1 files changed, 43 insertions, 0 deletions

diff --git a/packages/turbo-ignore/src/errors.ts b/packages/turbo-ignore/src/errors.ts
new file mode 100644
index 0000000..f600dfb
--- /dev/null
+++ b/packages/turbo-ignore/src/errors.ts
@@ -0,0 +1,43 @@
+import { NonFatalErrorKey, NonFatalErrors } from "./types";
+
+export const NON_FATAL_ERRORS: NonFatalErrors = {
+  MISSING_LOCKFILE: {
+    regex:
+      /reading (yarn.lock|package-lock.json|pnpm-lock.yaml):.*?no such file or directory/,
+    message: `turbo-ignore could not complete - no lockfile found, please commit one to your repository`,
+  },
+  NO_PACKAGE_MANAGER: {
+    regex:
+      /run failed: We did not detect an in-use package manager for your project/,
+    message: `turbo-ignore could not complete - no package manager detected, please commit a lockfile, or set "packageManager" in your root "package.json"`,
+  },
+  UNREACHABLE_PARENT: {
+    regex: /failed to resolve packages to run: commit HEAD\^ does not exist/,
+    message: `turbo-ignore could not complete - parent commit does not exist or is unreachable`,
+  },
+  UNREACHABLE_COMMIT: {
+    regex: /commit \S+ does not exist/,
+    message: `turbo-ignore could not complete - commit does not exist or is unreachable`,
+  },
+};
+
+export function shouldWarn({ err }: { err: string }): {
+  level: "warn" | "error";
+  message: string;
+  code: NonFatalErrorKey | "UNKNOWN_ERROR";
+} {
+  const knownError = Object.keys(NON_FATAL_ERRORS).find((key) => {
+    const { regex } = NON_FATAL_ERRORS[key as NonFatalErrorKey];
+    return regex.test(err);
+  });
+
+  if (knownError) {
+    return {
+      level: "warn",
+      message: NON_FATAL_ERRORS[knownError as NonFatalErrorKey].message,
+      code: knownError as NonFatalErrorKey,
+    };
+  }
+
+  return { level: "error", message: err, code: "UNKNOWN_ERROR" };
+}