feat(plugin-init): generate .gitattributes file (#5205)

* feat(plugin-init): generate .gitattributes file

* add version

Author: cometkim

.yarn/versions/a86095cf.yml

@@ -0,0 +1,23 @@
+releases:
+  "@yarnpkg/cli": minor
+  "@yarnpkg/plugin-init": minor
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

packages/plugin-init/sources/commands/init.ts

@@ -198,6 +198,23 @@ export default class InitCommand extends BaseCommand {
         changedPaths.push(gitignorePath);
       }
 
+      const gitattributesLines = [
+        `/.yarn/**            linguist-vendored`,
+        `/.yarn/releases/*    binary`,
+        `/.yarn/plugins/**/*  binary`,
+        `/.pnp.*              binary linguist-generated`,
+      ];
+
+      const gitattributesBody = gitattributesLines.map(line => {
+        return `${line}\n`;
+      }).join(``);
+
+      const gitattributesPath = ppath.join(this.context.cwd, `.gitattributes` as Filename);
+      if (!xfs.existsSync(gitattributesPath)) {
+        await xfs.writeFilePromise(gitattributesPath, gitattributesBody);
+        changedPaths.push(gitattributesPath);
+      }
+
       const editorConfigProperties = {
         [`*`]: {
           endOfLine: `lf`,