Preparing for TypeScript 7.0 — What TS 6.0 Deprecations Mean
TypeScript 6.0 is the final JavaScript-based release. TypeScript 7.0 will rewrite the compiler in Go for 7-10x compilation speed. Every option deprecated in 6.0 will be hard-removed in 7.0 — there is no escape hatch. Here's how to prepare.
TypeScript 6.0 Migration Checker
Paste your tsconfig.json and instantly see every breaking change, deprecated option, and default shift in TypeScript 6.0. Get a readiness grade, step-by-step fixes, and a corrected config. Supports JSONC (comments & trailing commas).
What changed in TypeScript 6.0?
TypeScript 6.0 is the last JavaScript-based major release before the TypeScript 7.0 Go rewrite. It includes significant breaking changes to compiler defaults, removes legacy module systems, and deprecates options that will be hard-removed in 7.0.
Removed
- target ES3/ES5
- outFile option
- module AMD/UMD/System
- moduleResolution classic
- esModuleInterop: false
Deprecated
- moduleResolution: node
- baseUrl as resolution root
- downlevelIteration
- alwaysStrict: false
- module: none
New Defaults
- strict: true
- target: es2025
- module: esnext
- moduleResolution: bundler
- types: [] (empty)
Build or update your config with the tsconfig.json Visual Builder. All analysis runs client-side — your config never leaves your device.
Why TypeScript is moving to Go
The TypeScript team announced a native Go rewrite to achieve 7-10x faster compilation, dramatically reducing build times for large codebases. The Go compiler (codenamed 'Corsa') will be a full rewrite, not a port. TypeScript 6.0 serves as the transition release, deprecating everything that won't carry forward.
What gets hard-removed in 7.0
Every option deprecated in TS 6.0 becomes a hard error in 7.0 with no escape hatch. This includes: target es3/es5, outFile, downlevelIteration, moduleResolution node/classic, module amd/umd/system/none, baseUrl as resolution root, esModuleInterop: false, allowSyntheticDefaultImports: false, alwaysStrict: false, module Foo {} namespace syntax, and import assertions (assert keyword).
How to prepare today
Run your tsconfig.json through the Migration Checker to identify all issues. Fix errors first (these are already broken in 6.0), then warnings (deprecated but escapable), then info items (no-ops to clean up). Use the "ignoreDeprecations": "6.0" escape hatch only as a temporary measure while you migrate.
Frequently Asked Questions
When will TypeScript 7.0 be released?
TypeScript 7.0 is expected in late 2026 or early 2027. The Go rewrite is already in progress. TypeScript 6.0 was explicitly positioned as the transition release.
Will "ignoreDeprecations" work in TypeScript 7.0?
No. The ignoreDeprecations escape hatch only works in TypeScript 6.0. In 7.0, all deprecated options become hard errors with no workaround.
Will TypeScript 7.0 be backwards compatible?
TypeScript 7.0 aims for language compatibility — valid TS 6.0 code should work. However, all deprecated compiler options and syntax from 6.0 will be removed. The Go rewrite also changes the compiler API, affecting tools that use the TypeScript compiler programmatically.
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