chore: release v6.4.0

package.json

@@ -1,6 +1,6 @@
 {
     "name": "lwc-monorepo",
-    "version": "6.3.4",
+    "version": "6.4.0",
     "private": true,
     "description": "Lightning Web Components",
     "repository": {
@@ -31,7 +31,7 @@
         "prettier": "v3 requires ESM, and we use prettier in our Jest tests. Jest does not support ESM yet."
     },
     "devDependencies": {
-        "@babel/plugin-transform-modules-commonjs": "^7.23.3",
+        "@babel/plugin-transform-modules-commonjs": "^7.24.1",
         "@commitlint/cli": "^19.0.3",
         "@lwc/eslint-plugin-lwc-internal": "link:./scripts/eslint-plugin",
         "@lwc/jest-utils-lwc-internals": "link:./scripts/jest/utils",
@@ -42,12 +42,12 @@
         "@rollup/plugin-typescript": "^11.1.6",
         "@types/babel__core": "^7.20.5",
         "@types/jest": "^29.5.12",
-        "@types/node": "^20.11.26",
+        "@types/node": "^20.11.30",
         "@types/prettier": "^2.7.3",
-        "@typescript-eslint/eslint-plugin": "^7.2.0",
-        "@typescript-eslint/parser": "^7.2.0",
+        "@typescript-eslint/eslint-plugin": "^7.3.1",
+        "@typescript-eslint/parser": "^7.3.1",
         "bytes": "^3.1.2",
-        "es-module-lexer": "^1.4.1",
+        "es-module-lexer": "^1.4.2",
         "eslint": "^8.57.0",
         "eslint-plugin-header": "^3.1.1",
         "eslint-plugin-import": "^2.29.1",

packages/@lwc/aria-reflection/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/aria-reflection",
-    "version": "6.3.4",
+    "version": "6.4.0",
     "description": "ARIA element reflection polyfill for strings",
     "keywords": [
         "aom",

packages/@lwc/babel-plugin-component/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/babel-plugin-component",
-    "version": "6.3.4",
+    "version": "6.4.0",
     "description": "Babel plugin to transform a LWC module",
     "keywords": [
         "lwc"
@@ -43,8 +43,8 @@
     },
     "dependencies": {
         "@babel/helper-module-imports": "7.22.15",
-        "@lwc/errors": "6.3.4",
-        "@lwc/shared": "6.3.4",
+        "@lwc/errors": "6.4.0",
+        "@lwc/shared": "6.4.0",
         "line-column": "~1.0.2"
     },
     "devDependencies": {

packages/@lwc/compiler/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/compiler",
-    "version": "6.3.4",
+    "version": "6.4.0",
     "description": "LWC compiler",
     "keywords": [
         "lwc"
@@ -42,16 +42,16 @@
         }
     },
     "dependencies": {
-        "@babel/core": "7.24.0",
+        "@babel/core": "7.24.1",
         "@babel/plugin-proposal-async-generator-functions": "7.20.7",
         "@babel/plugin-proposal-class-properties": "7.18.6",
         "@babel/plugin-proposal-object-rest-spread": "7.20.7",
         "@babel/plugin-transform-async-to-generator": "7.23.3",
         "@locker/babel-plugin-transform-unforgeables": "0.20.0",
-        "@lwc/babel-plugin-component": "6.3.4",
-        "@lwc/errors": "6.3.4",
-        "@lwc/shared": "6.3.4",
-        "@lwc/style-compiler": "6.3.4",
-        "@lwc/template-compiler": "6.3.4"
+        "@lwc/babel-plugin-component": "6.4.0",
+        "@lwc/errors": "6.4.0",
+        "@lwc/shared": "6.4.0",
+        "@lwc/style-compiler": "6.4.0",
+        "@lwc/template-compiler": "6.4.0"
     }
 }

packages/@lwc/engine-core/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/engine-core",
-    "version": "6.3.4",
+    "version": "6.4.0",
     "description": "Core LWC engine APIs.",
     "keywords": [
         "lwc"
@@ -42,11 +42,11 @@
         }
     },
     "dependencies": {
-        "@lwc/features": "6.3.4",
-        "@lwc/shared": "6.3.4"
+        "@lwc/features": "6.4.0",
+        "@lwc/shared": "6.4.0",
+        "@lwc/signals": "6.4.0"
     },
     "devDependencies": {
-        "observable-membrane": "2.0.0",
-        "@lwc/signals": "6.3.4"
+        "observable-membrane": "2.0.0"
     }
 }

packages/@lwc/engine-core/src/framework/api.ts

@@ -35,7 +35,9 @@ import { RenderMode, ShadowMode, SlotSet, VM } from './vm';
 import { LightningElementConstructor } from './base-lightning-element';
 import { markAsDynamicChildren } from './rendering';
 import {
+    isVBaseElement,
     isVScopedSlotFragment,
+    isVStatic,
     Key,
     VComment,
     VCustomElement,
@@ -47,11 +49,10 @@ import {
     VNodeType,
     VScopedSlotFragment,
     VStatic,
-    VText,
     VStaticPart,
     VStaticPartData,
-    isVBaseElement,
-    isVStatic,
+    VStaticPartType,
+    VText,
 } from './vnodes';
 import { getComponentRegisteredName } from './component';
 
