How to use @graphql-codegen/cli - 5 common examples

"typescript",
                        "typescript-operations",
                    ],
                    config: {
                        namingConvention: "keep",
                        avoidOptionals: false,
                    },
                },
            },
        };

        const graphqlFiles = await util.promisify(glob)(graphQlGlob);

        if (graphqlFiles && graphqlFiles.length > 0) {
            config.documents = [graphQlGlob];
            await generate(config);
            const typesContent = await fs.readFile(gqlGenOutput, "utf8");
            await fs.writeFile(gqlGenOutput, `/* tslint:disable */\n\n${typesContent}`, "utf8");
        } else {
            console.info("No GraphQL files found in project, skipping type generation.");
        }
        process.exit(0);

    } catch (e) {
        console.error(`Generating GraphQL types failed: ${e.message}`);
        process.exit(1);
    }
    throw new Error("Should never get here, process.exit() called above");
}

async init({ program, loadGraphQLConfig, reportError }) {
    const commandInstance = program.command('codegen');
    // Let codegen manage our command instance with its own options
    setCommandOptions(commandInstance)
      .action(async cliFlags => {
        try {
          // Load root GraphQL Config not Project Config because Codegen will update it by looking at `project` param
          const graphqlConfig = await loadGraphQLConfig({
            extensions: [CodegenExtension]
          });
          // Create Codegen Context with our loaded GraphQL Config
          const codegenContext = new CodegenContext({
            graphqlConfig,
          });
          // This will update Codegen Context with the options provided in CLI arguments
          updateContextWithCliFlags(codegenContext, cliFlags);
          await generate(codegenContext);
        } catch (e) {
          reportError(e);
        }

.action(async cliFlags => {
        try {
          // Load root GraphQL Config not Project Config because Codegen will update it by looking at `project` param
          const graphqlConfig = await loadGraphQLConfig({
            extensions: [CodegenExtension]
          });
          // Create Codegen Context with our loaded GraphQL Config
          const codegenContext = new CodegenContext({
            graphqlConfig,
          });
          // This will update Codegen Context with the options provided in CLI arguments
          updateContextWithCliFlags(codegenContext, cliFlags);
          await generate(codegenContext);
        } catch (e) {
          reportError(e);
        }
      });
  }

.action(async cliFlags => {
        try {
          // Load root GraphQL Config not Project Config because Codegen will update it by looking at `project` param
          const graphqlConfig = await loadGraphQLConfig({
            extensions: [CodegenExtension]
          });
          // Create Codegen Context with our loaded GraphQL Config
          const codegenContext = new CodegenContext({
            graphqlConfig,
          });
          // This will update Codegen Context with the options provided in CLI arguments
          updateContextWithCliFlags(codegenContext, cliFlags);
          await generate(codegenContext);
        } catch (e) {
          reportError(e);
        }
      });
  }

.action(async cliFlags => {
        try {
          // Load root GraphQL Config not Project Config because Codegen will update it by looking at `project` param
          const graphqlConfig = await loadGraphQLConfig({
            extensions: [CodegenExtension]
          });
          // Create Codegen Context with our loaded GraphQL Config
          const codegenContext = new CodegenContext({
            graphqlConfig,
          });
          // This will update Codegen Context with the options provided in CLI arguments
          updateContextWithCliFlags(codegenContext, cliFlags);
          await generate(codegenContext);
        } catch (e) {
          reportError(e);
        }
      });
  }