* A data structure which is a combination of an array and a set. Adding a new * member is O(1), testing for membership is O(1), and finding the index

* A BasicSourceMapConsumer instance represents a parsed source map which we can * query for information about the original file positions by giving i

* An IndexedSourceMapConsumer instance represents a parsed source map which * we can query for information. It differs from BasicSourceMapConsumer in

* Provide the JIT with a nice shape / hidden class.

* An interop point defined by the es7-observable spec https://github.com/zenparsing/es-observable * @method Symbol.observable * @return {Observa

* Convert a Base64-encoded string into its original representation. * Used for inline sourcemaps. * * @param {String} b64str Base-64 en