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MIT License
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Copyright (c) 2014-present Sebastian McKenzie and other contributors
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# @babel/plugin-proposal-object-rest-spread
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> Compile object rest and spread to ES5
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See our website [@babel/plugin-proposal-object-rest-spread](https://babeljs.io/docs/en/babel-plugin-proposal-object-rest-spread) for more information.
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## Install
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Using npm:
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```sh
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npm install --save-dev @babel/plugin-proposal-object-rest-spread
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```
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or using yarn:
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```sh
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yarn add @babel/plugin-proposal-object-rest-spread --dev
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```
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{"version":3,"file":"index.js","sources":["../../babel-compat-data/corejs2-built-ins.js","../src/shouldStoreRHSInTemporaryVariable.ts","../src/index.ts"],"sourcesContent":["module.exports = require(\"./data/corejs2-built-ins.json\");\n","import { types as t } from \"@babel/core\";\n\nconst {\n isObjectProperty,\n isArrayPattern,\n isObjectPattern,\n isAssignmentPattern,\n isRestElement,\n isIdentifier,\n} = t;\n/**\n * This is a helper function to determine if we should create an intermediate variable\n * such that the RHS of an assignment is not duplicated.\n *\n * See https://github.com/babel/babel/pull/13711#issuecomment-914388382 for discussion\n * on further optimizations.\n */\nexport default function shouldStoreRHSInTemporaryVariable(node: t.LVal) {\n if (isArrayPattern(node)) {\n const nonNullElements = node.elements.filter(element => element !== null);\n if (nonNullElements.length > 1) return true;\n else return shouldStoreRHSInTemporaryVariable(nonNullElements[0]);\n } else if (isObjectPattern(node)) {\n const { properties } = node;\n if (properties.length > 1) return true;\n else if (properties.length === 0) return false;\n else {\n const firstProperty = properties[0];\n if (isObjectProperty(firstProperty)) {\n // the value of the property must be an LVal\n return shouldStoreRHSInTemporaryVariable(firstProperty.value as t.LVal);\n } else {\n return shouldStoreRHSInTemporaryVariable(firstProperty);\n }\n }\n } else if (isAssignmentPattern(node)) {\n return shouldStoreRHSInTemporaryVariable(node.left);\n } else if (isRestElement(node)) {\n if (isIdentifier(node.argument)) return true;\n return shouldStoreRHSInTemporaryVariable(node.argument);\n } else {\n // node is Identifier or MemberExpression\n return false;\n }\n}\n","import { declare } from \"@babel/helper-plugin-utils\";\nimport syntaxObjectRestSpread from \"@babel/plugin-syntax-object-rest-spread\";\nimport { types as t } from \"@babel/core\";\nimport type { PluginPass } from \"@babel/core\";\nimport type { NodePath, Visitor, Scope } from \"@babel/traverse\";\nimport { convertFunctionParams } from \"@babel/plugin-transform-parameters\";\nimport { isRequired } from \"@babel/helper-compilation-targets\";\nimport compatData from \"@babel/compat-data/corejs2-built-ins\";\nimport shouldStoreRHSInTemporaryVariable from \"./shouldStoreRHSInTemporaryVariable\";\n\nconst { isAssignmentPattern, isObjectProperty } = t;\n// @babel/types <=7.3.3 counts FOO as referenced in var { x: FOO }.\n// We need to detect this bug to know if \"unused\" means 0 or 1 references.\nif (!process.env.BABEL_8_BREAKING) {\n const node = t.identifier(\"a\");\n const property = t.objectProperty(t.identifier(\"key\"), node);\n const pattern = t.objectPattern([property]);\n\n // eslint-disable-next-line no-var\n var ZERO_REFS = t.isReferenced(node, property, pattern) ? 1 : 0;\n}\n\nexport default declare((api, opts) => {\n api.assertVersion(7);\n\n const targets = api.targets();\n const supportsObjectAssign = !isRequired(\"es6.object.assign\", targets, {\n compatData,\n });\n\n const { useBuiltIns = supportsObjectAssign, loose = false } = opts;\n\n if (typeof loose !== \"boolean\") {\n throw new Error(\".loose must be a boolean, or undefined\");\n }\n\n const ignoreFunctionLength = api.assumption(\"ignoreFunctionLength\") ?? loose;\n const objectRestNoSymbols = api.assumption(\"objectRestNoSymbols\") ?? loose;\n const pureGetters = api.assumption(\"pureGetters\") ?? loose;\n const setSpreadProperties = api.assumption(\"setSpreadProperties\") ?? loose;\n\n function getExtendsHelper(\n file: PluginPass,\n ): t.MemberExpression | t.Identifier {\n return useBuiltIns\n ? t.memberExpression(t.identifier(\"Object\"), t.identifier(\"assign\"))\n : file.addHelper(\"extends\");\n }\n\n function hasRestElement(path) {\n let foundRestElement = false;\n visitRestElements(path, restElement => {\n foundRestElement = true;\n restElement.stop();\n });\n return foundRestElement;\n }\n\n function hasObjectPatternRestElement(path: NodePath): boolean {\n let foundRestElement = false;\n visitRestElements(path, restElement => {\n if (restElement.parentPath.isObjectPattern()) {\n foundRestElement = true;\n restElement.stop();\n }\n });\n return foundRestElement;\n }\n\n function visitRestElements(\n path: NodePath,\n visitor: (path: NodePath<t.RestElement>) => any,\n ) {\n path.traverse({\n Expression(path) {\n const { parent, key } = path;\n if (\n (isAssignmentPattern(parent) && key === \"right\") ||\n (isObjectProperty(parent) && parent.computed && key === \"key\")\n ) {\n path.skip();\n }\n },\n RestElement: visitor,\n });\n }\n\n function hasSpread(node: t.ObjectExpression): boolean {\n for (const prop of node.propeLine truncated
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{
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"name": "@babel/plugin-proposal-object-rest-spread",
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"version": "7.17.3",
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"description": "Compile object rest and spread to ES5",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/babel.git",
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"directory": "packages/babel-plugin-proposal-object-rest-spread"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-object-rest-spread",
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"license": "MIT",
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"publishConfig": {
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"access": "public"
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},
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"main": "./lib/index.js",
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"keywords": [
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"babel-plugin"
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],
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"dependencies": {
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"@babel/compat-data": "^7.17.0",
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"@babel/helper-compilation-targets": "^7.16.7",
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"@babel/helper-plugin-utils": "^7.16.7",
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"@babel/plugin-syntax-object-rest-spread": "^7.8.3",
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"@babel/plugin-transform-parameters": "^7.16.7"
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},
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"peerDependencies": {
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"@babel/core": "^7.0.0-0"
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},
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"devDependencies": {
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"@babel/core": "^7.17.3",
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"@babel/helper-plugin-test-runner": "^7.16.7",
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"@babel/parser": "^7.17.3"
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},
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"engines": {
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"node": ">=6.9.0"
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},
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"author": "The Babel Team (https://babel.dev/team)"
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}
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