1 files changed, 40 insertions, 0 deletions
diff --git a/devtools/shared/validate-breakpoint.sys.mjs b/devtools/shared/validate-breakpoint.sys.mjs
new file mode 100644
index 0000000000..b555355ce7
--- /dev/null
+++ b/devtools/shared/validate-breakpoint.sys.mjs
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Given a breakpoint location object, throws if the breakpoint look invalid
+ */
+export function validateBreakpointLocation({
+  sourceUrl,
+  sourceId,
+  line,
+  column,
+}) {
+  if (!sourceUrl && !sourceId) {
+    throw new Error(
+      `Breakpoints expect to have either a sourceUrl or a sourceId.`
+    );
+  }
+  if (sourceUrl && typeof sourceUrl != "string") {
+    throw new Error(
+      `Breakpoints expect to have sourceUrl string, got ${typeof sourceUrl} instead.`
+    );
+  }
+  // sourceId may be undefined for some sources keyed by URL
+  if (sourceId && typeof sourceId != "string") {
+    throw new Error(
+      `Breakpoints expect to have sourceId string, got ${typeof sourceId} instead.`
+    );
+  }
+  if (typeof line != "number") {
+    throw new Error(
+      `Breakpoints expect to have line number, got ${typeof line} instead.`
+    );
+  }
+  if (typeof column != "number") {
+    throw new Error(
+      `Breakpoints expect to have column number, got ${typeof column} instead.`
+    );
+  }
+}