diff --git a/R/conditions.R b/R/conditions.R
new file mode 100644
index 00000000..f6e539d9
--- /dev/null
+++ b/R/conditions.R
@@ -0,0 +1,23 @@
+create_condition = function(.signal, .msg, ..., .class, .attach) {
+  assert_string(.msg)
+  assert_character(.class, any.missing = FALSE, min.chars = 1L, null.ok = TRUE)
+  assert_list(.attach, null.ok = TRUE, names = "unique")
+
+  condition = insert_named(list(message = sprintf(.msg, ...), call = NULL), .attach)
+  set_class(condition, c(.class, .signal, "condition"))
+}
+
+signal_message = function(.msg, ..., .class = NULL, .attach = NULL) {
+  condition = create_condition("message", .msg = .msg, ..., .class = .class, .attach = .attach)
+  message(condition)
+}
+
+signal_warning = function(.msg, ..., .class = NULL, .attach = NULL) {
+  condition = create_condition("warning", .msg = .msg, ..., .class = .class, .attach = .attach)
+  warning(condition)
+}
+
+signal_error = function(.msg, ..., .class = NULL, .attach = NULL) {
+  condition = create_condition("error", .msg = .msg, ..., .class = .class, .attach = .attach)
+  warning(condition)
+}