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fix: await async generator return value in warpgrep_codebase_search (Bun compatibility Issue) #25

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Merged
bhaktatejas922 merged 1 commit into from
Jun 17, 2026
Merged

fix: await async generator return value in warpgrep_codebase_search (Bun compatibility Issue) #25

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40 changes: 40 additions & 0 deletions index.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1156,3 +1156,43 @@ describe("formatWarpGrepResult edge cases", () => {
expect(result).toBe("Search failed: timeout after 60s");
});
});

describe("warpgrep_codebase_search result handling", () => {
test("awaits the async generator return value (Bun compatibility)", async () => {
const fakeResult = {
success: true,
contexts: [
{ file: "src/auth.ts", content: "code", lines: [[1, 5]] as Array<[number, number]> },
],
summary: "found auth",
};

const original = WarpGrepClient.prototype.execute;
// Async generator that returns a result via `return` (not yield).
// In Bun, `return value` in an async generator may not auto-await,
// so the plugin must explicitly await the final .next() value.
WarpGrepClient.prototype.execute = async function* (): AsyncGenerator {
return fakeResult;
} as any;

try {
const { default: MorphPlugin } = await importPluginWithEnv({
MORPH_API_KEY: "sk-test-key",
});
const hooks = await MorphPlugin(
makePluginInput("/tmp/morph-warpgrep-async-test"),
);
const output = (await hooks.tool.warpgrep_codebase_search.execute(
{ search_term: "auth flow" },
makeToolContext("/tmp/morph-warpgrep-async-test"),
)) as string;

// Without the `await` fix, `value` is a Promise, `result.success` is
// undefined, and formatWarpGrepResult returns the generic failure message.
expect(output).toContain("Relevant context found:");
expect(output).toContain("src/auth.ts");
} finally {
WarpGrepClient.prototype.execute = original;
}
});
});
6 changes: 5 additions & 1 deletion index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1046,7 +1046,11 @@ Get your API key at: https://morphllm.com/dashboard/api-keys`;
for (;;) {
const { value, done } = await generator.next();
if (done) {
result = value;
// Bun: morphsdk's async generator returns an unawaited Promise
// from processAgentResult() via `return promise`. Node.js
// auto-awaits it per spec, but Bun does not. Explicitly await
// so the resolved WarpGrepResult is used instead of a Promise.
result = await value as WarpGrepResult;
break;
}
turnCount = value.turn;
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