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map: {+sourceRoot?: ?string, ...},
): string {
const {sourceRoot} = map;
let source = sourceInput;
source = String(source);
// Some source maps produce relative source paths like "./foo.js" instead of
// "foo.js". Normalize these first so that future comparisons will succeed.
// See bugzil.la/1090768.
source = util.normalize(source);
// Always ensure that absolute sources are internally stored relative to
// the source root, if the source root is absolute. Not doing this would
// be particularly problematic when the source root is a prefix of the
// source (valid, but why??). See github issue #199 and bugzil.la/1188982.
source =
sourceRoot != null && util.isAbsolute(sourceRoot) && util.isAbsolute(source)
? util.relative(sourceRoot, source)
: source;
return source;
}