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528import { describe, expect, test } from "bun:test";
import { tempDir } from "harness";
// Type definitions for metafile structure
interface MetafileImport {
path: string;
kind: string;
original?: string;
external?: boolean;
with?: { type: string };
}
interface MetafileInput {
bytes: number;
imports: MetafileImport[];
format?: "esm" | "cjs";
}
interface MetafileOutput {
bytes: number;
inputs: Record<string, { bytesInOutput: number }>;
imports: Array<{ path: string; kind: string; external?: boolean }>;
exports: string[];
entryPoint?: string;
cssBundle?: string;
}
interface Metafile {
inputs: Record<string, MetafileInput>;
outputs: Record<string, MetafileOutput>;
}
describe("bundler metafile", () => {
test("metafile option returns metafile object", async () => {
using dir = tempDir("metafile-test", {
"index.js": `import { foo } from "./foo.js"; console.log(foo);`,
"foo.js": `export const foo = "hello";`,
});
const result = await Bun.build({
entrypoints: [`${dir}/index.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
expect(typeof result.metafile).toBe("object");
// Check inputs structure
expect(result.metafile.inputs).toBeDefined();
expect(typeof result.metafile.inputs).toBe("object");
// Check outputs structure
expect(result.metafile.outputs).toBeDefined();
expect(typeof result.metafile.outputs).toBe("object");
});
test("metafile inputs contain file metadata", async () => {
using dir = tempDir("metafile-inputs-test", {
"entry.js": `import { helper } from "./helper.js"; helper();`,
"helper.js": `export function helper() { return 42; }`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
const inputKeys = Object.keys(inputs);
// Should have at least 2 input files
expect(inputKeys.length).toBeGreaterThanOrEqual(2);
// Each input should have bytes and imports
for (const key of inputKeys) {
const input = inputs[key];
expect(typeof input.bytes).toBe("number");
expect(input.bytes).toBeGreaterThan(0);
expect(Array.isArray(input.imports)).toBe(true);
}
});
test("metafile outputs contain chunk metadata", async () => {
using dir = tempDir("metafile-outputs-test", {
"main.js": `export const value = 123;`,
});
const result = await Bun.build({
entrypoints: [`${dir}/main.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
const outputKeys = Object.keys(outputs);
// Should have at least 1 output
expect(outputKeys.length).toBeGreaterThanOrEqual(1);
// Each output should have bytes, inputs, imports, exports
for (const key of outputKeys) {
const output = outputs[key];
expect(typeof output.bytes).toBe("number");
expect(typeof output.inputs).toBe("object");
expect(Array.isArray(output.imports)).toBe(true);
expect(Array.isArray(output.exports)).toBe(true);
}
});
test("metafile tracks import relationships", async () => {
using dir = tempDir("metafile-imports-test", {
"index.js": `import { a } from "./a.js"; console.log(a);`,
"a.js": `import { b } from "./b.js"; export const a = b + 1;`,
"b.js": `export const b = 10;`,
});
const result = await Bun.build({
entrypoints: [`${dir}/index.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
// Find the entry file in inputs
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let entryInput: MetafileInput | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("index.js")) {
entryInput = input;
break;
}
}
expect(entryInput).not.toBeNull();
// Entry should have an import to a.js
expect(entryInput!.imports.length).toBeGreaterThan(0);
});
test("metafile imports have resolved path and original specifier", async () => {
using dir = tempDir("metafile-resolved-path-test", {
"entry.js": `import { foo } from "./lib/helper.js"; console.log(foo);`,
"lib/helper.js": `export const foo = 42;`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
// Find the entry file in inputs
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let entryImports: MetafileImport[] | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("entry.js")) {
entryImports = input.imports;
break;
}
}
expect(entryImports).not.toBeNull();
expect(entryImports!.length).toBe(1);
const imp = entryImports![0];
