{"version":3,"names":["buildDefaultParam","template","statement","buildLooseDefaultParam","buildLooseDestructuredDefaultParam","buildSafeArgumentsAccess","convertFunctionParams","path","ignoreFunctionLength","shouldTransformParam","replaceRestElement","params","get","isSimpleParameterList","every","param","isIdentifier","node","scope","body","shadowedParams","Set","collectShadowedParamsNames","state","needsOuterBinding","size","traverse","iifeVisitor","firstOptionalIndex","i","length","transformedRestNodes","paramIsAssignmentPattern","isAssignmentPattern","t","isMethod","kind","left","right","undefinedNode","buildUndefinedNode","push","ASSIGNMENT_IDENTIFIER","cloneNode","DEFAULT_VALUE","UNDEFINED","replaceWith","isObjectPattern","isArrayPattern","paramName","generateUidIdentifier","PARAMETER_NAME","defNode","VARIABLE_NAME","ARGUMENT_KEY","numericLiteral","uid","typeAnnotation","variableDeclaration","variableDeclarator","transformedNode","slice","ensureBlock","async","generator","buildScopeIIFE","set","blockStatement","bodyPath","arrowPath","arrowFunctionToExpression","ast","unshiftContainer"],"sources":["../src/params.ts"],"sourcesContent":["import { template, types as t } from \"@babel/core\";\nimport type { NodePath } from \"@babel/traverse\";\n\nimport {\n  iifeVisitor,\n  collectShadowedParamsNames,\n  buildScopeIIFE,\n} from \"./shadow-utils\";\n\nconst buildDefaultParam = template.statement(`\n  let VARIABLE_NAME =\n    arguments.length > ARGUMENT_KEY && arguments[ARGUMENT_KEY] !== undefined ?\n      arguments[ARGUMENT_KEY]\n    :\n      DEFAULT_VALUE;\n`);\n\nconst buildLooseDefaultParam = template.statement(`\n  if (ASSIGNMENT_IDENTIFIER === UNDEFINED) {\n    ASSIGNMENT_IDENTIFIER = DEFAULT_VALUE;\n  }\n`);\n\nconst buildLooseDestructuredDefaultParam = template.statement(`\n  let ASSIGNMENT_IDENTIFIER = PARAMETER_NAME === UNDEFINED ? DEFAULT_VALUE : PARAMETER_NAME ;\n`);\n\nconst buildSafeArgumentsAccess = template.statement(`\n  let $0 = arguments.length > $1 ? arguments[$1] : undefined;\n`);\n\n// last 2 parameters are optional -- they are used by proposal-object-rest-spread/src/index.js\nexport default function convertFunctionParams(\n  path: NodePath<t.Function>,\n  ignoreFunctionLength: boolean | void,\n  shouldTransformParam?: (index: number) => boolean,\n  replaceRestElement?: (\n    path: NodePath<t.Function>,\n    paramPath: NodePath<t.Function[\"params\"][number]>,\n    transformedRestNodes: t.Statement[],\n  ) => void,\n) {\n  const params = path.get(\"params\");\n\n  const isSimpleParameterList = params.every(param => param.isIdentifier());\n  if (isSimpleParameterList) return false;\n\n  const { node, scope } = path;\n\n  const body = [];\n  const shadowedParams = new Set<string>();\n\n  for (const param of params) {\n    collectShadowedParamsNames(param, scope, shadowedParams);\n  }\n\n  const state = {\n    needsOuterBinding: false,\n    scope,\n  };\n  if (shadowedParams.size === 0) {\n    for (const param of params) {\n      if (!param.isIdentifier()) param.traverse(iifeVisitor, state);\n      if (state.needsOuterBinding) break;\n    }\n  }\n\n  let firstOptionalIndex = null;\n\n  for (let i = 0; i < params.length; i++) {\n    const param = params[i];\n\n    if (shouldTransformParam && !shouldTransformParam(i)) {\n      continue;\n    }\n    const transformedRestNodes: t.Statement[] = [];\n    if (replaceRestElement) {\n      replaceRestElement(path, param, transformedRestNodes);\n    }\n\n    const paramIsAssignmentPattern = param.isAssignmentPattern();\n    if (\n      paramIsAssignmentPattern &&\n      (ignoreFunctionLength || t.isMethod(node, { kind: \"set\" }))\n    ) {\n      const left = param.get(\"left\");\n      const right = param.get(\"right\");\n\n      const undefinedNode = scope.buildUndefinedNode();\n\n      if (left.isIdentifier()) {\n        body.push(\n          buildLooseDefaultParam({\n            ASSIGNMENT_IDENTIFIER: t.cloneNode(left.node),\n            DEFAULT_VALUE: right.node,\n            UNDEFINED: undefinedNode,\n          }),\n        );\n        param.replaceWith(left.node);\n      } else if (left.isObjectPattern() || left.isArrayPattern()) {\n        const paramName = scope.generateUidIdentifier();\n        body.push(\n          buildLooseDestructuredDefaultParam({\n            ASSIGNMENT_IDENTIFIER: left.node,\n            DEFAULT_VALUE: right.node,\n            PARAMETER_NAME: t.cloneNode(paramName),\n            UNDEFINED: undefinedNode,\n          }),\n        );\n        param.replaceWith(paramName);\n      }\n    } else if (paramIsAssignmentPattern) {\n      if (firstOptionalIndex === null) firstOptionalIndex = i;\n\n      const left = param.get(\"left\");\n      const right = param.get(\"right\");\n\n      const defNode = buildDefaultParam({\n        VARIABLE_NAME: left.node,\n        DEFAULT_VALUE: right.node,\n        ARGUMENT_KEY: t.numericLiteral(i),\n      });\n      body.push(defNode);\n    } else if (firstOptionalIndex !== null) {\n      const defNode = buildSafeArgumentsAccess([\n        param.node,\n        t.numericLiteral(i),\n      ]);\n      body.push(defNode);\n    } else if (param.isObjectPattern() || param.isArrayPattern()) {\n      const uid = path.scope.generateUidIdentifier(\"ref\");\n      uid.typeAnnotation = param.node.typeAnnotation;\n\n      const defNode = t.variableDeclaration(\"let\", [\n        t.variableDeclarator(param.node, uid),\n      ]);\n      body.push(defNode);\n\n      param.replaceWith(t.cloneNode(uid));\n    }\n\n    if (transformedRestNodes) {\n      for (const transformedNode of transformedRestNodes) {\n        body.push(transformedNode);\n      }\n    }\n  }\n\n  // we need to cut off all trailing parameters\n  if (firstOptionalIndex !== null) {\n    node.params = node.params.slice(0, firstOptionalIndex);\n  }\n\n  // ensure it's a block, useful for arrow functions\n  path.ensureBlock();\n\n  const { async, generator } = node;\n  if (generator || state.needsOuterBinding || shadowedParams.size > 0) {\n    body.push(buildScopeIIFE(shadowedParams, path.node.body));\n\n    path.set(\"body\", t.blockStatement(body as t.Statement[]));\n\n    // We inject an arrow and then transform it to a normal function, to be\n    // sure that we correctly handle this and arguments.\n    const bodyPath = path.get(\"body.body\") as NodePath<t.Statement>[];\n    const arrowPath = bodyPath[bodyPath.length - 1].get(\n      \"argument.callee\",\n    ) as NodePath<t.ArrowFunctionExpression>;\n\n    // This is an IIFE, so we don't need to worry about the noNewArrows assumption\n    arrowPath.arrowFunctionToExpression();\n\n    arrowPath.node.generator = generator;\n    arrowPath.node.async = async;\n\n    node.generator = false;\n    node.async = false;\n    if (async) {\n      // If the default value of a parameter throws, it must reject asynchronously.\n      path.node.body = template.statement.ast`{\n        try {\n          ${path.node.body.body}\n        } catch (e) {\n          return Promise.reject(e);\n        }\n      }` as t.BlockStatement;\n    }\n  } else {\n    path.get(\"body\").unshiftContainer(\"body\", body);\n  }\n\n  return 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