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{"version":3,"names":["react","cloneNode","jsxExpressionContainer","variableDeclaration","variableDeclarator","referenceVisitor","ReferencedIdentifier","path","state","isJSXIdentifier","isCompatTag","node","name","parentPath","isJSXMemberExpression","scope","isFunction","isArrowFunctionExpression","parent","breakOnScopePaths","push","binding","getBinding","violation","constantViolations","mutableBinding","stop","bindings","PathHoister","constructor","scopes","attachAfter","isCompatibleScope","key","Object","keys","bindingIdentifierEquals","identifier","getCompatibleScopes","indexOf","getAttachmentPath","_getAttachmentPath","targetScope","isProgram","hasOwnBinding","kind","parentKey","bindingParentPath","getAttachmentParentForPath","violationPath","pop","hasOwnParamBindings","bodies","get","i","length","_blockHoist","getNextScopeAttachmentParent","Array","isArray","container","isStatement","constant","run","traverse","attachTo","getFunctionParent","uid","generateUidIdentifier","declarator","insertFn","attached","isVariableDeclarator","isJSXElement","children","replaceWith"],"sources":["../../../src/path/lib/hoister.ts"],"sourcesContent":["import { react } from \"@babel/types\";\nimport {\n  cloneNode,\n  jsxExpressionContainer,\n  variableDeclaration,\n  variableDeclarator,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\nimport type Scope from \"../../scope\";\nimport type NodePath from \"../index\";\nimport type Binding from \"../../scope/binding\";\nimport type { Visitor } from \"../../types\";\n\nconst referenceVisitor: Visitor<PathHoister> = {\n  // This visitor looks for bindings to establish a topmost scope for hoisting.\n  ReferencedIdentifier(path, state) {\n    // Don't hoist regular JSX identifiers ('div', 'span', etc).\n    // We do have to consider member expressions for hoisting (e.g. `this.component`)\n    if (\n      path.isJSXIdentifier() &&\n      react.isCompatTag(path.node.name) &&\n      !path.parentPath.isJSXMemberExpression()\n    ) {\n      return;\n    }\n\n    // If the identifier refers to `this`, we need to break on the closest non-arrow scope.\n    if (path.node.name === \"this\") {\n      let scope = path.scope;\n      do {\n        if (\n          scope.path.isFunction() &&\n          !scope.path.isArrowFunctionExpression()\n        ) {\n          break;\n        }\n      } while ((scope = scope.parent));\n      if (scope) state.breakOnScopePaths.push(scope.path);\n    }\n\n    // direct references that we need to track to hoist this to the highest scope we can\n    const binding = path.scope.getBinding(path.node.name);\n    if (!binding) return;\n\n    // we can handle reassignments only if they happen in the same scope as the declaration\n    for (const violation of binding.constantViolations) {\n      if (violation.scope !== binding.path.scope) {\n        state.mutableBinding = true;\n        path.stop();\n        return;\n      }\n    }\n\n    // this binding isn't accessible from the parent scope so we can safely ignore it\n    // eg. it's in a closure etc\n    if (binding !== state.scope.getBinding(path.node.name)) return;\n\n    state.bindings[path.node.name] = binding;\n  },\n};\n\nexport default class PathHoister<T extends t.Node = t.Node> {\n  breakOnScopePaths: NodePath[];\n  bindings: { [k: string]: Binding };\n  mutableBinding: boolean;\n  private scopes: Scope[];\n  scope: Scope;\n  private path: NodePath<T>;\n  private attachAfter: boolean;\n\n  constructor(path: NodePath<T>, scope: Scope) {\n    // Storage for scopes we can't hoist above.\n    this.breakOnScopePaths = [];\n    // Storage for bindings that may affect what path we can hoist to.\n    this.bindings = {};\n    // \"true\" if the current path contains a reference to a binding whose\n    // value can change and thus can't be safely hoisted.\n    this.mutableBinding = false;\n    // Storage for eligible scopes.\n    this.scopes = [];\n    // Our original scope and path.\n    this.scope = scope;\n    this.path = path;\n    // By default, we attach as far up as we can; but if we're trying\n    // to avoid referencing a binding, we may have to go after.\n    this.attachAfter = false;\n  }\n\n  // A scope is compatible if all required bindings are reachable.\n  isCompatibleScope(scope: Scope) {\n    for (const key of Object.keys(this.bindings)) {\n      const binding = this.bindings[key];\n      if (!scope.bindingIdentifierEquals(key, binding.identifier)) {\n        return false;\n      }\n    }\n\n    return true;\n  }\n\n  // Look through all scopes and push compatible ones.