Copy Flow parser foundation for TypeScript parser

Summary:
This is a direct copy of the following files from the flow parser:

```
react-native-codegen/src/parsers/flow/errors.js
react-native-codegen/src/parsers/flow/utils.js
```

Changelog:
[Internal][Added] - Copy flow parser foundation files to aid in diff review

Reviewed By: RSNara

Differential Revision: D33137685

fbshipit-source-id: 1345c8bb0785c90b2bd64d4e6e2447f3fdb0ae6b

packages/react-native-codegen/src/parsers/typescript/errors.js

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+class ParserError extends Error {
+  nodes: $ReadOnlyArray<$FlowFixMe>;
+  constructor(
+    hasteModuleName: string,
+    astNodeOrNodes: $FlowFixMe,
+    message: string,
+  ) {
+    super(`Module ${hasteModuleName}: ${message}`);
+
+    this.nodes = Array.isArray(astNodeOrNodes)
+      ? astNodeOrNodes
+      : [astNodeOrNodes];
+
+    // assign the error class name in your custom error (as a shortcut)
+    this.name = this.constructor.name;
+
+    // capturing the stack trace keeps the reference to your error class
+    Error.captureStackTrace(this, this.constructor);
+  }
+}
+
+module.exports = {
+  ParserError,
+};

packages/react-native-codegen/src/parsers/typescript/utils.js

@@ -0,0 +1,210 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+const {ParserError} = require('./errors');
+
+/**
+ * This FlowFixMe is supposed to refer to an InterfaceDeclaration or TypeAlias
+ * declaration type. Unfortunately, we don't have those types, because flow-parser
+ * generates them, and flow-parser is not type-safe. In the future, we should find
+ * a way to get these types from our flow parser library.
+ *
+ * TODO(T71778680): Flow type AST Nodes
+ */
+export type TypeDeclarationMap = {[declarationName: string]: $FlowFixMe};
+
+function getTypes(ast: $FlowFixMe): TypeDeclarationMap {
+  return ast.body.reduce((types, node) => {
+    if (node.type === 'ExportNamedDeclaration' && node.exportKind === 'type') {
+      if (
+        node.declaration.type === 'TypeAlias' ||
+        node.declaration.type === 'InterfaceDeclaration'
+      ) {
+        types[node.declaration.id.name] = node.declaration;
+      }
+    } else if (
+      node.type === 'TypeAlias' ||
+      node.type === 'InterfaceDeclaration'
+    ) {
+      types[node.id.name] = node;
+    }
+    return types;
+  }, {});
+}
+
+// $FlowFixMe[unclear-type] there's no flowtype for ASTs
+export type ASTNode = Object;
+
+const invariant = require('invariant');
+
+type TypeAliasResolutionStatus =
+  | $ReadOnly<{
+      successful: true,
+      aliasName: string,
+    }>
+  | $ReadOnly<{
+      successful: false,
+    }>;
+
+function resolveTypeAnnotation(
+  // TODO(T71778680): This is an Flow TypeAnnotation. Flow-type this
+  typeAnnotation: $FlowFixMe,
+  types: TypeDeclarationMap,
+): {
+  nullable: boolean,
+  typeAnnotation: $FlowFixMe,
+  typeAliasResolutionStatus: TypeAliasResolutionStatus,
+} {
+  invariant(
+    typeAnnotation != null,
+    'resolveTypeAnnotation(): typeAnnotation cannot be null',
+  );
+
+  let node = typeAnnotation;
+  let nullable = false;
+  let typeAliasResolutionStatus: TypeAliasResolutionStatus = {
+    successful: false,
+  };
+
+  for (;;) {
+    if (node.type === 'NullableTypeAnnotation') {
+      nullable = true;
+      node = node.typeAnnotation;
+    } else if (node.type === 'GenericTypeAnnotation') {
+      typeAliasResolutionStatus = {
+        successful: true,
+        aliasName: node.id.name,
+      };
+      const resolvedTypeAnnotation = types[node.id.name];
+      if (resolvedTypeAnnotation == null) {
+        break;
+      }
+
+      invariant(
+        resolvedTypeAnnotation.type === 'TypeAlias',
+        `GenericTypeAnnotation '${node.id.name}' must resolve to a TypeAlias. Instead, it resolved to a '${resolvedTypeAnnotation.type}'`,
+      );
+
+      node = resolvedTypeAnnotation.right;
+    } else {
+      break;
+    }
+  }
+
+  return {
+    nullable: nullable,
+    typeAnnotation: node,
+    typeAliasResolutionStatus,
+  };
+}
+
+function getValueFromTypes(value: ASTNode, types: TypeDeclarationMap): ASTNode {
+  if (value.type === 'GenericTypeAnnotation' && types[value.id.name]) {
+    return getValueFromTypes(types[value.id.name].right, types);
+  }
+  return value;
+}
+
+export type ParserErrorCapturer = <T>(fn: () => T) => ?T;
+
+function createParserErrorCapturer(): [
+  Array<ParserError>,
+  ParserErrorCapturer,
+] {
+  const errors = [];
+  function guard<T>(fn: () => T): ?T {
+    try {
+      return fn();
+    } catch (error) {
+      if (!(error instanceof ParserError)) {
+        throw error;
+      }
+      errors.push(error);
+
+      return null;
+    }
+  }
+
+  return [errors, guard];
+}
+
+// TODO(T71778680): Flow-type ASTNodes.
+function visit(
+  astNode: $FlowFixMe,
+  visitor: {
+    [type: string]: (node: $FlowFixMe) => void,
+  },
+) {
+  const queue = [astNode];
+  while (queue.length !== 0) {
+    let item = queue.shift();
+
+    if (!(typeof item === 'object' && item != null)) {
+      continue;
+    }
+
+    if (
+      typeof item.type === 'string' &&
+      typeof visitor[item.type] === 'function'
+    ) {
+      // Don't visit any children
+      visitor[item.type](item);
+    } else if (Array.isArray(item)) {
+      queue.push(...item);
+    } else {
+      queue.push(...Object.values(item));
+    }
+  }
+}
+
+// TODO(T71778680): Flow-type ASTNodes.
+function isModuleRegistryCall(node: $FlowFixMe): boolean {
+  if (node.type !== 'CallExpression') {
+    return false;
+  }
+
+  const callExpression = node;
+
+  if (callExpression.callee.type !== 'MemberExpression') {
+    return false;
+  }
+
+  const memberExpression = callExpression.callee;
+  if (
+    !(
+      memberExpression.object.type === 'Identifier' &&
+      memberExpression.object.name === 'TurboModuleRegistry'
+    )
+  ) {
+    return false;
+  }
+
+  if (
+    !(
+      memberExpression.property.type === 'Identifier' &&
+      (memberExpression.property.name === 'get' ||
+        memberExpression.property.name === 'getEnforcing')
+    )
+  ) {
+    return false;
+  }
+  return true;
+}
+
+module.exports = {
+  getValueFromTypes,
+  resolveTypeAnnotation,
+  createParserErrorCapturer,
+  getTypes,
+  visit,
+  isModuleRegistryCall,
+};