World vue 3.1: Migration build allows gradual upgrade

12:10  12 may  2021
12:10  12 may  2021 Source:   t3n.de

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Vue.js ist eine beliebte Alternative zu größeren View-Libraries wie beispielsweise React. © vuejs.org/t3n vuejs.js is a popular alternative to larger view libraries such as React.

as a single upgrade for easier upgrade: The Vue-Core team has published the beta of the new version of the popular web framework. It should be the migration of your projects from version 2.x. Simplify on Vue 3.x.

vue.js, of Underdog among the JavaScript frameworks and the secret favorite of many frontend developers, will soon be available in version 3.1. This so-called migration build should be compatible with VUE 2 - and offers ways to configure this compatibility as needed. This should make developers easier to migrate a VUE 2 app to Vue 3 .

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Per Default will run the migration build in VUE-2 mode, simply for the reason that most - but not all - public APIs behave vue-2-compliant behavior. The downward-compatible mode allows developers to process breaking changes and deprecations one after the other without having to upgrade their projects in a start to Vue 3. For outdated structures or changes, there is a runtime warning in V 3.1.


The whole comes with a number of restrictions. The migration build is intended to cover publicly documented behavior of VUE 2 and its APIs.

• Apps that are based on Vue 2S internal APIs or on undocumented behavior of the releases may not be useful with the migration build. In this case, a corresponding refactoring of the relevant code is recommended.

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• Anyone who gets his application on the migration build to run them before the migration is completely completed in production. This brings with itself a performance overhead that should not affect the UX of the users. For projects that use component libraries such as Vuety, Element UI or Quasar, it is recommended to wait for the publication of a VUE-3-compatible releases.

• Like VUE 3, the migration build does not provide IE11 support. Who needs the need, must leave his app on Vue 2.

• Projects using Server Side Rendering can use VUE 3.1 theoretically. VUE 3, however, does not have a bundle renderer, for Server Side Rendering it is recommended to use the Build Tool Vite from the VUE ecosystem. Anyone who uses the vue.js-framework nuxt.js should better wait for the release of nux 3 before attempting a migration.

TL: Dr: To upgrade large, very complex apps, will also remain a challenge with the migration build. For Q3 in 2021, however, the VUE-Core team plans several features from Vue 3, including the composition API, to Vue 2.7 to backports.

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suitable for this: What is Vue.js

more innovations

In addition, some innovations and performance improvements are included in the release. Underneath a new lifecycle hook for composition API called Onserprefetch and support for compiler options on component level. Also new in 3.1: Via app.config.compilerOptions, developers should be able to configure the Runtime compiler. Last but not least, the Keepalive Support - a Wrapper element for dynamic components has been improved.

V 3.1 is to be developed independently of V 3.2

is published The Migration Build still in the betaphase is released with version 3.1, further revisions should take place in the form of smaller, compacting minor version updates. News that were actually considered for version 3.1 were postponed to version 3.2. The development of the migration builds may want to end the developers at the end of 2021. For developers this means: The migration to the standard build should have completed until then.

experienced developers who have not yet worked with VUE 3 can also use the version according to Readme to the Github project to familiarize themselves with the differences between the two major versions. Further information can be found in the associated Changelog ; In the Github Repository of the project there is a How-to upgrade workflow.

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