fix(snapshot-utils): Handle Windows line endings

[martincostello]

Fixes #15799.

Summary

Handle Windows line endings when checking snapshot headers after changes made in #15787.

Test plan

Updated unit tests.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: martincostello / name: Martin Costello (dca739f, 5334958, b6ca89b)

[netlify]

✅ Deploy Preview for jestjs ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	dca739f
🔍 Latest deploy log	https://app.netlify.com/projects/jestjs/deploys/68af0461b71c890008d9c475
😎 Deploy Preview	https://deploy-preview-15800--jestjs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[pkg-pr-new]

Open in StackBlitz

babel-jest

npm i https://pkg.pr.new/babel-jest@15800

babel-plugin-jest-hoist

npm i https://pkg.pr.new/babel-plugin-jest-hoist@15800

babel-preset-jest

npm i https://pkg.pr.new/babel-preset-jest@15800

create-jest

npm i https://pkg.pr.new/create-jest@15800

@jest/diff-sequences

npm i https://pkg.pr.new/@jest/diff-sequences@15800

expect

npm i https://pkg.pr.new/expect@15800

@jest/expect-utils

npm i https://pkg.pr.new/@jest/expect-utils@15800

jest

npm i https://pkg.pr.new/jest@15800

jest-changed-files

npm i https://pkg.pr.new/jest-changed-files@15800

jest-circus

npm i https://pkg.pr.new/jest-circus@15800

jest-cli

npm i https://pkg.pr.new/jest-cli@15800

jest-config

npm i https://pkg.pr.new/jest-config@15800

@jest/console

npm i https://pkg.pr.new/@jest/console@15800

@jest/core

npm i https://pkg.pr.new/@jest/core@15800

@jest/create-cache-key-function

npm i https://pkg.pr.new/@jest/create-cache-key-function@15800

jest-diff

npm i https://pkg.pr.new/jest-diff@15800

jest-docblock

npm i https://pkg.pr.new/jest-docblock@15800

jest-each

npm i https://pkg.pr.new/jest-each@15800

@jest/environment

npm i https://pkg.pr.new/@jest/environment@15800

jest-environment-jsdom

npm i https://pkg.pr.new/jest-environment-jsdom@15800

@jest/environment-jsdom-abstract

npm i https://pkg.pr.new/@jest/environment-jsdom-abstract@15800

jest-environment-node

npm i https://pkg.pr.new/jest-environment-node@15800

@jest/expect

npm i https://pkg.pr.new/@jest/expect@15800

@jest/fake-timers

npm i https://pkg.pr.new/@jest/fake-timers@15800

@jest/get-type

npm i https://pkg.pr.new/@jest/get-type@15800

@jest/globals

npm i https://pkg.pr.new/@jest/globals@15800

jest-haste-map

npm i https://pkg.pr.new/jest-haste-map@15800

jest-jasmine2

npm i https://pkg.pr.new/jest-jasmine2@15800

jest-leak-detector

npm i https://pkg.pr.new/jest-leak-detector@15800

jest-matcher-utils

npm i https://pkg.pr.new/jest-matcher-utils@15800

jest-message-util

npm i https://pkg.pr.new/jest-message-util@15800

jest-mock

npm i https://pkg.pr.new/jest-mock@15800

@jest/pattern

npm i https://pkg.pr.new/@jest/pattern@15800

jest-phabricator

npm i https://pkg.pr.new/jest-phabricator@15800

jest-regex-util

npm i https://pkg.pr.new/jest-regex-util@15800

@jest/reporters

npm i https://pkg.pr.new/@jest/reporters@15800

jest-resolve

npm i https://pkg.pr.new/jest-resolve@15800

jest-resolve-dependencies

npm i https://pkg.pr.new/jest-resolve-dependencies@15800

jest-runner

npm i https://pkg.pr.new/jest-runner@15800

jest-runtime

npm i https://pkg.pr.new/jest-runtime@15800

@jest/schemas

npm i https://pkg.pr.new/@jest/schemas@15800

jest-snapshot

npm i https://pkg.pr.new/jest-snapshot@15800

@jest/snapshot-utils

npm i https://pkg.pr.new/@jest/snapshot-utils@15800

@jest/source-map

npm i https://pkg.pr.new/@jest/source-map@15800

@jest/test-result

npm i https://pkg.pr.new/@jest/test-result@15800

@jest/test-sequencer

npm i https://pkg.pr.new/@jest/test-sequencer@15800

@jest/transform

npm i https://pkg.pr.new/@jest/transform@15800

@jest/types

npm i https://pkg.pr.new/@jest/types@15800

jest-util

npm i https://pkg.pr.new/jest-util@15800

jest-validate

npm i https://pkg.pr.new/jest-validate@15800

jest-watcher

npm i https://pkg.pr.new/jest-watcher@15800

jest-worker

npm i https://pkg.pr.new/jest-worker@15800

pretty-format

npm i https://pkg.pr.new/pretty-format@15800

commit: dca739f

[Copilot]

Pull Request Overview

This PR fixes an issue with Jest snapshot utilities where Windows line endings (CRLF) were not being properly handled when validating snapshot headers. The fix ensures that both Unix (\n) and Windows (\r\n) line endings are correctly recognized.

• Updates the snapshot header regular expression to handle optional carriage returns
• Adds comprehensive test coverage for both Linux and Windows line endings
• Updates changelog to document the fix

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/jest-snapshot-utils/src/utils.ts	Modified regex to handle Windows CRLF line endings
packages/jest-snapshot-utils/src/tests/utils.test.ts	Enhanced test coverage with parameterized tests for both line ending types
CHANGELOG.md	Added changelog entry and fixed formatting inconsistency

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[martincostello]

Looks like the test failures are related to native ESM on Node.js v24 and are unrelated.

[cpojer]

Thanks! Will release 30.1.1 quickly with this fix.