hexo/node_modules/@babel/plugin-transform-block-scoping/lib/annex-B_3_3.js.map

{"version":3,"names":["annexB33FunctionsVisitor","VariableDeclaration","path","isStrict","node","kind","varScope","scope","getFunctionParent","getProgramParent","traverse","functionsToVarVisitor","names","Object","keys","getBindingIdentifiers","BlockStatement","t","isFunction","parent","body","transformStatementList","get","SwitchCase","paths","outer","isFunctionDeclaration","async","generator","parentPath","isVarScope","name","id","currScope","hasOwnBinding","maybeTransformBlockScopedFunction","removeOwnBinding","varNode","variableDeclaration","variableDeclarator","toExpression","_blockHoist","varPath","replaceWith","registerDeclaration","Scope","binding","getOwnBinding","skip","isFunctionParent","isProgram","find","sourceType","isClass","isBlockStatement","directives","some","directive","value"],"sources":["../src/annex-B_3_3.ts"],"sourcesContent":["import { types as t } from \"@babel/core\";\nimport type { NodePath, Visitor, Scope } from \"@babel/traverse\";\n\n// Whenever a function declaration in a nested block scope\n// doesn't conflict with a block-scoped binding from an outer\n// scope, we transform it to a variable declaration.\n//\n// This implements the Annex B.3.3 behavior.\n//\n// TODO(Babel 8): Figure out how this should interact with\n// the transform-block-scoped functions plugin (it feels\n// wrong to handle this transform here), and what we want\n// to do with Annex B behavior in general.\n\n// To avoid confusing block-scoped variables transformed to\n// var with original vars, this transformation happens in two\n// different places:\n//   1. For functions that \"conflict\" with var-variables, in\n//      the VariableDeclaration visitor.\n//   2. For functions that don't conflict with any variable,\n//      in the FunctionDeclaration visitor.\n\nexport const annexB33FunctionsVisitor: Visitor = {\n  VariableDeclaration(path) {\n    if (isStrict(path)) return;\n    if (path.node.kind !== \"var\") return;\n\n    const varScope =\n      path.scope.getFunctionParent() || path.scope.getProgramParent();\n    // eslint-disable-next-line @typescript-eslint/no-use-before-define\n    varScope.path.traverse(functionsToVarVisitor, {\n      names: Object.keys(path.getBindingIdentifiers()),\n    });\n  },\n\n  // NOTE: These two visitors target the same nodes as the\n  // block-scoped-functions plugin\n\n  BlockStatement(path) {\n    if (isStrict(path)) return;\n    if (t.isFunction(path.parent, { body: path.node })) return;\n    transformStatementList(path.get(\"body\"));\n  },\n\n  SwitchCase(path) {\n    if (isStrict(path)) return;\n    transformStatementList(path.get(\"consequent\"));\n  },\n};\n\nfunction transformStatementList(paths: NodePath<t.Statement>[]) {\n  outer: for (const path of paths) {\n    if (!path.isFunctionDeclaration()) continue;\n    // Annex B.3.3 only applies to plain functions.\n    if (path.node.async || path.node.generator) return;\n\n    const { scope } = path.parentPath;\n    if (isVarScope(scope)) return;\n\n    const { name } = path.node.id;\n    let currScope = scope;\n    do {\n      if (currScope.parent.hasOwnBinding(name)) continue outer;\n      currScope = currScope.parent;\n    } while (!isVarScope(currScope));\n\n    maybeTransformBlockScopedFunction(path);\n  }\n}\n\nfunction maybeTransformBlockScopedFunction(\n  path: NodePath<t.FunctionDeclaration>,\n) {\n  const {\n    node,\n    parentPath: { scope },\n  } = path;\n\n  const { id } = node;\n  scope.removeOwnBinding(id.name);\n  node.id = null;\n\n  const varNode = t.variableDeclaration(\"var\", [\n    t.variableDeclarator(id, t.toExpression(node)),\n  ]);\n  // @ts-expect-error undocumented property\n  varNode._blockHoist = 2;\n\n  const [varPath] = path.replaceWith(varNode);\n  scope.registerDeclaration(varPath);\n}\n\nconst functionsToVarVisitor: Visitor<{ names: string[] }> = {\n  Scope(path, { names }) {\n    for (const name of names) {\n      const binding = path.scope.getOwnBinding(name);\n      if (binding && binding.kind === \"hoisted\") {\n        maybeTransformBlockScopedFunction(\n          binding.path as NodePath<t.FunctionDeclaration>,\n        );\n      }\n    }\n  },\n  \"Expression|Declaration\"(path) {\n    path.skip();\n  },\n};\n\nexport function isVarScope(scope: Scope) {\n  return scope.path.isFunctionParent() || scope.path.isProgram();\n}\n\nfunction isStrict(path: NodePath) {\n  return !!path.find(({ node }) => {\n    if (t.isProgram(node)) {\n      if (node.sourceType === \"module\") return true;\n    } else if (t.isClass(node)) {\n      return true;\n    } else if (!t.isBlockStatement(node)) {\n      return false;\n    }\n\n    return node.directives?.some(\n      directive => directive.value.value === \"use strict\",\n    );\n  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