fix: eslint rule of using img in metadata routes (#74864)

Author: huozhi

packages/eslint-plugin-next/src/rules/no-img-element.ts

@@ -1,3 +1,4 @@
+import path = require('path')
 import { defineRule } from '../utils/define-rule'
 
 const url = 'https://nextjs.org/docs/messages/no-img-element'
@@ -15,6 +16,14 @@ export = defineRule({
     schema: [],
   },
   create(context) {
+    // Get relative path of the file
+    const relativePath = context.filename
+      .replace(path.sep, '/')
+      .replace(context.cwd, '')
+      .replace(/^\//, '')
+
+    const isAppDir = /^(src\/)?app\//.test(relativePath)
+
     return {
       JSXOpeningElement(node) {
         if (node.name.name !== 'img') {
@@ -29,6 +38,14 @@ export = defineRule({
           return
         }
 
+        // If is metadata route files, ignore
+        // e.g. opengraph-image.js, twitter-image.js, icon.js
+        if (
+          isAppDir &&
+          /\/opengraph-image|twitter-image|icon\.\w+$/.test(relativePath)
+        )
+          return
+
         context.report({
           node,
           message: `Using \`<img>\` could result in slower LCP and higher bandwidth. Consider using \`<Image />\` from \`next/image\` or a custom image loader to automatically optimize images. This may incur additional usage or cost from your provider. See: ${url}`,

test/unit/eslint-plugin-next/no-img-element.test.ts

@@ -55,6 +55,46 @@ const tests = {
           );
         }
       }`,
+    {
+      code: `\
+import { ImageResponse } from "next/og";
+
+export default function icon() {
+  return new ImageResponse(
+    (
+      <img
+        alt="avatar"
+        style={{ borderRadius: "100%" }}
+        width="100%"
+        height="100%"
+        src="https://example.com/image.png"
+      />
+    )
+  );
+}
+`,
+      filename: `src/app/icon.js`,
+    },
+    {
+      code: `\
+import { ImageResponse } from "next/og";
+
+export default function Image() {
+  return new ImageResponse(
+    (
+      <img
+        alt="avatar"
+        style={{ borderRadius: "100%" }}
+        width="100%"
+        height="100%"
+        src="https://example.com/image.png"
+      />
+    )
+  );
+}
+`,
+      filename: `app/opengraph-image.tsx`,
+    },
   ],
   invalid: [
     {
@@ -91,6 +131,27 @@ const tests = {
       }`,
       errors: [{ message, type: 'JSXOpeningElement' }],
     },
+    {
+      code: `\
+import { ImageResponse } from "next/og";
+
+export default function Image() {
+return new ImageResponse(
+  (
+    <img
+      alt="avatar"
+      style={{ borderRadius: "100%" }}
+      width="100%"
+      height="100%"
+      src="https://example.com/image.png"
+    />
+  )
+);
+}
+`,
+      filename: `some/non-metadata-route-image.tsx`,
+      errors: [{ message, type: 'JSXOpeningElement' }],
+    },
   ],
 }