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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-transform-computed-properties
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> Compile ES2015 computed properties to ES5
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See our website [@babel/plugin-transform-computed-properties](https://babeljs.io/docs/babel-plugin-transform-computed-properties) 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-transform-computed-properties
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```
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or using yarn:
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```sh
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yarn add @babel/plugin-transform-computed-properties --dev
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```
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _core = require("@babel/core");
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var _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _template = require("@babel/template");
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var DefineAccessorHelper = _template.default.expression.ast`
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function (type, obj, key, fn) {
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var desc = { configurable: true, enumerable: true };
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desc[type] = fn;
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return Object.defineProperty(obj, key, desc);
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}
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`;
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DefineAccessorHelper._compact = true;
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var _default = exports.default = (0, _helperPluginUtils.declare)((api, options) => {
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var _api$assumption;
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api.assertVersion(7);
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const setComputedProperties = (_api$assumption = api.assumption("setComputedProperties")) != null ? _api$assumption : options.loose;
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const pushComputedProps = setComputedProperties ? pushComputedPropsLoose : pushComputedPropsSpec;
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function buildDefineAccessor(state, obj, prop) {
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const type = prop.kind;
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const key = !prop.computed && _core.types.isIdentifier(prop.key) ? _core.types.stringLiteral(prop.key.name) : prop.key;
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const fn = getValue(prop);
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let helper;
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if (state.availableHelper("defineAccessor")) {
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helper = state.addHelper("defineAccessor");
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} else {
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const file = state.file;
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helper = file.get("fallbackDefineAccessorHelper");
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if (!helper) {
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const id = file.scope.generateUidIdentifier("defineAccessor");
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file.scope.push({
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id,
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init: DefineAccessorHelper
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});
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file.set("fallbackDefineAccessorHelper", helper = id);
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}
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helper = _core.types.cloneNode(helper);
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}
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return _core.types.callExpression(helper, [_core.types.stringLiteral(type), obj, key, fn]);
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}
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function getValue(prop) {
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if (_core.types.isObjectProperty(prop)) {
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return prop.value;
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} else if (_core.types.isObjectMethod(prop)) {
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return _core.types.functionExpression(null, prop.params, prop.body, prop.generator, prop.async);
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}
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}
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function pushAssign(objId, prop, body) {
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body.push(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.memberExpression(_core.types.cloneNode(objId), prop.key, prop.computed || _core.types.isLiteral(prop.key)), getValue(prop))));
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}
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function pushComputedPropsLoose(info) {
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const {
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computedProps,
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state,
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initPropExpression,
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objId,
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body
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} = info;
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for (const prop of computedProps) {
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if (_core.types.isObjectMethod(prop) && (prop.kind === "get" || prop.kind === "set")) {
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if (computedProps.length === 1) {
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return buildDefineAccessor(state, initPropExpression, prop);
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} else {
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body.push(_core.types.expressionStatement(buildDefineAccessor(state, _core.types.cloneNode(objId), prop)));
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}
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} else {
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pushAssign(_core.types.cloneNode(objId), prop, body);
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}
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}
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}
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function pushComputedPropsSpec(info) {
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const {
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objId,
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body,
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computedProps,
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state
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} = info;
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const CHUNK_LENGTH_CAP = 10;
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let currentChunk = null;
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const computedPropsChunks = [];
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for (const prop of computedProps) {
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if (!currentChunk || currentChunk.length === CHUNK_LENGTH_CAP) {
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currentChunk = [];
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computedPropsChunks.push(currentChunk);
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}
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currentChunk.push(prop);
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}
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for (const chunk of computedPropsChunks) {
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const single = computedPropsChunks.length === 1;
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let node = single ? info.initPropExpression : _core.types.cloneNode(objId);
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for (const prop of chunk) {
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if (_core.types.isObjectMethod(prop) && (prop.kind === "get" || prop.kind === "set")) {
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node = buildDefineAccessor(info.state, node, prop);
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} else {
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node = _core.types.callExpression(state.addHelper("defineProperty"), [node, _core.types.toComputedKey(prop), getValue(prop)]);
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}
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}
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if (single) return node;
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body.push(_core.types.expressionStatement(node));
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}
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}
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return {
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name: "transform-computed-properties",
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visitor: {
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ObjectExpression: {
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exit(path, state) {
