Tweaks to bundler docs (#2867)

* WIP

* Fix typo

* Updates

* Document --compile

* Add bundler benchmark

* Remove esbuild

* Add bench to docs

* Add buttons

* Updates

1 files changed, 169 insertions, 25 deletions

diff --git a/docs/cli/build.md b/docs/cli/build.md
index f7113ae9f..e0cd36651 100644
--- a/docs/cli/build.md
+++ b/docs/cli/build.md
@@ -15,6 +15,10 @@ $ bun build ./index.tsx --outdir ./build
 
 {% /codetabs %}
 
+It's fast. The numbers below represent performance on esbuild's [three.js benchmark](https://github.com/oven-sh/bun/tree/main/bench/bundle).
+
+{% image src="/images/bundler-speed.png" caption="Bundling 10 copies of three.js from scratch, with sourcemaps and minification" /%}
+
 ## Why bundle?
 
 The bundler is a key piece of infrastructure in the JavaScript ecosystem. As a brief overview of why bundling is so important:
@@ -207,7 +211,7 @@ Refer to the [Bundler > Loaders](/docs/bundler/loaders#file) page for more compl
 
 ### Plugins
 
-The behavior described in this table can be overridden with [plugins](/docs/bundler/plugins). Refer to the [Bundler > Loaders](/docs/bundler/plugins) page for complete documentation.
+The behavior described in this table can be overridden or extended with [plugins](/docs/bundler/plugins). Refer to the [Bundler > Loaders](/docs/bundler/plugins) page for complete documentation.
 
 ## API
 
@@ -217,9 +221,9 @@ The behavior described in this table can be overridden with [plugins](/docs/bund
 
 {% codetabs group="a" %}
 
-```ts #JavaScript
+```ts#JavaScript
 const result = await Bun.build({
-  entrypoints: ['./index.ts']
+  entrypoints: ["./index.ts"],
 });
 // => { success: boolean, outputs: BuildArtifact[], logs: BuildMessage[] }
 ```
@@ -253,11 +257,11 @@ $ bun build --entrypoints ./index.ts --outdir ./out
 
 {% /codetabs %}
 
-If `outdir` is not passed to the JavaScript API, bundled code will not be written to disk. Bundled files are returned in an array of `BuildArtifact` objects. These objects are Blobs with extra properties.
+If `outdir` is not passed to the JavaScript API, bundled code will not be written to disk. Bundled files are returned in an array of `BuildArtifact` objects. These objects are Blobs with extra properties; see [Outputs](#outputs) for complete documentation.
 
 ```ts
 const result = await Bun.build({
-  entrypoints: ['./index.ts']
+  entrypoints: ["./index.ts"],
 });
 
