diff --git a/pkg/testing/integration/program.go b/pkg/testing/integration/program.go
index abfb9ee25..c37e2992b 100644
--- a/pkg/testing/integration/program.go
+++ b/pkg/testing/integration/program.go
@@ -246,17 +246,27 @@ func prepareProject(t *testing.T, srcDir string, lumiSrc string, opts LumiProgra
 	}
 
 	// Now ensure dependencies are present.
-	RunCommand(t, []string{opts.YarnBin, "install", "--verbose"}, dir, opts)
+	RunCommand(t, withOptionalYarnFlags([]string{opts.YarnBin, "install", "--verbose"}), dir, opts)
 	for _, dependency := range opts.Dependencies {
-		RunCommand(t, []string{opts.YarnBin, "link", dependency}, dir, opts)
+		RunCommand(t, withOptionalYarnFlags([]string{opts.YarnBin, "link", dependency}), dir, opts)
 	}
 
 	// And finally compile it using whatever build steps are in the package.json file.
-	RunCommand(t, []string{opts.YarnBin, "run", "build"}, dir, opts)
+	RunCommand(t, withOptionalYarnFlags([]string{opts.YarnBin, "run", "build"}), dir, opts)
 
 	return dir, nil
 }
 
+func withOptionalYarnFlags(args []string) []string {
+	flags := os.Getenv("YARNFLAGS")
+
+	if flags != "" {
+		return append(args, flags)
+	}
+
+	return args
+}
+
 // copyFile is a braindead simple function that copies a src file to a dst file.  Note that it is not general purpose:
 // it doesn't handle symbolic links, it doesn't try to be efficient, it doesn't handle copies where src and dst overlap,
 // and it makes no attempt to preserve file permissions.  It is what we need for this test package, no more, no less.
diff --git a/sdk/nodejs/Makefile b/sdk/nodejs/Makefile
index 1ee51874b..1aa5ac7b7 100644
--- a/sdk/nodejs/Makefile
+++ b/sdk/nodejs/Makefile
@@ -11,14 +11,14 @@ banner:
 
 .PHONY: configure
 configure:
-	yarn install
+	yarn install $(YARNFLAGS)
 	cd runtime/native && ./ensure_node_v8.sh
 	cd runtime/native && ../../node_modules/.bin/node-gyp configure
 
 .PHONY: lint
 lint:
 	@echo "\033[0;32mLINT:\033[0m"
-	yarn run lint
+	yarn run lint $(YARNFLAGS)
 
 .PHONY: clean
 clean:
@@ -27,16 +27,16 @@ clean:
 .PHONY: build
 build:
 	@echo "\033[0;32mBUILD:\033[0m"
-	yarn run build
+	yarn run build $(YARNFLAGS)
 
 .PHONY: test
 test:
 	@echo "\033[0;32mTEST:\033[0m"
-	yarn run test
+	yarn run test $(YARNFLAGS)
 
 .PHONY: install
 install:
 	@echo "\033[0;32mINSTALL:\033[0m"
 	cp package.json bin/
-	cd bin/ && yarn link
+	cd bin/ && yarn link $(YARNFLAGS)
 
diff --git a/sdk/nodejs/package.json b/sdk/nodejs/package.json
index b1c7ee01c..fa595d69f 100644
--- a/sdk/nodejs/package.json
+++ b/sdk/nodejs/package.json
@@ -5,15 +5,15 @@
     "repository": "https://github.com/pulumi/pulumi/sdk/nodejs",
     "scripts": {
         "clean": "rm -rf bin/ && rm -rf runtime/native/build",
-        "build": "yarn run copyprotos && yarn run buildnative && tsc && yarn run binplace && yarn run lint",
+        "build": "yarn run copyprotos ${YARNFLAGS} && yarn run buildnative ${YARNFLAGS} && tsc && yarn run binplace ${YARNFLAGS} && yarn run lint ${YARNFLAGS}",
         "buildnative": "cd runtime/native/ && node-gyp build",
         "lint": "tslint '{,!(node_modules|bin)/!(bin|node_modules)**/}(*.d).ts'",
         "copyprotos": "cp -R ../proto/nodejs/. proto/",
         "binplaceprotos": "cp -R proto/. bin/proto/",
         "binplacenative": "mkdir -p bin/runtime/native/ && cp -R runtime/native/build/. bin/runtime/native/build/",
         "binplacetestdata": "mkdir -p bin/tests/runtime/langhost/cases/ && find tests/runtime/langhost/cases/* -type d -exec cp -R {} bin/tests/runtime/langhost/cases/ \\;",
-        "binplace": "yarn run binplaceprotos && yarn run binplacenative && yarn run binplacetestdata",
-        "test": "yarn run cov && yarn run covreport",
+        "binplace": "yarn run binplaceprotos ${YARNFLAGS} && yarn run binplacenative ${YARNFLAGS} && yarn run binplacetestdata ${YARNFLAGS}",
+        "test": "yarn run cov ${YARNFLAGS} && yarn run covreport ${YARNFLAGS}",
         "cov": "istanbul cover --print none node_modules/.bin/_mocha -- --timeout 15000 'bin/tests/**/*.spec.js'",
         "covreport": "istanbul report text-summary && istanbul report text"
     },