vuejs/vue

Warn if colon shorthand is used on v-if/v-html/etc.

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#10191 opened on Jun 25, 2019

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 (15 comments) (23 reactions) (0 assignees)TypeScript (209,764 stars) (33,833 forks)batch import
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Description

What problem does this feature solve?

I just spent way too long debugging something really weird until I realized I accidentally wrote :v-if instead of v-if.

A warning when wrongly using shorthands like : on "native" vue attributes could prevent this bad experience easily.

What does the proposed API look like?

:v-if="foo"

--> console.warn("You specified v-bind:/ v-on: or a corresponding shorthand on a Vue attribute like v-if or similar. Usually this does not make sense.)

Contributor guide

Tech stack
vuetypescript
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Familiarity with Vue 2 template compiler
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate Vue 2's template compiler in `src/compiler/` to find where directives are parsed. Look for the handling of `v bind` shorthand (`:`) and how native directives like `v if` are distinguished. Add a warning when a shorthand is used on a directive that does not accept bindings. The warning can be emitted in the parser or codegen phase. Check linked issues and comments for prior discussion on implementation details.