Breaking Changes

• change(instance-id): Remove deprecated Instance ID service (#3166)
• change: Remove Deprecated Legacy Namespace Support (#3164)
• change(fcm): Drop legacy messaging types (#3157)
• change: Drop support for Node.js 18 and 20 (v14) (#3138)

New Features

• feat(auth): Enhance emulator support across authentication classes (#3080)
• feat(core): Error Handling Revamp (v14) (#3140)

Bug Fixes

• fix(functions): store CLOUD_TASKS_EMULATOR_HOST at construction time (#3167)
• fix(auth): Decouple CreateRequest interface from UpdateRequest (#3165)
• fix(auth): skip project config name assertion when using the Auth emulator (#3142)
• fix(api-request): replace deprecated url.parse() with WHATWG URL (#3124)
• fix: resolve failing getApplicationDefault unit tests in gcloud SDK environment (#3163)
• fix(fcm): Map topic subscription RESOURCE_EXHAUSTED server code to new TOPICS_SUBSCRIPTION_RATE_EXCEEDED SDK error code (#3148)

Miscellaneous

• [chore] Release 14.0.0 (#3171)
• build: upgrade compilation target and lib to ES2021 (#3172)
• build(deps): bump @tootallnate/once from 2.0.0 to 2.0.1 (#3160)
• build(deps): bump fast-uri from 3.1.0 to 3.1.2 (#3168)
• build(deps): bump fast-xml-builder from 1.1.5 to 1.2.0 (#3169)
• chore: fixed api docs typos and omissions (#3170)
• build(deps-dev): bump eslint from 10.3.0 to 10.4.1 (#3155)
• Merge pull request #3162 from firebase/v14
• chore(deps): bump jwks-rsa to 4.0.1 (#3125)
• fix package.json
• chore: Drop send-tweet and upgrade GitHub Actions (#3158)
• chore: upgrade nock to v14 and fix api-request unit tests (#3153)
• chore: bump eslint to 10.3.0 and migrate to flat config (#3150)
• build(deps-dev): bump sinon from 18.0.1 to 22.0.0 (#3149)
• chore(deps): bump jwks-rsa to 4.0.1 (#3125)
• chore: Upgrade dependencies for v14 (#3137)