process.cwd is a function, not a string

[Axure]

istanbuljs/packages/istanbul-lib-source-maps/lib/pathutils.js

Line 12 in ac824a4

return isAbsolute(file) ? file : path.resolve(baseDir || process.cwd, file);

This would possibly cause errors, like:

Path must be a string. Received [Function]
TypeError: Path must be a string. Received [Function]
    at assertPath (path.js:28:11)
    at Object.resolve (path.js:1171:7)