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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-object-rest-spread
> Compile object rest and spread to ES5
See our website [@babel/plugin-transform-object-rest-spread](https://babeljs.io/docs/babel-plugin-transform-object-rest-spread) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-transform-object-rest-spread
```
or using yarn:
```sh
yarn add @babel/plugin-transform-object-rest-spread --dev
```

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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var helperPluginUtils = require('@babel/helper-plugin-utils');
var core = require('@babel/core');
var pluginTransformParameters = require('@babel/plugin-transform-parameters');
var helperCompilationTargets = require('@babel/helper-compilation-targets');
var pluginTransformDestructuring = require('@babel/plugin-transform-destructuring');
function shouldStoreRHSInTemporaryVariable(node) {
if (!node) return false;
if (node.type === "ArrayPattern") {
const nonNullElements = node.elements.filter(element => element !== null);
if (nonNullElements.length > 1) return true;else return shouldStoreRHSInTemporaryVariable(nonNullElements[0]);
} else if (node.type === "ObjectPattern") {
const {
properties
} = node;
if (properties.length > 1) return true;else if (properties.length === 0) return false;else {
const firstProperty = properties[0];
if (firstProperty.type === "ObjectProperty") {
return shouldStoreRHSInTemporaryVariable(firstProperty.value);
} else {
return shouldStoreRHSInTemporaryVariable(firstProperty);
}
}
} else if (node.type === "AssignmentPattern") {
return shouldStoreRHSInTemporaryVariable(node.left);
} else if (node.type === "RestElement") {
if (node.argument.type === "Identifier") return true;
return shouldStoreRHSInTemporaryVariable(node.argument);
} else {
return false;
}
}
var compatData = {
"Object.assign": {
chrome: "49",
opera: "36",
edge: "13",
firefox: "36",
safari: "10",
node: "6",
deno: "1",
ios: "10",
samsung: "5",
opera_mobile: "36",
electron: "0.37"
}
};
{
const node = core.types.identifier("a");
const property = core.types.objectProperty(core.types.identifier("key"), node);
const pattern = core.types.objectPattern([property]);
var ZERO_REFS = core.types.isReferenced(node, property, pattern) ? 1 : 0;
}
var index = helperPluginUtils.declare((api, opts) => {
var _api$assumption, _api$assumption2, _api$assumption3, _api$assumption4;
api.assertVersion("^7.0.0-0 || >8.0.0-alpha <8.0.0-beta");
const targets = api.targets();
const supportsObjectAssign = !helperCompilationTargets.isRequired("Object.assign", targets, {
compatData
});
const {
useBuiltIns = supportsObjectAssign,
loose = false
} = opts;
if (typeof loose !== "boolean") {
throw new Error(".loose must be a boolean, or undefined");
}
const ignoreFunctionLength = (_api$assumption = api.assumption("ignoreFunctionLength")) != null ? _api$assumption : loose;
const objectRestNoSymbols = (_api$assumption2 = api.assumption("objectRestNoSymbols")) != null ? _api$assumption2 : loose;
const pureGetters = (_api$assumption3 = api.assumption("pureGetters")) != null ? _api$assumption3 : loose;
const setSpreadProperties = (_api$assumption4 = api.assumption("setSpreadProperties")) != null ? _api$assumption4 : loose;
function getExtendsHelper(file) {
return useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : file.addHelper("extends");
}
function* iterateObjectRestElement(path) {
switch (path.type) {
case "ArrayPattern":
for (const elementPath of path.get("elements")) {
if (elementPath.isRestElement()) {
yield* iterateObjectRestElement(elementPath.get("argument"));
} else {
yield* iterateObjectRestElement(elementPath);
}
}
break;
case "ObjectPattern":
for (const propertyPath of path.get("properties")) {
if (propertyPath.isRestElement()) {
yield propertyPath;
} else {
yield* iterateObjectRestElement(propertyPath.get("value"));
}
}
break;
case "AssignmentPattern":
yield* iterateObjectRestElement(path.get("left"));
break;
}
}
function hasObjectRestElement(path) {
const objectRestPatternIterator = iterateObjectRestElement(path);
return !objectRestPatternIterator.next().done;
}
function visitObjectRestElements(path, visitor) {
for (const restElementPath of iterateObjectRestElement(path)) {
visitor(restElementPath);
}
}
function hasSpread(node) {
for (const prop of node.properties) {
if (core.types.isSpreadElement(prop)) {
return true;
}
}
return false;
}
