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1 files changed, 183 insertions, 0 deletions

diff --git a/node_modules/@babel/traverse/lib/path/inference/inferer-reference.js b/node_modules/@babel/traverse/lib/path/inference/inferer-reference.js
new file mode 100644
index 00000000..32f6bce5
--- /dev/null
+++ b/node_modules/@babel/traverse/lib/path/inference/inferer-reference.js
@@ -0,0 +1,183 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = _default;
+
+function t() {
+  const data = _interopRequireWildcard(require("@babel/types"));
+
+  t = function t() {
+    return data;
+  };
+
+  return data;
+}
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
+
+function _default(node) {
+  if (!this.isReferenced()) return;
+  const binding = this.scope.getBinding(node.name);
+
+  if (binding) {
+    if (binding.identifier.typeAnnotation) {
+      return binding.identifier.typeAnnotation;
+    } else {
+      return getTypeAnnotationBindingConstantViolations(binding, this, node.name);
+    }
+  }
+
+  if (node.name === "undefined") {
+    return t().voidTypeAnnotation();
+  } else if (node.name === "NaN" || node.name === "Infinity") {
+    return t().numberTypeAnnotation();
+  } else if (node.name === "arguments") {}
+}
+
+function getTypeAnnotationBindingConstantViolations(binding, path, name) {
+  const types = [];
+  const functionConstantViolations = [];
+  let constantViolations = getConstantViolationsBefore(binding, path, functionConstantViolations);
+  const testType = getConditionalAnnotation(binding, path, name);
+
+  if (testType) {
+    const testConstantViolations = getConstantViolationsBefore(binding, testType.ifStatement);
+    constantViolations = constantViolations.filter(path => testConstantViolations.indexOf(path) < 0);
+    types.push(testType.typeAnnotation);
+  }
+
+  if (constantViolations.length) {
+    constantViolations = constantViolations.concat(functionConstantViolations);
+    var _arr = constantViolations;
+
+    for (var _i = 0; _i < _arr.length; _i++) {
+      const violation = _arr[_i];
+      types.push(violation.getTypeAnnotation());
+    }
+  }
+
+  if (types.length) {
+    return t().createUnionTypeAnnotation(types);
+  }
+}
+
+function getConstantViolationsBefore(binding, path, functions) {
+  const violations = binding.constantViolations.slice();
+  violations.unshift(binding.path);
+  return violations.filter(violation => {
+    violation = violation.resolve();
+
+    const status = violation._guessExecutionStatusRelativeTo(path);
+
+    if (functions && status === "function") functions.push(violation);
+    return status === "before";
+  });
+}
+
+function inferAnnotationFromBinaryExpression(name, path) {
+  const operator = path.node.operator;
+  const right = path.get("right").resolve();
+  const left = path.get("left").resolve();
+  let target;
+
+  if (left.isIdentifier({
+    name
+  })) {
+    target = right;
+  } else if (right.isIdentifier({
+    name
+  })) {
+    target = left;
+  }
+
+  if (target) {
+    if (operator === "===") {
+      return target.getTypeAnnotation();
+    }
+
+    if (t().BOOLEAN_NUMBER_BINARY_OPERATORS.indexOf(operator) >= 0) {
+      return t().numberTypeAnnotation();
+    }
+
+    return;
+  }
+
+  if (operator !== "===" && operator !== "==") return;
+  let typeofPath;
+  let typePath;
+
+  if (left.isUnaryExpression({
+    operator: "typeof"
+  })) {
+    typeofPath = left;
+    typePath = right;
+  } else if (right.isUnaryExpression({
+    operator: "typeof"
+  })) {
+    typeofPath = right;
+    typePath = left;
+  }
+
+  if (!typeofPath) return;
+  if (!typeofPath.get("argument").isIdentifier({
+    name
+  })) return;
+  typePath = typePath.resolve();
+  if (!typePath.isLiteral()) return;
+  const typeValue = typePath.node.value;
+  if (typeof typeValue !== "string") return;
+  return t().createTypeAnnotationBasedOnTypeof(typeValue);
+}
+
+function getParentConditionalPath(binding, path, name) {
+  let parentPath;
+
+  while (parentPath = path.parentPath) {
+    if (parentPath.isIfStatement() || parentPath.isConditionalExpression()) {
+      if (path.key === "test") {
+        return;
+      }
+
+      return parentPath;
+    }
+
+    if (parentPath.isFunction()) {
+      if (parentPath.parentPath.scope.getBinding(name) !== binding) return;
+    }
+
+    path = parentPath;
+  }
+}
+
+function getConditionalAnnotation(binding, path, name) {
+  const ifStatement = getParentConditionalPath(binding, path, name);
+  if (!ifStatement) return;
+  const test = ifStatement.get("test");
+  const paths = [test];
+  const types = [];
+
+  for (let i = 0; i < paths.length; i++) {
+    const path = paths[i];
+
+    if (path.isLogicalExpression()) {
+      if (path.node.operator === "&&") {
+        paths.push(path.get("left"));
+        paths.push(path.get("right"));
+      }
+    } else if (path.isBinaryExpression()) {
+      const type = inferAnnotationFromBinaryExpression(name, path);
+      if (type) types.push(type);
+    }
+  }
+
+  if (types.length) {
+    return {
+      typeAnnotation: t().createUnionTypeAnnotation(types),
+      ifStatement
+    };
+  }
+
+  return getConditionalAnnotation(ifStatement, name);
+}
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