Parse the "mappings" string from a source map.
This is intended to be compiled to WebAssembly and eventually used from the mozilla/source-map library. This is not a general purpose source maps library.
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See CONTRIBUTING.md for hacking.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.