 Environments specify what global variables are predefined. See [ESLint's list of environments](https://eslint.org/docs/v8.x/use/configure/language-options#specifying-environments) for what environments are available and what each one provides.
 
 
+## extends
+
+type: `string[]`
+
+
+Paths of configuration files that this configuration file extends (inherits from). The files are resolved relative to the location of the configuration file that contains the `extends` property. The configuration files are merged from the first to the last, with the last file overriding the previous ones.
+
+
 ## globals
 
 type: `Record<string, string>`