{"version":3,"file":"index.js","sources":["../src/util.js","../src/transform.js","../src/index.js"],"sourcesContent":["import { isTransparentExprWrapper } from \"@babel/helper-skip-transparent-expression-wrappers\";\n/**\n * Test if a NodePath will be cast to boolean when evaluated.\n * It respects transparent expression wrappers defined in\n * \"@babel/helper-skip-transparent-expression-wrappers\"\n *\n * @example\n * // returns true\n * const nodePathADotB = NodePath(\"if (a.b) {}\").get(\"test\"); // a.b\n * willPathCastToBoolean(nodePathADotB)\n * @example\n * // returns false\n * willPathCastToBoolean(NodePath(\"a.b\"))\n * @param {NodePath} path\n * @returns {boolean}\n */\nexport function willPathCastToBoolean(path: NodePath): boolean {\n  const maybeWrapped = findOutermostTransparentParent(path);\n  const { node, parentPath } = maybeWrapped;\n  if (parentPath.isLogicalExpression()) {\n    const { operator, right } = parentPath.node;\n    if (\n      operator === \"&&\" ||\n      operator === \"||\" ||\n      (operator === \"??\" && node === right)\n    ) {\n      return willPathCastToBoolean(parentPath);\n    }\n  }\n  if (parentPath.isSequenceExpression()) {\n    const { expressions } = parentPath.node;\n    if (expressions[expressions.length - 1] === node) {\n      return willPathCastToBoolean(parentPath);\n    } else {\n      // if it is in the middle of a sequence expression, we don't\n      // care the return value so just cast to boolean for smaller\n      // output\n      return true;\n    }\n  }\n  return (\n    parentPath.isConditional({ test: node }) ||\n    parentPath.isUnaryExpression({ operator: \"!\" }) ||\n    parentPath.isLoop({ test: node })\n  );\n}\n\n/**\n * Return the outermost transparent expression wrapper of a given path,\n * otherwise returns path itself.\n * @example\n * const nodePathADotB = NodePath(\"(a.b as any)\").get(\"expression\"); // a.b\n * // returns NodePath(\"(a.b as any)\")\n * findOutermostTransparentParent(nodePathADotB);\n * @param {NodePath} path\n * @returns {NodePath}\n */\nexport function findOutermostTransparentParent(path: NodePath): NodePath {\n  let maybeWrapped = path;\n  path.findParent(p => {\n    if (!isTransparentExprWrapper(p)) return true;\n    maybeWrapped = p;\n  });\n  return maybeWrapped;\n}\n","import { types as t, template } from \"@babel/core\";\nimport {\n  isTransparentExprWrapper,\n  skipTransparentExprWrappers,\n} from \"@babel/helper-skip-transparent-expression-wrappers\";\nimport { willPathCastToBoolean, findOutermostTransparentParent } from \"./util\";\n\nconst { ast } = template.expression;\n\nfunction isSimpleMemberExpression(expression) {\n  expression = skipTransparentExprWrappers(expression);\n  return (\n    t.isIdentifier(expression) ||\n    t.isSuper(expression) ||\n    (t.isMemberExpression(expression) &&\n      !expression.computed &&\n      isSimpleMemberExpression(expression.object))\n  );\n}\n\n/**\n * Test if a given optional chain `path` needs to be memoized\n * @param {NodePath} path\n * @returns {boolean}\n */\nfunction needsMemoize(path) {\n  let optionalPath = path;\n  const { scope } = path;\n  while (\n    optionalPath.isOptionalMemberExpression() ||\n    optionalPath.isOptionalCallExpression()\n  ) {\n    const { node } = optionalPath;\n    const childKey = optionalPath.isOptionalMemberExpression()\n      ? \"object\"\n      : \"callee\";\n    const childPath = skipTransparentExprWrappers(optionalPath.get(childKey));\n    if (node.optional) {\n      return !scope.isStatic(childPath.node);\n    }\n\n    optionalPath = childPath;\n  }\n}\n\nexport function transform(\n  path: NodePath<t.OptionalCallExpression | t.OptionalMemberExpression>,\n  {\n    pureGetters,\n    noDocumentAll,\n  }: { pureGetters: boolean, noDocumentAll: boolean },\n) {\n  const { scope } = path;\n  // maybeWrapped points to the outermost transparent expression wrapper\n  // or the path itself\n  const maybeWrapped = findOutermostTransparentParent(path);\n  const { parentPath } = maybeWrapped;\n  const willReplacementCastToBoolean = willPathCastToBoolean(maybeWrapped);\n  let isDeleteOperation = false;\n  const parentIsCall =\n    parentPath.isCallExpression({ callee: maybeWrapped.node }) &&\n    // note that the first condition must implies that `path.optional` is `true`,\n    // otherwise the parentPath should be an OptionalCallExpression\n    path.isOptionalMemberExpression();\n\n  const optionals = [];\n\n  let optionalPath = path;\n  // Replace `function (a, x = a.b?.c) {}` to `function (a, x = (() => a.b?.c)() ){}`\n  // so the temporary variable can be injected in correct scope\n  if (scope.path.isPattern() && needsMemoize(optionalPath)) {\n    path.replaceWith(template.ast`(() => ${path.node})()`);\n    // The injected optional chain will be queued and eventually transformed when visited\n    return;\n  }\n  while (\n    optionalPath.isOptionalMemberExpression() ||\n    optionalPath.isOptionalCallExpression()\n  ) {\n    const { node } = optionalPath;\n    if (node.optional) {\n      optionals.push(node);\n    }\n\n    if (optionalPath.isOptionalMemberExpression()) {\n      optionalPath.node.type = \"MemberExpression\";\n      optionalPath = skipTransparentExprWrappers(optionalPath.get(\"object\"));\n    } else if (optionalPath.isOptionalCallExpression()) {\n      optionalPath.node.type = \"CallExpression\";\n      optionalPath = skipTransparentExprWrappers(optionalPath.get(\"callee\"));\n    }\n  }\n\n  let replacementPath = path;\n  if (parentPath.isUnaryExpression({ operator: \"delete\" })) {\n    replacementPath = parentPath;\n    isDeleteOperation = true;\n  }\n  for (let i = optionals.length - 1; i >= 0; i--) {\n    const node = optionals[i];\n\n    const isCall = t.isCallExpression(node);\n    const replaceKey = isCall ? \"callee\" : \"object\";\n\n    const chainWithTypes = node[replaceKey];\n    let chain = chainWithTypes;\n\n    while (isTransparentExprWrapper(chain)) {\n      chain = chain.expression;\n    }\n\n    let ref;\n    let check;\n    if (isCall && t.isIdentifier(chain, { name: \"eval\" })) {\n      check = ref = chain;\n      // `eval?.()` is an indirect eval call transformed to `(0,eval)()`\n      node[replaceKey] = t.sequenceExpression([t.numericLiteral(0), ref]);\n    } else if (pureGetters && isCall && isSimpleMemberExpression(chain)) {\n      // If we assume getters are pure (avoiding a Function#call) and we are at the call,\n      // we can avoid a needless memoize. We only do this if the callee is a simple member\n      // expression, to avoid multiple calls to nested call expressions.\n      check = ref = chainWithTypes;\n    } else {\n      ref = scope.maybeGenerateMemoised(chain);\n      if (ref) {\n        check = t.assignmentExpression(\n          \"=\",\n          t.cloneNode(ref),\n          // Here `chainWithTypes` MUST NOT be cloned because it could be\n          // updated when generating the memoised context of a call\n          // expression\n          chainWithTypes,\n        );\n\n        node[replaceKey] = ref;\n      } else {\n        check = ref = chainWithTypes;\n      }\n    }\n\n    // Ensure call expressions have the proper `this`\n    // `foo.bar()` has context `foo`.\n    if (isCall && t.isMemberExpression(chain)) {\n      if (pureGetters && isSimpleMemberExpression(chain)) {\n        // To avoid a Function#call, we can instead re-grab the property from the context object.\n        // `a.?b.?()` translates roughly to `_a.b != null && _a.b()`\n        node.callee = chainWithTypes;\n      } else {\n        // Otherwise, we need to memoize the context object, and change the call into a Function#call.\n        // `a.?b.?()` translates roughly to `(_b = _a.b) != null && _b.call(_a)`\n        const { object } = chain;\n        let context = scope.maybeGenerateMemoised(object);\n        if (context) {\n          chain.object = t.assignmentExpression(\"=\", context, object);\n        } else if (t.isSuper(object)) {\n          context = t.thisExpression();\n        } else {\n          context = object;\n        }\n\n        node.arguments.unshift(t.cloneNode(context));\n        node.callee = t.memberExpression(node.callee, t.identifier(\"call\"));\n      }\n    }\n    let replacement = replacementPath.node;\n    // Ensure (a?.b)() has proper `this`\n    // The `parentIsCall` is constant within loop, we should check i === 0\n    // to ensure that it is only applied to the first optional chain element\n    // i.e. `?.b` in `(a?.b.c)()`\n    if (i === 0 && parentIsCall) {\n      // `(a?.b)()` to `(a == null ? undefined : a.b.bind(a))()`\n      const object = skipTransparentExprWrappers(\n        replacementPath.get(\"object\"),\n      ).node;\n      let baseRef;\n      if (!pureGetters || !isSimpleMemberExpression(object)) {\n        // memoize the context object when getters are not always pure\n        // or the object is not a simple member expression\n        // `(a?.b.c)()` to `(a == null ? undefined : (_a$b = a.b).c.bind(_a$b))()`\n        baseRef = scope.maybeGenerateMemoised(object);\n        if (baseRef) {\n          replacement.object = t.assignmentExpression(\"=\", baseRef, object);\n        }\n      }\n      replacement = t.callExpression(\n        t.memberExpression(replacement, t.identifier(\"bind\")),\n        [t.cloneNode(baseRef ?? object)],\n      );\n    }\n\n    if (willReplacementCastToBoolean) {\n      // `if (a?.b) {}` transformed to `if (a != null && a.b) {}`\n      // we don't need to return `void 0` because the returned value will\n      // eveutally cast to boolean.\n      const nonNullishCheck = noDocumentAll\n        ? ast`${t.cloneNode(check)} != null`\n        : ast`\n            ${t.cloneNode(check)} !== null && ${t.cloneNode(ref)} !== void 0`;\n      replacementPath.replaceWith(\n        t.logicalExpression(\"&&\", nonNullishCheck, replacement),\n      );\n      replacementPath = skipTransparentExprWrappers(\n        replacementPath.get(\"right\"),\n      );\n    } else {\n      const nullishCheck = noDocumentAll\n        ? ast`${t.cloneNode(check)} == null`\n        : ast`\n            ${t.cloneNode(check)} === null || ${t.cloneNode(ref)} === void 0`;\n\n      const returnValue = isDeleteOperation ? ast`true` : ast`void 0`;\n      replacementPath.replaceWith(\n        t.conditionalExpression(nullishCheck, returnValue, replacement),\n      );\n      replacementPath = skipTransparentExprWrappers(\n        replacementPath.get(\"alternate\"),\n    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