Target ES2022 for Node.js packages (#5931)

* build!: target ES2022 for Node packages

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8ebd5bf2-c44b-42d5-be25-e7936d4b0a14

* fix: handle ES2022 compiler semantics

Keep Webpack 4 fixtures on ES2019 because its parser cannot consume
nullish coalescing emitted by ES2022 targets.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8ebd5bf2-c44b-42d5-be25-e7936d4b0a14

* fix: declare inherited scenario property

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8ebd5bf2-c44b-42d5-be25-e7936d4b0a14

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8ebd5bf2-c44b-42d5-be25-e7936d4b0a14

Author: bmiddha

apps/api-documenter/src/plugin/MarkdownDocumenterFeature.ts

@@ -75,7 +75,7 @@ const uuidMarkdownDocumenterFeature: string = '34196154-9eb3-4de0-a8c8-7e9539dfe
  */
 export class MarkdownDocumenterFeature extends PluginFeature {
   /** {@inheritdoc PluginFeature.context} */
-  public override context!: MarkdownDocumenterFeatureContext;
+  public declare context: MarkdownDocumenterFeatureContext;
 
   /**
    * This event occurs before each markdown file is written.  It provides an opportunity to customize the

build-tests/api-documenter-scenarios/src/inheritedMembers/index.ts

@@ -48,7 +48,7 @@ export class Class2<T> extends Namespace1.Class3 {
 export class Class1 extends Class2<number> {
   /** A second prop. Overrides `Class2.secondProp`. */
   // eslint-disable-next-line @typescript-eslint/explicit-member-accessibility
-  override secondProp: boolean;
+  declare secondProp: boolean;
 
   /** A fourth prop */
   // eslint-disable-next-line @typescript-eslint/explicit-member-accessibility

build-tests/localization-plugin-test-01/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "./node_modules/local-node-rig/profiles/default/tsconfig-base.json",
   "compilerOptions": {
+    "target": "ES2019",
     "moduleResolution": "node",
     "rootDirs": ["src", "temp/loc-json-ts"]
   }

build-tests/localization-plugin-test-02/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "./node_modules/local-node-rig/profiles/default/tsconfig-base.json",
   "compilerOptions": {
+    "target": "ES2019",
     "moduleResolution": "node",
     "rootDirs": ["src", "temp/loc-json-ts"]
   }

build-tests/localization-plugin-test-03/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "./node_modules/local-node-rig/profiles/default/tsconfig-base.json",
   "compilerOptions": {
+    "target": "ES2019",
     "module": "esnext",
     "outDir": "lib-esm",
     "declarationDir": "lib-dts",

common/changes/@microsoft/rush/es2022-compiler-baseline_2026-08-18-03-14-04.json

@@ -0,0 +1,9 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Update class field declarations for ES2022 emit semantics.",
+      "type": "none"
+    }
+  ]
+}

common/changes/@rushstack/eslint-plugin/es2022-compiler-baseline_2026-08-18-03-14-04.json

@@ -0,0 +1,9 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/eslint-plugin",
+      "comment": "Compile package output for ES2022.",
+      "type": "patch"
+    }
+  ]
+}

common/changes/@rushstack/heft-jest-plugin/es2022-compiler-baseline_2026-08-18-03-14-04.json

@@ -0,0 +1,9 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/heft-jest-plugin",
+      "comment": "Compile package output for ES2022.",
+      "type": "patch"
+    }
+  ]
+}

common/changes/@rushstack/heft-typescript-plugin/es2022-compiler-baseline_2026-08-18-03-14-04.json

@@ -0,0 +1,9 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/heft-typescript-plugin",
+      "comment": "Use ES2022 library definitions during TypeScript compilation.",
+      "type": "patch"
+    }
+  ]
+}

common/changes/@rushstack/localization-utilities/es2022-compiler-baseline_2026-08-18-03-14-04.json

@@ -0,0 +1,9 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/localization-utilities",
+      "comment": "Compile package output for ES2022.",
+      "type": "patch"
+    }
+  ]
+}