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This commit is contained in:
Dan Vanderkam
2024-02-21 11:44:55 -05:00
parent 0c24ccc049
commit e2684f1289
1 changed files with 10 additions and 7 deletions
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17
src/compiler/checker.ts
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@@ -15462,11 +15462,13 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
signature.resolvedTypePredicate = type && isTypePredicateNode(type) ?
createTypePredicateFromTypePredicateNode(type, signature) :
jsdocPredicate || noTypePredicate;
} else if (signature.declaration && isFunctionLikeDeclaration(signature.declaration) && (!signature.resolvedReturnType || signature.resolvedReturnType === booleanType)) {
const {declaration} = signature;
signature.resolvedTypePredicate = noTypePredicate; // avoid infinite loop
}
else if (signature.declaration && isFunctionLikeDeclaration(signature.declaration) && (!signature.resolvedReturnType || signature.resolvedReturnType === booleanType)) {
const { declaration } = signature;
signature.resolvedTypePredicate = noTypePredicate; // avoid infinite loop
signature.resolvedTypePredicate = getTypePredicateFromBody(declaration, signature) || noTypePredicate;
} else {
}
else {
signature.resolvedTypePredicate = noTypePredicate;
}
}
@@ -37405,7 +37407,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
let singleReturn: Expression | undefined;
if (func.body && func.body.kind !== SyntaxKind.Block) {
singleReturn = func.body; // arrow function
} else {
}
else {
if (functionHasImplicitReturn(func)) return undefined;
const bailedEarly = forEachReturnStatement(func.body as Block, returnStatement => {
@@ -37445,7 +37448,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
}
function checkIfExpressionRefinesParameter(expr: Expression, param: ParameterDeclaration, initType: Type): Type | undefined {
const antecedent = (expr as Expression & {flowNode?: FlowNode}).flowNode ?? { flags: FlowFlags.Start };
const antecedent = (expr as Expression & { flowNode?: FlowNode; }).flowNode ?? { flags: FlowFlags.Start };
const trueCondition: FlowCondition = {
flags: FlowFlags.TrueCondition,
node: expr,
@@ -37462,7 +37465,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
const falseCondition: FlowCondition = {
...trueCondition,
flags: FlowFlags.FalseCondition,
}
};
const falseType = getFlowTypeOfReference(param.name, initType, initType, func, falseCondition);
const candidateFalse = filterType(initType, t => !isTypeSubtypeOf(t, trueType));
if (isTypeIdenticalTo(candidateFalse, falseType)) {