Registry / web-framework / babel-helper-vue-jsx-merge-props

babel-helper-vue-jsx-merge-props

library2.0.3jsnpmunverified

babel-helper-vue-jsx-merge-props is an internal Babel helper package designed to facilitate the merging of props when using JSX syntax within Vue.js applications. Specifically, it handles the transformation of JSX spread attributes into the Vue Virtual DOM's `data` object, ensuring correct aggregation of properties, attributes, and event handlers. This package is a dependency of `@vue/babel-preset-jsx` and `@vue/babel-plugin-transform-vue-jsx` (for Vue 2.x) and is not intended for direct consumption by application developers. The current stable version, as specified, is 2.0.3. Its release cadence is tightly coupled with updates to Vue's JSX transformation tools, primarily for Vue 2.x projects. For Vue 3, `@vue/babel-plugin-jsx` handles JSX transformations and prop merging internally, superseding the need for this helper directly.

web-framework serialization

npm install babel-helper-vue-jsx-merge-props

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-HELPER-VUE-J

babel-helper-vue-jsx-merge-props

web-frameworkjavascriptv2.0.3

Install

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Import

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Disk

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Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

_mergeJSXProps

✓ /* This package is not intended for direct import by end-users. It is internally imported by Babel plugins. */

✗ import _mergeJSXProps from 'babel-helper-vue-jsx-merge-props';

This package is an internal Babel helper and does not expose a public API for direct import and usage by application code. Previous versions sometimes caused issues when build tools attempted a default import, as it historically lacked one.

Illustrates Babel configuration for Vue 2 JSX, showing how this helper enables prop spreading within components, without direct code usage.

/* This package is an internal Babel helper and is not directly used in application code. Instead, it is a dependency of Babel plugins/presets that enable Vue JSX. Below is an example of how you would configure Babel to enable Vue 2 JSX support, which implicitly uses this helper for prop merging. */ // babel.config.js module.exports = { presets: [ // For Vue 2.x projects using JSX ['@vue/babel-preset-jsx', { /* options, e.g., 'compositionAPI': true for Vue 2.7 */ }] // For Vue 3.x, use '@vue/babel-plugin-jsx' instead, which has its own merge logic. ] }; // MyComponent.vue (example using JSX with prop spreading) <script lang="jsx"> import Vue from 'vue'; export default Vue.extend({ props: { baseProps: { type: Object, default: () => ({}) }, extraClass: { type: String, default: '' }, }, render() { const mergedProps = { class: `my-component ${this.extraClass}`, ...this.baseProps }; return ( <div {...mergedProps} onClick={() => console.log('Component clicked with merged props.')} > Hello from JSX Component! </div> ); }, }); </script>

Debug

Known issues

gotchaThis package is an internal Babel helper and is not designed for direct consumption by end-user applications. Attempting to directly import or use its exports in your application code is discouraged and may lead to unexpected behavior or build errors.

fix

Ensure you are using `@vue/babel-preset-jsx` or `@vue/babel-plugin-transform-vue-jsx` (for Vue 2) to handle JSX transformations, which will utilize this helper internally.

affects: >=1.0.0

breakingThis helper is specifically for Vue 2.x JSX transformations. For Vue 3.x applications, you should use `@vue/babel-plugin-jsx` instead, as Vue 3's render function and VNode structure are different, requiring a different JSX transformation approach.

fix

For Vue 3 projects, configure Babel to use `@vue/babel-plugin-jsx`. Remove `@vue/babel-preset-jsx` or `@vue/babel-plugin-transform-vue-jsx` and their dependencies if targeting Vue 3.

affects: >=1.0.0

gotchaThis package requires Babel 7.x or higher to function correctly. Using it with older Babel versions (e.g., Babel 6) will result in incompatibility issues and build failures.

fix

Upgrade your project's Babel dependencies to Babel 7+ to ensure compatibility.

affects: <7.0.0

gotchaPast versions of this package were reported to lack a default export, leading to build errors when tools attempted `import _mergeJSXProps from 'babel-helper-vue-jsx-merge-props'`. While typically handled by the consuming Babel plugin, this could surface as a build issue in specific toolchain configurations.

fix

Ensure your Babel setup for Vue JSX is correctly configured, ideally using `@vue/babel-preset-jsx`. If manually configuring plugins, verify that the `_mergeJSXProps` helper is referenced correctly (e.g., via `require` or named import if applicable) by the plugin using it, rather than expecting a default export.

affects: <2.0.0

gotchaWhen using JSX with TypeScript in Vue CLI, appending `@vue/babel-preset-jsx` to presets may introduce errors due to duplication, as `@vue/cli-plugin-babel/preset` already includes it.

fix

If using Vue CLI, remove redundant `@vue/babel-preset-jsx` entries in `babel.config.js`. Use `<script lang="tsx">` in SFCs to ensure proper TypeScript parsing for JSX.

affects: >=1.0.0

Errors

Common errors & fixes

TypeError: _mergeJSXProps is not a function

This error typically indicates that a Babel transformation or build tool is attempting to import `_mergeJSXProps` as a default export, but the package either doesn't provide one or it's being resolved incorrectly. This was a known issue in older setups.

fix

Verify that your Babel configuration (e.g., `babel.config.js`) for Vue JSX is correctly set up using `@vue/babel-preset-jsx` and that your build tools are resolving modules correctly. This package is an internal helper, and direct `import` statements for `_mergeJSXProps` in user code are not expected.

Error: Plugin 'transform-vue-jsx' cannot be used with Vue 3. Please use '@vue/babel-plugin-jsx' instead.

You are attempting to use the Vue 2.x JSX transformation pipeline (which relies on this helper) in a Vue 3 project.

fix

Update your Babel configuration to use `@vue/babel-plugin-jsx` for Vue 3 projects. This package and its direct consumers (`@vue/babel-preset-jsx`, `@vue/babel-plugin-transform-vue-jsx`) are not compatible with Vue 3.

Cannot find module 'babel-helper-vue-jsx-merge-props' or its corresponding type declarations.

The package is either not installed, or there's an issue with module resolution in your build environment. If seen during a Babel transformation, it indicates the plugin consuming it cannot locate the helper.

fix

Ensure the package is installed as a dependency (`npm install babel-helper-vue-jsx-merge-props` or `yarn add babel-helper-vue-jsx-merge-props`). If this occurs during a build and you're using `@vue/babel-preset-jsx`, ensure all related Vue JSX Babel packages are correctly installed.

Upgrade

Version history

2.0.3latest on npm

Audit

Dependencies

@babel/corerequiredCore dependency for any Babel helper, handles AST manipulation.

@vue/babel-preset-jsxoptionalThis package is an internal helper consumed by the Vue JSX Babel preset for Vue 2.x projects.

@vue/babel-plugin-transform-vue-jsxoptionalThis package is an internal helper consumed by the Vue JSX Babel plugin for Vue 2.x projects.

Agent activity

15 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/vuejs/babel-helper-vue-jsx-merge-props ↗

packagehttps://www.npmjs.com/package/babel-helper-vue-jsx-merge-props ↗