feat: generate git ignore (#1629)

Author: saihaj

.changeset/happy-cats-fail.md

@@ -0,0 +1,5 @@
+---
+'@graphprotocol/graph-cli': minor
+---
+
+generate gitignore file

packages/cli/src/scaffold/get-git-ignore.ts

@@ -0,0 +1,37 @@
+export const getGitIgnore = () => {
+  return `# Graph CLI generated artifacts
+build/
+generated/
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# dotenv environment variables file
+.env
+
+# Testing
+coverage
+coverage.json
+
+# Typechain
+typechain
+typechain-types
+
+# Hardhat files
+cache
+`;
+};

packages/cli/src/scaffold/index.ts

@@ -5,6 +5,7 @@ import Protocol from '../protocols';
 import ABI from '../protocols/ethereum/abi';
 import { version } from '../version';
 import { getDockerFile } from './get-docker-file';
+import { getGitIgnore } from './get-git-ignore';
 import { generateEventIndexingHandlers } from './mapping';
 import { abiEvents, generateEventType, generateExampleEntityType } from './schema';
 import { generateTestsFiles } from './tests';
@@ -159,6 +160,10 @@ dataSources:
     return await prettier.format(getDockerFile(), { parser: 'yaml' });
   }
 
+  generateGitIgnoreFile() {
+    return getGitIgnore();
+  }
+
   async generateMappings() {
     return this.protocol.getMappingScaffold()
       ? { [`${strings.kebabCase(this.contractName)}.ts`]: await this.generateMapping() }
@@ -206,6 +211,7 @@ dataSources:
         'subgraph.yaml': await this.generateManifest(),
         'schema.graphql': await this.generateSchema(),
         'package.json': await this.generatePackageJsonForSubstreams(),
+        '.gitignore': await this.generateGitIgnoreFile(),
       };
     }
     return {
@@ -214,6 +220,7 @@ dataSources:
       'schema.graphql': await this.generateSchema(),
       'tsconfig.json': await this.generateTsConfig(),
       'docker-compose.yml': await this.generateDockerFileConfig(),
+      '.gitignore': await this.generateGitIgnoreFile(),
       src: await this.generateMappings(),
       abis: await this.generateABIs(),
       tests: await this.generateTests(),