# Apollo CLI [![GitHub license](https://img.shields.io/badge/license-MIT-lightgrey.svg?maxAge=2592000)](https://raw.githubusercontent.com/apollographql/apollo-tooling/master/LICENSE) [![npm](https://img.shields.io/npm/v/apollo.svg)](https://www.npmjs.com/package/apollo) [![Get on Slack](https://img.shields.io/badge/spectrum-join-orange.svg)](https://spectrum.chat/apollo?tab=posts) --- > **[2022-01-21] Note - Upcoming Deprecation Plans:** We (Apollo) are working towards fully deprecating this repository and its related projects. Most of the functionality in this repository has been replaced by newer projects and the rest will be soon. We'll share detailed migration documentation when everything here is ready to be officially deprecated, but just a heads up in case you're planning on adopting anything here for a new project (which you still can of course if the tooling here works for you - support for this tooling will be minimal however). --- > **[2021-07-23] Note - Housekeeping:** Apollo's GraphQL VSCode extension is no longer housed in this repository. It is now maintained separately in [this repo](https://github.com/apollographql/vscode-graphql). --- Apollo CLI brings together your GraphQL clients and servers with tools for validating your schema, linting your operations for compatibility with your server, and generating static types for improved client-side type safety. * [Apollo CLI](#apollo-cli) * [Usage](#usage) * [Commands](#commands) * [Configuration](#configuration) * [Code Generation](#code-generation) * [Contributing](#contributing) # Usage **Disclaimer**: The following API documentation is only for the latest version released on NPM, and may not be accurate for previous or future versions. ```sh-session $ npm install -g apollo $ apollo COMMAND running command... $ apollo (-v|--version|version) apollo/2.34.0 linux-x64 node-v16.15.0 $ apollo --help [COMMAND] USAGE $ apollo COMMAND ... ``` # Commands * [`apollo client:check`](#apollo-clientcheck) * [`apollo client:codegen [OUTPUT]`](#apollo-clientcodegen-output) * [`apollo client:download-schema OUTPUT`](#apollo-clientdownload-schema-output) * [`apollo client:extract OUTPUT`](#apollo-clientextract-output) * [`apollo client:push`](#apollo-clientpush) * [`apollo help [COMMAND]`](#apollo-help-command) * [`apollo plugins`](#apollo-plugins) * [`apollo plugins:inspect PLUGIN...`](#apollo-pluginsinspect-plugin) * [`apollo plugins:install PLUGIN...`](#apollo-pluginsinstall-plugin) * [`apollo plugins:link PLUGIN`](#apollo-pluginslink-plugin) * [`apollo plugins:uninstall PLUGIN...`](#apollo-pluginsuninstall-plugin) * [`apollo plugins:update`](#apollo-pluginsupdate) * [`apollo service:check`](#apollo-servicecheck) * [`apollo service:delete`](#apollo-servicedelete) * [`apollo service:download OUTPUT`](#apollo-servicedownload-output) * [`apollo service:list`](#apollo-servicelist) * [`apollo service:push`](#apollo-servicepush) ## `apollo client:check` Check a client project against a pushed service ``` USAGE $ apollo client:check OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID for the graph in Apollo to operate client commands with. Overrides config file if set. -v, --variant=variant The variant of the graph in Apollo to associate this client to --clientName=clientName Name of the client that the queries will be attached to --clientReferenceId=clientReferenceId Reference id for the client which will match ids from client traces, will use clientName if not provided --clientVersion=clientVersion The version of the client that the queries will be attached to --endpoint=endpoint The URL for the CLI use to introspect your service --excludes=excludes Glob of files to exclude for GraphQL operations. Caveat: this doesn't currently work in watch mode --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --includes=includes Glob of files to search for GraphQL operations. This should be used to find queries *and* any client schema extensions --key=key The API key to use for authentication to Apollo --queries=queries Deprecated in favor of the includes flag --tagName=tagName Name of the template literal tag used to identify template literals containing GraphQL queries in Javascript/Typescript code ``` _See code: [src/commands/client/check.