fix: ensure concurrent non-statically analyzable dynamic imports do not sometimes fail (#17923)

Closes #17918

3 files changed, 123 insertions, 0 deletions

diff --git a/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.out b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.out
new file mode 100644
index 000000000..c344d0aae
--- /dev/null
+++ b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.out
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diff --git a/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.ts b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.ts
new file mode 100644
index 000000000..0832e40be
--- /dev/null
+++ b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/main.ts
@@ -0,0 +1,16 @@
+import * as path from "http://localhost:4545/deno_std/path/mod.ts";
+
+const currentDir = path.dirname(path.fromFileUrl(import.meta.url));
+const url = path.toFileUrl(path.join(currentDir, "./mod.ts"));
+const urls = [];
+
+// this is hard to reproduce, but doing this will help
+for (let i = 0; i < 100; i++) {
+  urls.push(url.toString() + "#" + i);
+}
+
+const results = await Promise.all(urls.map((url) => import(url)));
+
+for (const result of results) {
+  result.outputValue();
+}
diff --git a/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/mod.ts b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/mod.ts
new file mode 100644
index 000000000..56f2002ed
--- /dev/null
+++ b/cli/tests/testdata/run/dynamic_import_concurrent_non_statically_analyzable/mod.ts
@@ -0,0 +1,7 @@
+// sleep a bit so many concurrent tasks end up
+// attempting to build the graph at the same time
+import "http://localhost:4545/sleep/10";
+
+export function outputValue() {
+  console.log(parseInt(new URL(import.meta.url).hash.slice(1), 10));
+}