1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/shared/validate-breakpoint.jsm b/devtools/shared/validate-breakpoint.jsm
new file mode 100644
index 0000000000..b065ead7aa
--- /dev/null
+++ b/devtools/shared/validate-breakpoint.jsm
@@ -0,0 +1,49 @@
+/* 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/. */
+
+"use strict";
+
+// Because this function is used from SessionDataHelpers.jsm,
+// this has to be a JSM.
+
+var EXPORTED_SYMBOLS = ["validateBreakpointLocation"];
+
+/**
+ * Given a breakpoint location object, throws if the breakpoint look invalid
+ */
+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.`
+    );
+  }
+}
+
+// Allow this JSM to also be loaded as a CommonJS module
+// Because this module is used from the worker thread,
+// and workers can't load JSMs.
+if (typeof module == "object") {
+  module.exports.validateBreakpointLocation = validateBreakpointLocation;
+}