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Update declaration of ts.Iterator to be compatible with ES2015 IteratorResult type #32890

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#41507
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Update declaration of ts.Iterator to be compatible with ES2015 IteratorResult type#32890
#41507
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rbuckton
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Fix AvailableA PR has been opened for this issueA PR has been opened for this issueNeeds InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.RescheduledThis issue was previously scheduled to an earlier milestoneThis issue was previously scheduled to an earlier milestone
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TypeScript 4.1.0

Description

@ajafff
ajafff
opened on Aug 14, 2019
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This is the same issue as #31214 as that one was closed even though the error still exists in the most recent nightly build.

TypeScript Version: 3.6.0-dev.20190814

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I'm trying to use the API changes of #31101, but I run into assignability issues.

// @strict: true
// @target: es2015
import * as ts from 'typescript';
return ts.getParsedCommandLineOfConfigFile('foo', {}, undefined!, new Map<string, ts.ExtendedConfigCacheEntry>());

Expected behavior:

No type error.

Actual behavior:

Argument of type 'Map<string, ExtendedConfigCacheEntry>' is not assignable to parameter of type 'Map<ExtendedConfigCacheEntry>'.
  Types of property 'keys' are incompatible.
    Type '() => IterableIterator<string>' is not assignable to type '() => Iterator<string>'.
      Type 'IterableIterator<string>' is not assignable to type 'Iterator<string>'.
        Types of property 'next' are incompatible.
          Type '(value?: any) => IteratorResult<string>' is not assignable to type '() => { value: never; done: true; } | { value: string; done: false; }'.
            Type 'IteratorResult<string>' is not assignable to type '{ value: never; done: true; } | { value: string; done: false; }'.
              Type 'IteratorResult<string>' is not assignable to type '{ value: string; done: false; }'.
                Types of property 'done' are incompatible.
                  Type 'boolean' is not assignable to type 'false'.
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