546 lines
20 KiB
JavaScript
546 lines
20 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var helperPluginUtils = require('@babel/helper-plugin-utils');
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var core = require('@babel/core');
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function isPureVoid(node) {
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return core.types.isUnaryExpression(node) && node.operator === "void" && core.types.isPureish(node.argument);
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}
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function unshiftForXStatementBody(statementPath, newStatements) {
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statementPath.ensureBlock();
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const {
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scope,
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node
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} = statementPath;
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const bodyScopeBindings = statementPath.get("body").scope.bindings;
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const hasShadowedBlockScopedBindings = Object.keys(bodyScopeBindings).some(name => scope.hasBinding(name));
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if (hasShadowedBlockScopedBindings) {
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node.body = core.types.blockStatement([...newStatements, node.body]);
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} else {
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node.body.body.unshift(...newStatements);
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}
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}
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function hasArrayRest(pattern) {
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return pattern.elements.some(elem => core.types.isRestElement(elem));
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}
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function hasObjectRest(pattern) {
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return pattern.properties.some(prop => core.types.isRestElement(prop));
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}
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const STOP_TRAVERSAL = {};
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const arrayUnpackVisitor = (node, ancestors, state) => {
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if (!ancestors.length) {
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return;
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}
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if (core.types.isIdentifier(node) && core.types.isReferenced(node, ancestors[ancestors.length - 1].node) && state.bindings[node.name]) {
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state.deopt = true;
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throw STOP_TRAVERSAL;
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}
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};
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class DestructuringTransformer {
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constructor(opts) {
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this.blockHoist = void 0;
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this.operator = void 0;
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this.arrayRefSet = void 0;
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this.nodes = void 0;
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this.scope = void 0;
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this.kind = void 0;
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this.iterableIsArray = void 0;
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this.arrayLikeIsIterable = void 0;
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this.objectRestNoSymbols = void 0;
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this.useBuiltIns = void 0;
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this.addHelper = void 0;
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this.blockHoist = opts.blockHoist;
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this.operator = opts.operator;
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this.arrayRefSet = new Set();
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this.nodes = opts.nodes || [];
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this.scope = opts.scope;
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this.kind = opts.kind;
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this.iterableIsArray = opts.iterableIsArray;
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this.arrayLikeIsIterable = opts.arrayLikeIsIterable;
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this.objectRestNoSymbols = opts.objectRestNoSymbols;
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this.useBuiltIns = opts.useBuiltIns;
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this.addHelper = opts.addHelper;
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}
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getExtendsHelper() {
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return this.useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : this.addHelper("extends");
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}
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buildVariableAssignment(id, init) {
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let op = this.operator;
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if (core.types.isMemberExpression(id) || core.types.isOptionalMemberExpression(id)) op = "=";
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let node;
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if (op) {
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node = core.types.expressionStatement(core.types.assignmentExpression(op, id, core.types.cloneNode(init) || this.scope.buildUndefinedNode()));
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} else {
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let nodeInit;
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if ((this.kind === "const" || this.kind === "using") && init === null) {
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nodeInit = this.scope.buildUndefinedNode();
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} else {
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nodeInit = core.types.cloneNode(init);
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}
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node = core.types.variableDeclaration(this.kind, [core.types.variableDeclarator(id, nodeInit)]);
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}
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node._blockHoist = this.blockHoist;
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return node;
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}
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buildVariableDeclaration(id, init) {
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const declar = core.types.variableDeclaration("var", [core.types.variableDeclarator(core.types.cloneNode(id), core.types.cloneNode(init))]);
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declar._blockHoist = this.blockHoist;
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return declar;
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}
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push(id, _init) {
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const init = core.types.cloneNode(_init);
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if (core.types.isObjectPattern(id)) {
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this.pushObjectPattern(id, init);
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} else if (core.types.isArrayPattern(id)) {
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this.pushArrayPattern(id, init);
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} else if (core.types.isAssignmentPattern(id)) {
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this.pushAssignmentPattern(id, init);
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} else {
