in packages/cli/src/baseline/baseline-engine.ts [147:157]
private safelyCompareStrings(oldString: string | undefined, newString: string | undefined): number {
if (oldString && newString) {
return oldString.localeCompare(newString);
}
if (!oldString && !newString) {
return 0;
}
return oldString ? newComesFirst : oldComesFirst;
}