README.md

date-fns-codemod

Usage

npx @date-fns/upgrade-codemod <path> [...options]

• path files or directory to transform
• --dry option for a dry-run
• --print option to print the output for comparison

Example

npx @date-fns/upgrade-codemod src/

Codemods applied

N.B. At the moment this codemod applies fixes ONLY for first 3 points of 2.0 date-fns CHANGELOG
You'll have to take care of all the other breaking changes.

Codemod imports required tools from @date-fns/upgrade (you will have to add it as dependency in your project if required) and wraps date-fns function call arguments accordingly.

+import { legacyParse, legacyParseMap, convertTokens } from '@date-fns/upgrade/v2'

 const dateIs = '2019-07-01'

 const someToken = 'MM-DD';
-const format = importedFormat('2019-07-01', someToken)
-const closestIndex = closestToIndex(new Date(2015, 8, 6), [
-  new Date(2015, 0, 1),
-  new Date(2016, 0, 1),
-  new Date(2017, 0, 1)
-])
-const addSecondsPlease = addSeconds(dateIs, 999)
-const isoDay = getThatDay(new Date())
+const format = importedFormat(
+  legacyParse('2019-07-01'),
+  convertTokens(someToken)
+)
+const closestIndex = closestToIndex(
+  legacyParse(new Date(2015, 8, 6)),
+  legacyParseMap([
+    new Date(2015, 0, 1),
+    new Date(2016, 0, 1),
+    new Date(2017, 0, 1)
+  ])
+)
+const addSecondsPlease = addSeconds(legacyParse(dateIs), 999)
+const isoDay = getThatDay(legacyParse(new Date()))

Codemod also changes import locations

 import * as importedFormat from 'date-fns/format'
-import closestToIndex from 'date-fns/closest_to_index'
-import addSeconds from 'date-fns/add_seconds'
-import getThatDay from 'date-fns/get_iso_day'
+import closestToIndex from 'date-fns/closestToIndex'
+import addSeconds from 'date-fns/addSeconds'
+import getThatDay from 'date-fns/getISODay'

PRs welcome!