\n  getCompatibleScopes() {\n    let scope = this.path.scope;\n    do {\n      if (this.isCompatibleScope(scope)) {\n        this.scopes.push(scope);\n      } else {\n        break;\n      }\n\n      // deopt: These scopes are set in the visitor on const violations\n      if (this.breakOnScopePaths.indexOf(scope.path) >= 0) {\n        break;\n      }\n    } while ((scope = scope.parent));\n  }\n\n  getAttachmentPath() {\n    let path = this._getAttachmentPath();\n    if (!path) return;\n\n    let targetScope = path.scope;\n\n    // don't allow paths that have their own lexical environments to pollute\n    if (targetScope.path === path) {\n      targetScope = path.scope.parent;\n    }\n\n    // avoid hoisting to a scope that contains bindings that are executed after our attachment path\n    if (targetScope.path.isProgram() || targetScope.path.isFunction()) {\n      for (const name of Object.keys(this.bindings)) {\n        // check binding is a direct child of this paths scope\n        if (!targetScope.hasOwnBinding(name)) continue;\n\n        const binding = this.bindings[name];\n\n        // allow parameter references and expressions in params (like destructuring rest)\n        if (binding.kind === \"param\" || binding.path.parentKey === \"params\") {\n          continue;\n        }\n\n        // For each binding, get its attachment parent. This gives us an idea of where we might\n        // introduce conflicts.\n        const bindingParentPath = this.getAttachmentParentForPath(binding.path);\n\n        // If the binding's attachment appears at or after our attachment point, then we move after it.\n        if (bindingParentPath.key >= path.key) {\n          this.attachAfter = true;\n          path = binding.path;\n\n          // We also move past any constant violations.\n          for (const violationPath of binding.constantViolations) {\n            if (this.getAttachmentParentForPath(violationPath).key > path.key) {\n              path = violationPath;\n            }\n          }\n        }\n      }\n    }\n\n    return path;\n  }\n\n  _getAttachmentPath() {\n    const scopes = this.scopes;\n\n    const scope = scopes.pop();\n    // deopt: no compatible scopes\n    if (!scope) return;\n\n    if (scope.path.isFunction()) {\n      if (this.hasOwnParamBindings(scope)) {\n        // deopt: should ignore this scope since it's ourselves\n        if (this.scope === scope) return;\n\n        // needs to be attached to the body\n        const bodies = scope.path.get(\"body\").get(\"body\") as NodePath[];\n        for (let i = 0; i < bodies.length; i++) {\n          // Don't attach to something that's going to get hoisted,\n          // like a default parameter\n          // @ts-expect-error todo(flow->ts): avoid mutating the node, introducing new fields\n          if (bodies[i].node._blockHoist) continue;\n          return bodies[i];\n        }\n        // deopt: If here, no attachment path found\n      } else {\n        // doesn't need to be be attached to this scope\n        return this.getNextScopeAttachmentParent();\n      }\n    } else if (scope.path.isProgram()) {\n      return this.getNextScopeAttachmentParent();\n    }\n  }\n\n  getNextScopeAttachmentParent() {\n    const scope = this.scopes.pop();\n    if (scope) return this.getAttachmentParentForPath(scope.path);\n  }\n\n  // Find an attachment for this path.\n  getAttachmentParentForPath(path: NodePath) {\n    do {\n      if (\n        // Beginning of the scope\n        !path.parentPath ||\n        // Has siblings and is a statement\n        (Array.isArray(path.container) && path.isStatement())\n      ) {\n        return path;\n      }\n    } while ((path = path.parentPath));\n  }\n\n  // Returns true if a scope has param bindings.\n  hasOwnParamBindings(scope: Scope) {\n    for (const name of Object.keys(this.bindings)) {\n      if (!scope.hasOwnBinding(name)) continue;\n\n      const binding = this.bindings[name];\n      // Ensure constant; without it we could place behind a reassignment\n      if (binding.kind === \"param\" && binding.constant) return true;\n    }\n    return false;\n  }\n\n  run() {\n    this.path.traverse(referenceVisitor, this);\n\n    if (this.mutableBinding) return;\n\n    this.getCompatibleScopes();\n\n    const attachTo = this.getAttachmentPath();\n    if (!attachTo) return;\n\n    // don't bother hoisting to the same function as this will cause multiple branches to be\n    // evaluated more than once leading to a bad optimisation\n    if (attachTo.getFunctionParent() === this.path.getFunctionParent()) return;\n\n    // generate declaration and insert it to our point\n    let uid: t.Identifier | t.JSXExpressionContainer =\n      attachTo.scope.generateUidIdentifier(\"ref\");\n\n    // @ts-expect-error todo(flow->ts): more specific type for this.path\n    const declarator = variableDeclarator(uid, this.path.node);\n\n    const insertFn = this.attachAfter ? \"insertAfter\" : \"insertBefore\";\n    const [attached] = attachTo[insertFn]([\n      attachTo.isVariableDeclarator()\n        ? declarator\n        : variableDeclaration(\"var\", [declarator]),\n    ]);\n\n    const parent = this.path.parentPath;\n    if (parent.isJSXElement() && this.path.container === parent.node.children) {\n      // turning the `span` in `<div><span /></div>` to an expression so we need to wrap it with\n      // an expression container\n      uid = jsxExpressionContainer(uid);\n    }\n\n    this.path.replaceWith(cloneNode(uid));\n\n    return attachTo.isVariableDeclarator()\n      ? attached.get(\"init\")\n      : attached.get(\"declarations.0.init\");\n  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