javascript: fix running scripts with yarn (pantsbuild#20543)

Fixes pantsbuild#20542

src/python/pants/backend/javascript/run/rules.py

@@ -45,11 +45,16 @@ async def run_node_build_script(
     target_env_vars = await Get(
         EnvironmentVars, EnvironmentVarsRequest(field_set.extra_env_vars.value or ())
     )
+
+    prefix_arg = "--prefix"
+    if installation.project_env.project.package_manager == "yarn":
+        prefix_arg = "--cwd"
+
     process = await Get(
         Process,
         NodeJsProjectEnvironmentProcess(
             installation.project_env,
-            args=("--prefix", "{chroot}", "run", str(field_set.entry_point.value)),
+            args=(prefix_arg, "{chroot}", "run", str(field_set.entry_point.value)),
             description=f"Running {str(field_set.entry_point.value)}.",
             input_digest=installation.digest,
             extra_env=target_env_vars,

src/python/pants/backend/javascript/run/rules_test.py

@@ -35,7 +35,7 @@ def rule_runner() -> RuleRunner:
     return rule_runner
 
 
-def test_creates_run_requests_package_json_scripts(rule_runner: RuleRunner) -> None:
+def test_creates_npm_run_requests_package_json_scripts(rule_runner: RuleRunner) -> None:
     rule_runner.write_files(
         {
             "src/js/BUILD": dedent(
@@ -77,6 +77,49 @@ def test_creates_run_requests_package_json_scripts(rule_runner: RuleRunner) -> N
         assert result.args == ("npm", "--prefix", "{chroot}", "run", script)
 
 
+def test_creates_yarn_run_requests_package_json_scripts(rule_runner: RuleRunner) -> None:
+    rule_runner.write_files(
+        {
+            "src/js/BUILD": dedent(
+                """\
+                package_json(
+                    scripts=[
+                        node_build_script(entry_point="build", output_directories=["dist"]),
+                        node_build_script(entry_point="compile", output_directories=["dist"]),
+                        node_build_script(entry_point="transpile", output_directories=["dist"]),
+                    ]
+                )
+                """
+            ),
+            "src/js/package.json": json.dumps(
+                {
+                    "name": "ham",
+                    "version": "0.0.1",
+                    "browser": "lib/index.mjs",
+                    "scripts": {
+                        "build": "swc ./lib -d dist",
+                        "transpile": "babel ./lib -d dist",
+                        "compile": "tsc ./lib --emit -d bin",
+                    },
+                    "packageManager": "[email protected]",
+                }
+            ),
+            "src/js/yarn.lock": "",
+            "src/js/lib/BUILD": dedent(
+                """\
+                javascript_sources()
+                """
+            ),
+            "src/js/lib/index.mjs": "",
+        }
+    )
+    for script in ("build", "compile", "transpile"):
+        tgt = rule_runner.get_target(Address("src/js", generated_name=script))
+        result = rule_runner.request(RunRequest, [RunNodeBuildScriptFieldSet.create(tgt)])
+
+        assert result.args == ("yarn", "--cwd", "{chroot}", "run", script)
+
+
 def test_extra_envs(rule_runner: RuleRunner) -> None:
     rule_runner.write_files(
         {