Function getDefaultedExpandoInitializer

test/fixtures/snapshot/typescript.js:16488–16495

* A defaulted expando initializer matches the pattern * `Lhs = Lhs || ExpandoInitializer` * or `var Lhs = Lhs || ExpandoInitializer` * * The second Lhs is required to be the same as the first except that it may be prefixed with * 'window.', 'global.' or 'self.' The second Lh

(name, initializer, isPrototypeAssignment)

     * 'window.', 'global.' or 'self.' The second Lhs is otherwise ignored by the binder and checker.
     */
    function getDefaultedExpandoInitializer(name, initializer, isPrototypeAssignment) {
        var e = ts.isBinaryExpression(initializer)
            && (initializer.operatorToken.kind === 56 /* SyntaxKind.BarBarToken */ || initializer.operatorToken.kind === 60 /* SyntaxKind.QuestionQuestionToken */)
            && getExpandoInitializer(initializer.right, isPrototypeAssignment);
        if (e && isSameEntityName(name, initializer.left)) {
            return e;
        }
    }
    function isDefaultedExpandoInitializer(node) {
        var name = ts.isVariableDeclaration(node.parent) ? node.parent.name :
            ts.isBinaryExpression(node.parent) && node.parent.operatorToken.kind === 63 /* SyntaxKind.EqualsToken */ ? node.parent.left :