7 files changed, 201 insertions, 0 deletions
diff --git a/packages/bun-ecosystem/.gitignore b/packages/bun-ecosystem/.gitignore
new file mode 100644
index 000000000..2817d4e0b
--- /dev/null
+++ b/packages/bun-ecosystem/.gitignore
@@ -0,0 +1,3 @@
+.DS_Store
+node_modules
+tmp
diff --git a/packages/bun-ecosystem/README.md b/packages/bun-ecosystem/README.md
new file mode 100644
index 000000000..2ed8df0c7
--- /dev/null
+++ b/packages/bun-ecosystem/README.md
@@ -0,0 +1,7 @@
+# bun-ecosystem
+
+A registry to test `npm` packages using Bun. This can be used as a tool to find bugs in Bun by running the test suites of these packages. In the future, we will run theses tests to catch regressions between releases.
+
+```sh
+bun run test
+```
diff --git a/packages/bun-ecosystem/bun.lockb b/packages/bun-ecosystem/bun.lockb
new file mode 100755
index 000000000..45d0385c1
--- /dev/null
+++ b/packages/bun-ecosystem/bun.lockb
diff --git a/packages/bun-ecosystem/package.json b/packages/bun-ecosystem/package.json
new file mode 100644
index 000000000..1899684cd
--- /dev/null
+++ b/packages/bun-ecosystem/package.json
@@ -0,0 +1,14 @@
+{
+  "private": true,
+  "dependencies": {
+    "globby": "^13.1.3"
+  },
+  "devDependencies": {
+    "bun-types": "canary",
+    "prettier": "^2.8.2"
+  },
+  "scripts": {
+    "format": "prettier --write src",
+    "test": "bun run src/runner.ts"
+  }
+}
+\ No newline at end of file
diff --git a/packages/bun-ecosystem/src/packages.ts b/packages/bun-ecosystem/src/packages.ts
new file mode 100644
index 000000000..677bfdf16
--- /dev/null
+++ b/packages/bun-ecosystem/src/packages.ts
@@ -0,0 +1,69 @@
+export type Package = {
+  readonly name: string;
+  readonly repository: string;
+  readonly cwd?: string;
+  readonly tests?: {
+    readonly style: "jest" | "ava" | "tape" | "custom";
+    readonly include: string[];
+    readonly exclude?: string[];
+    readonly disabled?: boolean;
+  };
+};
+
+export const packages: Package[] = [
+  {
+    name: "lodash",
+    repository: github("lodash/lodash"),
+    tests: {
+      style: "jest",
+      include: ["test/*.js"],
+      exclude: [
+        "debounce.test.js", // hangs runner
+        "size.test.js", // require('vm').runInNewContext()
+        "merge.test.js", // failing
+      ],
+    },
+  },
+  {
+    name: "chalk",
+    repository: github("chalk/chalk"),
+    tests: {
+      style: "ava",
+      include: ["test/*.js"],
+    },
+  },
+  {
+    name: "request",
+    repository: github("request/request"),
+    tests: {
+      style: "tape",
+      include: ["tests/*.js"],
+    },
+  },
+  {
+    name: "commander",
+    repository: github("tj/commander.js"),
+    tests: {
+      style: "jest",
+      include: ["tests/*.js"],
+    },
+  },
+  {
+    name: "express",
+    repository: github("expressjs/express"),
+    tests: {
+      style: "jest",
+      include: ["test/**/*.js"],
+      exclude: [
+        "test/res.sendStatus.js", // https://github.com/oven-sh/bun/issues/887
+        "test/Route.js", // https://github.com/oven-sh/bun/issues/2030
+      ],
+      // Most tests fail due to lack of "http2"
+      disabled: true,
+    },
+  },
+];
+
+function github(repository: string): string {
+  return `git@github.com:${repository}.git`;
+}
diff --git a/packages/bun-ecosystem/src/runner.ts b/packages/bun-ecosystem/src/runner.ts
new file mode 100644
index 000000000..8b4e42aa7
--- /dev/null
+++ b/packages/bun-ecosystem/src/runner.ts
@@ -0,0 +1,92 @@
+import type { Package } from "./packages";
+import { packages } from "./packages";
+import { existsSync, copyFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { globby } from "globby";
+
+for (const pkg of packages) {
+  try {
+    await loadPackage(pkg, "tmp");
+  } catch (error) {
+    console.error(pkg.name, error);
+  }
+}
+
+async function loadPackage(pkg: Package, cwd?: string): Promise<void> {
+  await gitClone({
+    cwd,
+    repository: pkg.repository,
+    name: pkg.name,
+  });
+  const dir = join(cwd ?? "", pkg.name, pkg.cwd ?? "");
+  await spawn({
+    cwd: dir,
+    cmd: ["bun", "install"],
+  });
+  if (!pkg.tests || pkg.tests.style !== "jest") {
+    return;
+  }
+  const files = await globby(pkg.tests.include, {
+    cwd: dir,
+    ignore: pkg.tests.exclude ?? [crypto.randomUUID()],
+    onlyFiles: true,
+    caseSensitiveMatch: false,
+  });
+  if (!files.length) {
+    throw new Error("No tests found");
+  }
+  for (const file of files) {
+    let path = file;
+    if (!file.includes(".test.")) {
+      const ext = path.lastIndexOf(".");
+      path = file.substring(0, ext) + ".test" + file.substring(ext);
+      copyFileSync(join(dir, file), join(dir, path));
+    }
+    await spawn({
+      cwd: dir,
+      cmd: ["bun", "wiptest", path],
+    });
+  }
+}
+
+type GitCloneOptions = {
+  repository: string;
+  cwd?: string;
+  name?: string;
+};
+
+async function gitClone(options: GitCloneOptions): Promise<void> {
+  const name = options.name ?? dirname(options.repository);
+  const cwd = options.cwd ?? process.cwd();
+  const path = join(cwd, name);
+  if (existsSync(path)) {
+    await spawn({
+      cwd: path,
+      cmd: ["git", "pull"],
+    });
+  } else {
+    const url = `${options.repository}`;
+    await spawn({
+      cwd,
+      cmd: ["git", "clone", "--single-branch", "--depth", "1", url, name],
+    });
+  }
+}
+
+type SpawnOptions = {
+  cwd: string;
+  cmd: string[];
+};
+
+async function spawn({ cwd, cmd }: SpawnOptions) {
+  const { exited } = await Bun.spawn({
+    cwd,
+    cmd,
+    stdout: "inherit",
+    stderr: "inherit",
+  });
+  const exitCode = await exited;
+  if (exitCode !== 0) {
+    throw new Error(`"${cmd.join(" ")}" exited with ${exitCode}`);
+  }
+}
diff --git a/packages/bun-ecosystem/tsconfig.json b/packages/bun-ecosystem/tsconfig.json
new file mode 100644
index 000000000..1b2f41220
--- /dev/null
+++ b/packages/bun-ecosystem/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "module": "ESNext",
+    "target": "ESNext",
+    "moduleResolution": "node",
+    "types": ["bun-types"],
+    "esModuleInterop": true,
+    "allowJs": true,
+    "strict": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "src"
+  ]
+}