290 lines
8 KiB
JavaScript
290 lines
8 KiB
JavaScript
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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.get = get;
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exports.minVersion = minVersion;
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exports.getDependencies = getDependencies;
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exports.ensure = ensure;
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exports.default = exports.list = void 0;
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function _traverse() {
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const data = _interopRequireDefault(require("@babel/traverse"));
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_traverse = function () {
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return data;
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};
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return data;
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}
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function t() {
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const data = _interopRequireWildcard(require("@babel/types"));
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t = function () {
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return data;
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};
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return data;
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}
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var _helpers = _interopRequireDefault(require("./helpers"));
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function makePath(path) {
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const parts = [];
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for (; path.parentPath; path = path.parentPath) {
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parts.push(path.key);
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if (path.inList) parts.push(path.listKey);
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}
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return parts.reverse().join(".");
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}
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function getHelperMetadata(file) {
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const globals = new Set();
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const localBindingNames = new Set();
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const dependencies = new Map();
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let exportName;
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let exportPath;
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const exportBindingAssignments = [];
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const importPaths = [];
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const importBindingsReferences = [];
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(0, _traverse().default)(file, {
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ImportDeclaration(child) {
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const name = child.node.source.value;
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if (!_helpers.default[name]) {
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throw child.buildCodeFrameError(`Unknown helper ${name}`);
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}
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if (child.get("specifiers").length !== 1 || !child.get("specifiers.0").isImportDefaultSpecifier()) {
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throw child.buildCodeFrameError("Helpers can only import a default value");
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}
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const bindingIdentifier = child.node.specifiers[0].local;
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dependencies.set(bindingIdentifier, name);
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importPaths.push(makePath(child));
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},
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ExportDefaultDeclaration(child) {
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const decl = child.get("declaration");
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if (decl.isFunctionDeclaration()) {
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if (!decl.node.id) {
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throw decl.buildCodeFrameError("Helpers should give names to their exported func declaration");
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}
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exportName = decl.node.id.name;
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}
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exportPath = makePath(child);
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},
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ExportAllDeclaration(child) {
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throw child.buildCodeFrameError("Helpers can only export default");
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},
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ExportNamedDeclaration(child) {
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throw child.buildCodeFrameError("Helpers can only export default");
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},
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Statement(child) {
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if (child.isModuleDeclaration()) return;
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child.skip();
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}
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});
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(0, _traverse().default)(file, {
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Program(path) {
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const bindings = path.scope.getAllBindings();
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Object.keys(bindings).forEach(name => {
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if (name === exportName) return;
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if (dependencies.has(bindings[name].identifier)) return;
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localBindingNames.add(name);
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});
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},
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ReferencedIdentifier(child) {
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const name = child.node.name;
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const binding = child.scope.getBinding(name, true);
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if (!binding) {
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globals.add(name);
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} else if (dependencies.has(binding.identifier)) {
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importBindingsReferences.push(makePath(child));
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}
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},
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AssignmentExpression(child) {
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const left = child.get("left");
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if (!(exportName in left.getBindingIdentifiers())) return;
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if (!left.isIdentifier()) {
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throw left.buildCodeFrameError("Only simple assignments to exports are allowed in helpers");
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}
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const binding = child.scope.getBinding(exportName);
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if (binding && binding.scope.path.isProgram()) {
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exportBindingAssignments.push(makePath(child));
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}
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}
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});
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if (!exportPath) throw new Error("Helpers must default-export something.");
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exportBindingAssignments.reverse();
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return {
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globals: Array.from(globals),
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localBindingNames: Array.from(localBindingNames),
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dependencies,
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exportBindingAssignments,
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exportPath,
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exportName,
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importBindingsReferences,
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importPaths
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};
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}
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function permuteHelperAST(file, metadata, id, localBindings, getDependency) {
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if (localBindings && !id) {
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throw new Error("Unexpected local bindings for module-based helpers.");
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}
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if (!id) return;
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const {
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localBindingNames,
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dependencies,
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exportBindingAssignments,
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exportPath,
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exportName,
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importBindingsReferences,
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importPaths
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} = metadata;
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const dependenciesRefs = {};
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dependencies.forEach((name, id) => {
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dependenciesRefs[id.name] = typeof getDependency === "function" && getDependency(name) || id;
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});
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const toRename = {};
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const bindings = new Set(localBindings || []);
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localBindingNames.forEach(name => {
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let newName = name;
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while (bindings.has(newName)) newName = "_" + newName;
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if (newName !== name) toRename[name] = newName;
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});
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if (id.type === "Identifier" && exportName !== id.name) {
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toRename[exportName] = id.name;
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}
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(0, _traverse().default)(file, {
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Program(path) {
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const exp = path.get(exportPath);
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const imps = importPaths.map(p => path.get(p));
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const impsBindingRefs = importBindingsReferences.map(p => path.get(p));
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const decl = exp.get("declaration");
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if (id.type === "Identifier") {
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if (decl.isFunctionDeclaration()) {
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exp.replaceWith(decl);
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} else {
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exp.replaceWith(t().variableDeclaration("var", [t().variableDeclarator(id, decl.node)]));
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}
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} else if (id.type === "MemberExpression") {
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if (decl.isFunctionDeclaration()) {
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exportBindingAssignments.forEach(assignPath => {
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const assign = path.get(assignPath);
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assign.replaceWith(t().assignmentExpression("=", id, assign.node));
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});
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exp.replaceWith(decl);
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path.pushContainer("body", t().expressionStatement(t().assignmentExpression("=", id, t().identifier(exportName))));
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} else {
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exp.replaceWith(t().expressionStatement(t().assignmentExpression("=", id, decl.node)));
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}
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} else {
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throw new Error("Unexpected helper format.");
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}
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Object.keys(toRename).forEach(name => {
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path.scope.rename(name, toRename[name]);
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});
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for (const path of imps) path.remove();
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for (const path of impsBindingRefs) {
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const node = t().cloneNode(dependenciesRefs[path.node.name]);
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path.replaceWith(node);
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}
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path.stop();
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}
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});
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}
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const helperData = Object.create(null);
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function loadHelper(name) {
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if (!helperData[name]) {
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const helper = _helpers.default[name];
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if (!helper) {
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throw Object.assign(new ReferenceError(`Unknown helper ${name}`), {
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code: "BABEL_HELPER_UNKNOWN",
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helper: name
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});
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}
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const fn = () => {
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return t().file(helper.ast());
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};
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const metadata = getHelperMetadata(fn());
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helperData[name] = {
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build(getDependency, id, localBindings) {
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const file = fn();
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permuteHelperAST(file, metadata, id, localBindings, getDependency);
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return {
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nodes: file.program.body,
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globals: metadata.globals
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};
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},
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minVersion() {
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return helper.minVersion;
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},
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dependencies: metadata.dependencies
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};
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}
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return helperData[name];
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}
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function get(name, getDependency, id, localBindings) {
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return loadHelper(name).build(getDependency, id, localBindings);
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}
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function minVersion(name) {
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return loadHelper(name).minVersion();
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}
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function getDependencies(name) {
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return Array.from(loadHelper(name).dependencies.values());
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}
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function ensure(name) {
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loadHelper(name);
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}
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const list = Object.keys(_helpers.default).map(name => name.replace(/^_/, "")).filter(name => name !== "__esModule");
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exports.list = list;
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var _default = get;
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exports.default = _default;
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