Require `ns` (no-op if already loaded). Return the symbol if successful,
and `nil` if this fails.

Return a truthy value if the namespace has any vars with `:test` metadata.

Returns true if the namespace matches one of our, or eastwood's,
inlined dependencies.

Returns true if the namespace matches the given prefixes.

Require and return all namespaces validly defined in the current project.

Return all loaded namespaces, except those coming from inlined dependencies.
`filter-regexps` is used to filter out namespaces matching regexps.

Return all loaded namespaces defined in the current project.

Return the path to a file containing namespace `ns`.
`ns` can be a Namespace object or the name of a namespace.

Find all namespaces defined in source paths within the current project.