Fix.

node_modules/istanbul-lib-instrument/dist/read-coverage.js

@@ -0,0 +1,80 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = readInitialCoverage;
+
+var _parser = require("@babel/parser");
+
+var _traverse = _interopRequireDefault(require("@babel/traverse"));
+
+var t = _interopRequireWildcard(require("@babel/types"));
+
+var _constants = require("./constants");
+
+var _instrumenter = require("./instrumenter");
+
+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 _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function readInitialCoverage(code) {
+  if (typeof code !== 'string') {
+    throw new Error('Code must be a string');
+  } // Parse as leniently as possible
+
+
+  const ast = (0, _parser.parse)(code, {
+    allowImportExportEverywhere: true,
+    allowReturnOutsideFunction: true,
+    allowSuperOutsideMethod: true,
+    sourceType: 'script',
+    plugins: (0, _instrumenter.defaultOpts)().plugins
+  });
+  let covScope;
+  (0, _traverse.default)(ast, {
+    ObjectProperty(path) {
+      const node = path.node;
+
+      if (!node.computed && t.isIdentifier(node.key) && node.key.name === _constants.MAGIC_KEY) {
+        const magicValue = path.get('value').evaluate();
+
+        if (!magicValue.confident || magicValue.value !== _constants.MAGIC_VALUE) {
+          return;
+        }
+
+        covScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
+        path.stop();
+      }
+    }
+
+  });
+
+  if (!covScope) {
+    return null;
+  }
+
+  const result = {};
+
+  for (var _i = 0, _arr = ['path', 'hash', 'gcv', 'coverageData']; _i < _arr.length; _i++) {
+    const key = _arr[_i];
+    const binding = covScope.getOwnBinding(key);
+
+    if (!binding) {
+      return null;
+    }
+
+    const valuePath = binding.path.get('init');
+    const value = valuePath.evaluate();
+
+    if (!value.confident) {
+      return null;
+    }
+
+    result[key] = value.value;
+  }
+
+  delete result.coverageData[_constants.MAGIC_KEY];
+  return result;
+}