| 1 | {"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 skipTransparentExprWrapperNodes,\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 = skipTransparentExprWrapperNodes(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 ? 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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 = skipTransparentExprWrapperNodes(replacement.object);\n let baseRef;\n if (!pureGetters || !isSimpleMemberExpression(object)) {\n // memoize the 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