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/client/check.ts)_ ## `apollo client:codegen [OUTPUT]` [DEPRECATED] Generate static types for GraphQL queries. Can use the published schema in the Apollo registry or a downloaded schema. ``` USAGE $ apollo client:codegen [OUTPUT] ARGUMENTS OUTPUT Directory to which generated files will be written. - For TypeScript/Flow generators, this specifies a directory relative to each source file by default. - For TypeScript/Flow generators with the "outputFlat" flag is set, and for the Swift generator, this specifies a file or directory (absolute or relative to the current working directory) to which: - a file will be written for each query (if "output" is a directory) - all generated types will be written - For all other types, this defines a file (absolute or relative to the current working directory) to which all generated types are written. OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID for the graph in Apollo to operate client commands with. Overrides config file if set. -v, --variant=variant The variant of the graph in Apollo to associate this client to --[no-]addTypename [default: true] Automatically add __typename to your queries, can be unset with --no-addTypename --clientName=clientName Name of the client that the queries will be attached to --clientReferenceId=clientReferenceId Reference id for the client which will match ids from client traces, will use clientName if not provided --clientVersion=clientVersion The version of the client that the queries will be attached to --customScalarsPrefix=customScalarsPrefix Include a prefix when using provided types for custom scalars --endpoint=endpoint The URL for the CLI use to introspect your service --excludes=excludes Glob of files to exclude for GraphQL operations. Caveat: this doesn't currently work in watch mode --globalTypesFile=globalTypesFile By default, TypeScript will put a file named "globalTypes.ts" inside the "output" directory. Set "globalTypesFile" to specify a different path. Alternatively, set "tsFileExtension" to modify the extension of the file, for example "d.ts" will output "globalTypes.d.ts" --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --includes=includes Glob of files to search for GraphQL operations. This should be used to find queries *and* any client schema extensions --key=key The API key to use for authentication to Apollo --localSchemaFile=localSchemaFile Path to one or more local GraphQL schema file(s), as introspection result or SDL. Supports comma-separated list of paths (ex. `--localSchemaFile=schema.graphql,extensions.graphql`) --mergeInFieldsFromFragmentSpreads Merge fragment fields onto its enclosing type --namespace=namespace The namespace to emit generated code into. --omitDeprecatedEnumCases Omit deprecated enum cases from generated code [Swift only] --only=only Parse all input files, but only output generated code for the specified file [Swift only] --operationIdsPath=operationIdsPath Path to an operation id JSON map file. If specified, also stores the operation ids (hashes) as properties on operation types [currently Swift-only] --outputFlat By default, TypeScript/Flow will put each generated file in a directory next to its source file using the value of the "output" as the directory name. Set "outputFlat" to put all generated files in the directory relative to the current working directory defined by "output". --passthroughCustomScalars Use your own types for custom scalars --queries=queries Deprecated in favor of the includes flag --suppressDeprecationWarning Silence the deprecation warning output by the codegen command --suppressSwiftMultilineStringLiterals Prevents operations from being rendered as multiline strings [Swift only] --tagName=tagName Name of the template literal tag used to identify template literals containing GraphQL queries in Javascript/Typescript code --target=target (required) Type of code generator to use (swift | typescript | flow | scala | json | json-modern (exposes raw json types)) --tsFileExtension=tsFileExtension By default, TypeScript will output "ts" files. Set "tsFileExtension" to specify a different file extension, for example "d.ts" --useFlowExactObjects Use Flow exact objects for generated types [flow only] --useFlowReadOnlyTypes Use read only types for generated types [flow only]. **Deprecated in favor of `useReadOnlyTypes`.** --useReadOnlyTypes Use read only types for generated types [flow | typescript] --watch Watch for file changes and reload codegen ALIASES $ apollo codegen:generate ``` _See code: [src/commands/client/codegen.