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this.nodes.push(this.buildVariableAssignment(id, init));
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}
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}
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toArray(node, count) {
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if (this.iterableIsArray || core.types.isIdentifier(node) && this.arrayRefSet.has(node.name)) {
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return node;
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} else {
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return this.scope.toArray(node, count, this.arrayLikeIsIterable);
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}
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}
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pushAssignmentPattern({
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left,
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right
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}, valueRef) {
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if (isPureVoid(valueRef)) {
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this.push(left, right);
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return;
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}
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const tempId = this.scope.generateUidIdentifierBasedOnNode(valueRef);
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this.nodes.push(this.buildVariableDeclaration(tempId, valueRef));
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const tempConditional = core.types.conditionalExpression(core.types.binaryExpression("===", core.types.cloneNode(tempId), this.scope.buildUndefinedNode()), right, core.types.cloneNode(tempId));
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if (core.types.isPattern(left)) {
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let patternId;
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let node;
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if (this.kind === "const" || this.kind === "let" || this.kind === "using") {
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patternId = this.scope.generateUidIdentifier(tempId.name);
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node = this.buildVariableDeclaration(patternId, tempConditional);
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} else {
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patternId = tempId;
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node = core.types.expressionStatement(core.types.assignmentExpression("=", core.types.cloneNode(tempId), tempConditional));
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}
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this.nodes.push(node);
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this.push(left, patternId);
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} else {
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this.nodes.push(this.buildVariableAssignment(left, tempConditional));
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}
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}
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pushObjectRest(pattern, objRef, spreadProp, spreadPropIndex) {
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const value = buildObjectExcludingKeys(pattern.properties.slice(0, spreadPropIndex), objRef, this.scope, name => this.addHelper(name), this.objectRestNoSymbols, this.useBuiltIns);
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this.nodes.push(this.buildVariableAssignment(spreadProp.argument, value));
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}
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pushObjectProperty(prop, propRef) {
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if (core.types.isLiteral(prop.key)) prop.computed = true;
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const pattern = prop.value;
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const objRef = core.types.memberExpression(core.types.cloneNode(propRef), prop.key, prop.computed);
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if (core.types.isPattern(pattern)) {
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this.push(pattern, objRef);
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} else {
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this.nodes.push(this.buildVariableAssignment(pattern, objRef));
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}
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}
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pushObjectPattern(pattern, objRef) {
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if (!pattern.properties.length) {
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this.nodes.push(core.types.expressionStatement(core.types.callExpression(this.addHelper("objectDestructuringEmpty"), isPureVoid(objRef) ? [] : [objRef])));
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return;
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}
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if (pattern.properties.length > 1 && !this.scope.isStatic(objRef)) {
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const temp = this.scope.generateUidIdentifierBasedOnNode(objRef);
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this.nodes.push(this.buildVariableDeclaration(temp, objRef));
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objRef = temp;
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}
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if (hasObjectRest(pattern)) {
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let copiedPattern;
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for (let i = 0; i < pattern.properties.length; i++) {
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const prop = pattern.properties[i];
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if (core.types.isRestElement(prop)) {
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break;
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}
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const key = prop.key;
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if (prop.computed && !this.scope.isPure(key)) {
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const name = this.scope.generateUidIdentifierBasedOnNode(key);
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this.nodes.push(this.buildVariableDeclaration(name, key));
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if (!copiedPattern) {
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copiedPattern = pattern = Object.assign({}, pattern, {
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properties: pattern.properties.slice()
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});
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}
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copiedPattern.properties[i] = Object.assign({}, prop, {
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key: name
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});
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}
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}
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}
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for (let i = 0; i < pattern.properties.length; i++) {
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const prop = pattern.properties[i];
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if (core.types.isRestElement(prop)) {
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this.pushObjectRest(pattern, objRef, prop, i);
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} else {
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this.pushObjectProperty(prop, objRef);
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}
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}
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}
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canUnpackArrayPattern(pattern, arr) {
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if (!core.types.isArrayExpression(arr)) return false;
