microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2026-05-15 12:51:30 -05:00
Code Issues Packages Projects Releases 212 Wiki Activity

Match control flow logic for switch statements to conditional expressions

Browse Source
This commit is contained in:
Anders Hejlsberg
2019-01-24 09:30:36 -08:00
parent 3a2f6a3ed1
commit 9844436231
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/compiler/checker.ts
View File

@@ -15780,9 +15780,6 @@ namespace ts {
function getTypeAtSwitchClause(flow: FlowSwitchClause): FlowType {
const expr = flow.switchStatement.expression;
if (containsMatchingReferenceDiscriminant(reference, expr)) {
return declaredType;
}
const flowType = getTypeAtFlowNode(flow.antecedent);
let type = getTypeFromFlowType(flowType);
if (isMatchingReference(reference, expr)) {
@@ -15797,6 +15794,9 @@ namespace ts {
else if (expr.kind === SyntaxKind.TypeOfExpression && isMatchingReference(reference, (expr as TypeOfExpression).expression)) {
type = narrowBySwitchOnTypeOf(type, flow.switchStatement, flow.clauseStart, flow.clauseEnd);
}
else if (containsMatchingReferenceDiscriminant(reference, expr)) {
type = declaredType;
}
return createFlowType(type, isIncomplete(flowType));
}