Remove dependency

lib/configuration.js

@@ -10,7 +10,6 @@ var fault = require('fault')
 var xtend = require('xtend')
 var object = require('is-object')
 var string = require('x-is-string')
-var func = require('x-is-function')
 var FindUp = require('./find-up')
 
 module.exports = Config
@@ -202,7 +201,7 @@ function merge(target, raw, val, options) {
  function use(usable, value) {
  if (string(usable)) {
  addModule(usable, value)
- } else if (func(usable)) {
+ } else if (typeof usable === 'function') {
  addPlugin(usable, value)
  } else {
  merge(target, usable, value, options)
@@ -225,7 +224,7 @@ function merge(target, raw, val, options) {
  }
 
  try {
- if (func(res)) {
+ if (typeof res === 'function') {
  addPlugin(res, value)
  } else {
  merge(target, res, value, xtend(options, {root: dirname(fp)}))

lib/file-pipeline/queue.js

@@ -2,7 +2,6 @@
 
 var debug = require('debug')('unified-engine:file-pipeline:queue')
 var stats = require('vfile-statistics')
-var func = require('x-is-function')
 
 module.exports = queue
 
@@ -41,7 +40,7 @@ function queue(context, file, fileSet, next) {
  return
  }
 
- if (func(map[key])) {
+ if (typeof map[key] === 'function') {
  debug('`%s` can be flushed', key)
  } else {
  debug('Interupting flush: `%s` is not finished', key)

lib/find-up.js

@@ -4,7 +4,6 @@ var fs = require('fs')
 var path = require('path')
 var fault = require('fault')
 var debug = require('debug')('unified-engine:find-up')
-var func = require('x-is-function')
 var object = require('is-object')
 
 module.exports = FindUp
@@ -178,7 +177,7 @@ function load(filePath, callback) {
  }
 
  function apply(cb, result) {
- if (object(result) && func(result[0])) {
+ if (object(result) && typeof result[0] === 'function') {
  result.push(cb)
  } else if (result instanceof Error) {
  cb(result)

package.json

@@ -36,7 +36,6 @@
  "unist-util-inspect": "^4.1.2",
  "vfile-reporter": "^5.0.0",
  "vfile-statistics": "^1.1.0",
- "x-is-function": "^1.0.4",
  "x-is-string": "^0.1.0",
  "xtend": "^4.0.1"
  },