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MIT License
Copyright (c) 2014-present Sebastian McKenzie and other contributors
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# @babel/plugin-proposal-optional-chaining
> Transform optional chaining operators into a series of nil checks
See our website [@babel/plugin-proposal-optional-chaining](https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-proposal-optional-chaining
```
or using yarn:
```sh
yarn add @babel/plugin-proposal-optional-chaining --dev
```
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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var helperPluginUtils = require('@babel/helper-plugin-utils');
var syntaxOptionalChaining = require('@babel/plugin-syntax-optional-chaining');
var core = require('@babel/core');
var helperSkipTransparentExpressionWrappers = require('@babel/helper-skip-transparent-expression-wrappers');
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var syntaxOptionalChaining__default = /*#__PURE__*/_interopDefaultLegacy(syntaxOptionalChaining);
function willPathCastToBoolean(path) {
const maybeWrapped = findOutermostTransparentParent(path);
const {
node,
parentPath
} = maybeWrapped;
if (parentPath.isLogicalExpression()) {
const {
operator,
right
} = parentPath.node;
if (operator === "&&" || operator === "||" || operator === "??" && node === right) {
return willPathCastToBoolean(parentPath);
}
}
if (parentPath.isSequenceExpression()) {
const {
expressions
} = parentPath.node;
if (expressions[expressions.length - 1] === node) {
return willPathCastToBoolean(parentPath);
} else {
return true;
}
}
return parentPath.isConditional({
test: node
}) || parentPath.isUnaryExpression({
operator: "!"
}) || parentPath.isLoop({
test: node
});
}
function findOutermostTransparentParent(path) {
let maybeWrapped = path;
path.findParent(p => {
if (!helperSkipTransparentExpressionWrappers.isTransparentExprWrapper(p.node)) return true;
maybeWrapped = p;
});
return maybeWrapped;
}
const {
ast
} = core.template.expression;
function isSimpleMemberExpression(expression) {
expression = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(expression);
return core.types.isIdentifier(expression) || core.types.isSuper(expression) || core.types.isMemberExpression(expression) && !expression.computed && isSimpleMemberExpression(expression.object);
}
function needsMemoize(path) {
let optionalPath = path;
const {
scope
} = path;
while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
const {
node
} = optionalPath;
const childPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.isOptionalMemberExpression() ? optionalPath.get("object") : optionalPath.get("callee"));
if (node.optional) {
return !scope.isStatic(childPath.node);
}
optionalPath = childPath;
}
}
function transform(path, {
pureGetters,
noDocumentAll
}) {
const {
scope
} = path;
const maybeWrapped = findOutermostTransparentParent(path);
const {
parentPath
} = maybeWrapped;
const willReplacementCastToBoolean = willPathCastToBoolean(maybeWrapped);
let isDeleteOperation = false;
const parentIsCall = parentPath.isCallExpression({
callee: maybeWrapped.node
}) && path.isOptionalMemberExpression();
const optionals = [];
let optionalPath = path;
if (scope.path.isPattern() && needsMemoize(optionalPath)) {
path.replaceWith(core.template.ast`(() => ${path.node})()`);
return;
}
while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
const {
node
} = optionalPath;
if (node.optional) {
optionals.push(node);
}
if (optionalPath.isOptionalMemberExpression()) {
optionalPath.node.type = "MemberExpression";
optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("object"));
} else if (optionalPath.isOptionalCallExpression()) {
optionalPath.node.type = "CallExpression";
optionalPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(optionalPath.get("callee"));
}
}
let replacementPath = path;
if (parentPath.isUnaryExpression({
operator: "delete"
})) {
replacementPath = parentPath;
isDeleteOperation = true;
}
for (let i = optionals.length - 1; i >= 0; i--) {
const node = optionals[i];
const isCall = core.types.isCallExpression(node);
const chainWithTypes = isCall ? node.callee : node.object;
const chain = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(chainWithTypes);
let ref;
let check;
if (isCall && core.types.isIdentifier(chain, {
name: "eval"
})) {
check = ref = chain;
node.callee = core.types.sequenceExpression([core.types.numericLiteral(0), ref]);
} else if (pureGetters && isCall && isSimpleMemberExpression(chain)) {
check = ref = node.callee;
} else {
ref = scope.maybeGenerateMemoised(chain);
if (ref) {
check = core.types.assignmentExpression("=", core.types.cloneNode(ref), chainWithTypes);
isCall ? node.callee = ref : node.object = ref;
} else {
check = ref = chainWithTypes;
}
}
if (isCall && core.types.isMemberExpression(chain)) {