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/client/codegen.ts)_ ## `apollo client:download-schema OUTPUT` Download a schema from Apollo or a GraphQL endpoint in JSON or SDL format ``` USAGE $ apollo client:download-schema OUTPUT ARGUMENTS OUTPUT [default: schema.json] Path to write the introspection result to. Can be `.graphql`, `.gql`, `.graphqls`, or `.json` OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID for the graph in Apollo to operate client commands with. Overrides config file if set. -v, --variant=variant The variant of the graph in Apollo to associate this client to --clientName=clientName Name of the client that the queries will be attached to --clientReferenceId=clientReferenceId Reference id for the client which will match ids from client traces, will use clientName if not provided --clientVersion=clientVersion The version of the client that the queries will be attached to --endpoint=endpoint The URL for the CLI use to introspect your service --excludes=excludes Glob of files to exclude for GraphQL operations. Caveat: this doesn't currently work in watch mode --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --includes=includes Glob of files to search for GraphQL operations. This should be used to find queries *and* any client schema extensions --key=key The API key to use for authentication to Apollo --queries=queries Deprecated in favor of the includes flag --tagName=tagName Name of the template literal tag used to identify template literals containing GraphQL queries in Javascript/Typescript code ``` _See code: [src/commands/client/download-schema.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/client/download-schema.ts)_ ## `apollo client:extract OUTPUT` Extract queries from a client ``` USAGE $ apollo client:extract OUTPUT ARGUMENTS OUTPUT [default: manifest.json] Path to write the extracted queries to OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID for the graph in Apollo to operate client commands with. Overrides config file if set. -v, --variant=variant The variant of the graph in Apollo to associate this client to --clientName=clientName Name of the client that the queries will be attached to --clientReferenceId=clientReferenceId Reference id for the client which will match ids from client traces, will use clientName if not provided --clientVersion=clientVersion The version of the client that the queries will be attached to --endpoint=endpoint The URL for the CLI use to introspect your service --excludes=excludes Glob of files to exclude for GraphQL operations. Caveat: this doesn't currently work in watch mode --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --includes=includes Glob of files to search for GraphQL operations. This should be used to find queries *and* any client schema extensions --key=key The API key to use for authentication to Apollo --preserveStringAndNumericLiterals Disable redaction of string and numerical literals. Without this flag, these values will be replaced with empty strings (`''`) and zeroes (`0`) respectively. This redaction is intended to avoid inadvertently outputting potentially personally identifiable information (e.g. embedded passwords or API keys) into operation manifests --queries=queries Deprecated in favor of the includes flag --tagName=tagName Name of the template literal tag used to identify template literals containing GraphQL queries in Javascript/Typescript code ``` _See code: [src/commands/client/extract.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/client/extract.ts)_ ## `apollo client:push` Register operations with Apollo, adding them to the safelist ``` USAGE $ apollo client:push OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID for the graph in Apollo to operate client commands with. Overrides config file if set. -v, --variant=variant The variant of the graph in Apollo to associate this client to --clientName=clientName Name of the client that the queries will be attached to --clientReferenceId=clientReferenceId Reference id for the client which will match ids from client traces, will use clientName if not provided --clientVersion=clientVersion The version of the client that the queries will be attached to --endpoint=endpoint The URL for the CLI use to introspect your service --excludes=excludes Glob of files to exclude for GraphQL operations. Caveat: this doesn't currently work in watch mode --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --includes=includes Glob of files to search for GraphQL operations. This should be used to find queries *and* any client schema extensions --key=key The API key to use for authentication to Apollo --queries=queries Deprecated in favor of the includes flag --tagName=tagName Name of the template literal tag used to identify template literals containing GraphQL queries in Javascript/Typescript code ``` _See code: [src/commands/client/push.