Function declareSymbol

test/fixtures/snapshot/typescript.js:44903–45023

* Declares a Symbol for the node and adds it to symbols. Reports errors for conflicting identifier names. * @param symbolTable - The symbol table which node will be added to. * @param parent - node's parent declaration. * @param node - The declaration to be added to the sy

(symbolTable, parent, node, includes, excludes, isReplaceableByMethod, isComputedName)

         * @param excludes - The flags which node cannot be declared alongside in a symbol table. Used to report forbidden declarations.
         */
        function declareSymbol(symbolTable, parent, node, includes, excludes, isReplaceableByMethod, isComputedName) {
            ts.Debug.assert(isComputedName || !ts.hasDynamicName(node));
            var isDefaultExport = ts.hasSyntacticModifier(node, 512 /* ModifierFlags.Default */) || ts.isExportSpecifier(node) && node.name.escapedText === "default";
            // The exported symbol for an export default function/class node is always named "default"
            var name = isComputedName ? "__computed" /* InternalSymbolName.Computed */
                : isDefaultExport && parent ? "default" /* InternalSymbolName.Default */
                    : getDeclarationName(node);
            var symbol;
            if (name === undefined) {
                symbol = createSymbol(0 /* SymbolFlags.None */, "__missing" /* InternalSymbolName.Missing */);
            }
            else {
                // Check and see if the symbol table already has a symbol with this name.  If not,
                // create a new symbol with this name and add it to the table.  Note that we don't
                // give the new symbol any flags *yet*.  This ensures that it will not conflict
                // with the 'excludes' flags we pass in.
                //
                // If we do get an existing symbol, see if it conflicts with the new symbol we're
                // creating.  For example, a 'var' symbol and a 'class' symbol will conflict within
                // the same symbol table.  If we have a conflict, report the issue on each
                // declaration we have for this symbol, and then create a new symbol for this
                // declaration.
                //
                // Note that when properties declared in Javascript constructors
                // (marked by isReplaceableByMethod) conflict with another symbol, the property loses.
                // Always. This allows the common Javascript pattern of overwriting a prototype method
                // with an bound instance method of the same type: `this.method = this.method.bind(this)`
                //
                // If we created a new symbol, either because we didn't have a symbol with this name
                // in the symbol table, or we conflicted with an existing symbol, then just add this
                // node as the sole declaration of the new symbol.
                //
                // Otherwise, we'll be merging into a compatible existing symbol (for example when
                // you have multiple 'vars' with the same name in the same container).  In this case
                // just add this node into the declarations list of the symbol.
                symbol = symbolTable.get(name);
                if (includes & 2885600 /* SymbolFlags.Classifiable */) {
                    classifiableNames.add(name);
                }
                if (!symbol) {
                    symbolTable.set(name, symbol = createSymbol(0 /* SymbolFlags.None */, name));
                    if (isReplaceableByMethod)
                        symbol.isReplaceableByMethod = true;
                }
                else if (isReplaceableByMethod && !symbol.isReplaceableByMethod) {
                    // A symbol already exists, so don't add this as a declaration.
                    return symbol;
                }
                else if (symbol.flags & excludes) {
                    if (symbol.isReplaceableByMethod) {
                        // Javascript constructor-declared symbols can be discarded in favor of
                        // prototype symbols like methods.
                        symbolTable.set(name, symbol = createSymbol(0 /* SymbolFlags.None */, name));
                    }
                    else if (!(includes & 3 /* SymbolFlags.Variable */ && symbol.flags & 67108864 /* SymbolFlags.Assignment */)) {
                        // Assignment declarations are allowed to merge with variables, no matter what other flags they have.
                        if (ts.isNamedDeclaration(node)) {
                            ts.setParent(node.name, node);