fix(core): patch VueFlow slots after build and apply correct types

.changeset/empty-candles-wash.md

@@ -0,0 +1,5 @@
+---
+'@vue-flow/core': patch
+---
+
+Fix untyped connection line, node and edge slots props by patching type definition after build

packages/core/package.json

@@ -24,7 +24,8 @@
   "scripts": {
     "prepare": "ts-patch install -s",
     "build": "vite build",
-    "types": "pnpm prepare && vue-tsc --declaration --emitDeclarationOnly && tsc -p tsconfig.build.json && shx rm -rf tmp && pnpm lint:dist",
+    "types": "pnpm prepare && vue-tsc --declaration --emitDeclarationOnly && tsc -p tsconfig.build.json && shx rm -rf tmp && pnpm lint:dist && pnpm run patch",
+    "patch": "node patch/slots.js  && pnpm lint:dist",
     "theme": "postcss src/style.css -o dist/style.css && postcss src/theme-default.css -o dist/theme-default.css",
     "lint": "eslint --ext \".js,.jsx,.ts,.tsx\" --fix --ignore-path ../../.gitignore .",
     "lint:dist": "eslint --ext \".ts,.tsx\" -c .eslintrc.js --fix ./dist",

packages/core/patch/slots.js

@@ -0,0 +1,79 @@
+const { readFile, writeFile } = require('fs/promises')
+const { resolve } = require('path')
+
+/**
+ * This is a workaround until slots can be properly typed from inside the VueFlow component
+ * It will overwrite `{}` typings with the correct prop types and add slot types for dynamic node and edge slots
+ */
+
+async function content(path) {
+  return readFile(path, 'utf8')
+}
+
+const filePath = resolve(__dirname, '../dist/container/VueFlow/VueFlow.vue.d.ts')
+
+const typeImportsString = `import type {
+  Connection,
+  EdgeChange,
+  EdgeMouseEvent,
+  EdgeUpdateEvent,
+  GraphEdge,
+  GraphNode,
+  NodeChange,
+  NodeDragEvent,
+  NodeMouseEvent,
+  OnConnectStartParams,
+  ViewpaneTransform,
+  VueFlowStore,
+} from '../../types'`
+
+const patchedTypeImports = `import type {
+  Connection,
+  ConnectionLineProps,
+  EdgeChange,
+  EdgeMouseEvent,
+  EdgeProps,
+  EdgeUpdateEvent,
+  GraphEdge,
+  GraphNode,
+  NodeChange,
+  NodeDragEvent,
+  NodeMouseEvent,
+  NodeProps,
+  OnConnectStartParams,
+  ViewpaneTransform,
+  VueFlowStore,
+} from '../../types'`
+
+const unpatchedSlots = `(new () => {
+    $slots: Record<string, {}> &
+      Record<string, {}> & {
+        'connection-line': (_: {}) => any
+        'zoom-pane': (_: {}) => any
+        'default': (_: {}) => any
+      }
+  })`
+
+const patchedSlots = `(new () => {
+    $slots: Record<string, any> & {
+      'connection-line': (connectionLineProps: ConnectionLineProps) => any
+      'zoom-pane': () => any
+      'default': () => any
+    } & {
+      [key: \`node-\${string}\`]: (nodeProps: NodeProps) => any
+    } & {
+      [key: \`edge-\${string}\`]: (edgeProps: EdgeProps) => any
+    }
+  })`
+
+const patchSlots = async () => {
+  const fileContents = await content(filePath)
+
+  const patchedFileContents = fileContents.replace(typeImportsString, patchedTypeImports).replace(unpatchedSlots, patchedSlots)
+
+  await writeFile(filePath, patchedFileContents)
+}
+
+patchSlots()
+  .then(() => console.log('slots patched'))
+  .catch(console.log)