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/client/push.ts)_ ## `apollo help [COMMAND]` display help for apollo ``` USAGE $ apollo help [COMMAND] ARGUMENTS COMMAND command to show help for OPTIONS --all see all commands in CLI ``` _See code: [@oclif/plugin-help](https://github.com/oclif/plugin-help/blob/v3.2.18/src/commands/help.ts)_ ## `apollo plugins` List installed plugins. ``` USAGE $ apollo plugins OPTIONS --core Show core plugins. EXAMPLE $ apollo plugins ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/index.ts)_ ## `apollo plugins:inspect PLUGIN...` Displays installation properties of a plugin. ``` USAGE $ apollo plugins:inspect PLUGIN... ARGUMENTS PLUGIN [default: .] Plugin to inspect. OPTIONS -h, --help Show CLI help. -v, --verbose EXAMPLE $ apollo plugins:inspect myplugin ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/inspect.ts)_ ## `apollo plugins:install PLUGIN...` Installs a plugin into the CLI. ``` USAGE $ apollo plugins:install PLUGIN... ARGUMENTS PLUGIN Plugin to install. OPTIONS -f, --force Run yarn install with force flag. -h, --help Show CLI help. -v, --verbose DESCRIPTION Can be installed from npm or a git url. Installation of a user-installed plugin will override a core plugin. e.g. If you have a core plugin that has a 'hello' command, installing a user-installed plugin with a 'hello' command will override the core plugin implementation. This is useful if a user needs to update core plugin functionality in the CLI without the need to patch and update the whole CLI. ALIASES $ apollo plugins:add EXAMPLES $ apollo plugins:install myplugin $ apollo plugins:install https://github.com/someuser/someplugin $ apollo plugins:install someuser/someplugin ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/install.ts)_ ## `apollo plugins:link PLUGIN` Links a plugin into the CLI for development. ``` USAGE $ apollo plugins:link PLUGIN ARGUMENTS PATH [default: .] path to plugin OPTIONS -h, --help Show CLI help. -v, --verbose DESCRIPTION Installation of a linked plugin will override a user-installed or core plugin. e.g. If you have a user-installed or core plugin that has a 'hello' command, installing a linked plugin with a 'hello' command will override the user-installed or core plugin implementation. This is useful for development work. EXAMPLE $ apollo plugins:link myplugin ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/link.ts)_ ## `apollo plugins:uninstall PLUGIN...` Removes a plugin from the CLI. ``` USAGE $ apollo plugins:uninstall PLUGIN... ARGUMENTS PLUGIN plugin to uninstall OPTIONS -h, --help Show CLI help. -v, --verbose ALIASES $ apollo plugins:unlink $ apollo plugins:remove ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/uninstall.ts)_ ## `apollo plugins:update` Update installed plugins. ``` USAGE $ apollo plugins:update OPTIONS -h, --help Show CLI help. -v, --verbose ``` _See code: [@oclif/plugin-plugins](https://github.com/oclif/plugin-plugins/blob/v2.1.0/src/commands/plugins/update.ts)_ ## `apollo service:check` [DEPRECATED] Check a service against known operation workloads to find breaking changes ``` USAGE $ apollo service:check OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID of the graph in Apollo to check your proposed schema changes against. Overrides config file if set. -v, --variant=variant The variant to check the proposed schema against --author=author The author to associate with this proposed schema --branch=branch The branch name to associate with this check --commitId=commitId The SHA-1 hash of the commit to associate with this check --endpoint=endpoint The URL for the CLI use to introspect your service --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --ignoreFailures Exit with status 0 when the check completes, even if errors are found --json Output result in json, which can then be parsed by CLI tools such as jq. --key=key The API key to use for authentication to Apollo --localSchemaFile=localSchemaFile Path to one or more local GraphQL schema file(s), as introspection result or SDL. Supports comma-separated list of paths (ex. `--localSchemaFile=schema.graphql,extensions.graphql`) --markdown Output result in markdown. --queryCountThreshold=queryCountThreshold Minimum number of requests within the requested time window for a query to be considered. --queryCountThresholdPercentage=queryCountThresholdPercentage Number of requests within the requested time window for a query to be considered, relative to total request count. Expected values are between 0 and 0.05 (minimum 5% of total request volume) --serviceName=serviceName Provides the name of the implementing