feat: Interface Id Match rule (#492)

* create rule and tests

* reset readme

* update naming conventions

.README/README.md

@@ -54,6 +54,10 @@ npm install eslint babel-eslint eslint-plugin-flowtype --save-dev
       2,
       "never"
     ],
+    "flowtype/interface-id-match": [
+      2,
+      "^([A-Z][a-z0-9]+)+Type$"
+    ],
     "flowtype/no-mixed": 2,
     "flowtype/no-primitive-constructor-types": 2,
     "flowtype/no-types-missing-file-annotation": 2,
@@ -162,6 +166,7 @@ When `true`, only checks files with a [`@flow` annotation](http://flowtype.org/d
 {"gitdown": "include", "file": "./rules/delimiter-dangle.md"}
 {"gitdown": "include", "file": "./rules/enforce-line-break.md"}
 {"gitdown": "include", "file": "./rules/generic-spacing.md"}
+{"gitdown": "include", "file": "./rules/interface-id-match.md"}
 {"gitdown": "include", "file": "./rules/newline-after-flow-annotation.md"}
 {"gitdown": "include", "file": "./rules/no-dupe-keys.md"}
 {"gitdown": "include", "file": "./rules/no-existential-type.md"}

.README/rules/interface-id-match.md

@@ -0,0 +1,22 @@
+### `interface-id-match`
+
+Enforces a consistent naming pattern for interfaces.
+
+#### Options
+
+This rule requires a text RegExp:
+
+```js
+{
+    "rules": {
+        "flowtype/interface-id-match": [
+            2,
+            "^([A-Z][a-z0-9]*)+Type$"
+        ]
+    }
+}
+```
+
+`'^([A-Z][a-z0-9]*)+Type$$'` is the default pattern.
+
+<!-- assertions interfaceIdMatch -->

README.md

@@ -1870,7 +1870,7 @@ import Foo from './foo';
 // Message: Expected newline after flow annotation
 
 // Options: ["always-windows"]
-// @flow
+// @flow
 import Foo from './foo';
 // Message: Expected newline after flow annotation
 
@@ -1890,8 +1890,8 @@ The following patterns are not considered problems:
 import Foo from './foo';
 
 // Options: ["always-windows"]
-// @flow
-
+// @flow
+
 import Foo from './foo';
 
 // Options: ["never"]
@@ -3028,7 +3028,7 @@ The rule has two options:
 }
 ```
 
-* `allowNull` – allows compound types where one of the members is a `null`, e.g. `string | null`.
+* `allowNull` – allows compound types where one of the members is a `null`, e.g. `string | null`.
 
 The following patterns are considered problems:
 
@@ -5392,7 +5392,7 @@ The following patterns are not considered problems:
   { a: string, b: number }) => {}
 
 // Options: ["always",{"allowLineBreak":true}]
-(foo:
+(foo:
   { a: string, b: number }) => {}
 
 // Options: ["never"]
@@ -6719,4 +6719,3 @@ function x(foo: Type = bar()) {}
 ```
 
 
-

src/index.js

@@ -8,6 +8,7 @@ import defineFlowType from './rules/defineFlowType';
 import delimiterDangle from './rules/delimiterDangle';
 import enforceLineBreak from './rules/enforceLineBreak';
 import genericSpacing from './rules/genericSpacing';
+import interfaceIdMatch from './rules/interfaceIdMatch';
 import newlineAfterFlowAnnotation from './rules/newlineAfterFlowAnnotation';
 import noDupeKeys from './rules/noDupeKeys';
 import noExistentialType from './rules/noExistentialType';
@@ -56,6 +57,7 @@ const rules = {
   'delimiter-dangle': delimiterDangle,
   'enforce-line-break': enforceLineBreak,
   'generic-spacing': genericSpacing,
+  'interface-id-match': interfaceIdMatch,
   'newline-after-flow-annotation': newlineAfterFlowAnnotation,
   'no-dupe-keys': noDupeKeys,
   'no-existential-type': noExistentialType,
@@ -113,6 +115,7 @@ export default {
     'define-flow-type': 0,
     'delimiter-dangle': 0,
     'generic-spacing': 0,
+    'interface-id-match': 0,
     'newline-after-flow-annotation': 0,
     'no-dupe-keys': 0,
     'no-flow-fix-me-comments': 0,

src/rules/interfaceIdMatch.js

@@ -0,0 +1,29 @@
+const schema = [
+  {
+    type: 'string',
+  },
+];
+
+const create = (context) => {
+  const pattern = new RegExp(context.options[0] || '^([A-Z][a-z0-9]*)+Type$');
+
+  const checkInterface = (interfaceDeclarationNode) => {
+    const interfaceIdentifierName = interfaceDeclarationNode.id.name;
+
+    if (!pattern.test(interfaceIdentifierName)) {
+      context.report(interfaceDeclarationNode, 'Interface identifier \'{{name}}\' does not match pattern \'{{pattern}}\'.', {
+        name: interfaceIdentifierName,
+        pattern: pattern.toString(),
+      });
+    }
+  };
+
+  return {
+    InterfaceDeclaration: checkInterface,
+  };
+};
+
+export default {
+  create,
+  schema,
+};

tests/rules/assertions/interfaceIdMatch.js

@@ -0,0 +1,63 @@
+export default {
+  invalid: [
+    {
+      code: 'interface foo{};',
+      errors: [
+        {
+          message: 'Interface identifier \'foo\' does not match pattern \'/^([A-Z][a-z0-9]*)+Type$/\'.',
+        },
+      ],
+    },
+    {
+      code: 'interface FooType{};',
+      errors: [
+        {
+          message: 'Interface identifier \'FooType\' does not match pattern \'/^foo$/\'.',
+        },
+      ],
+      options: [
+        '^foo$',
+      ],
+    },
+  ],
+  misconfigured: [
+    {
+      errors: [
+        {
+          data: 7,
+          dataPath: '[0]',
+          keyword: 'type',
+          message: 'should be string',
+          params: {
+            type: 'string',
+          },
+          parentSchema: {
+            type: 'string',
+          },
+          schema: 'string',
+          schemaPath: '#/items/0/type',
+        },
+      ],
+      options: [7],
+    },
+  ],
+  valid: [
+    {
+      code: 'interface FooType {};',
+    },
+    {
+      code: 'interface foo {};',
+      options: [
+        '^foo$',
+      ],
+    },
+    {
+      code: 'interface foo {};',
+      settings: {
+        flowtype: {
+          onlyFilesWithFlowAnnotation: true,
+        },
+      },
+    },
+  ],
+};

tests/rules/index.js

@@ -19,6 +19,7 @@ const reportingRules = [
   'delimiter-dangle',
   'enforce-line-break',
   'generic-spacing',
+  'interface-id-match',
   'newline-after-flow-annotation',
   'no-dupe-keys',
   'no-existential-type',