all the methods are individually exportable to reducce the package size

.gitignore

@@ -2,3 +2,5 @@ coverage
 dist
 node_modules
 test/typings.test.js
+yarn.lock
+.idea

package.json

@@ -76,43 +76,44 @@
     }
   },
   "dependencies": {
-    "date-fns": "^1.29.0",
-    "timezone-support": "^1.5.5"
+    "date-fns": "^1.30.1",
+    "timezone-support": "^2.0.2"
   },
   "devDependencies": {
-    "@babel/core": "^7.1.2",
-    "babel-core": "^7.0.0-bridge.0",
-    "babel-jest": "^23.6.0",
+    "@babel/core": "^7.5.4",
+    "@babel/preset-env": "^7.5.4",
+    "@types/jest": "^24.0.15",
+    "babel-jest": "^24.8.0",
     "benchmark": "^2.1.4",
-    "connect": "^3.6.6",
-    "coveralls": "^3.0.2",
+    "connect": "^3.7.0",
+    "coveralls": "^3.0.5",
     "cpy-cli": "^2.0.0",
-    "eslint-config-standard": "^12.0.0",
-    "eslint-plugin-import": "^2.14.0",
-    "eslint-plugin-node": "^7.0.1",
-    "eslint-plugin-promise": "^4.0.1",
+    "eslint-config-standard": "^13.0.1",
+    "eslint-plugin-import": "^2.18.0",
+    "eslint-plugin-node": "^9.1.0",
+    "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.0",
-    "fs-extra": "^7.0.0",
-    "jasmine-core": "^3.2.1",
-    "jest": "^23.6.0",
-    "jsdoc": "^3.5.5",
+    "fs-extra": "^8.1.0",
+    "jasmine-core": "^3.4.0",
+    "jest": "^24.8.0",
+    "jsdoc": "^3.6.2",
     "minami": "^1.2.3",
-    "moment-timezone": "^0.5.21",
-    "npm-run-all": "^4.1.3",
-    "puppeteer": "^1.9.0",
-    "regenerator-runtime": "^0.12.1",
-    "rimraf": "^2.6.2",
-    "rollup": "^0.66.5",
-    "rollup-plugin-babel": "^4.0.3",
-    "rollup-plugin-uglify": "^6.0.0",
-    "semantic-release": "^15.9.17",
-    "serve-static": "^1.13.2",
-    "standard": "^12.0.1",
-    "tiny-glob": "^0.2.2",
-    "travis-deploy-once": "^5.0.9",
-    "tslint": "^5.11.0",
+    "moment-timezone": "^0.5.26",
+    "npm-run-all": "^4.1.5",
+    "puppeteer": "^1.18.1",
+    "regenerator-runtime": "^0.13.2",
+    "rimraf": "^2.6.3",
+    "rollup": "^1.16.7",
+    "rollup-plugin-babel": "^4.3.3",
+    "rollup-plugin-uglify": "^6.0.2",
+    "semantic-release": "^15.13.18",
+    "serve-static": "^1.14.1",
+    "standard": "^13.0.1",
+    "tiny-glob": "^0.2.6",
+    "travis-deploy-once": "^5.0.11",
+    "tslint": "^5.18.0",
     "tslint-config-standard": "^8.0.1",
-    "typescript": "^3.1.2"
+    "typescript": "^3.5.3"
   },
   "keywords": [
     "date-fns",

perf/index.js

@@ -1,7 +1,7 @@
 const { join } = require('path')
 const { promisify } = require('util')
 let { readdir } = require('fs')
-let { exec } = require('child_process')
+const { exec } = require('child_process')
 
 readdir = promisify(readdir)
 
@@ -33,7 +33,7 @@ function runSuite (suite) {
 (async function () {
   try {
     const suites = await listSuites()
-    for (let suite of suites) {
+    for (const suite of suites) {
       await runSuite(suite)
       console.log()
     }

src/convertToLocalTime.d.ts

@@ -5,4 +5,4 @@ interface TimeZoneOptions {
 
 declare function convertToLocalTime (dateInput: DateInput, options: TimeZoneOptions): Date
 
-export { convertToLocalTime }
+export default convertToLocalTime

src/convertToLocalTime.js

@@ -27,11 +27,11 @@ import { findTimeZone, getUTCOffset } from 'timezone-support'
  * // The date will be "2018-09-02T16:00:00Z".
  */
 function convertToLocalTime (argument, options) {
-  let date = parse(argument)
+  const date = parse(argument)
   const timeZone = findTimeZone(options.timeZone)
   let { offset } = getUTCOffset(date, timeZone)
   offset = date.getTimezoneOffset() - offset
   return new Date(date.getTime() - offset * 60 * 1000)
 }
 
-export { convertToLocalTime }
+export default convertToLocalTime

src/convertToTimeZone.d.ts

@@ -3,6 +3,9 @@ interface TimeZoneOptions {
   timeZone: string
 }
 
-declare function convertToTimeZone (dateInput: DateInput, options: TimeZoneOptions): Date
+declare function convertToTimeZone (
+  dateInput: DateInput,
+  options: TimeZoneOptions
+): Date
 
-export { convertToTimeZone }
+export default convertToTimeZone

src/convertToTimeZone.js

@@ -25,11 +25,11 @@ import { findTimeZone, getUTCOffset } from 'timezone-support'
  * Returns { date: Date, zone: { abbreviation: 'EST', offset: -300 }
  */
 function convertToTimeZone (argument, options) {
-  let date = parse(argument)
+  const date = parse(argument)
   const timeZone = findTimeZone(options.timeZone)
   let { offset } = getUTCOffset(date, timeZone)
   offset -= date.getTimezoneOffset()
   return new Date(date.getTime() - offset * 60 * 1000)
 }
 
