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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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Generated
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# @babel/plugin-transform-class-static-block
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> Transform class static blocks
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See our website [@babel/plugin-transform-class-static-block](https://babeljs.io/docs/babel-plugin-transform-class-static-block) 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-class-static-block
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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-class-static-block --dev
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```
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Generated
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+153
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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 _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _helperCreateClassFeaturesPlugin = require("@babel/helper-create-class-features-plugin");
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function generateUid(scope, denyList) {
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const name = "";
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let uid;
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let i = 1;
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do {
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uid = `_${name}`;
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if (i > 1) uid += i;
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i++;
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} while (denyList.has(uid));
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return uid;
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}
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function mapLast(arr, fn) {
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if (arr.length === 0) return arr;
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return [...arr.slice(0, -1), fn(arr[arr.length - 1])];
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}
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var _default = exports.default = (0, _helperPluginUtils.declare)(({
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types: t,
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template,
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traverse,
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assertVersion
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}) => {
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assertVersion("^7.12.0 || ^8.0.0-0 || >8.0.0-alpha <8.0.0-beta");
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const rawNamedEvaluationVisitor = (0, _helperCreateClassFeaturesPlugin.buildNamedEvaluationVisitor)(path => {
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if (!path.isClassExpression()) return false;
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for (let i = path.node.body.body.length - 1; i >= 0; i--) {
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const el = path.node.body.body[i];
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if (t.isStaticBlock(el)) {
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return true;
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}
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if ((t.isClassProperty(el) || t.isClassPrivateProperty(el)) && el.static) {
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break;
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}
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}
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return false;
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}, (classPath, state, name) => {
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const nameNode = typeof name === "string" ? t.stringLiteral(name) : name;
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classPath.get("body").unshiftContainer("body", t.staticBlock([template.statement.ast`
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${state.addHelper("setFunctionName")}(this, ${nameNode});
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`]));
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});
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if (!t.classAccessorProperty) {
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delete rawNamedEvaluationVisitor.ClassAccessorProperty;
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}
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const namedEvaluationVisitor = traverse.visitors.explode(rawNamedEvaluationVisitor);
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const maybeSequenceExpression = expressions => {
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if (expressions.length === 1) {
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return expressions[0];
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} else {
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return t.sequenceExpression(expressions);
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}
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};
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const blocksToExpressions = blocks => blocks.map(block => {
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const {
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body
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} = block;
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if (body.length === 1 && t.isExpressionStatement(body[0])) {
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return t.inheritsComments(t.inheritsComments(body[0].expression, body[0]), block);
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}
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return t.inheritsComments(template.expression.ast`(() => { ${body} })()`, block);
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});
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const prependToInitializer = (prop, expressions) => {
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prop.value = prop.value ? t.sequenceExpression([...expressions, prop.value]) : maybeSequenceExpression(mapLast(expressions, expr => t.unaryExpression("void", expr)));
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};
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return {
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name: "transform-class-static-block",
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manipulateOptions: (_, parser) => parser.plugins.push("classStaticBlock"),
