refactor: use Yarn API directly

packages/agoric-cli/package.json

@@ -67,6 +67,8 @@
     "@endo/patterns": "^1.0.1",
     "@endo/promise-kit": "^1.0.1",
     "@iarna/toml": "^2.2.3",
+    "@yarnpkg/cli": "3.7.0",
+    "@yarnpkg/core": "3.5.4",
     "anylogger": "^0.21.0",
     "chalk": "^5.2.0",
     "commander": "^10.0.0",

packages/agoric-cli/scripts/get-sdk-package-names.js

@@ -3,7 +3,7 @@
 import { basename } from 'path';
 import { listWorkspaces } from '../src/lib/yarn.js';
 
-const workspaces = listWorkspaces();
+const workspaces = await listWorkspaces();
 
 const packageNames = workspaces.map(w => w.name);
 

packages/agoric-cli/src/install.js

@@ -32,7 +32,8 @@ export default async function installMain(progname, rawArgs, powers, opts) {
   const rimraf = file => pspawn('rm', ['-rf', file]);
 
   async function getWorktreePackagePaths(cwd = '.', map = new Map()) {
-    for (const { name, location } of listWorkspaces()) {
+    const workspaces = await listWorkspaces();
+    for (const { name, location } of workspaces) {
       map.set(name, path.resolve(cwd, location));
     }
     return map;

packages/agoric-cli/src/lib/yarn.js

@@ -1,26 +1,40 @@
 // @ts-check
-import { execFileSync } from 'child_process';
+import process from 'node:process';
+
+import { getPluginConfiguration } from '@yarnpkg/cli';
+import { Configuration, Project } from '@yarnpkg/core';
+
+const pluginConf = getPluginConfiguration();
 
 /**
  * Omits the root
  *
- * @returns {Array<{ location: string, name: string }>}
+ * @returns {Promise<Array<{ location: string, name: string }>>} e.g. {"location":"packages/zoe","name":"@agoric/zoe"}
  */
-export const listWorkspaces = () => {
-  const ndjson = execFileSync('yarn', ['workspaces', 'list', '--json'], {
-    stdio: ['ignore', 'pipe', 'inherit'],
-    shell: true,
-    encoding: 'utf-8',
-  });
-  return ndjson
-    .trim()
-    .split('\n')
-    .map(line => {
-      try {
-        return JSON.parse(line);
-      } catch (e) {
-        throw new Error(`Could not parse '${line}'`);
-      }
-    })
-    .filter(({ location }) => location !== '.');
+export const listWorkspaces = async () => {
+  const cwd = process.cwd();
+  const configuration = await Configuration.find(
+    // @ts-expect-error not a PortablePath
+    cwd,
+    pluginConf,
+  );
+  const { project } = await Project.find(
+    configuration,
+    configuration.startingCwd,
+  );
+  const { workspacesByIdent } = project;
+  const records = [];
+  for (const entry of workspacesByIdent.entries()) {
+    const [_, workspace] = entry;
+    const { locator, relativeCwd } = workspace;
+    // omit root
+    if (relativeCwd === '.') {
+      continue;
+    }
+    records.push({
+      location: relativeCwd,
+      name: locator.scope ? `@${locator.scope}/${locator.name}` : locator.name,
+    });
+  }
+  return records;
 };