Recursive collection of file paths in a nested structure

The function takes an object describing a file system and returns an array of strings, where each string is a full path to an individual file. The nesting can be arbitrary, but there is only one directory at each level.

/* input data */
const fileTree = [
  "a.js",
  "b.js",
  {
    src: [
      "some.js",
      "other.js",
      {
        components: ["someComponent.js"],
      },
    ],
  },
];

/*
  Expected result:
  [
   'a.js',
   'b.js',
   'src/some.js',
   'src/other.js',
   'src/components/someComponent.js'
  ]
*/

const collectPaths = (arr) => {

};

console.log(collectPaths(fileTree));