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> Transform optional chaining operators into a series of nil checks
See our website [@babel/plugin-proposal-optional-chaining](https://babeljs.io/docs/en/next/babel-plugin-proposal-optional-chaining.html) for more information.
See our website [@babel/plugin-proposal-optional-chaining](https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining) for more information.
## Install
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"use strict";
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
Object.defineProperty(exports, '__esModule', { value: true });
var _helperPluginUtils = require("@babel/helper-plugin-utils");
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');
var _pluginSyntaxOptionalChaining = _interopRequireDefault(require("@babel/plugin-syntax-optional-chaining"));
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var _core = require("@babel/core");
var syntaxOptionalChaining__default = /*#__PURE__*/_interopDefaultLegacy(syntaxOptionalChaining);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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 = scope.maybeGenerateMemoised(object);
if (context) {
chain.object = core.types.assignmentExpression("=", context, object);
} else if (core.types.isSuper(object)) {
context = core.types.thisExpression();
} 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$assumption2;
var _default = (0, _helperPluginUtils.declare)((api, options) => {
api.assertVersion(7);
const {
loose = false
} = options;
function isSimpleMemberExpression(expression) {
return _core.types.isIdentifier(expression) || _core.types.isSuper(expression) || _core.types.isMemberExpression(expression) && !expression.computed && isSimpleMemberExpression(expression.object);
}
const noDocumentAll = (_api$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: _pluginSyntaxOptionalChaining.default,
inherits: syntaxOptionalChaining__default["default"].default,
visitor: {
"OptionalCallExpression|OptionalMemberExpression"(path) {
const {
scope
} = path;
let maybeParenthesized = path;
const parentPath = path.findParent(p => {
if (!p.isParenthesizedExpression()) return true;
maybeParenthesized = p;
transform(path, {
noDocumentAll,
pureGetters
});
let isDeleteOperation = false;
const parentIsCall = parentPath.isCallExpression({
callee: maybeParenthesized.node
}) && path.isOptionalMemberExpression();
const optionals = [];
let optionalPath = path;
while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression() || optionalPath.isParenthesizedExpression() || optionalPath.isTSNonNullExpression()) {
const {
node
} = optionalPath;
if (node.optional) {
optionals.push(node);
}
if (optionalPath.isOptionalMemberExpression()) {
optionalPath.node.type = "MemberExpression";
optionalPath = optionalPath.get("object");
} else if (optionalPath.isOptionalCallExpression()) {
optionalPath.node.type = "CallExpression";
optionalPath = optionalPath.get("callee");
} else {
optionalPath = optionalPath.get("expression");
}
}
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 replaceKey = isCall ? "callee" : "object";
const chain = node[replaceKey];
let ref;
let check;
if (loose && isCall && isSimpleMemberExpression(chain)) {
check = ref = chain;
} else {
ref = scope.maybeGenerateMemoised(chain);
if (ref) {
check = _core.types.assignmentExpression("=", _core.types.cloneNode(ref), chain);
node[replaceKey] = ref;
} else {
check = ref = chain;
}
}
if (isCall && _core.types.isMemberExpression(chain)) {
if (loose && isSimpleMemberExpression(chain)) {
node.callee = chain;
} else {
const {
object
} = chain;
let context = scope.maybeGenerateMemoised(object);
if (context) {
chain.object = _core.types.assignmentExpression("=", context, object);
} else if (_core.types.isSuper(object)) {
context = _core.types.thisExpression();
} 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