function extractNormalizedKeys(node) {
const props = node.properties;
const keys = [];
let allPrimitives = true;
let hasTemplateLiteral = false;
for (const prop of props) {
const {
key
} = prop;
if (core.types.isIdentifier(key) && !prop.computed) {
keys.push(core.types.stringLiteral(key.name));
} else if (core.types.isTemplateLiteral(key)) {
keys.push(core.types.cloneNode(key));
hasTemplateLiteral = true;
} else if (core.types.isLiteral(key)) {
keys.push(core.types.stringLiteral(String(key.value)));
} else {
keys.push(core.types.cloneNode(key));
if (core.types.isMemberExpression(key, {
computed: false
}) && core.types.isIdentifier(key.object, {
name: "Symbol"
}) || core.types.isCallExpression(key) && core.types.matchesPattern(key.callee, "Symbol.for")) ; else {
allPrimitives = false;
}
}
}
return {
keys,
allPrimitives,
hasTemplateLiteral
};
}
function replaceImpureComputedKeys(properties, scope) {
const impureComputedPropertyDeclarators = [];
for (const propPath of properties) {
const key = propPath.get("key");
if (propPath.node.computed && !key.isPure()) {
const name = scope.generateUidBasedOnNode(key.node);
const declarator = core.types.variableDeclarator(core.types.identifier(name), key.node);
impureComputedPropertyDeclarators.push(declarator);
key.replaceWith(core.types.identifier(name));
}
}
return impureComputedPropertyDeclarators;
}
function removeUnusedExcludedKeys(path) {
const bindings = path.getOuterBindingIdentifierPaths();
Object.keys(bindings).forEach(bindingName => {
const bindingParentPath = bindings[bindingName].parentPath;
if (path.scope.getBinding(bindingName).references > ZERO_REFS || !bindingParentPath.isObjectProperty()) {
return;
}
bindingParentPath.remove();
});
}
function createObjectRest(path, file, objRef) {
const props = path.get("properties");
const last = props[props.length - 1];
core.types.assertRestElement(last.node);
const restElement = core.types.cloneNode(last.node);
last.remove();
const impureComputedPropertyDeclarators = replaceImpureComputedKeys(path.get("properties"), path.scope);
const {
keys,
allPrimitives,
hasTemplateLiteral
} = extractNormalizedKeys(path.node);
if (keys.length === 0) {
return [impureComputedPropertyDeclarators, restElement.argument, core.types.callExpression(getExtendsHelper(file), [core.types.objectExpression([]), core.types.sequenceExpression([core.types.callExpression(file.addHelper("objectDestructuringEmpty"), [core.types.cloneNode(objRef)]), core.types.cloneNode(objRef)])])];
}
let keyExpression;
if (!allPrimitives) {
keyExpression = core.types.callExpression(core.types.memberExpression(core.types.arrayExpression(keys), core.types.identifier("map")), [file.addHelper("toPropertyKey")]);
} else {
keyExpression = core.types.arrayExpression(keys);
if (!hasTemplateLiteral && !core.types.isProgram(path.scope.block)) {
const program = path.findParent(path => path.isProgram());
const id = path.scope.generateUidIdentifier("excluded");
program.scope.push({
id,
init: keyExpression,
kind: "const"
});
keyExpression = core.types.cloneNode(id);
}
}
return [impureComputedPropertyDeclarators, restElement.argument, core.types.callExpression(file.addHelper(`objectWithoutProperties${objectRestNoSymbols ? "Loose" : ""}`), [core.types.cloneNode(objRef), keyExpression])];
}
function replaceRestElement(parentPath, paramPath, container) {
if (paramPath.isAssignmentPattern()) {
replaceRestElement(parentPath, paramPath.get("left"), container);
return;
}
if (paramPath.isArrayPattern() && hasObjectRestElement(paramPath)) {
const elements = paramPath.get("elements");
for (let i = 0; i < elements.length; i++) {
replaceRestElement(parentPath, elements[i], container);
}
}
if (paramPath.isObjectPattern() && hasObjectRestElement(paramPath)) {
const uid = parentPath.scope.generateUidIdentifier("ref");
const declar = core.types.variableDeclaration("let", [core.types.variableDeclarator(paramPath.node, uid)]);
if (container) {
container.push(declar);
} else {
parentPath.ensureBlock();
parentPath.get("body").unshiftContainer("body", declar);
}
paramPath.replaceWith(core.types.cloneNode(uid));
}
}
return {
name: "transform-object-rest-spread",
manipulateOptions: (_, parser) => parser.plugins.push("objectRestSpread"),
visitor: {
Function(path) {
const params = path.get("params");
const paramsWithRestElement = new Set();
const idsInRestParams = new Set();
for (let i = 0; i < params.length; ++i) {
const param = params[i];
if (hasObjectRestElement(param)) {
paramsWithRestElement.add(i);
