initial commit

test/bundler/bundler_banner.test.ts

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+import { describe, expect } from "bun:test";
+import { itBundled } from "./expectBundled";
+
+describe("bundler", () => {
+  itBundled("banner/CommentBanner", {
+    banner: "// developed with love in SF",
+    files: {
+      "/a.js": `console.log("Hello, world!")`,
+    },
+    onAfterBundle(api) {
+      api.expectFile("out.js").toContain("// developed with love in SF");
+    },
+  });
+  itBundled("banner/MultilineBanner", {
+    banner: `"use client";
+// This is a multiline banner
+// It can contain multiple lines of comments or code`,
+    files: {
+      /* js*/ "index.js": `console.log("Hello, world!")`,
+    },
+    onAfterBundle(api) {
+      api.expectFile("out.js").toContain(`"use client";
+// This is a multiline banner
+// It can contain multiple lines of comments or code`);
+    },
+  });
+  itBundled("banner/UseClientBanner", {
+    banner: '"use client";',
+    files: {
+      /* js*/ "index.js": `console.log("Hello, world!")`,
+    },
+    onAfterBundle(api) {
+      api.expectFile("out.js").toContain('"use client";');
+    },
+  });
+
+  itBundled("banner/BannerWithCJSAndTargetBun", {
+    banner: "// Copyright 2024 Example Corp",
+    format: "cjs",
+    target: "bun",
+    backend: "api",
+    outdir: "/out",
+    minifyWhitespace: true,
+    files: {
+      "a.js": `module.exports = 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      expect(content).toMatchInlineSnapshot(`
+        "// @bun @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Copyright 2024 Example Corp
+        module.exports=1;})
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/HashbangBannerWithCJSAndTargetBun", {
+    banner: "#!/usr/bin/env -S node --enable-source-maps\n// Additional banner content",
+    format: "cjs",
+    target: "bun",
+    backend: "api",
+    outdir: "/out",
+    minifyWhitespace: true,
+    files: {
+      "/a.js": `module.exports = 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      expect(content).toMatchInlineSnapshot(`
+        "#!/usr/bin/env -S node --enable-source-maps
+        // @bun @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Additional banner content
+        module.exports=1;})
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/SourceHashbangWithBannerAndCJSTargetBun", {
+    banner: "// Copyright 2024 Example Corp",
+    format: "cjs",
+    target: "bun",
+    outdir: "/out",
+    minifyWhitespace: true,
+    backend: "api",
+    files: {
+      "/a.js": `#!/usr/bin/env node
+module.exports = 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      expect(content).toMatchInlineSnapshot(`
+        "#!/usr/bin/env node
+        // @bun @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Copyright 2024 Example Corp
+        module.exports=1;})
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/BannerWithESMAndTargetBun", {
+    banner: "// Copyright 2024 Example Corp",
+    format: "esm",
+    target: "bun",
+    backend: "api",
+    minifyWhitespace: true,
+    files: {
+      "/a.js": `export default 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("out.js");
+      // @bun comment should come first, then banner
+      const bunCommentIndex = content.indexOf("// @bun");
+      const bannerIndex = content.indexOf("// Copyright 2024 Example Corp");
+
+      expect(bunCommentIndex).toBe(0);
+      expect(bannerIndex).toBeGreaterThan(bunCommentIndex);
+      // No CJS wrapper in ESM format
+      expect(content).not.toContain("(function(exports, require, module, __filename, __dirname)");
+      expect(content).toMatchInlineSnapshot(`
+        "// @bun
+        // Copyright 2024 Example Corp
+        var a_default=1;export{a_default as default};
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/HashbangBannerWithESMAndTargetBun", {
+    banner: "#!/usr/bin/env -S node --enable-source-maps\n// Additional banner content",
+    format: "esm",
+    target: "bun",
+    backend: "api",
+    outdir: "/out",
+    minifyWhitespace: true,
+    files: {
+      "/a.js": `export default 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      expect(content).toMatchInlineSnapshot(`
+        "#!/usr/bin/env -S node --enable-source-maps
+        // @bun
+        // Additional banner content
+        var a_default=1;export{a_default as default};
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/BannerWithBytecodeAndCJSTargetBun", {
+    banner: "// Copyright 2024 Example Corp",
+    format: "cjs",
+    target: "bun",
+    backend: "api",
+    bytecode: true,
+    minifyWhitespace: true,
+    outdir: "/out",
+    files: {
+      "/a.js": `module.exports = 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      expect(content).toMatchInlineSnapshot(`
+        "// @bun @bytecode @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Copyright 2024 Example Corp
+        module.exports=1;})
+        "
+      `);
+      // @bun @bytecode @bun-cjs comment should come first, then CJS wrapper, then banner
+      const bunBytecodeIndex = content.indexOf("// @bun @bytecode @bun-cjs");
+      const wrapperIndex = content.indexOf("(function(exports, require, module, __filename, __dirname) {");
+      const bannerIndex = content.indexOf("// Copyright 2024 Example Corp");
+
+      expect(bunBytecodeIndex).toBe(0);
+      expect(wrapperIndex).toBeGreaterThan(bunBytecodeIndex);
+      expect(bannerIndex).toBeGreaterThan(wrapperIndex);
+    },
+  });
+
+  itBundled("banner/HashbangBannerWithBytecodeAndCJSTargetBun", {
+    banner: "#!/usr/bin/env bun\n// Production build",
+    format: "cjs",
+    target: "bun",
+    bytecode: true,
+    backend: "api",
+    outdir: "/out",
+    minifyWhitespace: true,
+    files: {
+      "/a.js": `module.exports = 1;`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+
+      expect(content).toMatchInlineSnapshot(`
+        "#!/usr/bin/env bun
+        // @bun @bytecode @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Production build
+        module.exports=1;})
+        "
+      `);
+    },
+  });
+
+  itBundled("banner/SourceHashbangWithBytecodeAndCJSTargetBun", {
+    banner: "// Copyright 2024 Example Corp",
+    format: "cjs",
+    target: "bun",
+    bytecode: true,
+    outdir: "/out",
+    minifyWhitespace: true,
+    backend: "api",
+    files: {
+      "/a.js": `#!/usr/bin/env bun
+module.exports = 1;
+console.log("bun!");`,
+    },
+    onAfterBundle(api) {
+      const content = api.readFile("/out/a.js");
+      // Shebang from source should come first, then @bun pragma
+      expect(content).toMatchInlineSnapshot(`
+        "#!/usr/bin/env bun
+        // @bun @bytecode @bun-cjs
+        (function(exports, require, module, __filename, __dirname) {// Copyright 2024 Example Corp
+        module.exports=1;console.log("bun!");})
+        "
+      `);
+    },
+    run: {
+      stdout: "bun!\n",
+    },
+  });
+});