[Fix] static-property-placement: do not report non-components

Fixes #2884.

Author: chiawendt

CHANGELOG.md

@@ -8,9 +8,11 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 ### Fixed
 * [`jsx-no-constructed-context-values`]: avoid a crash with `as X` TS code ([#2894][] @ljharb)
 * [`jsx-no-constructed-context-values`]: avoid a crash with boolean shorthand ([#2895][] @ljharb)
+* [`static-property-placement`]: do not report non-components ([#2893][] @golopot)
 
 [#2895]: https://github.com/yannickcr/eslint-plugin-react/issues/2895
 [#2894]: https://github.com/yannickcr/eslint-plugin-react/issues/2894
+[#2893]: https://github.com/yannickcr/eslint-plugin-react/pull/2893
 
 ## [7.22.0] - 2020.12.29
 

lib/rules/static-property-placement.js

@@ -131,7 +131,13 @@ module.exports = {
     // Public
     // ----------------------------------------------------------------------
     return {
-      ClassProperty: (node) => reportNodeIncorrectlyPositioned(node, STATIC_PUBLIC_FIELD),
+      ClassProperty: (node) => {
+        if (!utils.getParentES6Component()) {
+          return;
+        }
+
+        reportNodeIncorrectlyPositioned(node, STATIC_PUBLIC_FIELD);
+      },
 
       MemberExpression: (node) => {
         // If definition type is undefined then it must not be a defining expression or if the definition is inside a
@@ -155,7 +161,7 @@ module.exports = {
 
       MethodDefinition: (node) => {
         // If the function is inside a class and is static getter then check if correctly positioned
-        if (isContextInClass() && node.static && node.kind === 'get') {
+        if (utils.getParentES6Component() && node.static && node.kind === 'get') {
           // Report error if needed
           reportNodeIncorrectlyPositioned(node, STATIC_GETTER);
         }

tests/lib/rules/static-property-placement.js

@@ -181,6 +181,26 @@ ruleTester.run('static-property-placement', rule, {
         };
       `].join('\n')
     },
+
+    {
+      // Do not error on non-component classes #2884
+      code: `
+        class Foo {
+          static get propTypes() {}
+        }
+      `
+    },
+
+    {
+      // Do not error on non-component classes #2884
+      code: `
+        class Foo {
+          static propTypes = {}
+        }
+      `,
+      options: [PROPERTY_ASSIGNMENT]
+    },
+
     // ------------------------------------------------------------------------------
     // no properties
     // ------------------------------------------------------------------------------