} = replacement;
let baseRef;
if (!loose || !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)]);
}
replacementPath.replaceWith(_core.types.conditionalExpression(loose ? _core.types.binaryExpression("==", _core.types.cloneNode(check), _core.types.nullLiteral()) : _core.types.logicalExpression("||", _core.types.binaryExpression("===", _core.types.cloneNode(check), _core.types.nullLiteral()), _core.types.binaryExpression("===", _core.types.cloneNode(ref), scope.buildUndefinedNode())), isDeleteOperation ? _core.types.booleanLiteral(true) : scope.buildUndefinedNode(), replacement));
replacementPath = replacementPath.get("alternate");
}
}
}
};
});
exports.default = _default;
exports["default"] = index;
exports.transform = transform;
//# sourceMappingURL=index.js.map
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{
"_args": [
[
"@babel/plugin-proposal-optional-chaining@7.10.4",
"/mnt/Foxconn/Digitalent/Deverloper/liff-push_2series"
"@babel/plugin-proposal-optional-chaining@7.18.6",
"/home/node/nuxt"
]
],
"_from": "@babel/plugin-proposal-optional-chaining@7.10.4",
"_id": "@babel/plugin-proposal-optional-chaining@7.10.4",
"_from": "@babel/plugin-proposal-optional-chaining@7.18.6",
"_id": "@babel/plugin-proposal-optional-chaining@7.18.6",
"_inBundle": false,
"_integrity": "sha512-ZIhQIEeavTgouyMSdZRap4VPPHqJJ3NEs2cuHs5p0erH+iz6khB0qfgU8g7UuJkG88+fBMy23ZiU+nuHvekJeQ==",
"_integrity": "sha512-PatI6elL5eMzoypFAiYDpYQyMtXTn+iMhuxxQt5mAXD4fEmKorpSI3PHd+i3JXBJN3xyA6MvJv7at23HffFHwA==",
"_location": "/@babel/plugin-proposal-optional-chaining",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "@babel/plugin-proposal-optional-chaining@7.10.4",
"raw": "@babel/plugin-proposal-optional-chaining@7.18.6",
"name": "@babel/plugin-proposal-optional-chaining",
"escapedName": "@babel%2fplugin-proposal-optional-chaining",
"scope": "@babel",
"rawSpec": "7.10.4",
"rawSpec": "7.18.6",
"saveSpec": null,
"fetchSpec": "7.10.4"
"fetchSpec": "7.18.6"
},
"_requiredBy": [
"/@babel/preset-env"
"/@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining",
"/@babel/preset-env",
"/@nuxt/babel-preset-app"
],
"_resolved": "https://registry.npmjs.org/@babel/plugin-proposal-optional-chaining/-/plugin-proposal-optional-chaining-7.10.4.tgz",
"_spec": "7.10.4",
"_where": "/mnt/Foxconn/Digitalent/Deverloper/liff-push_2series",
"_resolved": "https://registry.npmjs.org/@babel/plugin-proposal-optional-chaining/-/plugin-proposal-optional-chaining-7.18.6.tgz",
"_spec": "7.18.6",
"_where": "/home/node/nuxt",
"author": {
"name": "The Babel Team",
"url": "https://babel.dev/team"
},
"bugs": {
"url": "https://github.com/babel/babel/issues"
},
"dependencies": {
"@babel/helper-plugin-utils": "^7.10.4",
"@babel/plugin-syntax-optional-chaining": "^7.8.0"
"@babel/helper-plugin-utils": "^7.18.6",
"@babel/helper-skip-transparent-expression-wrappers": "^7.18.6",
"@babel/plugin-syntax-optional-chaining": "^7.8.3"
},
"description": "Transform optional chaining operators into a series of nil checks",
"devDependencies": {
"@babel/core": "^7.10.4",
"@babel/helper-plugin-test-runner": "^7.10.4",
"@babel/plugin-transform-block-scoping": "^7.10.4"
"@babel/core": "^7.18.6",
"@babel/helper-plugin-test-runner": "^7.18.6",
"@babel/plugin-transform-block-scoping": "^7.18.6",
"@babel/traverse": "^7.18.6"
},
"gitHead": "7fd40d86a0d03ff0e9c3ea16b29689945433d4df",
"homepage": "https://github.com/babel/babel#readme",
"engines": {
"node": ">=6.9.0"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-optional-chaining",
"keywords": [
"babel-plugin"
],
"license": "MIT",
"main": "lib/index.js",
"main": "./lib/index.js",
"name": "@babel/plugin-proposal-optional-chaining",
"peerDependencies": {
"@babel/core": "^7.0.0-0"
@@ -60,5 +70,6 @@
"url": "git+https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-proposal-optional-chaining"
},
"version": "7.10.4"
"type": "commonjs",
"version": "7.18.6"
}