for (const name of Object.keys(param.getBindingIdentifiers())) {
idsInRestParams.add(name);
}
}
}
let idInRest = false;
const IdentifierHandler = function (path, functionScope) {
const name = path.node.name;
if (path.scope.getBinding(name) === functionScope.getBinding(name) && idsInRestParams.has(name)) {
idInRest = true;
path.stop();
}
};
let i;
for (i = 0; i < params.length && !idInRest; ++i) {
const param = params[i];
if (!paramsWithRestElement.has(i)) {
if (param.isReferencedIdentifier() || param.isBindingIdentifier()) {
IdentifierHandler(param, path.scope);
} else {
param.traverse({
"Scope|TypeAnnotation|TSTypeAnnotation": path => path.skip(),
"ReferencedIdentifier|BindingIdentifier": IdentifierHandler
}, path.scope);
}
}
}
if (!idInRest) {
for (let i = 0; i < params.length; ++i) {
const param = params[i];
if (paramsWithRestElement.has(i)) {
replaceRestElement(path, param);
}
}
} else {
const shouldTransformParam = idx => idx >= i - 1 || paramsWithRestElement.has(idx);
pluginTransformParameters.convertFunctionParams(path, ignoreFunctionLength, shouldTransformParam, replaceRestElement);
}
},
VariableDeclarator(path, file) {
if (!path.get("id").isObjectPattern()) {
return;
}
let insertionPath = path;
const originalPath = path;
visitObjectRestElements(path.get("id"), path => {
if (shouldStoreRHSInTemporaryVariable(originalPath.node.id) && !core.types.isIdentifier(originalPath.node.init)) {
const initRef = path.scope.generateUidIdentifierBasedOnNode(originalPath.node.init, "ref");
originalPath.insertBefore(core.types.variableDeclarator(initRef, originalPath.node.init));
originalPath.replaceWith(core.types.variableDeclarator(originalPath.node.id, core.types.cloneNode(initRef)));
return;
}
let ref = originalPath.node.init;
const refPropertyPath = [];
let kind;
path.findParent(path => {
if (path.isObjectProperty()) {
refPropertyPath.unshift(path);
} else if (path.isVariableDeclarator()) {
kind = path.parentPath.node.kind;
return true;
}
});
const impureObjRefComputedDeclarators = replaceImpureComputedKeys(refPropertyPath, path.scope);
refPropertyPath.forEach(prop => {
const {
node
} = prop;
ref = core.types.memberExpression(ref, core.types.cloneNode(node.key), node.computed || core.types.isLiteral(node.key));
});
const objectPatternPath = path.parentPath;
const [impureComputedPropertyDeclarators, argument, callExpression] = createObjectRest(objectPatternPath, file, ref);
if (pureGetters) {
removeUnusedExcludedKeys(objectPatternPath);
}
core.types.assertIdentifier(argument);
insertionPath.insertBefore(impureComputedPropertyDeclarators);
insertionPath.insertBefore(impureObjRefComputedDeclarators);
insertionPath = insertionPath.insertAfter(core.types.variableDeclarator(argument, callExpression))[0];
path.scope.registerBinding(kind, insertionPath);
if (objectPatternPath.node.properties.length === 0) {
objectPatternPath.findParent(path => path.isObjectProperty() || path.isVariableDeclarator()).remove();
}
});
},
ExportNamedDeclaration(path) {
const declaration = path.get("declaration");
if (!declaration.isVariableDeclaration()) return;
const hasRest = declaration.get("declarations").some(path => hasObjectRestElement(path.get("id")));
if (!hasRest) return;
const specifiers = [];
for (const name of Object.keys(path.getOuterBindingIdentifiers(true))) {
specifiers.push(core.types.exportSpecifier(core.types.identifier(name), core.types.identifier(name)));
}
path.replaceWith(declaration.node);
path.insertAfter(core.types.exportNamedDeclaration(null, specifiers));
},
CatchClause(path) {
const paramPath = path.get("param");
replaceRestElement(path, paramPath);
},
AssignmentExpression(path, file) {
const leftPath = path.get("left");
if (leftPath.isObjectPattern() && hasObjectRestElement(leftPath)) {
const nodes = [];
const refName = path.scope.generateUidBasedOnNode(path.node.right, "ref");
nodes.push(core.types.variableDeclaration("var", [core.types.variableDeclarator(core.types.identifier(refName), path.node.right)]));
const [impureComputedPropertyDeclarators, argument, callExpression] = createObjectRest(leftPath, file, core.types.identifier(refName));
if (impureComputedPropertyDeclarators.length > 0) {
nodes.push(core.types.variableDeclaration("var", impureComputedPropertyDeclarators));
}
const nodeWithoutSpread = core.types.cloneNode(path.node);
nodeWithoutSpread.right = core.types.identifier(refName);
nodes.push(core.types.expressionStatement(nodeWithoutSpread));
