WIP: Add array-type rule

lib/rules/array-type.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview Requires using either 'T[]' or 'Array' for arrays.
+ * @author Mackie Underdown
+ */
+"use strict";
+
+const util = require("../util");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "Requires using either 'T[]' or 'Array' for arrays",
+            extraDescription: [util.tslintRule("array-type")],
+            category: "TypeScript",
+            url:
+                "https://github.com/nzakas/eslint-plugin-typescript/blob/master/docs/rules/array-type.md"
+        },
+        schema: [
+            {
+                enum: ["array", "generic", "array-simple"]
+            }
+        ]
+    },
+    create(context) {
+        const arrayType = context.options[0] || "array";
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            TypeAnnotation: console.log, // eslint-disable-line no-console
+            TSArrayType(node) {
+                console.log(node); // eslint-disable-line no-console
+                if (arrayType === "generic") {
+                    context.report({
+                        node,
+                        message:
+                            "Array type using 'T[]' is forbidden. Use 'Array<T>' instead."
+                    });
+                }
+            },
+            TSTypeReference(node) {
+                console.log(node); // eslint-disable-line no-console
+                if (node.typeName.name === "Array" && arrayType === "array") {
+                    context.report({
+                        node,
+                        message:
+                            "Array type using 'Array<T>' is forbidden. Use 'T[]' instead."
+                    });
+                }
+            }
+        };
+    }
+};

tests/lib/rules/array-type.js

@@ -0,0 +1,122 @@
+/**
+ * @fileoverview Requires using either 'T[]' or 'Array' for arrays.
+ * @author Mackie Underdown
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const rule = require("../../../lib/rules/array-type"),
+    RuleTester = require("eslint").RuleTester;
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+const arrayMessage =
+    "Array type using 'Array<T>' is forbidden. Use 'T[]' instead.";
+const genericMessage =
+    "Array type using 'T[]' is forbidden. Use 'Array<T>' instead.";
+
+const ruleTester = new RuleTester({
+    parser: "typescript-eslint-parser"
+});
+
+ruleTester.run("array-type", rule, {
+    valid: [
+        {
+            code: "let a: string[] = []",
+            options: ["array"]
+        },
+        {
+            code: "let a: (string | number)[] = []",
+            options: ["array"]
+        },
+        {
+            code: "let a: ({ foo: Bar[] })[] = []",
+            options: ["array"]
+        },
+        {
+            code: "let a: Array<string> = []",
+            options: ["generic"]
+        },
+        {
+            code: "let a: Array<string| number> = []",
+            options: ["generic"]
+        },
+        {
+            code: "let a: Array<{ foo: Array<Bar> }> = []",
+            options: ["generic"]
+        }
+    ],
+    invalid: [
+        {
+            code: "let a: Array<string> = []",
+            options: ["array"],
+            errors: [
+                {
+                    message: arrayMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        },
+        {
+            code: "let a: Array<string | number> = []",
+            options: ["array"],
+            errors: [
+                {
+                    message: arrayMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        },
+        {
+            code: "let a: ({ foo: Array<Bar> })[] = []",
+            options: ["array"],
+            errors: [
+                {
+                    message: arrayMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        },
+        {
+            code: "let a: string[] = []",
+            options: ["generic"],
+            errors: [
+                {
+                    message: genericMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        },
+        {
+            code: "let a: (string | number)[] = []",
+            options: ["generic"],
+            errors: [
+                {
+                    message: genericMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        },
+        {
+            code: "let a: Array<{ foo: Bar[] }> = []",
+            options: ["generic"],
+            errors: [
+                {
+                    message: genericMessage,
+                    line: 1,
+                    column: 8
+                }
+            ]
+        }
+    ]
+});