 for (const result of result.outputs) {
@@ -272,7 +276,7 @@ for (const result of result.outputs) {
 }
 ```
 
-When `outdir` is set, the `.path` on `BuildArtifact` will be the absolute path to where it was written to.
+When `outdir` is set, the `path` property on a `BuildArtifact` will be the absolute path to where it was written to.
 
 ### `target`
 
@@ -312,6 +316,8 @@ Depending on the target, Bun will apply different module resolution rules and op
 
   All bundles generated with `target: "bun"` are marked with a special `// @bun` pragma, which indicates to the Bun runtime that there's no need to re-transpile the file before execution.
 
+  If any entrypoints contains a Bun shebang (`#!/usr/bin/env bun`) the bundler will default to `target: "bun"` instead of `"browser`.
+
 ---
 
 - `node`
@@ -319,6 +325,10 @@ Depending on the target, Bun will apply different module resolution rules and op
 
 {% /table %}
 
+{% callout %}
+
+{% /callout %}
+
 ### `format`
 
 Specifies the module format to be used in the generated bundles.
@@ -1051,18 +1061,133 @@ $ bun build ./index.tsx --outdir ./out --loader .png:dataurl --loader .txt:file
 
 {% /codetabs %}
 
+## Outputs
+
+The `Bun.build` function returns a `Promise<BuildOutput>`, defined as:
+
+```ts
+interface BuildOutput {
+  outputs: BuildArtifact[];
+  success: boolean;
+  logs: Array<object>; // see docs for details
+}
 
-## Error handling
+interface BuildArtifact extends Blob {
+  kind: "entry-point" | "chunk" | "asset" | "sourcemap";
+  path: string;
+  loader: Loader;
+  hash: string | null;
+  sourcemap: BuildArtifact | null;
+}
+```
 
-`Bun.build` only throws if invalid options are provided. You should read the `success` and `logs` properties of the result to determine whether the build was successful.
+The `outputs` array contains all the files that were generated by the build. Each artifact implements the `Blob` interface.
+
+```ts
+const build = Bun.build({
+  /* */
+});
+
+for (const output of build.outputs) {
+  await output.arrayBuffer(); // => ArrayBuffer
+  await output.text(); // string
+}
+```
+
+Each artifact also contains the following properties:
+
+{% table %}
+
+---
+
+- `kind`
+- What kind of build output this file is. A build generates bundled entrypoints, code-split "chunks", sourcemaps, and copied assets (like images).
+
+---
+
+- `path`
+- Absolute path to the file on disk
+
+---
+
+- `loader`
+- The loader was used to interpret the file. See [Bundler > Loaders](/docs/bundler/loaders) to see how Bun maps file extensions to the appropriate built-in loader.
+
+---
+
+- `hash`
+- The hash of the file contents. Always defined for assets.
+
+---
+
+- `sourcemap`
+- The sourcemap file corresponding to this file, if generated. Only defined for entrypoints and chunks.
+
+{% /table %}
+
+Similar to `BunFile`, `BuildArtifact` objects can be passed directly into `new Response()`.
+
+```ts
+const build = Bun.build({
+  /* */
+});
+
+const artifact = build.outputs[0];
+
+// Content-Type header is automatically set
+return new Response(artifact);
+```
+
+The Bun runtime implements special pretty-printing of `BuildArtifact` object to make debugging easier.
+
+{% codetabs %}
+
+```ts#Build_script
+// build.ts
+const build = Bun.build({/* */});
+
+const artifact = build.outputs[0];
+console.log(artifact);
+```
+
+```sh#Shell_output
+$ bun run build.ts
+BuildArtifact (entry-point) {
+  path: "./index.js",
+  loader: "tsx",
+  kind: "entry-point",
+  hash: "824a039620219640",
+  Blob (114 bytes) {
+    type: "text/javascript;charset=utf-8"
+  },
+  sourcemap: null
+}
+```
+
+{% /codetabs %}
+
+### Executables
+
+Bun supports "compiling" a JavaScript/TypeScript entrypoint into a standalone executable. This executable contains a copy of the Bun binary.
+
+```sh
+$ bun build ./cli.tsx --outfile mycli --compile
+$ ./mycli
+```
+
+Refer to [Bundler > Executables](/docs/bundler/executables) for complete documentation.
+
+## Logs and errors
+
+`Bun.build` only throws if invalid options are provided. Read the `success` property to determine if the build was successful; the `logs` property will contain additional details.
 
 ```ts
 const result = await Bun.build({
-  entrypoints: ['./index.tsx'],
-  outdir: './out',
+  entrypoints: ["./index.tsx"],
+  outdir: "./out",
 });
 
-if(!result.success) {
+if (!result.success) {
   console.error("Build failed");
   for (const message of result.logs) {
     // Bun will pretty print the message object
@@ -1089,7 +1214,7 @@ class ResolveMessage extends BuildMessage {
 }
 ```
 
-If you want to throw an error from a failed build, consider passing the logs to an `AggregateError`. If uncaught, Bun will pretty print the contained messages nicely.
+If you want to throw an error from a failed build, consider passing the logs to an `AggregateError`. If uncaught, Bun will pretty-print the contained messages nicely.
 
 ```ts
 if (!result.success) {
@@ -1143,24 +1268,43 @@ interface BuildArtifact extends Blob {
   path: string;
   loader: Loader;
   hash?: string;
-  kind: "entry-point" | "chunk" | "asset" | "sourecemap";
+  kind: "entry-point" | "chunk" | "asset" | "sourcemap";
   sourcemap?: BuildArtifact;
 }
 
-type Loader =
-  | "js"
-  | "jsx"
-  | "ts"
-  | "tsx"
-  | "json"
-  | "toml"
-  | "file"
-  | "napi"
-  | "wasm"
-  | "text";
+type Loader = "js" | "jsx" | "ts" | "tsx" | "json" | "toml" | "file" | "napi" | "wasm" | "text";
+
+interface BuildOutput {
+  outputs: BuildArtifact[];
+  success: boolean;
+  logs: Array<BuildMessage | ResolveMessage>;
+}
+
+declare class ResolveMessage {
+  readonly name: "ResolveMessage";
+  readonly position: Position | null;
+  readonly code: string;
+  readonly message: string;
+  readonly referrer: string;
+  readonly specifier: string;
+  readonly importKind:
+    | "entry_point"
+    | "stmt"
+    | "require"
+    | "import"
+    | "dynamic"
+    | "require_resolve"
+    | "at"
+    | "at_conditional"
+    | "url"
+    | "internal";
+  readonly level: "error" | "warning" | "info" | "debug" | "verbose";
+
+  toString(): string;
+}
 ```
 
-<!-- 
+<!--
 interface BuildManifest {
   inputs: {
     [path: string]: {