Function checkElementAccessExpression

test/fixtures/snapshot/typescript.js:75230–75247

(node, exprType, checkMode)

            return propagateOptionalTypeMarker(checkElementAccessExpression(node, checkNonNullType(nonOptionalType, node.expression), checkMode), node, nonOptionalType !== exprType);
        }
        function checkElementAccessExpression(node, exprType, checkMode) {
            var objectType = ts.getAssignmentTargetKind(node) !== 0 /* AssignmentKind.None */ || isMethodAccessForCall(node) ? getWidenedType(exprType) : exprType;
            var indexExpression = node.argumentExpression;
            var indexType = checkExpression(indexExpression);
            if (isErrorType(objectType) || objectType === silentNeverType) {
                return objectType;
            }
            if (isConstEnumObjectType(objectType) && !ts.isStringLiteralLike(indexExpression)) {
                error(indexExpression, ts.Diagnostics.A_const_enum_member_can_only_be_accessed_using_a_string_literal);
                return errorType;
            }
            var effectiveIndexType = isForInVariableForNumericPropertyNames(indexExpression) ? numberType : indexType;
            var accessFlags = ts.isAssignmentTarget(node) ?
                4 /* AccessFlags.Writing */ | (isGenericObjectType(objectType) && !ts.isThisTypeParameter(objectType) ? 2 /* AccessFlags.NoIndexSignatures */ : 0) :
                32 /* AccessFlags.ExpressionPosition */;
            var indexedAccessType = getIndexedAccessTypeOrUndefined(objectType, effectiveIndexType, accessFlags, node) || errorType;
            return checkIndexedAccessIndexType(getFlowTypeOfAccessExpression(node, getNodeLinks(node).resolvedSymbol, indexedAccessType, indexExpression, checkMode), node);
        }
        function callLikeExpressionMayHaveTypeArguments(node) {
            return ts.isCallOrNewExpression(node) || ts.isTaggedTemplateExpression(node) || ts.isJsxOpeningLikeElement(node);
        }