Rest elements in generic tuple · Issue #26113 · microsoft/TypeScript (original) (raw)

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Description

TypeScript Version: 3.1.0-dev.20180801

Search Terms: spread tuple

Code

interface Foo<ArgsT extends any[]> {}

interface Bar<SubArgsT extends any[]> extends Foo<[number, ...SubArgsT]>{ }

Expected behavior: Successful compilation. Array subclasses are not allowed as rest arguments for now, but when it is about generics I expect behavior similar to what is done in #24897

Actual behavior: Failed with TS2574: A rest element type must be an array type.