* Generates a version 3 sourcemap.

* Indicates if the string has been changed.

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* Returns true if the resulting source is empty (disregarding white space).

* Moves the characters from `start` and `end` to `index`.

* Prepends the string with the specified content.

* Same as `s.appendLeft(...)`, except that the inserted content will go *before* any previous appends or prepends at index

* Reset the modified characters from `start` to `end` (of the original string, **not** the generated string).

* Returns a clone of `s`, with all content before the `start` and `end` characters of the original string removed.

* Returns a DataURI containing the sourcemap. Useful for doing this sort of thing: * `generateMap(options?: SourceMapOptions): SourceMap;`

* Removes empty lines from the start and end.