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self : global\n conditionalExpression(\n binaryExpression(\n \"===\",\n unaryExpression(\"typeof\", identifier(\"global\")),\n stringLiteral(\"undefined\"),\n ),\n identifier(\"self\"),\n identifier(\"global\"),\n ),\n ]),\n ),\n ]);\n\n body.push(\n variableDeclaration(\"var\", [\n variableDeclarator(\n namespace,\n assignmentExpression(\n \"=\",\n memberExpression(identifier(\"global\"), namespace),\n objectExpression([]),\n ),\n ),\n ]),\n );\n\n buildHelpers(body, namespace, allowlist);\n\n return tree;\n}\n\nfunction buildModule(allowlist?: Array) {\n const body: t.Statement[] = [];\n const refs = buildHelpers(body, null, allowlist);\n\n body.unshift(\n exportNamedDeclaration(\n null,\n Object.keys(refs).map(name => {\n return exportSpecifier(cloneNode(refs[name]), identifier(name));\n }),\n ),\n );\n\n return program(body, [], \"module\");\n}\n\nfunction buildUmd(allowlist?: Array) {\n const namespace = identifier(\"babelHelpers\");\n\n const body: t.Statement[] = [];\n body.push(\n variableDeclaration(\"var\", [\n variableDeclarator(namespace, identifier(\"global\")),\n ]),\n );\n\n buildHelpers(body, namespace, allowlist);\n\n return program([\n buildUmdWrapper({\n FACTORY_PARAMETERS: identifier(\"global\"),\n BROWSER_ARGUMENTS: assignmentExpression(\n \"=\",\n memberExpression(identifier(\"root\"), namespace),\n objectExpression([]),\n ),\n COMMON_ARGUMENTS: identifier(\"exports\"),\n AMD_ARGUMENTS: arrayExpression([stringLiteral(\"exports\")]),\n FACTORY_BODY: body,\n UMD_ROOT: identifier(\"this\"),\n }),\n ]);\n}\n\nfunction buildVar(allowlist?: Array) {\n const namespace = identifier(\"babelHelpers\");\n\n const body: t.Statement[] = [];\n body.push(\n variableDeclaration(\"var\", [\n variableDeclarator(namespace, objectExpression([])),\n ]),\n );\n const tree = program(body);\n buildHelpers(body, namespace, allowlist);\n body.push(expressionStatement(namespace));\n return tree;\n}\n\nfunction buildHelpers(\n body: t.Statement[],\n namespace: t.Expression,\n allowlist?: Array,\n): Record;\nfunction buildHelpers(\n body: t.Statement[],\n namespace: null,\n allowlist?: Array,\n): Record;\n\nfunction buildHelpers(\n body: t.Statement[],\n namespace: t.Expression | null,\n allowlist?: Array,\n) {\n const getHelperReference = (name: string) => {\n return namespace\n ? memberExpression(namespace, identifier(name))\n : identifier(`_${name}`);\n };\n\n const refs: { [key: string]: t.Identifier | t.MemberExpression } = {};\n helpers.list.forEach(function (name) {\n if (allowlist && !allowlist.includes(name)) return;\n\n const ref = (refs[name] = getHelperReference(name));\n\n const { nodes } = helpers.get(\n name,\n getHelperReference,\n namespace ? null : `_${name}`,\n [],\n namespace\n ? (ast, exportName, mapExportBindingAssignments) => {\n mapExportBindingAssignments(node =>\n assignmentExpression(\"=\", ref, node),\n );\n ast.body.push(\n expressionStatement(\n assignmentExpression(\"=\", ref, identifier(exportName)),\n ),\n );\n }\n : null,\n );\n\n body.push(...nodes);\n });\n return refs;\n}\nexport default function (\n allowlist?: Array,\n outputType: \"global\" | \"module\" | \"umd\" | \"var\" = \"global\",\n) {\n let tree: t.Program;\n\n const build = {\n global: buildGlobal,\n module: buildModule,\n umd: buildUmd,\n var: buildVar,\n }[outputType];\n\n if (build) {\n tree = build(allowlist);\n } else {\n throw new Error(`Unsupported output type ${outputType}`);\n }\n\n return 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