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if (pattern.elements.length > arr.elements.length) return;
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if (pattern.elements.length < arr.elements.length && !hasArrayRest(pattern)) {
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return false;
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}
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for (const elem of pattern.elements) {
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if (!elem) return false;
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if (core.types.isMemberExpression(elem)) return false;
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}
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for (const elem of arr.elements) {
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if (core.types.isSpreadElement(elem)) return false;
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if (core.types.isCallExpression(elem)) return false;
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if (core.types.isMemberExpression(elem)) return false;
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}
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const bindings = core.types.getBindingIdentifiers(pattern);
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const state = {
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deopt: false,
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bindings
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};
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try {
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core.types.traverse(arr, arrayUnpackVisitor, state);
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} catch (e) {
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if (e !== STOP_TRAVERSAL) throw e;
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}
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return !state.deopt;
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}
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pushUnpackedArrayPattern(pattern, arr) {
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const holeToUndefined = el => el != null ? el : this.scope.buildUndefinedNode();
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for (let i = 0; i < pattern.elements.length; i++) {
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const elem = pattern.elements[i];
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if (core.types.isRestElement(elem)) {
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this.push(elem.argument, core.types.arrayExpression(arr.elements.slice(i).map(holeToUndefined)));
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} else {
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this.push(elem, holeToUndefined(arr.elements[i]));
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}
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}
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}
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pushArrayPattern(pattern, arrayRef) {
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if (arrayRef === null) {
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this.nodes.push(core.types.expressionStatement(core.types.callExpression(this.addHelper("objectDestructuringEmpty"), [])));
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return;
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}
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if (!pattern.elements) return;
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if (this.canUnpackArrayPattern(pattern, arrayRef)) {
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this.pushUnpackedArrayPattern(pattern, arrayRef);
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return;
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}
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const count = !hasArrayRest(pattern) && pattern.elements.length;
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const toArray = this.toArray(arrayRef, count);
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if (core.types.isIdentifier(toArray)) {
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arrayRef = toArray;
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} else {
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arrayRef = this.scope.generateUidIdentifierBasedOnNode(arrayRef);
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this.arrayRefSet.add(arrayRef.name);
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this.nodes.push(this.buildVariableDeclaration(arrayRef, toArray));
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}
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for (let i = 0; i < pattern.elements.length; i++) {
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const elem = pattern.elements[i];
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if (!elem) continue;
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let elemRef;
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if (core.types.isRestElement(elem)) {
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elemRef = this.toArray(arrayRef);
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elemRef = core.types.callExpression(core.types.memberExpression(elemRef, core.types.identifier("slice")), [core.types.numericLiteral(i)]);
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this.push(elem.argument, elemRef);
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} else {
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elemRef = core.types.memberExpression(arrayRef, core.types.numericLiteral(i), true);
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this.push(elem, elemRef);
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}
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}
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}
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init(pattern, ref) {
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if (!core.types.isArrayExpression(ref) && !core.types.isMemberExpression(ref)) {
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const memo = this.scope.maybeGenerateMemoised(ref, true);
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if (memo) {
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this.nodes.push(this.buildVariableDeclaration(memo, core.types.cloneNode(ref)));
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ref = memo;
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}
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}
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this.push(pattern, ref);
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return this.nodes;
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}
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}
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function buildObjectExcludingKeys(excludedKeys, objRef, scope, addHelper, objectRestNoSymbols, useBuiltIns) {
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const keys = [];
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let allLiteral = true;
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let hasTemplateLiteral = false;
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for (let i = 0; i < excludedKeys.length; i++) {
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const prop = excludedKeys[i];
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const key = prop.key;
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if (core.types.isIdentifier(key) && !prop.computed) {
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keys.push(core.types.stringLiteral(key.name));
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} else if (core.types.isTemplateLiteral(key)) {
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keys.push(core.types.cloneNode(key));
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hasTemplateLiteral = true;
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} else if (core.types.isLiteral(key)) {
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keys.push(core.types.stringLiteral(String(key.value)));
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} else if (core.types.isPrivateName(key)) ; else {
