Fixes missing --json output on yarn install

.yarn/versions/45fda3ad.yml

@@ -0,0 +1,23 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/plugin-essentials": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-init"
+  - "@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/acceptance-tests/pkg-tests-specs/sources/commands/install.test.ts

@@ -1,8 +1,65 @@
 import {Filename, xfs, ppath, npath} from '@yarnpkg/fslib';
-import {tests}                       from 'pkg-tests-core';
+import {tests, misc}                 from 'pkg-tests-core';
 
 describe(`Commands`, () => {
   describe(`install`, () => {
+    test(
+      `it should print regular messages as JSON items when using --json`,
+      makeTemporaryEnv({}, async ({path, run, source}) => {
+        const {stdout} = await run(`install`, `--json`);
+
+        expect(misc.parseJsonStream(stdout)).toEqual([{
+          data: `Yarn 0.0.0`,
+          displayName: `YN0000`,
+          indent: `· `,
+          name: 0,
+          type: `info`,
+        }, {
+          data: `┌ Resolution step`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `└ Completed`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `┌ Fetch step`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `└ Completed`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `┌ Link step`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `└ Completed`,
+          displayName: `YN0000`,
+          indent: ``,
+          name: null,
+          type: `info`,
+        }, {
+          data: `Done`,
+          displayName: `YN0000`,
+          indent: `· `,
+          name: 0,
+          type: `info`,
+        }]);
+      }),
+    );
+
     test(
       `it should print the logs to the standard output when using --inline-builds`,
       makeTemporaryEnv({

packages/plugin-essentials/sources/commands/install.ts

@@ -344,15 +344,18 @@ export default class YarnCommand extends BaseCommand {
     // the Configuration and Install classes). Feel free to open an issue
     // in order to ask for design feedback before writing features.
 
-    return await project.installWithNewReport({
+    const report = await StreamReport.start({
+      configuration,
       json: this.json,
       stdout: this.context.stdout,
-    }, {
-      cache,
-      immutable,
-      checkResolutions,
-      mode: this.mode,
+      forceSectionAlignment: true,
+      includeLogs: true,
+      includeVersion: true,
+    }, async report => {
+      await project.install({cache, report, immutable, checkResolutions, mode: this.mode});
     });
+
+    return report.exitCode();
   }
 }