nodes.push(core.types.expressionStatement(core.types.assignmentExpression("=", argument, callExpression)));
nodes.push(core.types.expressionStatement(core.types.identifier(refName)));
path.replaceWithMultiple(nodes);
}
},
ForXStatement(path) {
const {
node,
scope
} = path;
const leftPath = path.get("left");
if (!leftPath.isVariableDeclaration()) {
if (!hasObjectRestElement(leftPath)) {
return;
}
const temp = scope.generateUidIdentifier("ref");
node.left = core.types.variableDeclaration("var", [core.types.variableDeclarator(temp)]);
path.ensureBlock();
const statementBody = path.node.body.body;
const nodes = [];
if (statementBody.length === 0 && path.isCompletionRecord()) {
nodes.unshift(core.types.expressionStatement(scope.buildUndefinedNode()));
}
nodes.unshift(core.types.expressionStatement(core.types.assignmentExpression("=", leftPath.node, core.types.cloneNode(temp))));
pluginTransformDestructuring.unshiftForXStatementBody(path, nodes);
scope.crawl();
return;
} else {
const patternPath = leftPath.get("declarations")[0].get("id");
if (!hasObjectRestElement(patternPath)) {
return;
}
const left = leftPath.node;
const pattern = patternPath.node;
const key = scope.generateUidIdentifier("ref");
node.left = core.types.variableDeclaration(left.kind, [core.types.variableDeclarator(key, null)]);
path.ensureBlock();
pluginTransformDestructuring.unshiftForXStatementBody(path, [core.types.variableDeclaration(node.left.kind, [core.types.variableDeclarator(pattern, core.types.cloneNode(key))])]);
scope.crawl();
return;
}
},
ArrayPattern(path) {
const objectPatterns = [];
const {
scope
} = path;
const uidIdentifiers = [];
visitObjectRestElements(path, path => {
const objectPattern = path.parentPath;
const uid = scope.generateUidIdentifier("ref");
objectPatterns.push({
left: objectPattern.node,
right: uid
});
uidIdentifiers.push(uid);
objectPattern.replaceWith(core.types.cloneNode(uid));
path.skip();
});
if (objectPatterns.length > 0) {
const patternParentPath = path.findParent(path => !(path.isPattern() || path.isObjectProperty()));
const patternParent = patternParentPath.node;
switch (patternParent.type) {
case "VariableDeclarator":
patternParentPath.insertAfter(objectPatterns.map(({
left,
right
}) => core.types.variableDeclarator(left, right)));
break;
case "AssignmentExpression":
{
for (const uidIdentifier of uidIdentifiers) {
scope.push({
id: core.types.cloneNode(uidIdentifier)
});
}
patternParentPath.insertAfter(objectPatterns.map(({
left,
right
}) => core.types.assignmentExpression("=", left, right)));
}
break;
default:
throw new Error(`Unexpected pattern parent type: ${patternParent.type}`);
}
}
},
ObjectExpression(path, file) {
if (!hasSpread(path.node)) return;
let helper;
if (setSpreadProperties) {
helper = getExtendsHelper(file);
} else {
{
try {
helper = file.addHelper("objectSpread2");
} catch (_unused) {
this.file.declarations.objectSpread2 = null;
helper = file.addHelper("objectSpread");
}
}
}
let exp = null;
let props = [];
function make() {
const hadProps = props.length > 0;
const obj = core.types.objectExpression(props);
props = [];
if (!exp) {
exp = core.types.callExpression(helper, [obj]);
return;
}
if (pureGetters) {
if (hadProps) {
exp.arguments.push(obj);
}
return;
}
exp = core.types.callExpression(core.types.cloneNode(helper), [exp, ...(hadProps ? [core.types.objectExpression([]), obj] : [])]);
}
for (const prop of path.node.properties) {
if (core.types.isSpreadElement(prop)) {
make();
exp.arguments.push(prop.argument);
} else {
props.push(prop);
}
}
if (props.length) make();
path.replaceWith(exp);
}
}
};
});
exports.default = index;
//# sourceMappingURL=index.js.map

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{
"name": "@babel/plugin-transform-object-rest-spread",
"version": "7.27.3",
"description": "Compile object rest and spread to ES5",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-transform-object-rest-spread"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-object-rest-spread",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"keywords": [
"babel-plugin"
],
"dependencies": {
"@babel/helper-compilation-targets": "^7.27.2",
"@babel/helper-plugin-utils": "^7.27.1",
"@babel/plugin-transform-destructuring": "^7.27.3",
"@babel/plugin-transform-parameters": "^7.27.1"
},
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "^7.27.3",
"@babel/helper-plugin-test-runner": "^7.27.1",
"@babel/parser": "^7.27.3"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "commonjs"
}