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Fix for crash

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This commit is contained in:
navya9singh 2023-01-27 14:12:36 -08:00
parent fc4ac8feca
commit e1b2000e4c
1 changed files with 5 additions and 4 deletions
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9
src/compiler/checker.ts
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@ -34271,7 +34271,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (pos < paramCount) {
return getTypeOfParameter(signature.parameters[pos]);
}
if (signatureHasRestParameter(signature)) {
if (signature.parameters.length !== 0 && signatureHasRestParameter(signature)) {
// We want to return the value undefined for an out of bounds parameter position,
// so we need to check bounds here before calling getIndexedAccessType (which
// otherwise would return the type 'undefined').
@ -34317,7 +34317,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
// latter example, the effective rest type is [...string[], boolean].
function getParameterCount(signature: Signature) {
const length = signature.parameters.length;
if (signatureHasRestParameter(signature)) {
if (length !== 0 && signatureHasRestParameter(signature)) {
const restType = getTypeOfSymbol(signature.parameters[length - 1]);
if (isTupleType(restType)) {
return length + restType.target.fixedLength - (restType.target.hasRestElement ? 0 : 1);
@ -34363,8 +34363,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
}
function hasEffectiveRestParameter(signature: Signature) {
if (signatureHasRestParameter(signature)) {
const restType = getTypeOfSymbol(signature.parameters[signature.parameters.length - 1]);
const length = signature.parameters.length;
if (length !== 0 && signatureHasRestParameter(signature)) {
const restType = getTypeOfSymbol(signature.parameters[length - 1]);
return !isTupleType(restType) || restType.target.hasRestElement;
}
return false;