I’ve been exploring the Apollo stack for developing with GraphQL and find the documentation a bit outdated so I decided to make some notes for myself and start collecting them here. The first thing I wanted to do is experiment with the apollo client codegen for TypeScript and understand how this tool works and leverage it for creating a TypeScript Apollo client. I started by using this Starwars sample Apollo server so I could focus on the client-side code gen which was quick and easy to stand up.
$ git clone https://github.com/apollographql/starwars-server.git
...
$ cd starwars-server
$ yarn && yarn start
yarn run v1.15.2
$ nodemon ./server.js --exec babel-node
[nodemon] 1.19.0
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `babel-node ./server.js`
🚀 Server ready at http://localhost:8080/graphql
🚀 Subscriptions ready at ws://localhost:8080/websocket
Next, I tested a simple GraphQL query to make sure the server is working by browsing here:
http://localhost:8080/graphql
I installed the Apollo CLI and started experimenting with codegen. Unfortunately, as of this writing the CLI documentation is outdated and refers to apollo-codegen and the parameters and configuration appear to have changed. To play with newer apollo CLI and client-side codegen I created a new “project” folder and just wanted to get some code generated without any other project dependencies/files etc. So, I created a folder to get started:
$ mkdir starwars-client
$ cd starwars-client
Next, I ran the apollo CLI to download the server’s schema with –endpoint parameter pointing to the running instance of the starwars-server sample:
$ ➜ starwars-client apollo client:download-schema --endpoint=http://localhost:8080/graphql
⚠️ It looks like there are 0 files associated with this Apollo Project. This may be because you don't have any files yet, or your includes/excludes fields are configured incorrectly, and Apollo can't find your files. For help configuring Apollo projects, see this guide: https://bit.ly/2ByILPj
✔ Loading Apollo Project
✔ Saving schema to schema.json
$ ls
schema.json
$
As you can see, this created a schema.json file containing details from my starwars-server. The next step is generating TypeScript code for a single GraphQL query using the downloaded schema. For good measure I’ll include a few of the issues I ran into along the way as I didn’t fine a lot on Google related to the various error messages.
➜ starwars-client apollo client:codegen
› Error: Missing required flag:
› --target TARGET Type of code generator to use (swift | typescript | flow | scala)
› See more help with --help
Ok, so I’m missing –target, that’s easy enough to add…
➜ starwars-client apollo client:codegen --target typescript
Error: No schema provider was created, because the project type was unable to be resolved from your config. Please add either a client or service config. For more information, please refer to https://bit.ly/2ByILPj
at Object.schemaProviderFromConfig (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/node_modules/apollo-language-server/lib/providers/schema/index.js:29:11)
at new GraphQLProject (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/node_modules/apollo-language-server/lib/project/base.js:31:40)
at new GraphQLClientProject (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/node_modules/apollo-language-server/lib/project/client.js:33:9)
at Generate.createService (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/lib/Command.js:114:28)
at Generate.init (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/lib/Command.js:37:14)
➜ starwars-client
Again, unfortunately the bitly short link provided by the tool points back to the outdated apollo-codegen documentation which is inaccurate. So I added –localSchemaFile pointing to my newly downloaded schema.json:
➜ starwars-client apollo client:codegen --localSchemaFile=schema.json --target=typescript
⚠️ It looks like there are 0 files associated with this Apollo Project. This may be because you don't have any files yet, or your includes/excludes fields are configured incorrectly, and Apollo can't find your files. For help configuring Apollo projects, see this guide: https://bit.ly/2ByILPj
✔ Loading Apollo Project
✖ Generating query files with 'typescript' target
→ No operations or fragments found to generate code for.
Error: No operations or fragments found to generate code for.
at write (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/lib/commands/client/codegen.js:61:39)
at Task.task (~/.nvm/versions/node/v10.15.3/lib/node_modules/apollo/lib/commands/client/codegen.js:86:46)
➜ starwars-client
What this error is actually saying is that the tool is expecting to find either .graphql or .ts files that have GraphQL “operations” aka queries, or mutations defined within my project folder which I haven’t created yet. Turns out there are a few options, 1) create .ts files with gql constants or 2) create a .graphql file(s) that contain named queries. I started with a simple query.graphql file for testing like this:
query {
heros(episode: NEWHOPE) {
name
}
}I then ran the command again:
➜ starwars-client apollo client:codegen --localSchemaFile=schema.json --target=typescript
…and this yielded the same error as above because the CLI defaults to looking in ./src although you can change this using the –includes parameter. So I created the folder, moved the query.graphql file and re-ran the tool:
➜ starwars-client apollo client:codegen --localSchemaFile=schema.json --target=typescript
✔ Loading Apollo Project
✖ Generating query files with 'typescript' target
→ Apollo does not support anonymous operations
GraphQLError: Apollo does not support anonymous operations
Basically, this is telling me didn’t “name” the query so back to editing the query.graphql file and adding “heros”:
query heros {
hero(episode: NEWHOPE) {
name
}
}Ok, now let’s try that again:
➜ starwars-client apollo client:codegen --localSchemaFile=schema.json --target=typescript
✔ Loading Apollo Project
✔ Generating query files with 'typescript' target - wrote 2 files
Success! I now have a few new folders and files added to my “project”:
➜ starwars-client tree
.
|____schema.json
|______generated__
| |____globalTypes.ts
|____src
| |____query.graphql
| |______generated__
| | |____heros.ts
Btw, here’s an example .ts file with a gql constant declared that would also work to generate code:
const heros = gql`
query heros {
hero(episode: NEWHOPE) {
name
}
}`;
In the above example I use command-line options although the apollo CLI supports a config file which looks like the following located in apollo.config.js which points to a remote schema from my starwars-server instance:
module.exports = {
client: {
service: {
url: "http://localhost:8080/graphql"
}
}
}
Using the config file you can change the command-line as follows for pulling the schema:
➜ starwars-client apollo client:download-schema --config=apollo.client.js
✔ Loading Apollo Project
✔ Saving schema to schema.json
Next, I’ll start making use of the generated code and save that for another post.
