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MIT License
Copyright (c) 2014-present Sebastian McKenzie and other contributors
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# @babel/plugin-transform-react-constant-elements
> Treat React JSX elements as value types and hoist them to the highest scope
See our website [@babel/plugin-transform-react-constant-elements](https://babeljs.io/docs/babel-plugin-transform-react-constant-elements) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-transform-react-constant-elements
```
or using yarn:
```sh
yarn add @babel/plugin-transform-react-constant-elements --dev
```

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _core = require("@babel/core");
var _default = exports.default = (0, _helperPluginUtils.declare)((api, options) => {
api.assertVersion(7);
const {
allowMutablePropsOnTags
} = options;
if (allowMutablePropsOnTags != null && !Array.isArray(allowMutablePropsOnTags)) {
throw new Error(".allowMutablePropsOnTags must be an array, null, or undefined.");
}
const HOISTED = new WeakMap();
function declares(node, scope) {
if (_core.types.isJSXIdentifier(node, {
name: "this"
}) || _core.types.isJSXIdentifier(node, {
name: "arguments"
}) || _core.types.isJSXIdentifier(node, {
name: "super"
}) || _core.types.isJSXIdentifier(node, {
name: "new"
})) {
const {
path
} = scope;
return path.isFunctionParent() && !path.isArrowFunctionExpression();
}
return scope.hasOwnBinding(node.name);
}
function isHoistingScope({
path
}) {
return path.isFunctionParent() || path.isLoop() || path.isProgram();
}
function getHoistingScope(scope) {
while (!isHoistingScope(scope)) scope = scope.parent;
return scope;
}
const targetScopeVisitor = {
ReferencedIdentifier(path, state) {
const {
node
} = path;
let {
scope
} = path;
while (scope !== state.jsxScope) {
if (declares(node, scope)) return;
scope = scope.parent;
}
while (scope) {
if (scope === state.targetScope) return;
if (declares(node, scope)) break;
scope = scope.parent;
}
state.targetScope = getHoistingScope(scope);
}
};
const immutabilityVisitor = {
enter(path, state) {
var _expressionResult$deo;
const stop = () => {
state.isImmutable = false;
path.stop();
};
const skip = () => {
path.skip();
};
if (path.isJSXClosingElement()) {
skip();
return;
}
if (path.isJSXIdentifier({
name: "ref"
}) && path.parentPath.isJSXAttribute({
name: path.node
})) {
stop();
return;
}
if (path.isJSXIdentifier() || path.isJSXMemberExpression() || path.isJSXNamespacedName() || path.isImmutable()) {
return;
}
if (path.isIdentifier()) {
const binding = path.scope.getBinding(path.node.name);
if (binding && binding.constant) return;
}
const {
mutablePropsAllowed
} = state;
if (mutablePropsAllowed && path.isFunction()) {
path.traverse(targetScopeVisitor, state);
skip();
return;
}
if (!path.isPure()) {
stop();
return;
}
const expressionResult = path.evaluate();
if (expressionResult.confident) {
const {
value
} = expressionResult;
if (mutablePropsAllowed || value === null || typeof value !== "object" && typeof value !== "function") {
skip();
return;
}
} else if ((_expressionResult$deo = expressionResult.deopt) != null && _expressionResult$deo.isIdentifier()) {
return;
}
stop();
}
};
const hoistingVisitor = Object.assign({}, immutabilityVisitor, targetScopeVisitor);
return {
name: "transform-react-constant-elements",
visitor: {
JSXElement(path) {
var _jsxScope;
if (HOISTED.has(path.node)) return;
const name = path.node.openingElement.name;
let mutablePropsAllowed = false;
if (allowMutablePropsOnTags != null) {
let lastSegment = name;
while (_core.types.isJSXMemberExpression(lastSegment)) {
lastSegment = lastSegment.property;
}
const elementName = lastSegment.name;
mutablePropsAllowed = allowMutablePropsOnTags.includes(elementName);
}
let jsxScope;
let current = path;
while (!jsxScope && current.parentPath.isJSX()) {
current = current.parentPath;
jsxScope = HOISTED.get(current.node);
}
(_jsxScope = jsxScope) != null ? _jsxScope : jsxScope = path.scope;
HOISTED.set(path.node, jsxScope);
const visitorState = {
isImmutable: true,
mutablePropsAllowed,
jsxScope,
targetScope: path.scope.getProgramParent()
};
path.traverse(hoistingVisitor, visitorState);
if (!visitorState.isImmutable) return;
const {
targetScope
} = visitorState;
for (let currentScope = jsxScope;;) {
if (targetScope === currentScope) return;
if (isHoistingScope(currentScope)) break;
currentScope = currentScope.parent;
if (!currentScope) {
throw new Error("Internal @babel/plugin-transform-react-constant-elements error: " + "targetScope must be an ancestor of jsxScope. " + "This is a Babel bug, please report it.");
}
}
const id = path.scope.generateUidBasedOnNode(name);
targetScope.push({
id: _core.types.identifier(id)
});
HOISTED.set(path.node, targetScope);
let replacement = _core.template.expression.ast`
${_core.types.identifier(id)} || (${_core.types.identifier(id)} = ${path.node})
`;
if (path.parentPath.isJSXElement() || path.parentPath.isJSXAttribute()) {
replacement = _core.types.jsxExpressionContainer(replacement);
}
path.replaceWith(replacement);
}
}
};
});
//# sourceMappingURL=index.js.map

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{
"name": "@babel/plugin-transform-react-constant-elements",
"version": "7.24.1",
"description": "Treat React JSX elements as value types and hoist them to the highest scope",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-transform-react-constant-elements"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-react-constant-elements",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"keywords": [
"babel-plugin"
],
"dependencies": {
"@babel/helper-plugin-utils": "^7.24.0"
},
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "^7.24.1",
"@babel/helper-plugin-test-runner": "^7.24.1"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "commonjs"
}