gistfile1.txt

# Proposed Format

{
...
7.  sources: ["baz.ts", "foo.js", "bar.js"]
...
9.  mediaTypes: ["application/javascript", "application/x.typescript"],
10. sourcesMediaTypes: "CAA",
}

Line 9: A list containing the set of each media type M such that there is a
source whose associated media media type is M in the "sources" property. Media
types must conform to https://www.rfc-editor.org/rfc/rfc6838.txt.

Line 10: A string containing a list of base 64 VLQ encoded integers greater than
or equal to 0 with no separators. The number of integers encoded must not exceed
the length of the "sources" property.

To find a source S's associated media type:

  1. Let sourceIndex be the index of S in the "sources" property.
  2. Let sourcesMediaTypesLength be the number of integers encoded in the
     "sourcesMediaTypes" property.
  3. If sourceIndex >= sourcesMediaTypesLength, let mediaTypeIndex be 0.
  4. Else, let mediaTypeIndex be the integer at sourceIndex in the base 64 VLQ
     encoded "sourcesMediaTypes" property.
  5. If mediaTypeIndex >= the length of the "mediaTypes" property, the return
     value is undefined.
  5. Return the media type at mediaTypeIndex in the "mediaTypes" property.

Note that in the above algorithm, lists of size N are indexed from 0 to N-1.

This should explicitly state that these fields are optional and the second is invalid if the first is not present and that the absence doesn't imply anything.