fix(eslint-plugin): fix false positive from adjacent-overload-signatures (#206)

Author: lukyth

Diff for: packages/eslint-plugin/lib/rules/adjacent-overload-signatures.js

@@ -73,6 +73,17 @@ module.exports = {
       }
     }
 
+    /**
+     * Determine whether two methods are the same or not
+     * @param {{ name: string; static: boolean }} method1 a method to compare
+     * @param {{ name: string; static: boolean }} method2 another method to compare with
+     * @returns {boolean} true if two methods are the same
+     * @private
+     */
+    function isSameMethod(method1, method2) {
+      return method1.name === method2.name && method1.static === method2.static;
+    }
+
     /**
      * Check the body for overload methods.
      * @param {ASTNode} node the body to be inspected.
@@ -83,28 +94,32 @@ module.exports = {
       const members = node.body || node.members;
 
       if (members) {
-        let name;
-        let index;
-        let lastName;
-        const seen = [];
+        let lastMethod;
+        const seenMethods = [];
 
         members.forEach(member => {
-          name = getMemberName(member);
+          const name = getMemberName(member);
+          const method = {
+            name,
+            static: member.static
+          };
 
-          index = seen.indexOf(name);
-          if (index > -1 && lastName !== name) {
+          const index = seenMethods.findIndex(seenMethod =>
+            isSameMethod(method, seenMethod)
+          );
+          if (index > -1 && !isSameMethod(method, lastMethod)) {
             context.report({
               node: member,
               messageId: 'adjacentSignature',
               data: {
-                name
+                name: (method.static ? 'static ' : '') + method.name
               }
             });
           } else if (name && index === -1) {
-            seen.push(name);
+            seenMethods.push(method);
           }
 
-          lastName = name;
+          lastMethod = method;
         });
       }
     }

Diff for: packages/eslint-plugin/tests/lib/rules/adjacent-overload-signatures.js

@@ -211,6 +211,23 @@ class Foo {
     foo(sn: string | number): void {}
     bar(): void {}
     baz(): void {}
+}
+        `,
+    `
+class Foo {
+    name: string;
+    static foo(s: string): void;
+    static foo(n: number): void;
+    static foo(sn: string | number): void {}
+    bar(): void {}
+    baz(): void {}
+}
+        `,
+    `
+class Test {
+  static test() {}
+  untest() {}
+  test() {}
 }
         `,
     // examples from https://github.com/nzakas/eslint-plugin-typescript/issues/138
@@ -789,6 +806,26 @@ class Foo {
           column: 5
         }
       ]
+    },
+    {
+      code: `
+class Foo {
+    static foo(s: string): void;
+    name: string;
+    static foo(n: number): void;
+    static foo(sn: string | number): void {}
+    bar(): void {}
+    baz(): void {}
+}
+            `,
+      errors: [
+        {
+          messageId: 'adjacentSignature',
+          data: { name: 'static foo' },
+          line: 5,
+          column: 5
+        }
+      ]
     }
   ]
 });