perf(ssr): remove filterProperties (#5101)

Author: nolanlawson

packages/@lwc/ssr-compiler/src/compile-js/generate-markup.ts

@@ -31,19 +31,14 @@ const bGenerateMarkup = esTemplate`
         tagName = tagName ?? ${/*component tag name*/ is.literal};
         attrs = attrs ?? Object.create(null);
         props = props ?? Object.create(null);
-        props = __filterProperties(
-            props,
-            publicFields,
-            privateFields,
-        );
         const instance = new ${/* Component class */ is.identifier}({
             tagName: tagName.toUpperCase(),
         });
 
         __establishContextfulRelationship(contextfulParent, instance);
         ${/*connect wire*/ is.statement}
 
-        instance[__SYMBOL__SET_INTERNALS](props, attrs);
+        instance[__SYMBOL__SET_INTERNALS](props, attrs, publicFields, privateFields);
         instance.isConnected = true;
         if (instance.connectedCallback) {
             __mutationTracker.enable(instance);
@@ -128,7 +123,6 @@ export function addGenerateMarkupFunction(
     program.body.unshift(
         bImportDeclaration({
             fallbackTmpl: '__fallbackTmpl',
-            filterProperties: '__filterProperties',
             hasScopedStaticStylesheets: undefined,
             mutationTracker: '__mutationTracker',
             renderAttrs: '__renderAttrs',

packages/@lwc/ssr-runtime/src/index.ts

@@ -20,7 +20,6 @@ export {
     SYMBOL__SET_INTERNALS,
 } from './lightning-element';
 export { mutationTracker } from './mutation-tracker';
-export { filterProperties } from './reflection';
 export {
     fallbackTmpl,
     fallbackTmplNoYield,

packages/@lwc/ssr-runtime/src/lightning-element.ts

@@ -13,7 +13,17 @@
 // and be located before import statements.
 // /// <reference lib="dom" />
 
-import { assign, defineProperties, hasOwnProperty, StringToLowerCase, toString } from '@lwc/shared';
+import {
+    assign,
+    defineProperties,
+    hasOwnProperty,
+    htmlPropertyToAttribute,
+    isAriaAttribute,
+    keys,
+    REFLECTIVE_GLOBAL_PROPERTY_SET,
+    StringToLowerCase,
+    toString,
+} from '@lwc/shared';
 
 import { ClassList } from './class-list';
 import { mutationTracker } from './mutation-tracker';
@@ -64,10 +74,29 @@ export class LightningElement implements PropsAvailableAtConstruction {
         assign(this, propsAvailableAtConstruction);
     }
 
-    [SYMBOL__SET_INTERNALS](props: Properties, attrs: Attributes) {
+    [SYMBOL__SET_INTERNALS](
+        props: Properties,
+        attrs: Attributes,
+        publicFields: Set<string>,
+        privateFields: Set<string>
+    ) {
         this.#props = props;
         this.#attrs = attrs;
-        assign(this, props);
+
+        // Avoid setting the following types of properties that should not be set:
+        // - Properties that are not public.
+        // - Properties that are not global.
+        // - Properties that are global but are internally overridden.
+        for (const propName of keys(props)) {
+            const attrName = htmlPropertyToAttribute(propName);
+            if (
+                publicFields.has(propName) ||
+                ((REFLECTIVE_GLOBAL_PROPERTY_SET.has(propName) || isAriaAttribute(attrName)) &&
+                    !privateFields.has(propName))
+            ) {
+                (this as any)[propName] = props[propName];
+            }
+        }
     }
 
     get className() {

packages/@lwc/ssr-runtime/src/reflection.ts

@@ -5,45 +5,10 @@
  * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
  */
 
-import {
-    AriaAttrNameToPropNameMap,
-    create,
-    entries,
-    htmlPropertyToAttribute,
-    isAriaAttribute,
-    isNull,
-    keys,
-    REFLECTIVE_GLOBAL_PROPERTY_SET,
-    toString,
-} from '@lwc/shared';
+import { AriaAttrNameToPropNameMap, entries, isNull, toString } from '@lwc/shared';
 
 import type { LightningElement } from './lightning-element';
 
-/**
- * Filters out the following types of properties that should not be set.
- * - Properties that are not public.
- * - Properties that are not global.
- * - Properties that are global but are internally overridden.
- */
-export function filterProperties(
-    props: Record<string, unknown>,
-    publicFields: Set<string>,
-    privateFields: Set<string>
-): Record<string, unknown> {
-    const propsToAssign = create(null);
-    for (const propName of keys(props)) {
-        const attrName = htmlPropertyToAttribute(propName);
-        if (
-            publicFields.has(propName) ||
-            ((REFLECTIVE_GLOBAL_PROPERTY_SET.has(propName) || isAriaAttribute(attrName)) &&
-                !privateFields.has(propName))
-        ) {
-            propsToAssign[propName] = props[propName];
-        }
-    }
-    return propsToAssign;
-}
-
 /**
  * Descriptor for IDL attribute reflections that merely reflect the string, e.g. `title`.
  */