Function explicitlyInheritsFrom

test/fixtures/snapshot/typescript.js:138528–138547

* Determines if the parent symbol occurs somewhere in the child's ancestry. If the parent symbol * is an interface, determines if some ancestor of the child symbol extends or inherits from it. * Also takes in a cache of previous results which makes this slightly more effici

(symbol, parent, cachedResults, checker)

             * @param cachedResults A map of symbol id pairs (i.e. "child,parent") to booleans indicating previous results
             */
            function explicitlyInheritsFrom(symbol, parent, cachedResults, checker) {
                if (symbol === parent) {
                    return true;
                }
                var key = ts.getSymbolId(symbol) + "," + ts.getSymbolId(parent);
                var cached = cachedResults.get(key);
                if (cached !== undefined) {
                    return cached;
                }
                // Set the key so that we don't infinitely recurse
                cachedResults.set(key, false);
                var inherits = !!symbol.declarations && symbol.declarations.some(function (declaration) {
                    return ts.getAllSuperTypeNodes(declaration).some(function (typeReference) {
                        var type = checker.getTypeAtLocation(typeReference);
                        return !!type && !!type.symbol && explicitlyInheritsFrom(type.symbol, parent, cachedResults, checker);
                    });
                });
                cachedResults.set(key, inherits);
                return inherits;
            }
            function getReferencesForSuperKeyword(superKeyword) {
                var searchSpaceNode = ts.getSuperContainer(superKeyword, /*stopOnFunctions*/ false);
                if (!searchSpaceNode) {