wml writes to node_modules

[eqyiel]

I noticed this because I'm using a package manager that enforces immutability:

~/sync/git/mango-chutney/steptember-app react-native-camera-update*
❯ wml add /Users/rkm/sync/git/mango-chutney/steptember-app/../react-native-camera node_modules/react-native-camera
? Source folder is a git repo, add `.git` to ignored folders? Yes
? Source folder is an npm package, add `node_modules` to ignored folders? Yes
(node:23530) UnhandledPromiseRejectionWarning: Error: EACCES: permission denied, open '/nix/store/7bymhck9yazwcabmmxj7d9ihmfid4f6y-node-wml-0.0.83/lib/node_modules/wml/src/links.json'
    at Object.fs.openSync (fs.js:660:18)
    at Object.fs.writeFileSync (fs.js:1319:33)
    at Object.writeFileSync (/nix/store/7bymhck9yazwcabmmxj7d9ihmfid4f6y-node-wml-0.0.83/lib/node_modules/wml/node_modules/jsonfile/index.js:115:13)
    at Object.outputJsonSync (/nix/store/7bymhck9yazwcabmmxj7d9ihmfid4f6y-node-wml-0.0.83/lib/node_modules/wml/node_modules/fs-extra/lib/json/output-json-sync.js:13:12)
    at Object.module.exports.save (/nix/store/7bymhck9yazwcabmmxj7d9ihmfid4f6y-node-wml-0.0.83/lib/node_modules/wml/src/links.js:23:5)
    at promptForIgnoredFolders.then (/nix/store/7bymhck9yazwcabmmxj7d9ihmfid4f6y-node-wml-0.0.83/lib/node_modules/wml/src/cli/add.js:111:9)
    at <anonymous>
(node:23530) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either
by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:23530) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I can work around it by installing wml per-project and using $(npm bin)/wml, but it still feels kind of dirty because the content of node_modules isn't meant to change like that.

It might be good to use something like this or to write to a user-defined location like WML_TEMP_DIR="$(pwd)"; wml add ...