if (pureGetters && isSimpleMemberExpression(chain)) {
node.callee = chainWithTypes;
} else {
const {
object
} = chain;
let context;
if (core.types.isSuper(object)) {
context = core.types.thisExpression();
} else {
const memoized = scope.maybeGenerateMemoised(object);
if (memoized) {
context = memoized;
chain.object = core.types.assignmentExpression("=", memoized, object);
} else {
context = object;
}
}
node.arguments.unshift(core.types.cloneNode(context));
node.callee = core.types.memberExpression(node.callee, core.types.identifier("call"));
}
}
let replacement = replacementPath.node;
if (i === 0 && parentIsCall) {
var _baseRef;
const object = helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes(replacement.object);
let baseRef;
if (!pureGetters || !isSimpleMemberExpression(object)) {
baseRef = scope.maybeGenerateMemoised(object);
if (baseRef) {
replacement.object = core.types.assignmentExpression("=", baseRef, object);
}
}
replacement = core.types.callExpression(core.types.memberExpression(replacement, core.types.identifier("bind")), [core.types.cloneNode((_baseRef = baseRef) != null ? _baseRef : object)]);
}
if (willReplacementCastToBoolean) {
const nonNullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} != null` : ast`
${core.types.cloneNode(check)} !== null && ${core.types.cloneNode(ref)} !== void 0`;
replacementPath.replaceWith(core.types.logicalExpression("&&", nonNullishCheck, replacement));
replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(replacementPath.get("right"));
} else {
const nullishCheck = noDocumentAll ? ast`${core.types.cloneNode(check)} == null` : ast`
${core.types.cloneNode(check)} === null || ${core.types.cloneNode(ref)} === void 0`;
const returnValue = isDeleteOperation ? ast`true` : ast`void 0`;
replacementPath.replaceWith(core.types.conditionalExpression(nullishCheck, returnValue, replacement));
replacementPath = helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers(replacementPath.get("alternate"));
}
}
}
var index = helperPluginUtils.declare((api, options) => {
var _api$assumption, _api$assumption2;
api.assertVersion(7);
const {
loose = false
} = options;
const noDocumentAll = (_api$assumption = api.assumption("noDocumentAll")) != null ? _api$assumption : loose;
const pureGetters = (_api$assumption2 = api.assumption("pureGetters")) != null ? _api$assumption2 : loose;
return {
name: "proposal-optional-chaining",
inherits: syntaxOptionalChaining__default["default"].default,
visitor: {
"OptionalCallExpression|OptionalMemberExpression"(path) {
transform(path, {
noDocumentAll,
pureGetters
});
}
}
};
});
exports["default"] = index;
exports.transform = transform;
//# sourceMappingURL=index.js.map
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{"version":3,"file":"index.js","sources":["../src/util.ts","../src/transform.ts","../src/index.ts"],"sourcesContent":["import type { NodePath } from \"@babel/traverse\";\nimport { 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.node)) return true;\n maybeWrapped = p;\n });\n return maybeWrapped;\n}\n","import { types as t, template } from \"@babel/core\";\nimport type { NodePath } from \"@babel/traverse\";\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(\n expression: t.Expression | t.Super,\n): expression is t.Identifier | t.Super | t.MemberExpression {\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(\n path: NodePath<t.OptionalCallExpression | t.OptionalMemberExpression>,\n) {\n let optionalPath: NodePath = path;\n const { scope } = path;\n while (\n optionalPath.isOptionalMemberExpression() ||\n optionalPath.isOptionalCallExpression()\n ) {\n const { node } = optionalPath;\n const childPath = skipTransparentExprWrappers(\n // @ts-expect-error isOptionalMemberExpression does not work with NodePath union\n optionalPath.isOptionalMemberExpression()\n ? optionalPath.get(\"object\")\n : optionalPath.get(\"callee\"),\n );\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 beLine truncated
@@ -0,0 +1,38 @@
{
"name": "@babel/plugin-proposal-optional-chaining",
"version": "7.18.9",
"description": "Transform optional chaining operators into a series of nil checks",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-proposal-optional-chaining"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-optional-chaining",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"keywords": [
"babel-plugin"
],
"dependencies": {
"@babel/helper-plugin-utils": "^7.18.9",
"@babel/helper-skip-transparent-expression-wrappers": "^7.18.9",
"@babel/plugin-syntax-optional-chaining": "^7.8.3"
},
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "^7.18.9",
"@babel/helper-plugin-test-runner": "^7.18.6",
"@babel/plugin-transform-block-scoping": "^7.18.9",
"@babel/traverse": "^7.18.9"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "commonjs"
}