1 files changed, 75 insertions, 0 deletions

diff --git a/packages/eslint-plugin-turbo/lib/utils/getEnvVarDependencies.ts b/packages/eslint-plugin-turbo/lib/utils/getEnvVarDependencies.ts
new file mode 100644
index 0000000..a57e5eb
--- /dev/null
+++ b/packages/eslint-plugin-turbo/lib/utils/getEnvVarDependencies.ts
@@ -0,0 +1,75 @@
+import { getTurboConfigs } from "@turbo/utils";
+
+function findDependsOnEnvVars({
+  dependencies,
+}: {
+  dependencies?: Array<string>;
+}) {
+  if (dependencies) {
+    return (
+      dependencies
+        // filter for dep env vars
+        .filter((dep) => dep.startsWith("$"))
+        // remove leading $
+        .map((envVar) => envVar.slice(1, envVar.length))
+    );
+  }
+
+  return [];
+}
+
+function getEnvVarDependencies({
+  cwd,
+}: {
+  cwd: string | undefined;
+}): Record<string, Set<string>> | null {
+  const turboConfigs = getTurboConfigs(cwd);
+
+  if (!turboConfigs.length) {
+    return null;
+  }
+
+  const envVars: Record<string, Set<string>> = {
+    "//": new Set(),
+  };
+
+  turboConfigs.forEach((turboConfig) => {
+    const { config, workspacePath, isRootConfig } = turboConfig;
+
+    const key = isRootConfig ? "//" : workspacePath;
+    if (!envVars[key]) {
+      envVars[key] = new Set();
+    }
+
+    // handle globals
+    if (!("extends" in config)) {
+      const { globalDependencies = [], globalEnv = [] } = config;
+
+      const keys = [
+        ...findDependsOnEnvVars({
+          dependencies: globalDependencies,
+        }),
+        ...globalEnv,
+      ];
+      keys.forEach((k) => envVars[key].add(k));
+    }
+
+    // handle pipelines
+    const { pipeline = {} } = config;
+    Object.values(pipeline).forEach(({ env, dependsOn }) => {
+      if (dependsOn) {
+        findDependsOnEnvVars({ dependencies: dependsOn }).forEach((k) =>
+          envVars[key].add(k)
+        );
+      }
+
+      if (env) {
+        env.forEach((k) => envVars[key].add(k));
+      }
+    });
+  });
+
+  return envVars;
+}
+
+export default getEnvVarDependencies;