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load-app-config.test.ts
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load-app-config.test.ts
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import assert from "assert";
import { mkdtemp, mkdir, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { loadAppConfigModule } from "./load-app-config.js";
async function ensureModuleType(dir: string) {
await writeFile(
path.join(dir, "package.json"),
JSON.stringify({ type: "module" }),
"utf-8"
);
}
describe("loadAppConfigModule", () => {
let projectDir: string;
beforeEach(async () => {
projectDir = await mkdtemp(
path.join(os.tmpdir(), "sealgen-load-config-test-")
);
await ensureModuleType(projectDir);
});
afterEach(async () => {
await rm(projectDir, { recursive: true, force: true });
});
async function writeConfigFile(contents: string) {
const distBackDir = path.join(projectDir, "dist/back");
await mkdir(distBackDir, { recursive: true });
await writeFile(path.join(distBackDir, "config.js"), contents, "utf-8");
}
it("loads named exports", async () => {
await writeConfigFile(`export const PORT = 5555;`);
const config = await loadAppConfigModule(projectDir);
assert.deepStrictEqual(config, { PORT: 5555 });
});
it("loads default exports", async () => {
await writeConfigFile(`export default { PORT: 6060 };`);
const config = await loadAppConfigModule(projectDir);
assert.deepStrictEqual(config, { PORT: 6060 });
});
it("loads config property exports", async () => {
await writeConfigFile(`export const config = { PORT: 7070 };`);
const config = await loadAppConfigModule(projectDir);
assert.deepStrictEqual(config, { PORT: 7070 });
});
it("returns null when the config file is missing", async () => {
const config = await loadAppConfigModule(projectDir);
assert.strictEqual(config, null);
});
});

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