-export { convertToTimeZone }
+export default convertToTimeZone

src/formatToTimeZone.d.ts

@@ -1,8 +1,10 @@
 type DateInput = string | number | Date
-interface TimeZoneOptions {
+interface FormatOptions {
+  locale?: Object
+}
+interface FormatTimeZoneOptions extends FormatOptions {
   timeZone: string
 }
 
-declare function formatToTimeZone (dateInput: DateInput, format: string, options: TimeZoneOptions): string
-
-export { formatToTimeZone }
+declare function formatToTimeZone (dateInput: DateInput, format: string, options: FormatTimeZoneOptions): string
+export default formatToTimeZone

src/formatToTimeZone.js

@@ -135,10 +135,11 @@ function formatTimeZoneTokens (format, timeZone) {
         return `[${timeZone.abbreviation}]`
       case 'Z':
         return formatTimeZoneOffset(timeZone.offset, ':')
-      default: // 'ZZ'
+      default:
+        // 'ZZ'
         return formatTimeZoneOffset(timeZone.offset, '')
     }
   })
 }
 
-export { formatToTimeZone }
+export default formatToTimeZone

src/index.js

@@ -1,5 +1,13 @@
-export { convertToLocalTime } from './convertToLocalTime'
-export { convertToTimeZone } from './convertToTimeZone'
-export { parseFromString } from './parseFromString'
-export { parseFromTimeZone } from './parseFromTimeZone'
-export { formatToTimeZone } from './formatToTimeZone'
+import convertToLocalTime from './convertToLocalTime'
+import convertToTimeZone from './convertToTimeZone'
+import parseFromString from './parseFromString'
+import parseFromTimeZone from './parseFromTimeZone'
+import formatToTimeZone from './formatToTimeZone'
+
+export {
+  convertToLocalTime,
+  convertToTimeZone,
+  parseFromString,
+  parseFromTimeZone,
+  formatToTimeZone
+}

src/parseFromString.d.ts

@@ -1,3 +1,3 @@
 declare function parseFromString (dateString: string, format: string): Date
 
-export { parseFromString }
+export default parseFromString

src/parseFromString.js

@@ -59,4 +59,4 @@ function parseFromString (dateString, formatString) {
   return convertTimeToDate(time)
 }
 
-export { parseFromString }
+export default parseFromString

src/parseFromTimeZone.d.ts

@@ -5,4 +5,4 @@ interface TimeZoneOptions {
 declare function parseFromTimeZone (dateString: string, format: string, options: TimeZoneOptions): Date
 declare function parseFromTimeZone (dateString: string, options: TimeZoneOptions): Date
 
-export { parseFromTimeZone }
+export default parseFromTimeZone

src/parseFromTimeZone.js

@@ -88,4 +88,4 @@ function parseFromTimeZone (dateString, formatString, options) {
   return new Date(date.getTime() + offset * 60 * 1000)
 }
 
-export { parseFromTimeZone }
+export default parseFromTimeZone

test/convertToLocalTime.test.js

@@ -1,6 +1,6 @@
 /* global describe, it, expect */
 
-import { convertToLocalTime } from '../src/convertToLocalTime'
+import convertToLocalTime from '../src/convertToLocalTime'
 
 describe('convertToLocalTime', () => {
   it('is a function', () => {

test/convertToTimeZone.test.js

@@ -1,6 +1,6 @@
 /* global describe, it, expect */
 
-import { convertToTimeZone } from '../src/convertToTimeZone'
+import convertToTimeZone from '../src/convertToTimeZone'
 
 describe('convertToTimeZone', () => {
   it('is a function', () => {

test/formatToTimeZone.test.js

@@ -1,6 +1,6 @@
 /* global describe, it, expect */
 
-import { formatToTimeZone } from '../src/formatToTimeZone'
+import formatToTimeZone from '../src/formatToTimeZone'
 
 describe('formatToTimeZone', () => {
   it('is a function', () => {
@@ -21,7 +21,10 @@ describe('formatToTimeZone', () => {
     const format = 'MM/DD/YYYY h:mm:ss.SSS A [GMT]ZZ (z)'
     const timeZone = 'Pacific/Honolulu'
     const expectedString = '09/01/2018 6:01:36.386 PM GMT-1000 (HST)'
-    const actualString = formatToTimeZone(date, format, { timeZone, convertTimeZone: false })
+    const actualString = formatToTimeZone(date, format, {
+      timeZone,
+      convertTimeZone: false
+    })
     expect(actualString).toEqual(expectedString)
   })
 })

test/parseFromString.test.js

@@ -1,6 +1,6 @@
 /* global describe, it, expect */
 
-import { parseFromString } from '../src/parseFromString'
+import parseFromString from '../src/parseFromString'
 
 describe('parseFromString', () => {
   it('is a function', () => {

test/parseFromTimeZone.test.js

@@ -1,6 +1,6 @@
 /* global describe, it, expect */
 
-import { parseFromTimeZone } from '../src/parseFromTimeZone'
+import parseFromTimeZone from '../src/parseFromTimeZone'
 
 describe('parseFromTimeZone', () => {
   it('is a function', () => {

test/typings.test.ts

@@ -1,9 +1,11 @@
 import {
-  convertToLocalTime, convertToTimeZone, parseFromString, parseFromTimeZone, formatToTimeZone
+  convertToLocalTime,
+  convertToTimeZone,
+  parseFromString,
+  parseFromTimeZone,
+  formatToTimeZone
 } from '../src'
 
-declare function test (label: string, callback: Function)
-
 test('Type declarations for TypeScript', () => {
   const timestamp = 1538822326765
   const date = new Date(timestamp)