diff --git a/docs/rfcs/README.md b/docs/rfcs/README.md
index 65ef33ead8..ffa91d8e05 100644
--- a/docs/rfcs/README.md
+++ b/docs/rfcs/README.md
@@ -1,4 +1,5 @@
 # RFCs
 
-| Number | Name | Issue |
-| ------ | ---- | ----- |
+| Number | Name              | Issue                        |
+| ------ | ----------------- | ---------------------------- |
+| 1      | `Bun.Bundler` API | (Proposal)[./bun-bundler.ts] |
diff --git a/docs/rfcs/bun-bundler.ts b/docs/rfcs/bun-bundler.ts
new file mode 100644
index 0000000000..8453857649
--- /dev/null
+++ b/docs/rfcs/bun-bundler.ts
@@ -0,0 +1,235 @@
+/**
+ * Bundler API
+ *
+ * This is a proposal for the JavaScript API for Bun's native bundler.
+ */
+
+import { BunPlugin, FileBlob } from "bun";
+
+export type JavaScriptLoader = "jsx" | "js" | "ts" | "tsx";
+export type MacroMap = Record<string, Record<string, string>>;
+export type Target = "bun" | "browser" | "node" | "neutral";
+export type Format = "iife" | "cjs" | "esm";
+export type JsxTransform = "transform" | "preserve" | "automatic";
+export type Loader =
+  | "base64"
+  | "binary"
+  | "copy"
+  | "css"
+  | "dataurl"
+  | "default"
+  | "empty"
+  | "file"
+  | "js"
+  | "json"
+  | "jsx"
+  | "text"
+  | "ts"
+  | "tsx";
+export type LogLevel = "verbose" | "debug" | "info" | "warning" | "error" | "silent";
+export type Charset = "ascii" | "utf8";
+
+export interface BundlerOptions {
+  // currently this only accepts a Loader string
+  // change: set an ext->loader map
+  loader?: { [k in string]: Loader };
+
+  // rename `platform` to `target`
+  target?:
+    | Target
+    | {
+        name: Target; // e.g. 'node', 'browser'
+        // instead of esbuild's `target`
+        version?: string; // e.g. '18', 'es2020'
+        // low priority
+        supported?: Record<string, boolean>;
+      };
+
+  // currently accepts a tsconfig as stringified JSON or an object
+  // IMO this should accept a file path to a tsconfig.json file instead
+  // or at least in addition
+  // that's what most people are used to in config files
+  tsconfig?: string;
+
+  // I don't know what this is
+  allowBunRuntime?: boolean;
+
+  ////////////////////////////////
+  // no changes below this line //
+  ////////////////////////////////
+  macro?: MacroMap;
+  autoImportJSX?: boolean;
+  trimUnusedImports?: boolean;
+  jsxOptimizationInline?: boolean;
+  inline?: boolean;
+
+  sourcemap?:
+    | boolean
+    | {
+        root?: string;
+        inline?: boolean;
+        external?: boolean;
+
+        // probably unnecessary
+        content?: boolean;
+      };
+
+  format?:
+    | Format
+    | {
+        type: "iife";
+        globalName?: string;
+      };
+
+  logging?: {
+    color?: boolean;
+    level?: LogLevel;
+    // extremely low priority
+    limit?: number;
+    override?: Record<string, LogLevel>;
+  };
+
+  // removed: mangleProps, reserveProps, mangleQuoted, mangleCache
+
+  /** Documentation: https://esbuild.github.io/api/#minify */
+  minify?:
+    | boolean
+    | {
+        whitespace?: boolean;
+        identifiers?: boolean;
+        syntax?: boolean;
+      };
+
+  treeShaking?:
+    | boolean
+    | {
+        imports?: boolean;
+        code?: boolean;
+        // whether to believe @__PURE__
+        // I hate this
+        pure?: boolean;
+        // whether to believe package.json sideEffects
+        sideEffects?: boolean;
+      };
+
+  jsx?:
+    | JsxTransform
+    | {
+        transform?: JsxTransform;
+        factory?: string;
+        fragment?: string;
+        importSource?: string;
+        development?: boolean;
+        sideEffects?: boolean;
+      };
+
+  /**
+   * Low priority
+   * */
+  legalComments?: "none" | "inline" | "eof" | "linked" | "external";
+  charset?: Charset;
+}
+
+// `.build(options: BuildOptions)`
+// can override everything specified in Bundler options
+interface BuildOptions extends BundlerOptions {
+  bundle?: boolean; // default true
+  splitting?: boolean;
+  plugins?: BunPlugin[];
+  cwd?: string;
+  watch?: boolean;
+
+  // dropped: preserveSymlinks
+  // defer to tsconfig for this
+
+  // whether to parse manifest after build
+  manifest?: boolean;
+
+  // inputs
+  entrypoints: string[];
+  rootDir?: string; // equiv. outbase
+
+  memory?: boolean;
+
+  // no outfile; it can be specified with `outdir` and `outnames`
+  write?:
+    | string
+    | {
+        dir?: string;
+        overwrite?: boolean;
+      };
+
+  naming?: {
+    /** Documentation: https://esbuild.github.io/api/#entry-names */
+    entry?: string;
+    /** Documentation: https://esbuild.github.io/api/#chunk-names */
+    chunk?: string;
+    /** Documentation: https://esbuild.github.io/api/#asset-names */
+    asset?: string;
+    extensions?: { [ext: string]: string };
+  };
+
+  /** Documentation: https://esbuild.github.io/api/#external */
+  external?: {
+    // exclude matching identifiers
+    match?: (string | RegExp)[];
+    // mark all bare identifiers as external
+    bare?: boolean;
+  };
+
+  transform?: {
+    define?: Record<string, string>;
+    inject?: string[];
+    imports?: {
+      rename?: Record<string, string>;
+    };
+    exports?: {
+      pick?: string[];
+      omit?: string[];
+      rename?: Record<string, string>;
+      // replace definition with a code snippet?
+      // probably not workable
+      stub?: Record<string, string>;
+    };
+  };
+
+  // this should probably use the same resolution algorithm as Bun's runtime
+  resolve?: {
+    conditions?: string[];
+    // unclear if either of these should be customizable 👇
+    mainFields?: string[];
+    extensions?: string[];
+  };
+
+  /** Documentation: https://esbuild.github.io/api/#public-path */
+  publicPath?: string;
+
+  /** Documentation: https://esbuild.github.io/api/#banner */
+  inject?: Array<{
+    position: "start" | "end";
+    target: "entry" | "chunk" | "all";
+    content: string;
+    extensions: string[];
+  }>;
+}
+
+type BuildResult = {
+  manifest: object;
+  results: Record<string, Buffer>;
+};
+
+declare class Bundler {
+  constructor(options: BundlerOptions);
+  build: (options: BuildOptions) => Promise<BuildResult>;
+  buildSync: (options: BuildOptions) => BuildResult;
+  handle: (
+    req: Request,
+    options: { prefix?: string }, // prefix to remove from req.url
+  ) => Promise<FileBlob | null>;
+  rebuild(): Promise<void>;
+}
+
+const bundler = new Bundler({}).build({
+  entrypoints: ["index.js"],
+  write: process.cwd() + "/build",
+});