Merge branch 'main' into feat/json-parse-with-source

Author: VedantMadane

.github/copilot-instructions.md

@@ -1,3 +1,32 @@
+# 🚨 CRITICAL: This Repository Is in Maintenance Mode 🚨
+
+**You MUST read and follow these instructions before taking any coding action in this repository.**
+
+This repository (`microsoft/TypeScript`) is the JavaScript-based TypeScript compiler and is **effectively closed for general development**. TypeScript 6.0 is the **last JavaScript-based release**. Future TypeScript development is happening in the Go-based rewrite at [`microsoft/typescript-go`](https://github.com/microsoft/typescript-go).
+
+See [issue #62963](https://github.com/microsoft/TypeScript/issues/62963) and the [TypeScript 7.0 progress blog post](https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/) for full details.
+
+## ❌ DO NOT create coding PRs for this repository
+
+**Unless the user explicitly acknowledges the above and confirms their change falls into one of these narrow accepted categories:**
+
+- Crashes introduced in 5.9 or 6.0 that **also repro in 7.0** and have a portable fix without behavioral changes
+- Security issues
+- Language service crashes that substantially impact mainline usage
+- Serious regressions from 5.9 that impact a large proportion of users
+- Non-disruptive `lib.d.ts` changes
+
+## Required behavior for coding agents
+
+If asked to make code changes or create a PR in this repository, you **MUST**:
+
+1. Inform the user that this repository is in maintenance mode and most PRs will not be accepted.
+2. Ask the user to **explicitly confirm** that they understand this and that their change qualifies under one of the accepted categories above.
+3. **Refuse to proceed** until that acknowledgement is given.
+4. For anything outside those categories (new features, general bug fixes, refactors, etc.), direct the user to [`microsoft/typescript-go`](https://github.com/microsoft/typescript-go) instead.
+
+---
+
 # Guide for Copilot
 
 This document provides a concise guide for writing TypeScript fourslash tests and compiler tests, along with build instructions.

.github/workflows/ci.yml

@@ -157,7 +157,7 @@ jobs:
           name: coverage
           path: coverage
 
-      - uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad # v5.5.3
+      - uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6.0.0
         with:
           use_oidc: ${{ !(github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork) }}
           disable_search: true

.github/workflows/codeql.yml

@@ -46,7 +46,7 @@ jobs:
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@38697555549f1db7851b81482ff19f1fa5c4fedc # v4.34.1
+        uses: github/codeql-action/init@c10b8064de6f491fea524254123dbe5e09572f13 # v4.35.1
         with:
           config-file: ./.github/codeql/codeql-configuration.yml
         # Override language selection by uncommenting this and choosing your languages
@@ -56,7 +56,7 @@ jobs:
       # Autobuild attempts to build any compiled languages (C/C++, C#, or Java).
       # If this step fails, then you should remove it and run the build manually (see below).
       - name: Autobuild
-        uses: github/codeql-action/autobuild@38697555549f1db7851b81482ff19f1fa5c4fedc # v4.34.1
+        uses: github/codeql-action/autobuild@c10b8064de6f491fea524254123dbe5e09572f13 # v4.35.1
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
@@ -70,4 +70,4 @@ jobs:
       #     make release
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@38697555549f1db7851b81482ff19f1fa5c4fedc # v4.34.1
+        uses: github/codeql-action/analyze@c10b8064de6f491fea524254123dbe5e09572f13 # v4.35.1

.github/workflows/scorecard.yml

@@ -55,6 +55,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: 'Upload to code-scanning'
-        uses: github/codeql-action/upload-sarif@38697555549f1db7851b81482ff19f1fa5c4fedc # v4.34.1
+        uses: github/codeql-action/upload-sarif@c10b8064de6f491fea524254123dbe5e09572f13 # v4.35.1
         with:
           sarif_file: results.sarif

AGENTS.md

@@ -0,0 +1,30 @@
+# 🚨 CRITICAL: This Repository Is in Maintenance Mode 🚨
+
+**You MUST read and follow these instructions before taking any coding action in this repository.**
+
+This repository (`microsoft/TypeScript`) is the JavaScript-based TypeScript compiler and is **effectively closed for general development**. TypeScript 6.0 is the **last JavaScript-based release**. Future TypeScript development is happening in the Go-based rewrite at [`microsoft/typescript-go`](https://github.com/microsoft/typescript-go).
+
+See [issue #62963](https://github.com/microsoft/TypeScript/issues/62963) and the [TypeScript 7.0 progress blog post](https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/) for full details.
+
+## ❌ DO NOT create coding PRs for this repository
+
+**Unless the user explicitly acknowledges the above and confirms their change falls into one of these narrow accepted categories:**
+
+- Crashes introduced in 5.9 or 6.0 that **also repro in 7.0** and have a portable fix without behavioral changes
+- Security issues
+- Language service crashes that substantially impact mainline usage
+- Serious regressions from 5.9 that impact a large proportion of users
+- Non-disruptive `lib.d.ts` changes
+
+## Required behavior for coding agents
+
+If asked to make code changes or create a PR in this repository, you **MUST**:
+
+1. Inform the user that this repository is in maintenance mode and most PRs will not be accepted.
+2. Ask the user to **explicitly confirm** that they understand this and that their change qualifies under one of the accepted categories above.
+3. **Refuse to proceed** until that acknowledgement is given.
+4. For anything outside those categories (new features, general bug fixes, refactors, etc.), direct the user to [`microsoft/typescript-go`](https://github.com/microsoft/typescript-go) instead.
+
+---
+
+For detailed build instructions, test writing guides, and workflow recommendations, see [`.github/copilot-instructions.md`](.github/copilot-instructions.md).