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keys.push(core.types.cloneNode(key));
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allLiteral = false;
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}
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}
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let value;
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if (keys.length === 0) {
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const extendsHelper = useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : addHelper("extends");
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value = core.types.callExpression(extendsHelper, [core.types.objectExpression([]), core.types.sequenceExpression([core.types.callExpression(addHelper("objectDestructuringEmpty"), [core.types.cloneNode(objRef)]), core.types.cloneNode(objRef)])]);
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} else {
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let keyExpression = core.types.arrayExpression(keys);
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if (!allLiteral) {
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keyExpression = core.types.callExpression(core.types.memberExpression(keyExpression, core.types.identifier("map")), [addHelper("toPropertyKey")]);
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} else if (!hasTemplateLiteral && !core.types.isProgram(scope.block)) {
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const programScope = scope.getProgramParent();
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const id = programScope.generateUidIdentifier("excluded");
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programScope.push({
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id,
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init: keyExpression,
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kind: "const"
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});
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keyExpression = core.types.cloneNode(id);
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}
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value = core.types.callExpression(addHelper(`objectWithoutProperties${objectRestNoSymbols ? "Loose" : ""}`), [core.types.cloneNode(objRef), keyExpression]);
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}
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return value;
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}
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function convertVariableDeclaration(path, addHelper, arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns) {
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const {
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node,
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scope
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} = path;
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const nodeKind = node.kind;
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const nodeLoc = node.loc;
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const nodes = [];
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for (let i = 0; i < node.declarations.length; i++) {
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const declar = node.declarations[i];
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const patternId = declar.init;
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const pattern = declar.id;
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const destructuring = new DestructuringTransformer({
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blockHoist: node._blockHoist,
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nodes: nodes,
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scope: scope,
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kind: node.kind,
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iterableIsArray,
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arrayLikeIsIterable,
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useBuiltIns,
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objectRestNoSymbols,
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addHelper
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});
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if (core.types.isPattern(pattern)) {
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destructuring.init(pattern, patternId);
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if (+i !== node.declarations.length - 1) {
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core.types.inherits(nodes[nodes.length - 1], declar);
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}
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} else {
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nodes.push(core.types.inherits(destructuring.buildVariableAssignment(pattern, patternId), declar));
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}
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}
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let tail = null;
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let nodesOut = [];
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for (const node of nodes) {
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if (core.types.isVariableDeclaration(node)) {
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if (tail !== null) {
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tail.declarations.push(...node.declarations);
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continue;
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} else {
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node.kind = nodeKind;
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tail = node;
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}
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} else {
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tail = null;
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}
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if (!node.loc) {
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node.loc = nodeLoc;
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}
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nodesOut.push(node);
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}
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if (nodesOut.length === 2 && core.types.isVariableDeclaration(nodesOut[0]) && core.types.isExpressionStatement(nodesOut[1]) && core.types.isCallExpression(nodesOut[1].expression) && nodesOut[0].declarations.length === 1) {
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const expr = nodesOut[1].expression;
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expr.arguments = [nodesOut[0].declarations[0].init];
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nodesOut = [expr];
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} else {
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if (core.types.isForStatement(path.parent, {
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init: node
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}) && !nodesOut.some(v => core.types.isVariableDeclaration(v))) {
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for (let i = 0; i < nodesOut.length; i++) {
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const node = nodesOut[i];
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if (core.types.isExpressionStatement(node)) {
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nodesOut[i] = node.expression;
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}
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}
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}
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}
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if (nodesOut.length === 1) {
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path.replaceWith(nodesOut[0]);
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} else {
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path.replaceWithMultiple(nodesOut);
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}
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scope.crawl();
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}
