It appears that the repository has undergone several changes and renamings:

backend/node_modules/autoprefixer/lib/brackets.js

@@ -1,51 +0,0 @@
-function last(array) {
-  return array[array.length - 1]
-}
-
-let brackets = {
-  /**
-   * Parse string to nodes tree
-   */
-  parse(str) {
-    let current = ['']
-    let stack = [current]
-
-    for (let sym of str) {
-      if (sym === '(') {
-        current = ['']
-        last(stack).push(current)
-        stack.push(current)
-        continue
-      }
-
-      if (sym === ')') {
-        stack.pop()
-        current = last(stack)
-        current.push('')
-        continue
-      }
-
-      current[current.length - 1] += sym
-    }
-
-    return stack[0]
-  },
-
-  /**
-   * Generate output string by nodes tree
-   */
-  stringify(ast) {
-    let result = ''
-    for (let i of ast) {
-      if (typeof i === 'object') {
-        result += `(${brackets.stringify(i)})`
-        continue
-      }
-
-      result += i
-    }
-    return result
-  }
-}
-
-module.exports = brackets