service for a federated graph. This flag will indicate that the schema is a partial schema from a federated service --validationPeriod=validationPeriod The size of the time window with which to validate the schema against. You may provide a number (in seconds), or an ISO8601 format duration for more granularity (see: https://en.wikipedia.org/wiki/ISO_8601#Durations) DESCRIPTION ----------------------------------------------------------------- DEPRECATED: This command will be removed from the `apollo` CLI in its next major version. Replacement functionality is available in the new Apollo Rover CLI: https://go.apollo.dev/t/migration ----------------------------------------------------------------- ALIASES $ apollo schema:check ``` _See code: [src/commands/service/check.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/service/check.ts)_ ## `apollo service:delete` [DEPRECATED] Delete a federated service from Apollo and recompose remaining services ``` USAGE $ apollo service:delete OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID of the graph in Apollo for which to delete an implementing service. Overrides config file if set. -v, --variant=variant The variant to delete the implementing service from -y, --yes Bypass confirmation when deleting a service --endpoint=endpoint The URL for the CLI use to introspect your service --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --key=key The API key to use for authentication to Apollo --serviceName=serviceName (required) Provides the name of the implementing service for a federated graph DESCRIPTION ----------------------------------------------------------------- DEPRECATED: This command will be removed from the `apollo` CLI in its next major version. Replacement functionality is available in the new Apollo Rover CLI: https://go.apollo.dev/t/migration ----------------------------------------------------------------- ``` _See code: [src/commands/service/delete.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/service/delete.ts)_ ## `apollo service:download OUTPUT` [DEPRECATED] Download the schema from your GraphQL endpoint. ``` USAGE $ apollo service:download OUTPUT ARGUMENTS OUTPUT [default: schema.json] Path to write the introspection result to. Supports .json output only. OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID of the graph in the Apollo registry for which to download the schema for. Overrides config file if provided. -k, --skipSSLValidation Allow connections to an SSL site without certs -v, --variant=variant The variant to download the schema of --endpoint=endpoint The URL for the CLI use to introspect your service --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --key=key The API key to use for authentication to Apollo DESCRIPTION ----------------------------------------------------------------- DEPRECATED: This command will be removed from the `apollo` CLI in its next major version. Replacement functionality is available in the new Apollo Rover CLI: https://go.apollo.dev/t/migration ----------------------------------------------------------------- ALIASES $ apollo schema:download ``` _See code: [src/commands/service/download.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/service/download.ts)_ ## `apollo service:list` [DEPRECATED] List the services in a graph ``` USAGE $ apollo service:list OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID of the graph in the Apollo registry for which to list implementing services. Overrides config file if set. -v, --variant=variant The variant to list implementing services for --endpoint=endpoint The URL for the CLI use to introspect your service --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --key=key The API key to use for authentication to Apollo DESCRIPTION ----------------------------------------------------------------- DEPRECATED: This command will be removed from the `apollo` CLI in its next major version. Replacement functionality is available in the new Apollo Rover CLI: https://go.apollo.dev/t/migration ----------------------------------------------------------------- ``` _See code: [src/commands/service/list.