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Revert "Merge pull request #27697 from mattmccutchen/issue-27118"

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This reverts commit 2dfb6202ed, reversing
changes made to bbf559b9c7.
This commit is contained in:
Nathan Shively-Sanders
2019-02-27 11:50:04 -08:00
parent 4718ff8f21
commit aedffe049d
6 changed files with 687 additions and 607 deletions
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9
src/compiler/checker.ts
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@@ -12724,11 +12724,10 @@ namespace ts {
else if (source.flags & TypeFlags.Conditional) {
if (target.flags & TypeFlags.Conditional) {
// Two conditional types 'T1 extends U1 ? X1 : Y1' and 'T2 extends U2 ? X2 : Y2' are related if
// they have the same distributivity, T1 and T2 are identical types, U1 and U2 are identical
// types, X1 is related to X2, and Y1 is related to Y2.
if ((<ConditionalType>source).root.isDistributive === (<ConditionalType>target).root.isDistributive &&
isTypeIdenticalTo((<ConditionalType>source).extendsType, (<ConditionalType>target).extendsType) &&
isTypeIdenticalTo((<ConditionalType>source).checkType, (<ConditionalType>target).checkType)) {
// one of T1 and T2 is related to the other, U1 and U2 are identical types, X1 is related to X2,
// and Y1 is related to Y2.
if (isTypeIdenticalTo((<ConditionalType>source).extendsType, (<ConditionalType>target).extendsType) &&
(isRelatedTo((<ConditionalType>source).checkType, (<ConditionalType>target).checkType) || isRelatedTo((<ConditionalType>target).checkType, (<ConditionalType>source).checkType))) {
if (result = isRelatedTo(getTrueTypeFromConditionalType(<ConditionalType>source), getTrueTypeFromConditionalType(<ConditionalType>target), reportErrors)) {
result &= isRelatedTo(getFalseTypeFromConditionalType(<ConditionalType>source), getFalseTypeFromConditionalType(<ConditionalType>target), reportErrors);
}