feat(linter): implement no-negated-condition rule

crates/oxc_linter/src/config/rules.rs

@@ -160,6 +160,10 @@ fn transform_rule_and_plugin_name<'a>(
         return (rule_name, "eslint");
     }
 
+    if plugin_name == "unicorn" && rule_name == "no-negated-condition" {
+        return ("no-negated-condition", "eslint");
+    }
+
     (rule_name, plugin_name)
 }
 

crates/oxc_linter/src/rules/unicorn/no_negated_condition.rs

@@ -119,6 +119,20 @@ fn test() {
         r"if (a !== b) {}",
         r"if (a === b) {} else {}",
         r"a ? b : c",
+        // Test cases from ESLint
+        "if (a) {}",
+        "if (a) {} else {}",
+        "if (!a) {}",
+        "if (!a) {} else if (b) {}",
+        "if (!a) {} else if (b) {} else {}",
+        "if (a == b) {}",
+        "if (a == b) {} else {}",
+        "if (a != b) {}",
+        "if (a != b) {} else if (b) {}",
+        "if (a != b) {} else if (b) {} else {}",
+        "if (a !== b) {}",
+        "if (a === b) {} else {}",
+        "a ? b : c",
     ];
 
     let fail = vec![
@@ -140,6 +154,13 @@ fn test() {
         r"if(!a) {b()} else {c()}",
         r"if(!!a) b(); else c();",
         r"(!!a) ? b() : c();",
+        // Test cases from ESLint
+        "if (!a) {;} else {;}",
+        "if (a != b) {;} else {;}",
+        "if (a !== b) {;} else {;}",
+        "!a ? b : c",
+        "a != b ? c : d",
+        "a !== b ? c : d",
     ];
 
     Tester::new(NoNegatedCondition::NAME, NoNegatedCondition::CATEGORY, pass, fail)

crates/oxc_linter/src/snapshots/eslint_no_negated_condition.snap

@@ -0,0 +1,45 @@
+---
+source: crates/oxc_linter/src/tester.rs
+snapshot_kind: text
+---
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (!a) {;} else {;}
+   ·     ──
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (a != b) {;} else {;}
+   ·     ──────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (a !== b) {;} else {;}
+   ·     ───────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ !a ? b : c
+   · ──
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ a != b ? c : d
+   · ──────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ a !== b ? c : d
+   · ───────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.

crates/oxc_linter/src/snapshots/unicorn_no_negated_condition.snap

@@ -127,3 +127,45 @@ snapshot_kind: text
    ·  ───
    ╰────
   help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (!a) {;} else {;}
+   ·     ──
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (a != b) {;} else {;}
+   ·     ──────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:5]
+ 1 │ if (a !== b) {;} else {;}
+   ·     ───────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ !a ? b : c
+   · ──
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ a != b ? c : d
+   · ──────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.
+
+  ⚠ eslint-plugin-unicorn(no-negated-condition): Unexpected negated condition.
+   ╭─[no_negated_condition.tsx:1:1]
+ 1 │ a !== b ? c : d
+   · ───────
+   ╰────
+  help: Remove the negation operator and switch the consequent and alternate branches.