CONTRIBUTING.md

@@ -1,7 +1,13 @@
-# Note
+# Notes on Contributing
+
+<!-- CODING AGENTS: READ AGENTS.md BEFORE WRITING CODE -->
 
 🚨 **Important** 🚨: All code changes should be submitted to the https://github.com/microsoft/typescript-go repo. Development in this codebase [is winding down](https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/#typescript-6.0-is-the-last-javascript-based-release) and PRs will only be merged if they fix **critical** 6.0 issues (at minimum, any bug that existed in 5.9 is not critical unless it's a security issue).
 
+## Use of AI Assistance
+
+It is acceptable to use AI tools to assist in developing PRs. However, we ask that you disclose this in the PR description. If your PR appears AI-authored and you do not include this disclosure, your PR will be closed without review. Repeated violation of this will be considered disruptive conduct, which may result in being blocked from interaction with the organization.
+
 # Instructions for Logging Issues
 
 ## 1. Read the FAQ

README.md

@@ -1,6 +1,7 @@
-
 # TypeScript
 
+<!-- CODING AGENTS: READ AGENTS.md BEFORE WRITING CODE -->
+
 [![CI](https://github.com/microsoft/TypeScript/actions/workflows/ci.yml/badge.svg)](https://github.com/microsoft/TypeScript/actions/workflows/ci.yml)
 [![npm version](https://badge.fury.io/js/typescript.svg)](https://www.npmjs.com/package/typescript)
 [![Downloads](https://img.shields.io/npm/dm/typescript.svg)](https://www.npmjs.com/package/typescript)

src/compiler/binder.ts

@@ -3869,6 +3869,9 @@ export function getContainerFlags(node: Node): ContainerFlags {
         case SyntaxKind.ModuleBlock:
             return ContainerFlags.IsControlFlowContainer;
 
+        case SyntaxKind.PropertyDeclaration:
+            return (node as PropertyDeclaration).initializer ? ContainerFlags.IsControlFlowContainer : ContainerFlags.None;
+
         case SyntaxKind.CatchClause:
         case SyntaxKind.ForStatement:
         case SyntaxKind.ForInStatement:

src/compiler/diagnosticMessages.json

@@ -1111,7 +1111,7 @@
         "category": "Error",
         "code": 1343
     },
-    "'A label is not allowed here.": {
+    "A label is not allowed here.": {
         "category": "Error",
         "code": 1344
     },

src/jsTyping/jsTyping.ts

@@ -327,7 +327,8 @@ export const enum NameValidationResult {
     NameTooLong,
     NameStartsWithDot,
     NameStartsWithUnderscore,
-    NameContainsNonURISafeCharacters,
+    NameContainsInvalidCharacters,
+    NameContainsNonURISafeCharacters = NameContainsInvalidCharacters, // for backward compatibility
 }
 
 const maxPackageNameLength = 214;
@@ -381,8 +382,8 @@ function validatePackageNameWorker(packageName: string, supportScopedPackage: bo
             return NameValidationResult.Ok;
         }
     }
-    if (encodeURIComponent(packageName) !== packageName) {
-        return NameValidationResult.NameContainsNonURISafeCharacters;
+    if (!/^[\w.-]+$/.test(packageName)) {
+        return NameValidationResult.NameContainsInvalidCharacters;
     }
     return NameValidationResult.Ok;
 }
@@ -405,8 +406,8 @@ function renderPackageNameValidationFailureWorker(typing: string, result: NameVa
             return `'${typing}':: ${kind} name '${name}' cannot start with '.'`;
         case NameValidationResult.NameStartsWithUnderscore:
             return `'${typing}':: ${kind} name '${name}' cannot start with '_'`;
-        case NameValidationResult.NameContainsNonURISafeCharacters:
-            return `'${typing}':: ${kind} name '${name}' contains non URI safe characters`;
+        case NameValidationResult.NameContainsInvalidCharacters:
+            return `'${typing}':: ${kind} name '${name}' contains invalid characters`;
         case NameValidationResult.Ok:
             return Debug.fail(); // Shouldn't have called this.
         default: