feat: add auto-hmr-plugin and autoHmr option

src/auto-hmr/ast.ts

@@ -0,0 +1,75 @@
+import type { AstNode } from 'rollup'
+import type { VariableDeclarator, ImportDeclaration } from 'estree'
+
+export function nameFromDeclaration(node?: VariableDeclarator) {
+  return node?.id.type === 'Identifier' ? node.id.name : ''
+}
+
+export function getRouterDeclaration(nodes?: VariableDeclarator[]) {
+  return nodes?.find(
+    (x) =>
+      x.init?.type === 'CallExpression' &&
+      x.init.callee.type === 'Identifier' &&
+      (x.init.callee.name === 'createRouter' ||
+        x.init.callee.name === 'experimental_createRouter')
+  )
+}
+
+export function getHandleHotUpdateDeclaration(node?: ImportDeclaration, modulePath?: string) {
+  return (
+    node?.type === 'ImportDeclaration' &&
+    node.source.value === modulePath &&
+    node.specifiers.some(
+      (x) =>
+        x.type === 'ImportSpecifier' &&
+        x.imported.type === 'Identifier' &&
+        x.imported.name === 'handleHotUpdate'
+    )
+  )
+}
+
+export function hasHandleHotUpdateCall(ast: AstNode) {
+  const visited = new WeakSet()
+
+  function traverse(node: any) {
+    if (!node || typeof node !== 'object' || visited.has(node)) return false
+    visited.add(node)
+
+    if (
+      node.type === 'CallExpression' &&
+      node.callee.type === 'Identifier' &&
+      node.callee.name === 'handleHotUpdate'
+    ) {
+      return true
+    }
+
+    // e.g.: autoRouter.handleHotUpdate()
+    if (
+      node.type === 'CallExpression' &&
+      node.callee.type === 'MemberExpression' &&
+      node.callee.property.type === 'Identifier' &&
+      node.callee.property.name === 'handleHotUpdate'
+    ) {
+      return true
+    }
+
+    if (typeof node !== 'object') return false
+
+    for (const key in node) {
+      if (key === 'type' || key === 'loc' || key === 'range') continue
+
+      const child = node[key]
+      if (Array.isArray(child)) {
+        for (const item of child) {
+          if (traverse(item)) return true
+        }
+      } else if (typeof child === 'object' && child !== null) {
+        if (traverse(child)) return true
+      }
+    }
+
+    return false
+  }
+
+  return traverse(ast);
+}