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/service/list.ts)_ ## `apollo service:push` [DEPRECATED] Push a service definition to Apollo ``` USAGE $ apollo service:push OPTIONS -c, --config=config Path to your Apollo config file -g, --graph=graph The ID of the graph in Apollo to publish your service to. Overrides config file if set. -v, --variant=variant The variant to publish your service to in Apollo --author=author The author to associate with this publication --branch=branch The branch name to associate with this publication --commitId=commitId The SHA-1 hash of the commit to associate with this publication --endpoint=endpoint The URL for the CLI use to introspect your service --header=header Additional header to send during introspection. May be used multiple times to add multiple headers. NOTE: The `--endpoint` flag is REQUIRED if using the `--header` flag. --key=key The API key to use for authentication to Apollo --localSchemaFile=localSchemaFile Path to one or more local GraphQL schema file(s), as introspection result or SDL. Supports comma-separated list of paths (ex. `--localSchemaFile=schema.graphql,extensions.graphql`) --serviceName=serviceName Provides the name of the implementing service for a federated graph --serviceRevision=serviceRevision Provides a unique revision identifier for a change to an implementing service on a federated service push. The default of this is a git sha --serviceURL=serviceURL Provides the url to the location of the implementing service for a federated graph DESCRIPTION ----------------------------------------------------------------- DEPRECATED: This command will be removed from the `apollo` CLI in its next major version. Replacement functionality is available in the new Apollo Rover CLI: https://go.apollo.dev/t/migration ----------------------------------------------------------------- ALIASES $ apollo schema:publish ``` _See code: [src/commands/service/push.ts](https://github.com/apollographql/apollo-tooling/blob/master/packages/apollo/src/commands/service/push.ts)_ # Configuration The Apollo CLI and VS Code extension can be configured with an Apollo config file. Apollo configuration is stored as a plain object in an `apollo.config.js` file which exports the configuration. For more information about configuring an Apollo project, see: https://www.apollographql.com/docs/devtools/apollo-config/. > Note: the use of the `apollo` key in the project's package.json file for configuration is deprecated, and will no longer be supported in Apollo v3 You'll need to set up your Apollo configuration for all the features of the Apollo CLI and VS Code extension to work correctly. For full details on how to do that, [visit our docs](https://www.apollographql.com/docs/devtools/apollo-config/). A basic configuration (`apollo.config.js` style) looks something like this: ```js module.exports = { client: { name: "My Client Project", service: "my-service-name" } }; ``` # Code Generation ## Accompanying Libraries See [Apollo iOS](https://github.com/apollographql/apollo-ios) for details on the mapping from GraphQL results to Swift types, as well as runtime support for executing queries and mutations. For Scala, see [React Apollo Scala.js](https://github.com/apollographql/react-apollo-scalajs) for details on how to use generated Scala code in a Scala.js app with Apollo Client. ## `gql` template support If the source file for generation is a JavaScript or TypeScript file, the codegen will try to extrapolate the queries inside the [gql tag](https://github.com/apollographql/graphql-tag) templates. The tag name is configurable using the CLI `--tagName` option. ## Typescript and Flow When using the codegen command with Typescript or Flow, make sure to add the `__typename` introspection field to every selection set within your graphql operations. If you're using a client like `apollo-client` that does this automatically for your GraphQL operations, pass in the `--addTypename` option to `apollo codegen:generate` to make sure the generated Typescript and Flow types have the `__typename` field as well. This is required to ensure proper type generation support for `GraphQLUnionType` and `GraphQLInterfaceType` fields. ## Why is the \_\_typename field required? Using the type information from the GraphQL schema, we can infer the possible types for fields. However, in the case of a `GraphQLUnionType` or `GraphQLInterfaceType`, there are multiple types that are possible for that field. This is best modeled using a disjoint union with the `__typename` as the discriminant. For example, given a schema: ```graphql ... interface Character { name: String! } type Human implements Character { homePlanet: String } type Droid implements Character { primaryFunction: String } ... ``` Whenever a field of type `Character` is encountered, it could be either a Human or Droid. Human and Droid objects will have a different set of fields. Within your application code, when interacting with a `Character` you'll want to make sure to handle both of these cases. Given this query: ```graphql query Characters { characters(episode: NEW_HOPE) { name ... on Human { homePlanet } ... on Droid { primaryFunction } } } ``` Apollo Codegen will generate a union type for Character. ```javascript export type CharactersQuery = { characters: Array< | { __typename: "Human", name: string, homePlanet: ?string } | { __typename: "Droid", name: string, primaryFunction: ?string } > }; ``` This type can then be used as follows to ensure that all possible types are handled: ```javascript function CharacterFigures({ characters }: CharactersQuery) { return characters.map(character => { switch (character.