Improve 'copy devDependencies' step of include-test-real-service.yml

tools/pipelines/templates/include-test-real-service.yml

@@ -309,6 +309,8 @@ stages:
                 tar --extract --verbose --file $TAR_PATH ./dist/test
                 tar --extract --verbose --file $TAR_PATH ./src/test
 
+          # The test workload we are running frequently depends on devDependencies of the package being installed.
+          # To make sure these are available, copy them to the root package.json and reinstall.
           - task: Bash@3
             displayName: Copy devDependencies
             inputs:
@@ -321,7 +323,27 @@ stages:
                 node -e "
                   const { devDependencies } = require('$testPkgJsonPath');
                   const pkg = require('$pkgJsonPath');
-                  pkg.devDependencies=devDependencies;
+                  if (!pkg.devDependencies) {
+                    pkg.devDependencies = {};
+                  }
+                  // Avoid copying some common dev dependencies that should only be required at build time.
+                  // Keeping the dependency tree small helps reduce job time and likelihood of install failures, since
+                  // dependencies added as part of this step won't be reproducible via pnpm-lock.
+                  const avoidCopying = new Set([
+                    '@types/node',
+                    'typescript',
+                    '@microsoft/api-extractor',
+                    '@fluid-tools/build-cli',
+                    '@fluidframework/build-common',
+                    '@fluidframework/build-tools'
+                  ]);
+                  for (const [k, v] of Object.entries(devDependencies)) {
+                    if (!pkg.devDependencies[k] && !avoidCopying.has(k)) {
+                      // Note that if you use string interpolation, bash interpreting the dollar sign takes precedence.
+                      console.log('Adding devDependency ' + k + '@' + v);
+                      pkg.devDependencies[k] = v;
+                    }
+                  }
                   require('fs').writeFileSync('$pkgJsonPath', JSON.stringify(pkg));
                 "