Add node modules and compiled JavaScript from main

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

@@ -0,0 +1,87 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = readInitialCoverage;
+
+var _core = require("@babel/core");
+
+var _schema = require("@istanbuljs/schema");
+
+var _constants = require("./constants");
+
+function getAst(code) {
+  if (typeof code === 'object' && typeof code.type === 'string') {
+    // Assume code is already a babel ast.
+    return code;
+  }
+
+  if (typeof code !== 'string') {
+    throw new Error('Code must be a string');
+  } // Parse as leniently as possible
+
+
+  return (0, _core.parseSync)(code, {
+    babelrc: false,
+    configFile: false,
+    parserOpts: {
+      allowImportExportEverywhere: true,
+      allowReturnOutsideFunction: true,
+      allowSuperOutsideMethod: true,
+      sourceType: 'script',
+      plugins: _schema.defaults.instrumenter.parserPlugins
+    }
+  });
+}
+
+function readInitialCoverage(code) {
+  const ast = getAst(code);
+  let covScope;
+  (0, _core.traverse)(ast, {
+    ObjectProperty(path) {
+      const {
+        node
+      } = path;
+
+      if (!node.computed && path.get('key').isIdentifier() && 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 (const key of ['path', 'hash', 'gcv', 'coverageData']) {
+    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];
+  delete result.coverageData.hash;
+  return result;
+}