@@ -62,10 +63,14 @@ function addVNodeToChildLWC(vnode: VCustomElement) {
 }
 
 // [s]tatic [p]art
-function sp(partId: number, data: VStaticPartData): VStaticPart {
+function sp(partId: number, data: VStaticPartData | null, text: string | null): VStaticPart {
+    // Static part will always have either text or data, it's guaranteed by the compiler.
+    const type = isNull(text) ? VStaticPartType.Element : VStaticPartType.Text;
     return {
+        type,
         partId,
         data,
+        text,
         elm: undefined, // elm is defined later
     };
 }
@@ -84,8 +89,13 @@ function ssf(slotName: unknown, factory: (value: any, key: any) => VFragment): V
 }
 
 // [st]atic node
-function st(fragment: Element, key: Key, parts?: VStaticPart[]): VStatic {
+function st(
+    fragmentFactory: (parts?: VStaticPart[]) => Element,
+    key: Key,
+    parts?: VStaticPart[]
+): VStatic {
     const owner = getVMBeingRendered()!;
+    const fragment = fragmentFactory(parts);
     const vnode: VStatic = {
         type: VNodeType.Static,
         sel: undefined,
@@ -144,12 +154,7 @@ function h(sel: string, data: VElementData, children: VNodes = EmptyArray): VEle
             data.styleDecls && data.style,
             `vnode.data.styleDecls and vnode.data.style ambiguous declaration.`
         );
-        if (data.style && !isString(data.style)) {
-            logError(
-                `Invalid 'style' attribute passed to <${sel}> is ignored. This attribute must be a string value.`,
-                vmBeingRendered
-            );
-        }
+
         forEach.call(children, (childVnode: VNode | null | undefined) => {
             if (childVnode != null) {
                 assert.isTrue(
@@ -377,7 +382,7 @@ function i(
     const list: VNodes = [];
     // TODO [#1276]: compiler should give us some sort of indicator when a vnodes collection is dynamic
     sc(list);
-    const vmBeingRendered = getVMBeingRendered();
+    const vmBeingRendered = getVMBeingRendered()!;
     if (isUndefined(iterable) || iterable === null) {
         if (process.env.NODE_ENV !== 'production') {
             logError(
@@ -432,15 +437,18 @@ function i(
         if (process.env.NODE_ENV !== 'production') {
             const vnodes = isArray(vnode) ? vnode : [vnode];
             forEach.call(vnodes, (childVnode: VNode | null) => {
-                if (!isNull(childVnode) && isObject(childVnode) && !isUndefined(childVnode.sel)) {
+                // Check that the child vnode is either an element or VStatic
+                if (!isNull(childVnode) && (isVBaseElement(childVnode) || isVStatic(childVnode))) {
                     const { key } = childVnode;
+                    // In @lwc/engine-server the fragment doesn't have a tagName, default to the VM's tagName.
+                    const { tagName } = vmBeingRendered;
                     if (isString(key) || isNumber(key)) {
                         if (keyMap[key] === 1 && isUndefined(iterationError)) {
-                            iterationError = `Duplicated "key" attribute value for "<${childVnode.sel}>" in ${vmBeingRendered} for item number ${j}. A key with value "${childVnode.key}" appears more than once in the iteration. Key values must be unique numbers or strings.`;
+                            iterationError = `Duplicated "key" attribute value in "<${tagName}>" for item number ${j}. A key with value "${key}" appears more than once in the iteration. Key values must be unique numbers or strings.`;
                         }
                         keyMap[key] = 1;
                     } else if (isUndefined(iterationError)) {
-                        iterationError = `Invalid "key" attribute value in "<${childVnode.sel}>" in ${vmBeingRendered} for item number ${j}. Set a unique "key" value on all iterated child elements.`;
+                        iterationError = `Invalid "key" attribute value in "<${tagName}>" for item number ${j}. Set a unique "key" value on all iterated child elements.`;
                     }
                 }
             });