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const {
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node,
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parent,
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scope
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} = path;
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let hasComputed = false;
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for (const prop of node.properties) {
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hasComputed = prop.computed === true;
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if (hasComputed) break;
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}
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if (!hasComputed) return;
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const initProps = [];
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const computedProps = [];
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let foundComputed = false;
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for (const prop of node.properties) {
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if (_core.types.isSpreadElement(prop)) {
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continue;
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}
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if (prop.computed) {
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foundComputed = true;
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}
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if (foundComputed) {
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computedProps.push(prop);
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} else {
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initProps.push(prop);
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}
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}
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const objId = scope.generateUidIdentifierBasedOnNode(parent);
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const initPropExpression = _core.types.objectExpression(initProps);
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const body = [];
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body.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(objId, initPropExpression)]));
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const single = pushComputedProps({
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scope,
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objId,
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body,
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computedProps,
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initPropExpression,
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state
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});
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if (single) {
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path.replaceWith(single);
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} else {
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if (setComputedProperties) {
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body.push(_core.types.expressionStatement(_core.types.cloneNode(objId)));
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}
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path.replaceWithMultiple(body);
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}
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}
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}
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}
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};
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});
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//# sourceMappingURL=index.js.map
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{"version":3,"names":["_core","require","_helperPluginUtils","_template","DefineAccessorHelper","template","expression","ast","_compact","_default","exports","default","declare","api","options","_api$assumption","assertVersion","setComputedProperties","assumption","loose","pushComputedProps","pushComputedPropsLoose","pushComputedPropsSpec","buildDefineAccessor","state","obj","prop","type","kind","key","computed","t","isIdentifier","stringLiteral","name","fn","getValue","helper","availableHelper","addHelper","file","get","id","scope","generateUidIdentifier","push","init","set","cloneNode","callExpression","isObjectProperty","value","isObjectMethod","functionExpression","params","body","generator","async","pushAssign","objId","expressionStatement","assignmentExpression","memberExpression","isLiteral","info","computedProps","initPropExpression","length","CHUNK_LENGTH_CAP","currentChunk","computedPropsChunks","chunk","single","node","toComputedKey","visitor","ObjectExpression","exit","path","parent","hasComputed","properties","initProps","foundComputed","isSpreadElement","generateUidIdentifierBasedOnNode","objectExpression","variableDeclaration","variableDeclarator","replaceWith","replaceWithMultiple"],"sources":["../src/index.ts"],"sourcesContent":["import { types as t } from \"@babel/core\";\nimport type { PluginPass, Scope } from \"@babel/core\";\nimport { declare } from \"@babel/helper-plugin-utils\";\nimport template from \"@babel/template\";\n\nexport interface Options {\n loose?: boolean;\n}\n\ntype PropertyInfo = {\n scope: Scope;\n objId: t.Identifier;\n body: t.Statement[];\n computedProps: t.ObjectMember[];\n initPropExpression: t.ObjectExpression;\n state: PluginPass;\n};\n\nif (!process.env.BABEL_8_BREAKING) {\n // eslint-disable-next-line no-var\n var DefineAccessorHelper = template.expression.ast`\n function (type, obj, key, fn) {\n var desc = { configurable: true, enumerable: true };\n desc[type] = fn;\n return Object.defineProperty(obj, key, desc);\n }\n `;\n // @ts-expect-error undocumented _compact node property\n DefineAccessorHelper._compact = true;\n}\n\nexport default declare((api, options: Options) => {\n api.assertVersion(REQUIRED_VERSION(7));\n\n const setComputedProperties =\n api.assumption(\"setComputedProperties\") ?? options.loose;\n\n const pushComputedProps = setComputedProperties\n ? pushComputedPropsLoose\n : pushComputedPropsSpec;\n\n function buildDefineAccessor(\n state: PluginPass,\n obj: t.Expression,\n prop: t.ObjectMethod,\n ) {\n const type = prop.kind as \"get\" | \"set\";\n const key =\n !prop.computed && t.isIdentifier(prop.key)\n ? t.stringLiteral(prop.key.name)\n : prop.key;\n const fn = getValue(prop);\n if (process.env.BABEL_8_BREAKING) {\n return t.callExpression(state.addHelper(\"defineAccessor\"), [\n t.stringLiteral(type),\n obj,\n key,\n fn,\n ]);\n } else {\n let helper: t.Identifier;\n if (state.availableHelper(\"defineAccessor\")) {\n helper = state.addHelper(\"defineAccessor\");\n } else {\n // Fallback for @babel/helpers <= 7.20.6, manually add helper function\n const file = state.file;\n helper = file.get(\"fallbackDefineAccessorHelper\");\n if (!helper) {\n const id = file.scope.generateUidIdentifier(\"defineAccessor\");\n file.scope.push({\n id,\n init: DefineAccessorHelper,\n });\n file.set(\"fallbackDefineAccessorHelper\", (helper = id));\n }\n helper = t.cloneNode(helper);\n }\n\n return t.callExpression(helper, [t.stringLiteral(type), obj, key, fn]);\n }\n }\n\n /**\n * Get value of an object member under object expression.\n * Returns a function expression if prop is a ObjectMethod.\n *\n * @param {t.ObjectMember} prop\n * @returns t.Expression\n */\n function getValue(prop: t.ObjectMember) {\n if (t.isObjectProperty(prop)) {\n return prop.value as t.Expression;\n } else if (t.isObjectMethod(prop)) {\n return t.functionExpression(\n null,\n prop.params,\n prop.body,\n prop.generator,\n prop.async,\n );\n }\n }\n\n function pushAssign(\n objId: t.Identifier,\n prop: t.ObjectMember,\n body: t.Statement[],\n ) {\n body.push(\n t.expressionStatement(\n t.assignmentExpression(\n \"=\",\n t.memberExpression(\n t.cloneNode(objId),\n prop.key,\n prop.computed || t.isLiteral(prop.key),\n ),\n getValue(prop),\n ),\n ),\n );\n }\n\n function pushComputedPropsLoose(info: PropertyInfo) {\n const { computedProps, state, initPropExpression, objId, body } = info;\n\n for (const prop of computedProps) {\n if (\n t.isObjectMethod(prop) &&\n (prop.kind === \"get\" || prop.kind === \"set\")\n Line truncated
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Generated
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+35
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{
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"name": "@babel/plugin-transform-computed-properties",
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"version": "7.29.7",
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"description": "Compile ES2015 computed properties 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-transform-computed-properties"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-computed-properties",
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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/helper-plugin-utils": "^7.29.7",
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"@babel/template": "^7.29.7"
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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": "^7.29.7",
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"@babel/helper-plugin-test-runner": "^7.29.7"
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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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"type": "commonjs"
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}
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Block a user