// path should be the resolved path (contains lib/helper.js or lib\helper.js on Windows)
expect(imp.path.includes("lib/helper.js") || imp.path.includes("lib\\helper.js")).toBe(true);
expect(imp.kind).toBe("import-statement");
// original should be the original import specifier
expect(imp.original).toBe("./lib/helper.js");
});
test("metafile without option returns undefined", async () => {
using dir = tempDir("metafile-disabled-test", {
"test.js": `console.log("test");`,
});
const result = await Bun.build({
entrypoints: [`${dir}/test.js`],
// metafile is not set (defaults to false)
});
expect(result.success).toBe(true);
expect(result.metafile).toBeUndefined();
});
test("metafile tracks exports", async () => {
using dir = tempDir("metafile-exports-test", {
"lib.js": `export const foo = 1; export const bar = 2; export default function() {}`,
});
const result = await Bun.build({
entrypoints: [`${dir}/lib.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
const outputKeys = Object.keys(outputs);
expect(outputKeys.length).toBeGreaterThanOrEqual(1);
// Find the main output
const mainOutput = outputs[outputKeys[0]];
expect(mainOutput.exports).toBeDefined();
expect(Array.isArray(mainOutput.exports)).toBe(true);
});
test("metafile includes entryPoint for entry chunks", async () => {
using dir = tempDir("metafile-entrypoint-test", {
"entry.js": `console.log("entry");`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
const outputKeys = Object.keys(outputs);
// At least one output should have entryPoint
let hasEntryPoint = false;
for (const key of outputKeys) {
if (outputs[key].entryPoint) {
hasEntryPoint = true;
expect(typeof outputs[key].entryPoint).toBe("string");
break;
}
}
expect(hasEntryPoint).toBe(true);
});
test("metafile includes format for JS inputs", async () => {
using dir = tempDir("metafile-format-test", {
"esm.js": `export const x = 1;`,
});
const result = await Bun.build({
entrypoints: [`${dir}/esm.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
// At least one input should have format
let hasFormat = false;
for (const key of Object.keys(inputs)) {
if (inputs[key].format) {
hasFormat = true;
expect(["esm", "cjs"]).toContain(inputs[key].format);
break;
}
}
expect(hasFormat).toBe(true);
});
test("metafile detects cjs format for CommonJS files", async () => {
using dir = tempDir("metafile-cjs-format-test", {
"entry.js": `const foo = require("./foo.js"); console.log(foo);`,
"foo.js": `module.exports = { value: 42 };`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
// Find the foo.js file which uses CommonJS exports
let fooInput: MetafileInput | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("foo.js")) {
fooInput = input;
break;
}
}
expect(fooInput).not.toBeNull();
expect(fooInput!.format).toBe("cjs");
});
test("metafile marks external imports", async () => {
using dir = tempDir("metafile-external-test", {
"index.js": `import fs from "fs"; console.log(fs);`,
});
const result = await Bun.build({
entrypoints: [`${dir}/index.js`],
metafile: true,
external: ["fs"],
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let foundExternal = false;
for (const key of Object.keys(inputs)) {
const input = inputs[key];
for (const imp of input.imports) {
if (imp.path === "fs" && imp.external === true) {
foundExternal = true;
break;
}
}
}
expect(foundExternal).toBe(true);
});
test("metafile with code splitting", async () => {
using dir = tempDir("metafile-splitting-test", {
"a.js": `import { shared } from "./shared.js"; console.log("a", shared);`,
"b.js": `import { shared } from "./shared.js"; console.log("b", shared);`,
"shared.js": `export const shared = "shared value";`,
});
const result = await Bun.build({
entrypoints: [`${dir}/a.js`, `${dir}/b.js`],
metafile: true,
splitting: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
const outputKeys = Object.keys(outputs);
// With splitting, we should have more outputs (shared chunk)
expect(outputKeys.length).toBeGreaterThanOrEqual(2);
});
test("metafile includes with clause for JSON imports", async () => {
using dir = tempDir("metafile-with-json-test", {
"entry.js": `import data from "./data.json"; console.log(data);`,
