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node_modules/@babel/plugin-transform-optional-chaining/lib/transform.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.transform = transform;
+exports.transformOptionalChain = transformOptionalChain;
+var _core = require("@babel/core");
+var _helperSkipTransparentExpressionWrappers = require("@babel/helper-skip-transparent-expression-wrappers");
+var _util = require("./util");
+function isSimpleMemberExpression(expression) {
+  expression = (0, _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 = (0, _helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers)(optionalPath.isOptionalMemberExpression() ? optionalPath.get("object") : optionalPath.get("callee"));
+    if (node.optional) {
+      return !scope.isStatic(childPath.node);
+    }
+    optionalPath = childPath;
+  }
+}
+const NULLISH_CHECK = _core.template.expression(`%%check%% === null || %%ref%% === void 0`);
+const NULLISH_CHECK_NO_DDA = _core.template.expression(`%%check%% == null`);
+const NULLISH_CHECK_NEG = _core.template.expression(`%%check%% !== null && %%ref%% !== void 0`);
+const NULLISH_CHECK_NO_DDA_NEG = _core.template.expression(`%%check%% != null`);
+function transformOptionalChain(path, {
+  pureGetters,
+  noDocumentAll
+}, replacementPath, ifNullish, wrapLast) {
+  const {
+    scope
+  } = path;
+  if (scope.path.isPattern() && needsMemoize(path)) {
+    replacementPath.replaceWith(_core.template.expression.ast`(() => ${replacementPath.node})()`);
+    return;
+  }
+  const optionals = [];
+  let optionalPath = path;
+  while (optionalPath.isOptionalMemberExpression() || optionalPath.isOptionalCallExpression()) {
+    const {
+      node
+    } = optionalPath;
+    if (node.optional) {
+      optionals.push(node);
+    }
+    if (optionalPath.isOptionalMemberExpression()) {
+      optionalPath.node.type = "MemberExpression";
+      optionalPath = (0, _helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers)(optionalPath.get("object"));
+    } else if (optionalPath.isOptionalCallExpression()) {
+      optionalPath.node.type = "CallExpression";
+      optionalPath = (0, _helperSkipTransparentExpressionWrappers.skipTransparentExprWrappers)(optionalPath.get("callee"));
+    }
+  }
+  if (optionals.length === 0) {
+    return;
+  }
+  const checks = [];
+  let tmpVar;
+  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 = (0, _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 if (scope.isStatic(chain)) {
+      check = ref = chainWithTypes;
+    } else {
+      if (!tmpVar || isCall) {
+        tmpVar = scope.generateUidIdentifierBasedOnNode(chain);
+        scope.push({
+          id: _core.types.cloneNode(tmpVar)
+        });
+      }
+      ref = tmpVar;
+      check = _core.types.assignmentExpression("=", _core.types.cloneNode(tmpVar), chainWithTypes);
+      isCall ? node.callee = ref : node.object = ref;
+    }
+    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"));
+      }
+    }
+    const data = {
+      check: _core.types.cloneNode(check),
+      ref: _core.types.cloneNode(ref)
+    };
+    Object.defineProperty(data, "ref", {
+      enumerable: false
+    });
+    checks.push(data);
+  }
+  let result = replacementPath.node;
+  if (wrapLast) result = wrapLast(result);
+  const ifNullishBoolean = _core.types.isBooleanLiteral(ifNullish);
+  const ifNullishFalse = ifNullishBoolean && ifNullish.value === false;
+  const tpl = ifNullishFalse ? noDocumentAll ? NULLISH_CHECK_NO_DDA_NEG : NULLISH_CHECK_NEG : noDocumentAll ? NULLISH_CHECK_NO_DDA : NULLISH_CHECK;
+  const logicalOp = ifNullishFalse ? "&&" : "||";
+  const check = checks.map(tpl).reduce((expr, check) => _core.types.logicalExpression(logicalOp, expr, check));
+  replacementPath.replaceWith(ifNullishBoolean ? _core.types.logicalExpression(logicalOp, check, result) : _core.types.conditionalExpression(check, ifNullish, result));
+}
+function transform(path, assumptions) {
+  const {
+    scope
+  } = path;
+  const maybeWrapped = (0, _util.findOutermostTransparentParent)(path);
+  const {
+    parentPath
+  } = maybeWrapped;
+  if (parentPath.isUnaryExpression({
+    operator: "delete"
+  })) {
+    transformOptionalChain(path, assumptions, parentPath, _core.types.booleanLiteral(true));
+  } else {
+    let wrapLast;
+    if (parentPath.isCallExpression({
+      callee: maybeWrapped.node
+    }) && path.isOptionalMemberExpression()) {
+      wrapLast = replacement => {
+        var _baseRef;
+        const object = (0, _helperSkipTransparentExpressionWrappers.skipTransparentExprWrapperNodes)(replacement.object);
+        let baseRef;
+        if (!assumptions.pureGetters || !isSimpleMemberExpression(object)) {
+          baseRef = scope.maybeGenerateMemoised(object);
+          if (baseRef) {
+            replacement.object = _core.types.assignmentExpression("=", baseRef, object);
+          }
+        }
+        return _core.types.callExpression(_core.types.memberExpression(replacement, _core.types.identifier("bind")), [_core.types.cloneNode((_baseRef = baseRef) != null ? _baseRef : object)]);
+      };
+    }
+    transformOptionalChain(path, assumptions, path, (0, _util.willPathCastToBoolean)(maybeWrapped) ? _core.types.booleanLiteral(false) : scope.buildUndefinedNode(), wrapLast);
+  }
+}
+
+//# sourceMappingURL=transform.js.map