feat(eslint-plugin): new import dedupe rule

packages/eslint-plugin-antfu/src/rules/import-dedupe.ts

@@ -0,0 +1,55 @@
+import { createEslintRule } from '../utils'
+
+export const RULE_NAME = 'import-dedupe'
+export type MessageIds = 'importDedupe'
+export type Options = []
+
+export default createEslintRule<Options, MessageIds>({
+  name: RULE_NAME,
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'Fix duplication in imports',
+      recommended: 'error',
+    },
+    fixable: 'code',
+    schema: [],
+    messages: {
+      importDedupe: 'Expect no duplication in imports',
+    },
+  },
+  defaultOptions: [],
+  create: (context) => {
+    return {
+      ImportDeclaration(node) {
+        if (node.specifiers.length <= 1)
+          return
+
+        const names = new Set<string>()
+        node.specifiers.forEach((n) => {
+          const id = n.local.name
+          if (names.has(id)) {
+            context.report({
+              node,
+              loc: {
+                start: n.loc.end,
+                end: n.loc.start,
+              },
+              messageId: 'importDedupe',
+              fix(fixer) {
+                const s = n.range[0]
+                let e = n.range[1]
+                if (context.getSourceCode().text[e] === ',')
+                  e += 1
+                return fixer.removeRange([s, e])
+              },
+            })
+          }
+          names.add(id)
+        })
+
+        // console.log(node)
+      },
+    }
+  },
+})