Function convertSingleIdentifierImport

test/fixtures/snapshot/typescript.js:152455–152499

* Convert `import x = require("x").` * Also: * - Convert `x.default()` to `x()` to handle ES6 default export * - Converts uses like `x.y()` to `y()` and uses a named import.

(name, moduleSpecifier, checker, identifiers, quotePreference)

         * - Converts uses like `x.y()` to `y()` and uses a named import.
         */
        function convertSingleIdentifierImport(name, moduleSpecifier, checker, identifiers, quotePreference) {
            var nameSymbol = checker.getSymbolAtLocation(name);
            // Maps from module property name to name actually used. (The same if there isn't shadowing.)
            var namedBindingsNames = new ts.Map();
            // True if there is some non-property use like `x()` or `f(x)`.
            var needDefaultImport = false;
            var useSitesToUnqualify;
            for (var _i = 0, _a = identifiers.original.get(name.text); _i < _a.length; _i++) {
                var use = _a[_i];
                if (checker.getSymbolAtLocation(use) !== nameSymbol || use === name) {
                    // This was a use of a different symbol with the same name, due to shadowing. Ignore.
                    continue;
                }
                var parent = use.parent;
                if (ts.isPropertyAccessExpression(parent)) {
                    var propertyName = parent.name.text;
                    if (propertyName === "default") {
                        needDefaultImport = true;
                        var importDefaultName = use.getText();
                        (useSitesToUnqualify !== null && useSitesToUnqualify !== void 0 ? useSitesToUnqualify : (useSitesToUnqualify = new ts.Map())).set(parent, ts.factory.createIdentifier(importDefaultName));
                    }
                    else {
                        ts.Debug.assert(parent.expression === use, "Didn't expect expression === use"); // Else shouldn't have been in `collectIdentifiers`
                        var idName = namedBindingsNames.get(propertyName);
                        if (idName === undefined) {
                            idName = makeUniqueName(propertyName, identifiers);
                            namedBindingsNames.set(propertyName, idName);
                        }
                        (useSitesToUnqualify !== null && useSitesToUnqualify !== void 0 ? useSitesToUnqualify : (useSitesToUnqualify = new ts.Map())).set(parent, ts.factory.createIdentifier(idName));
                    }
                }
                else {
                    needDefaultImport = true;
                }
            }
            var namedBindings = namedBindingsNames.size === 0 ? undefined : ts.arrayFrom(ts.mapIterator(namedBindingsNames.entries(), function (_a) {
                var propertyName = _a[0], idName = _a[1];
                return ts.factory.createImportSpecifier(/*isTypeOnly*/ false, propertyName === idName ? undefined : ts.factory.createIdentifier(propertyName), ts.factory.createIdentifier(idName));
            }));
            if (!namedBindings) {
                // If it was unused, ensure that we at least import *something*.
                needDefaultImport = true;
            }
            return convertedImports([ts.makeImport(needDefaultImport ? ts.getSynthesizedDeepClone(name) : undefined, namedBindings, moduleSpecifier, quotePreference)], useSitesToUnqualify);
        }
        // Identifiers helpers
        function makeUniqueName(name, identifiers) {
            while (identifiers.original.has(name) || identifiers.additional.has(name)) {