__typename) { case "Human": return ( ); case "Droid": return ( ); } }); } ``` # Contributing [![Build Status](https://circleci.com/gh/apollographql/apollo-tooling.svg?style=svg)](https://circleci.com/gh/apollographql/apollo-tooling) This repo is composed of multiple packages. The `apollo-cli` contains the core CLI commands. The `apollo-codegen-core` package contains all the compiler APIs needed to implement code generation support for new languages. The other `apollo-codegen-*` packages implement code generation support for individual languages. Running tests locally: ``` npm install npm test ``` You can also run `npm` commands within package folders after you have bootstrapped the repository (part of `npm install`). > Note: if you have issues, try `npm run clean && npm i` to get a fresh install of the packages. Occasionally problems arise when removed dependencies stay around ## Nock tests To display the debugging messages for nock, run the following command: ```bash DEBUG=nock.* npm test ``` It can also be helpful to print standard out during testing. To enable logging, add the following configuration to the `stdout` function call during test creation: ``` .stdout({ print: true }) ``` ## Active Development / Debugging To simplify the development process, you may want to step through and debug commands whose behavior you're modifying. To do this, run the executable with node in debug mode like so, where `` is a valid CLI command like `client:check` or `service:push`: ``` node --inspect-brk=9002 packages/apollo/bin/run ``` If you're using VS Code, you can run the included "Attach to CLI Debugger" launch task and debug right from VS Code! Otherwise, you may use the Chrome inspector or [other Node debugger](https://nodejs.org/en/docs/guides/debugging-getting-started/) of your choice. ## Regenerating Mocked Network Data Some integration tests rely on mocked server data (service:check for example). Mock data is generated by making real network requests and recording those requests with [`nock`'s recording feature](https://github.com/nock/nock#recording). Stop mocking network calls and add `nock.recorder.rec()` before network calls are made. For `service:check`, change `apiKey` to a real Apollo API key. Then run the tests and nock will output code to mock requests to the console. You can (and probably should) pare down the request to be less brittle (by only checking for an operation name, for example). See [`src/commands/service/__tests__/check.test.ts`](./packages/apollo/src/commands/service/__tests__/check.test.ts) for an example of how a mocked network request will look. ## Publishing 1. Make sure the `CHANGELOG.md` is updated with all changes committed since the last release. Make sure the versions for each package to update are correct. 2. Run `npm run release:version-bump -- ` - Can use major, minor, patch, prepatch, etc for the bump type. If not used, the command will prompt and ask for the bump type. - This command updates git tags locally and on GitHub 3. Run npm run release:start-ci-publish locally - IMPORTANT: If publishing a prerelease (like `alpha`/`beta`/`rc`), set the tag that NPM will use to publish with the `APOLLO_DIST_TAG` environment variable. By default, if this isn't set, NPM will publish the prerelease to the `latest` tag (which isn't what we'd want). - Pushes a `publish/XXXXXXXXXX` tag to GitHub to trigger circle CI build 4. Circle will notify the appropriate Apollo team slack channel when ready to release - Slack channel member will confirm through the Apollo Deploy Bot - Circle will release to all channels (npm, cli binary to s3, vscode marketplace) - Another slack bot notification will confirm success of release. ## Maintainers - [@JakeDawkins](https://github.com/jakedawkins) (Apollo)

			Stars	Issues	Version	Updated	Created	Size
	@angular/core		95,727	1,610	18.2.5	3 days ago	8 years ago
	apollo		3,041	384	2.34.0	2 years ago	12 years ago

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