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pre() {
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(0, _helperCreateClassFeaturesPlugin.enableFeature)(this.file, _helperCreateClassFeaturesPlugin.FEATURES.staticBlocks, false);
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},
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visitor: {
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ClassBody(classBody) {
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const {
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scope
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} = classBody;
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let parentPath = classBody.parentPath;
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if (parentPath.isClassExpression() && !parentPath.node.id) {
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do ({
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parentPath
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} = parentPath); while (parentPath && !namedEvaluationVisitor[parentPath.type] && !parentPath.isStatement());
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if (parentPath) {
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var _namedEvaluationVisit;
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(_namedEvaluationVisit = namedEvaluationVisitor[parentPath.type]) == null || _namedEvaluationVisit.enter.forEach(f => f.call(this, parentPath, this));
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}
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}
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const pendingStaticBlocks = [];
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let lastStaticProp = null;
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for (const path of classBody.get("body")) {
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if (path.isStaticBlock()) {
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pendingStaticBlocks.push(path.node);
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path.remove();
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} else if (path.isClassProperty({
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static: true
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}) || path.isClassPrivateProperty({
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static: true
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})) {
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lastStaticProp = path;
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if (pendingStaticBlocks.length > 0) {
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prependToInitializer(path.node, blocksToExpressions(pendingStaticBlocks));
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pendingStaticBlocks.length = 0;
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}
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}
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}
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if (pendingStaticBlocks.length > 0) {
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const tmp = scope.generateDeclaredUidIdentifier("staticBlock");
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let arrowBody;
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const needsCompletionValue = classBody.parentPath.isExpression();
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if (pendingStaticBlocks.length > 1 || pendingStaticBlocks[0].body.length === 1 && t.isExpressionStatement(pendingStaticBlocks[0].body[0])) {
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const expressions = blocksToExpressions(pendingStaticBlocks);
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if (needsCompletionValue) {
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expressions.push(t.thisExpression());
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}
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arrowBody = maybeSequenceExpression(expressions);
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} else {
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arrowBody = t.blockStatement(pendingStaticBlocks[0].body);
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if (needsCompletionValue) {
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arrowBody.body.push(t.returnStatement(t.thisExpression()));
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}
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}
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const init = template.expression.ast`${tmp} = () => ${arrowBody}`;
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if (lastStaticProp) {
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prependToInitializer(lastStaticProp.node, [init]);
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} else {
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const privateNames = new Set();
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for (const path of classBody.get("body")) {
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if (path.isPrivate()) {
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privateNames.add(path.get("key.id").node.name);
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}
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}
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const staticBlockPrivateId = generateUid(scope, privateNames);
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const staticBlockRef = t.privateName(t.identifier(staticBlockPrivateId));
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classBody.pushContainer("body", [t.classPrivateProperty(staticBlockRef, init, [], true)]);
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}
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const staticBlockClosureCall = t.callExpression(t.cloneNode(tmp), []);
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if (classBody.parentPath.isClassExpression()) {
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classBody.parentPath.replaceWith(t.sequenceExpression([classBody.parent, staticBlockClosureCall]));
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} else {
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classBody.parentPath.insertAfter(t.expressionStatement(staticBlockClosureCall));
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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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Generated
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+1
