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bug with never type #32176

Closed

LongTengDao opened this issue Jun 29, 2019 · 1 comment

Contributor

LongTengDao commented Jun 29, 2019 •

edited

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TypeScript Version: 3.4.0-dev.201xxxxx

Search Terms:

Code

function assertString (value :any) :string {
    if ( typeof value==='string' ) { return value; }
    throwError();
}

function throwError () :never {
    throw Error();
}

Expected behavior:

no warning

Actual behavior:

warn except do like this:

function assertString (value :string) :string {
    if ( typeof value==='string' ) { return value; }
    throw throwError();
}

or:

function assertString (value :string) :string {
    if ( typeof value==='string' ) { return value; }
    return throwError();
}

Playground Link:

Related Issues:

nattthebear commented Jun 29, 2019

Duplicate of #28859

LongTengDao closed this as completed

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