Function findMatchingDiscriminantType

test/fixtures/snapshot/typescript.js:89244–89259

(source, target, isRelatedTo, skipPartial)

        }
        // Keep this up-to-date with the same logic within `getApparentTypeOfContextualType`, since they should behave similarly
        function findMatchingDiscriminantType(source, target, isRelatedTo, skipPartial) {
            if (target.flags & 1048576 /* TypeFlags.Union */ && source.flags & (2097152 /* TypeFlags.Intersection */ | 524288 /* TypeFlags.Object */)) {
                var match = getMatchingUnionConstituentForType(target, source);
                if (match) {
                    return match;
                }
                var sourceProperties = getPropertiesOfType(source);
                if (sourceProperties) {
                    var sourcePropertiesFiltered = findDiscriminantProperties(sourceProperties, target);
                    if (sourcePropertiesFiltered) {
                        return discriminateTypeByDiscriminableItems(target, ts.map(sourcePropertiesFiltered, function (p) { return [function () { return getTypeOfSymbol(p); }, p.escapedName]; }), isRelatedTo, /*defaultValue*/ undefined, skipPartial);
                    }
                }
            }
            return undefined;
        }
    }
    ts.createTypeChecker = createTypeChecker;
    function isNotAccessor(declaration) {