Add code to reproduce the issue [_ReferenceError: proto is not define…

…d #10_](protocolbuffers/protobuf-javascript#10)

README.md

@@ -0,0 +1,103 @@
+# protobuf-javascript: Try to reproduce "'proto' is not defined"
+
+## Overview
+
+This repository aims to reproduce the "'proto' is not defined" error as described in [_ReferenceError: proto is not defined #10_](https://github.com/protocolbuffers/protobuf-javascript/issues/10) to help the developers figure out whether there is a bug and, if there is, how to fix it.
+
+There two sub-directories:
+
+- `noejs` is a `node.js` native app that cannot reproduce the error.
+- `react-app` is a React.js app that can reproduce the error.
+
+I'll first mention the other existing work in the next section and then describe how to use these two apps.
+
+## Other work
+
+The issue [1] [_Failed to compile. 'proto' is not defined (also 'COMPILED') #447_](https://github.com/grpc/grpc-web/issues/447) in `grpc-web` mentions a similar problem that used TypeScript. The quick workaround was to disable `eslint` as mentioned [in this comment](https://github.com/grpc/grpc-web/issues/447#issuecomment-459122012). Others in the discussion also provided alternative workarounds. See [this](https://github.com/grpc/grpc-web/issues/447#issuecomment-460420957), [this](https://github.com/grpc/grpc-web/issues/447#issuecomment-491628171), [this](https://github.com/grpc/grpc-web/issues/447#issuecomment-564285432), [this](https://github.com/grpc/grpc-web/issues/447#issuecomment-568559394), and [this](https://github.com/grpc/grpc-web/issues/447#issuecomment-586668982).
+
+The issue also mentions the Pull Request [_Disable static checkers on generated js files #752_](https://github.com/grpc/grpc-web/pull/752). But note that this PR is for `grpc-web` so it only fixes the output of `--grpc-web_out` but not `--js_out`.
+
+But [1] gave me the hint to try to disable `eslint` in the React.js app and that did work around the issue.
+
+## How to use
+
+### Environment
+
+My environment:
+- Ubuntu 18.04 Desktop
+- `npm`: 6.14.15
+- `yarn`: 1.22.15
+- `node` (or `nodejs`): 14.18.2
+- `google-protobuf`: 3.19.4
+
+### `nodejs`
+
+`cd` into the sub-directory `nodejs` and run `run.sh`. This should print `good` at the end and doesn't report any error.
+
+### `react-app`
+
+There are two shell scripts:
+- `run-npm.sh`
+- `run-yarn.sh`
+
+Running `run-npm.sh` produced the following output (which suggests `eslint` might be the cause):
+
+```
+Failed to compile.
+
+[eslint] 
+src/foo_pb.js
+  Line 26:1:    'proto' is not defined     no-undef
+  Line 29:15:   'proto' is not defined     no-undef
+  Line 30:20:   'COMPILED' is not defined  no-undef
+  Line 31:3:    'proto' is not defined     no-undef
+  Line 46:1:    'proto' is not defined     no-undef
+  Line 47:10:   'proto' is not defined     no-undef
+  Line 60:1:    'proto' is not defined     no-undef
+  Line 78:1:    'proto' is not defined     no-undef
+  Line 80:17:   'proto' is not defined     no-undef
+  Line 81:10:   'proto' is not defined     no-undef
+  Line 92:1:    'proto' is not defined     no-undef
+  Line 116:1:   'proto' is not defined     no-undef
+  Line 118:3:   'proto' is not defined     no-undef
+  Line 130:1:   'proto' is not defined     no-undef
+  Line 146:1:   'proto' is not defined     no-undef
+  Line 152:1:   'proto' is not defined     no-undef
+  Line 157:29:  'proto' is not defined     no-undef
+
+Search for the keywords to learn more about each error.
+WARNING in [eslint] 
+src/App.js
+  Line 4:7:  'proj' is assigned a value but never used  no-unused-vars
+
+src/foo_pb.js
+  Line 12:14:  The Function constructor is eval     no-new-func
+  Line 61:7:   'f' is defined but never used        no-unused-vars
+  Line 80:13:  Missing '()' invoking a constructor  new-parens
+
+ERROR in [eslint] 
+src/foo_pb.js
+  Line 26:1:    'proto' is not defined     no-undef
+  Line 29:15:   'proto' is not defined     no-undef
+  Line 30:20:   'COMPILED' is not defined  no-undef
+  Line 31:3:    'proto' is not defined     no-undef
+  Line 46:1:    'proto' is not defined     no-undef
+  Line 47:10:   'proto' is not defined     no-undef
+  Line 60:1:    'proto' is not defined     no-undef
+  Line 78:1:    'proto' is not defined     no-undef
+  Line 80:17:   'proto' is not defined     no-undef
+  Line 81:10:   'proto' is not defined     no-undef
+  Line 92:1:    'proto' is not defined     no-undef
+  Line 116:1:   'proto' is not defined     no-undef
+  Line 118:3:   'proto' is not defined     no-undef
+  Line 130:1:   'proto' is not defined     no-undef
+  Line 146:1:   'proto' is not defined     no-undef
+  Line 152:1:   'proto' is not defined     no-undef
+  Line 157:29:  'proto' is not defined     no-undef
+
+Search for the keywords to learn more about each error.
+
+webpack compiled with 1 error and 1 warning
+```
+
+Running `run-yarn.sh` produced the same output as `run-npm.sh`.

nodejs/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# protobuf generated files
+*_pb.js

nodejs/package.json

@@ -0,0 +1,12 @@
+{
+    "name": "protobuf-js-issue",
+    "version": "0.1.0",
+    "private": true,
+    "dependencies": {
+        "google-protobuf": "^3.19.4"
+    },
+    "scripts": {
+        "start": "nodejs ./tests/test.js",
+        "proto": "protoc --proto_path=./protos/ --js_out=import_style=commonjs,binary:./protos/ protos/*.proto"
+    }
+}

nodejs/protos/bar.proto

@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+package example;
+
+message Bar {
+    /// Some variable.
+    string bar_name = 1;
+}

nodejs/protos/foo.proto

@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+package example;
+
+message Foo {
+    /// Some variable.
+    string foo_name = 1;
+}

nodejs/protos/proj.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package example;
+
+import "foo.proto";
+import "bar.proto";
+
+message project {
+    Foo foo = 1;
+    Bar bar = 2;
+}

nodejs/run.sh

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+#!/bin/sh
+
+npm install || exit
+
+npm run proto || exit
+
+npm run start || exit

nodejs/tests/test.js

@@ -0,0 +1,9 @@
+const foopb = require('../protos/foo_pb');
+const barpb = require('../protos/bar_pb');
+const projpb = require('../protos/proj_pb');
+
+console.log(foopb);
+console.log(barpb);
+console.log(projpb);
+
+console.log("good!");

nodejs/yarn.lock

@@ -0,0 +1,8 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+google-protobuf@^3.19.4:
+  version "3.21.2"
+  resolved "https://registry.yarnpkg.com/google-protobuf/-/google-protobuf-3.21.2.tgz#4580a2bea8bbb291ee579d1fefb14d6fa3070ea4"
+  integrity sha512-3MSOYFO5U9mPGikIYCzK0SaThypfGgS6bHqrUGXG3DPHCrb+txNqeEcns1W0lkGfk0rCyNXm7xB9rMxnCiZOoA==

react-app/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# protobuf generated files
+*_pb.js
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

react-app/README.md

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+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
+
+You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)