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{"version":3,"names":["_helperPluginUtils","require","_helperCreateClassFeaturesPlugin","generateUid","scope","denyList","name","uid","i","has","mapLast","arr","fn","length","slice","_default","exports","default","declare","types","t","template","traverse","assertVersion","rawNamedEvaluationVisitor","buildNamedEvaluationVisitor","path","isClassExpression","node","body","el","isStaticBlock","isClassProperty","isClassPrivateProperty","static","classPath","state","nameNode","stringLiteral","get","unshiftContainer","staticBlock","statement","ast","addHelper","classAccessorProperty","ClassAccessorProperty","namedEvaluationVisitor","visitors","explode","maybeSequenceExpression","expressions","sequenceExpression","blocksToExpressions","blocks","map","block","isExpressionStatement","inheritsComments","expression","prependToInitializer","prop","value","expr","unaryExpression","manipulateOptions","_","parser","plugins","push","pre","enableFeature","file","FEATURES","staticBlocks","visitor","ClassBody","classBody","parentPath","id","type","isStatement","_namedEvaluationVisit","enter","forEach","f","call","pendingStaticBlocks","lastStaticProp","remove","tmp","generateDeclaredUidIdentifier","arrowBody","needsCompletionValue","isExpression","thisExpression","blockStatement","returnStatement","init","privateNames","Set","isPrivate","add","staticBlockPrivateId","staticBlockRef","privateName","identifier","pushContainer","classPrivateProperty","staticBlockClosureCall","callExpression","cloneNode","replaceWith","parent","insertAfter","expressionStatement"],"sources":["../src/index.ts"],"sourcesContent":["import { declare } from \"@babel/helper-plugin-utils\";\nimport type { NodePath, Scope, types as t } from \"@babel/core\";\n\nimport {\n buildNamedEvaluationVisitor,\n enableFeature,\n FEATURES,\n} from \"@babel/helper-create-class-features-plugin\";\n\n/**\n * Generate a uid that is not in `denyList`\n *\n * @param {Scope} scope\n * @param {Set<string>} denyList a deny list that the generated uid should avoid\n * @returns\n */\nfunction generateUid(scope: Scope, denyList: Set<string>) {\n const name = \"\";\n let uid;\n let i = 1;\n do {\n uid = `_${name}`;\n if (i > 1) uid += i;\n i++;\n } while (denyList.has(uid));\n return uid;\n}\n\nfunction mapLast<T>(arr: T[], fn: (value: T) => T): T[] {\n if (arr.length === 0) return arr;\n return [...arr.slice(0, -1), fn(arr[arr.length - 1])];\n}\n\nexport default declare(({ types: t, template, traverse, assertVersion }) => {\n assertVersion(REQUIRED_VERSION(\"^7.12.0 || ^8.0.0-0\"));\n\n const rawNamedEvaluationVisitor = buildNamedEvaluationVisitor(\n (path: NodePath) => {\n if (!path.isClassExpression()) return false;\n for (let i = path.node.body.body.length - 1; i >= 0; i--) {\n const el = path.node.body.body[i];\n if (t.isStaticBlock(el)) {\n return true;\n }\n if (\n (t.isClassProperty(el) || t.isClassPrivateProperty(el)) &&\n el.static\n ) {\n break;\n }\n }\n return false;\n },\n (classPath: NodePath<t.ClassExpression>, state, name) => {\n const nameNode = typeof name === \"string\" ? t.stringLiteral(name) : name;\n\n classPath.get(\"body\").unshiftContainer(\n \"body\",\n t.staticBlock([\n template.statement.ast`\n ${state.addHelper(\"setFunctionName\")}(this, ${nameNode});\n `,\n ]),\n );\n },\n );\n\n if (!process.env.BABEL_8_BREAKING && !t.classAccessorProperty) {\n // For old versions of Babel 7, with no ClassAccessorProperty support.\n delete rawNamedEvaluationVisitor.ClassAccessorProperty;\n }\n\n const namedEvaluationVisitor = traverse.visitors.explode(\n rawNamedEvaluationVisitor,\n );\n\n const maybeSequenceExpression = (\n expressions: t.Expression[],\n ): t.Expression => {\n if (expressions.length === 1) {\n return expressions[0];\n } else {\n return t.sequenceExpression(expressions);\n }\n };\n\n const blocksToExpressions = (blocks: t.StaticBlock[]) =>\n blocks.map(block => {\n const { body } = block;\n if (body.length === 1 && t.isExpressionStatement(body[0])) {\n // We special-case the single expression case to avoid the iife, since\n // it's common.\n return t.inheritsComments(\n t.inheritsComments(body[0].expression, body[0]),\n block,\n );\n }\n return t.inheritsComments(\n template.expression.ast`(() => { ${body} })()`,\n block,\n );\n });\n\n const prependToInitializer = (\n prop: t.ClassProperty | t.ClassPrivateProperty,\n expressions: t.Expression[],\n ) => {\n prop.value = prop.value\n ? t.sequenceExpression([...expressions, prop.value])\n : maybeSequenceExpression(\n mapLast(expressions, expr => t.unaryExpression(\"void\", expr)),\n );\n };\n\n return {\n name: \"transform-class-static-bLine truncated
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Generated
Vendored
+46
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{
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"name": "@babel/plugin-transform-class-static-block",
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"version": "7.29.7",
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"description": "Transform class static blocks",
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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-class-static-block"
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},
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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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"exports": {
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".": {
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"types": "./lib/index.d.ts",
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"default": "./lib/index.js"
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},
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"./package.json": "./package.json"
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},
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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-create-class-features-plugin": "^7.29.7",
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"@babel/helper-plugin-utils": "^7.29.7"
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},
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"peerDependencies": {
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"@babel/core": "^7.12.0"
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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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"@babel/plugin-external-helpers": "^7.29.7",
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"@babel/plugin-transform-class-properties": "^7.29.7",
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"@babel/traverse": "^7.29.7",
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"@babel/types": "^7.29.7"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-class-static-block",
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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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