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The process of parsing a KML file to obtain points, polylines, and polygons simultaneously in TypeScript typically involves the following steps:

1. Read the KML file using a FileReader to obtain the file content as a string.
2. Convert the KML string to an XML DOM object using the DOMParser.
3. Traverse the XML DOM object to extract the desired geometries (points, polylines, and polygons) by searching for the appropriate tags and attributes.
4. For each geometry, extract its coordinates, which are typically represented as a string of comma-separated values, and convert them to a list of [latitude, longitude] pairs using the split() method and the parseFloat() function.
5. Store the extracted geometries and their coordinates in data structures (e.g., arrays or objects) that can be used to visualize them on a map or manipulate them in other ways.

Overall, the process of parsing a KML file to obtain points, polylines, and polygons simultaneously in TypeScript requires a combination of string manipulation, XML parsing, and data structure manipulation skills.