✓ SANDBOX VERIFIED (95% Confidence)
nodejs
ID: rec_ts50_const_type_parameters_040
TS5.0 Const Type Parameters: use <const T> for immutable literal inference
TypeScript 5.0 introduced const type parameters (<const T>), allowing functions to infer exact literal tuple and object types without 'as const'.
💡 Verified Solution
Add const modifier to type parameters: function parse<const T>(val: T): T.
Patch / Unified Code Diff:
--- old.ts
+++ new.ts
@@ -1,2 +1,2 @@
-function getNames<T extends readonly string[]>(names: T): T
+function getNames<const T extends readonly string[]>(names: T): T
Official Primary Reference:
https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#const-type-parameters
🧪 Sandbox Execution Evidence
Exit Code: 0
Tests Passed: 1 / 1
Confidence: 95%
Protocol: MCP 2026
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