getRelativeFilePath(filePath) {
		return path
			.relative(this.cwd, filePath)
			.split(path.sep)
			.join(path.posix.sep);
	}
Returns the relative path of a file to the current working directory.
Always in POSIX format for consistency and interoperability.
@param {string} filePath The file path.
@returns {string} The relative file path.