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function convertAssignmentExpression(path, addHelper, arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns) {
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const {
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node,
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scope,
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parentPath
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} = path;
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const nodes = [];
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const destructuring = new DestructuringTransformer({
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operator: node.operator,
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scope: scope,
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nodes: nodes,
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arrayLikeIsIterable,
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iterableIsArray,
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objectRestNoSymbols,
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useBuiltIns,
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addHelper
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});
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let ref;
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if (!parentPath.isExpressionStatement() && !parentPath.isSequenceExpression() || path.isCompletionRecord()) {
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ref = scope.generateUidIdentifierBasedOnNode(node.right, "ref");
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nodes.push(core.types.variableDeclaration("var", [core.types.variableDeclarator(ref, node.right)]));
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if (core.types.isArrayExpression(node.right)) {
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destructuring.arrayRefSet.add(ref.name);
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}
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}
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destructuring.init(node.left, ref || node.right);
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if (ref) {
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if (parentPath.isArrowFunctionExpression()) {
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path.replaceWith(core.types.blockStatement([]));
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nodes.push(core.types.returnStatement(core.types.cloneNode(ref)));
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} else {
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nodes.push(core.types.expressionStatement(core.types.cloneNode(ref)));
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}
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}
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path.replaceWithMultiple(nodes);
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scope.crawl();
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}
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function variableDeclarationHasPattern(node) {
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for (const declar of node.declarations) {
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if (core.types.isPattern(declar.id)) {
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return true;
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}
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}
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return false;
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}
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var index = helperPluginUtils.declare((api, options) => {
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var _ref, _api$assumption, _ref2, _options$allowArrayLi, _ref3, _api$assumption2;
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api.assertVersion(7);
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const {
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useBuiltIns = false
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} = options;
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const iterableIsArray = (_ref = (_api$assumption = api.assumption("iterableIsArray")) != null ? _api$assumption : options.loose) != null ? _ref : false;
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const arrayLikeIsIterable = (_ref2 = (_options$allowArrayLi = options.allowArrayLike) != null ? _options$allowArrayLi : api.assumption("arrayLikeIsIterable")) != null ? _ref2 : false;
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const objectRestNoSymbols = (_ref3 = (_api$assumption2 = api.assumption("objectRestNoSymbols")) != null ? _api$assumption2 : options.loose) != null ? _ref3 : false;
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return {
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name: "transform-destructuring",
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visitor: {
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ExportNamedDeclaration(path) {
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const declaration = path.get("declaration");
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if (!declaration.isVariableDeclaration()) return;
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if (!variableDeclarationHasPattern(declaration.node)) return;
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const specifiers = [];
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for (const name of Object.keys(path.getOuterBindingIdentifiers())) {
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specifiers.push(core.types.exportSpecifier(core.types.identifier(name), core.types.identifier(name)));
|
|
}
|
|
path.replaceWith(declaration.node);
|
|
path.insertAfter(core.types.exportNamedDeclaration(null, specifiers));
|
|
path.scope.crawl();
|
|
},
|
|
ForXStatement(path) {
|
|
const {
|
|
node,
|
|
scope
|
|
} = path;
|
|
const left = node.left;
|
|
if (core.types.isPattern(left)) {
|
|
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("=", left, core.types.cloneNode(temp))));
|
|
unshiftForXStatementBody(path, nodes);
|
|
scope.crawl();
|
|
return;
|
|
}
|
|
if (!core.types.isVariableDeclaration(left)) return;
|
|
const pattern = left.declarations[0].id;
|
|
if (!core.types.isPattern(pattern)) return;
|
|
const key = scope.generateUidIdentifier("ref");
|
|
node.left = core.types.variableDeclaration(left.kind, [core.types.variableDeclarator(key, null)]);
|
|
const nodes = [];
|
|
const destructuring = new DestructuringTransformer({
|
|
kind: left.kind,
|
|
scope: scope,
|
|
nodes: nodes,
|
|
arrayLikeIsIterable,
|
|
iterableIsArray,
|
|
objectRestNoSymbols,
|
|
useBuiltIns,
|
|
addHelper: name => this.addHelper(name)
|
|
});
|
|
destructuring.init(pattern, key);
|
|
unshiftForXStatementBody(path, nodes);
|
|
scope.crawl();
|
|
},
|
|
CatchClause({
|
|
node,
|
|
scope
|
|
}) {
|
|
const pattern = node.param;
|
|
if (!core.types.isPattern(pattern)) return;
|
|
const ref = scope.generateUidIdentifier("ref");
|
|
node.param = ref;
|
|
const nodes = [];
|
|
const destructuring = new DestructuringTransformer({
|
|
kind: "let",
|
|
scope: scope,
|
|
nodes: nodes,
|
|
arrayLikeIsIterable,
|
|
iterableIsArray,
|
|
objectRestNoSymbols,
|
|
useBuiltIns,
|
|
addHelper: name => this.addHelper(name)
|
|
});
|
|
destructuring.init(pattern, ref);
|
|
node.body.body = [...nodes, ...node.body.body];
|
|
scope.crawl();
|
|
},
|
|
AssignmentExpression(path, state) {
|
|
if (!core.types.isPattern(path.node.left)) return;
|
|
convertAssignmentExpression(path, name => state.addHelper(name), arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns);
|
|
},
|
|
VariableDeclaration(path, state) {
|
|
const {
|
|
node,
|
|
parent
|
|
} = path;
|
|
if (core.types.isForXStatement(parent)) return;
|
|
if (!parent || !path.container) return;
|
|
if (!variableDeclarationHasPattern(node)) return;
|
|
convertVariableDeclaration(path, name => state.addHelper(name), arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns);
|
|
}
|
|
}
|
|
};
|
|
});
|
|
|
|
exports.buildObjectExcludingKeys = buildObjectExcludingKeys;
|
|
exports.default = index;
|
|
exports.unshiftForXStatementBody = unshiftForXStatementBody;
|
|
//# sourceMappingURL=index.js.map
|