Fix: Fix false negatives and reporting location in require-meta-type (#155)

Author: bmish

lib/rules/require-meta-type.js

@@ -5,6 +5,7 @@
 
 'use strict';
 
+const { getStaticValue } = require('eslint-utils');
 const utils = require('../utils');
 const VALID_TYPES = new Set(['problem', 'suggestion', 'layout']);
 
@@ -52,10 +53,19 @@ module.exports = {
           metaNode.properties &&
           metaNode.properties.find(p => p.type === 'Property' && utils.getKeyName(p) === 'type');
 
-        if (typeNode && typeNode.value.type === 'Literal' && !VALID_TYPES.has(typeNode.value.value)) {
-          context.report({ node: metaNode, messageId: 'unexpected' });
-        } else if (!typeNode) {
+        if (!typeNode) {
           context.report({ node: metaNode, messageId: 'missing' });
+          return;
+        }
+
+        const staticValue = getStaticValue(typeNode.value, context.getScope());
+        if (!staticValue) {
+          // Ignore non-static values since we can't determine what they look like.
+          return;
+        }
+
+        if (!VALID_TYPES.has(staticValue.value)) {
+          context.report({ node: typeNode.value, messageId: 'unexpected' });
         }
       },
     };

tests/lib/rules/require-meta-type.js

@@ -37,6 +37,25 @@ ruleTester.run('require-meta-type', rule, {
         create(context) {}
       };
     `,
+    `
+      const type = 'problem';
+      module.exports = {
+        meta: { type },
+        create(context) {}
+      };
+    `,
+    `
+      module.exports = {
+        meta: { type: getType() },
+        create(context) {}
+      };
+    `,
+    `
+      module.exports = {
+        meta: { type: FOO },
+        create(context) {}
+      };
+    `,
     `module.exports = {
       create(context) {}
     }`,
@@ -60,7 +79,7 @@ ruleTester.run('require-meta-type', rule, {
           create(context) {}
         };
       `,
-      errors: [{ messageId: 'missing' }],
+      errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
     },
     {
       code: `
@@ -70,7 +89,7 @@ ruleTester.run('require-meta-type', rule, {
           create,
         };
       `,
-      errors: [{ messageId: 'missing' }],
+      errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
     },
     {
       code: `
@@ -80,7 +99,7 @@ ruleTester.run('require-meta-type', rule, {
           create,
         };
       `,
-      errors: [{ messageId: 'missing' }],
+      errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
     },
     {
       code: `
@@ -90,7 +109,7 @@ ruleTester.run('require-meta-type', rule, {
           create,
         };
       `,
-      errors: [{ messageId: 'missing' }],
+      errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
     },
     {
       code: `
@@ -99,7 +118,35 @@ ruleTester.run('require-meta-type', rule, {
           create(context) {}
         };
       `,
-      errors: [{ messageId: 'unexpected' }],
+      errors: [{ messageId: 'unexpected', type: 'Literal' }],
+    },
+    {
+      code: `
+        const type = 'invalid-type';
+        module.exports = {
+          meta: { type },
+          create(context) {}
+        };
+      `,
+      errors: [{ messageId: 'unexpected', type: 'Identifier' }],
+    },
+    {
+      code: `
+        module.exports = {
+          meta: { type: null },
+          create(context) {}
+        };
+      `,
+      errors: [{ messageId: 'unexpected', type: 'Literal' }],
+    },
+    {
+      code: `
+        module.exports = {
+          meta: { type: undefined },
+          create(context) {}
+        };
+      `,
+      errors: [{ messageId: 'unexpected', type: 'Identifier' }],
     },
   ],
 });