"data.json": `{"key": "value"}`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
// Find the entry file in inputs
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let jsonImport: MetafileImport | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("entry.js")) {
for (const imp of input.imports) {
if (imp.path.includes("data.json")) {
jsonImport = imp;
break;
}
}
break;
}
}
expect(jsonImport).not.toBeNull();
expect(jsonImport!.with).toBeDefined();
expect(jsonImport!.with!.type).toBe("json");
});
test("metafile tracks require-call imports", async () => {
using dir = tempDir("metafile-require-test", {
"entry.js": `const foo = require("./foo.js"); console.log(foo);`,
"foo.js": `module.exports = { value: 42 };`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
// Find the entry file in inputs
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let requireImport: MetafileImport | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("entry.js")) {
for (const imp of input.imports) {
if (imp.path.includes("foo.js")) {
requireImport = imp;
break;
}
}
break;
}
}
expect(requireImport).not.toBeNull();
expect(requireImport!.kind).toBe("require-call");
});
test("metafile tracks dynamic-import imports", async () => {
using dir = tempDir("metafile-dynamic-import-test", {
"entry.js": `import("./dynamic.js").then(m => console.log(m));`,
"dynamic.js": `export const value = 123;`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
splitting: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
// Find the entry file in inputs
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
let dynamicImport: MetafileImport | null = null;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("entry.js")) {
for (const imp of input.imports) {
if (imp.kind === "dynamic-import" && imp.original === "./dynamic.js") {
dynamicImport = imp;
break;
}
}
break;
}
}
expect(dynamicImport).not.toBeNull();
expect(dynamicImport!.kind).toBe("dynamic-import");
expect(dynamicImport!.original).toBe("./dynamic.js");
// The path should be the final chunk path (e.g., "./chunk-xxx.js"), not the internal unique_key
expect(dynamicImport!.path).toMatch(/^\.\/chunk-[a-z0-9]+\.js$/);
// Verify the path corresponds to an actual output chunk
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
const outputPaths = Object.keys(outputs);
expect(outputPaths).toContain(dynamicImport!.path);
});
test("metafile includes cssBundle for CSS outputs", async () => {
using dir = tempDir("metafile-css-bundle-test", {
"entry.js": `import "./styles.css"; console.log("styled");`,
"styles.css": `.foo { color: red; }`,
});
const result = await Bun.build({
entrypoints: [`${dir}/entry.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const outputs = result.metafile.outputs as Record<string, MetafileOutput>;
// Find the JS output that should reference the CSS bundle
let foundCssBundle = false;
for (const [outputPath, output] of Object.entries(outputs)) {
if (outputPath.endsWith(".js") && output.cssBundle) {
foundCssBundle = true;
expect(typeof output.cssBundle).toBe("string");
expect(output.cssBundle.endsWith(".css")).toBe(true);
break;
}
}
expect(foundCssBundle).toBe(true);
});
test("metafile handles circular imports", async () => {
using dir = tempDir("metafile-circular-test", {
"a.js": `import { b } from "./b.js"; export const a = 1; console.log(b);`,
"b.js": `import { a } from "./a.js"; export const b = 2; console.log(a);`,
});
const result = await Bun.build({
entrypoints: [`${dir}/a.js`],
metafile: true,
});
expect(result.success).toBe(true);
expect(result.metafile).toBeDefined();
const inputs = result.metafile.inputs as Record<string, MetafileInput>;
const inputKeys = Object.keys(inputs);
// Should have both files
expect(inputKeys.length).toBe(2);
// Both files should have imports to each other
let aImportsB = false;
let bImportsA = false;
for (const [path, input] of Object.entries(inputs)) {
if (path.includes("a.js")) {
aImportsB = input.imports.some(imp => imp.path.includes("b.js"));
}
if (path.includes("b.js")) {
bImportsA = input.imports.some(imp => imp.path.includes("a.js"));
}
}
expect(aImportsB).toBe(true);
expect(bImportsA).toBe(true);
});
});