This document outlines our focused tasks for TypeScript 5.6. It minimally indicates intent to investigate tasks or contribute to an implementation. Nothing is set in stone, but we will strive to complete these tasks in a reasonable timeframe.

gantt
    dateFormat  YYYY-MM-DD
    TypeScript 5.5 Stabilization Period : 2024-06-10, 2024-06-18
    TypeScript 5.6 Beta Development : 2024-06-10, 2024-07-20
    TypeScript 5.6 RC Development : 2024-07-20, 2024-08-16
    TypeScript 5.6 Stabilization Period : 2024-08-16, 2024-09-03
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Compiler and Language

• Investigate Strict Callback Analysis
• Stricter TReturn and TNext Types for next() on Iterators
• Checks for Never-Initialized Variables
• ECMAScript Arbitrary Module Identifiers
• Consult type in node_modules/**/package.json in More Module Modes
• Spelling Suggestions for Named Capture Groups
• Investigate skipCheck/noCheck in API and Batch-Mode Compilation
• Build All Projects Under --build Irrespective of Errors
• Investigate Non-Null Assertions in JSDoc
• lib.d.ts Updates

Editor and Language Service

• Investigate Expandable Quick Info/Hover Verbosity
• Region-Prioritized Error Checking
• Investigate Simpler Quick Fix API
• Investigate LSP Support
• Auto-Import on Paste
• Provide Deprecated Diagnostics on Namespaces Declared with module Keyword

Performance

• Investigate and Experiment with Full Monomorphization
• Investigate Wildcard Matching Performance
• Optimize Path Mapping Lookups
• Investigate Deferring TransformFlags Calculation

Website and Docs

• Revisit/Review Handbook and Experiences
• Simplify and Refactor Website for Faster Builds

Infrastructure

• Investigate Provenance or Build Signing
• Experiment with Reduced Repros on Weekly New Error Runs
• Adopt --isolatedDeclarations and Parallelize TypeScript's Build