Implement `bun init` subcommand

12 files changed, 676 insertions, 20 deletions

diff --git a/README.md b/README.md
index bb35cb7ce..060096bed 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,6 @@ All in one fast & easy-to-use tool. Instead of 1,000 node_modules for develo
 
 **bun is experimental software**. Join [bun’s Discord](https://bun.sh/discord) for help and have a look at [things that don’t work yet](#not-implemented-yet).
 
-
 Today, bun's primary focus is bun.js: bun's JavaScript runtime.
 
 ## Install
@@ -98,6 +97,7 @@ If using Linux, kernel version 5.6 or higher is strongly recommended, but the mi
     - [Testing your new template](#testing-your-new-template)
     - [Config](#config)
     - [How `bun create` works](#how-bun-create-works)
+  - [`bun init`](#bun-init)
   - [`bun bun`](#bun-bun)
     - [Why bundle?](#why-bundle)
     - [What is `.bun`?](#what-is-bun)
@@ -1586,7 +1586,7 @@ bun is distributed as a single binary file, so you can also do this manually:
 
 ### Canary builds
 
-[Canary](https://github.com/oven-sh/bun/releases/tag/canary) builds are generated on every commit. At the time of writing, only Linux x64 & Linux arm64 are generated.
+[Canary](https://github.com/oven-sh/bun/releases/tag/canary) builds are generated on every commit.
 
 To install a [canary](https://github.com/oven-sh/bun/releases/tag/canary) build of bun, run:
 
@@ -1604,6 +1604,29 @@ To revert to the latest published version of bun, run:
 bun upgrade
 ```
 
+### `bun init`
+
+`bun init` is a quick way to start a blank project with Bun. It guesses with sane defaults and is non-destructive when run multiple times.
+
+![Demo](https://user-images.githubusercontent.com/709451/182999974-926a67d6-c03e-4311-8b0a-4ebebf0b4884.gif)
+
+It creates:
+
+- a `package.json` file with a name that defaults to the current directory name
+- a `tsconfig.json` file or a `jsconfig.json` file, depending if the entry point is a TypeScript file or not
+- an entry point which defaults to `index.ts` unless any of `index.{tsx, jsx, js, mts, mjs}` exist or the `package.json` specifies a `module` or `main` field
+- a `README.md` file
+
+If you pass `-y` or `--yes`, it will assume you want to continue without asking questions.
+
+At the end, it runs `bun install` to install `bun-types`.
+
+Added in Bun v0.1.7.
+
+#### How is `bun init` different than `bun create`?
+
+`bun init` is for blank projects. `bun create` applies templates.
+
 ### `bun completions`
 
 This command installs completions for `zsh` and/or `fish`. It runs automatically on every `bun upgrade` and on install. It reads from `$SHELL` to determine which shell to install for. It tries several common shell completion directories for your shell and OS.
diff --git a/completions/bun.bash b/completions/bun.bash
index 057ffc725..bba078366 100644
--- a/completions/bun.bash
+++ b/completions/bun.bash
@@ -82,7 +82,7 @@ _bun_completions() {
     declare -A GLOBAL_OPTIONS;
     declare -A PACKAGE_OPTIONS;
 
-    local SUBCOMMANDS="dev bun create run install add remove upgrade completions discord help";
+    local SUBCOMMANDS="dev bun create run install add remove upgrade completions discord help init";
 
     GLOBAL_OPTIONS[LONG_OPTIONS]="--use --cwd --bunfile --server-bunfile --config --disable-react-fast-refresh --disable-hmr --extension-order --jsx-factory --jsx-fragment --extension-order --jsx-factory --jsx-fragment --jsx-import-source --jsx-production --jsx-runtime --main-fields --no-summary --version --platform --public-dir --tsconfig-override --define --external --help --inject --loader --origin --port --dump-environment-variables --dump-limits --disable-bun-js";
     GLOBAL_OPTIONS[SHORT_OPTIONS]="-c -v -d -e -h -i -l -u -p";
diff --git a/completions/bun.fish b/completions/bun.fish
index db2ac60a6..60bb21361 100644
--- a/completions/bun.fish
+++ b/completions/bun.fish
@@ -53,14 +53,14 @@ end
 set -l bun_install_boolean_flags yarn production optional development no-save dry-run force no-cache silent verbose global
 set -l bun_install_boolean_flags_descriptions "Write a yarn.lock file (yarn v1)" "Don't install devDependencies" "Add dependency to optionalDependencies" "Add dependency to devDependencies" "Don't install devDependencies" "Don't install anything" "Always request the latest versions from the registry & reinstall all dependenices" "Ignore manifest cache entirely" "Don't output anything" "Excessively verbose logging" "Use global folder"
 
-set -l bun_builtin_cmds dev create help bun upgrade discord run install remove add
-set -l bun_builtin_cmds_without_run dev create help bun upgrade discord install remove add
-set -l bun_builtin_cmds_without_bun dev create help upgrade run discord install remove add
-set -l bun_builtin_cmds_without_create dev help bun upgrade discord run install remove add
-set -l bun_builtin_cmds_without_install create dev help bun upgrade discord run remove add
-set -l bun_builtin_cmds_without_remove create dev help bun upgrade discord run install add
-set -l bun_builtin_cmds_without_add create dev help bun upgrade discord run remove install
-set -l bun_builtin_cmds_without_pm create dev help bun upgrade discord run
+set -l bun_builtin_cmds dev create help bun upgrade discord run install remove add init
+set -l bun_builtin_cmds_without_run dev create help bun upgrade discord install remove add init
+set -l bun_builtin_cmds_without_bun dev create help upgrade run discord install remove add init
+set -l bun_builtin_cmds_without_create dev help bun upgrade discord run install remove add init
+set -l bun_builtin_cmds_without_install create dev help bun upgrade discord run remove add init
+set -l bun_builtin_cmds_without_remove create dev help bun upgrade discord run install add init
+set -l bun_builtin_cmds_without_add create dev help bun upgrade discord run remove install init
+set -l bun_builtin_cmds_without_pm create dev help bun upgrade discord run init
 
 complete -c bun \
 	-n "not __fish_seen_subcommand_from $bun_builtin_cmds_without_run; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts); and __fish_use_subcommand" -a '(__fish__get_bun_scripts)' -d 'script'
@@ -85,7 +85,7 @@ complete -c bun \
 complete -c bun \
 	-n "bun_fish_is_nth_token 1; and not __fish_seen_subcommand_from $bun_builtin_cmds; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts) and __fish_use_subcommand" -a 'dev' -d 'Start dev server'
 complete -c bun \
-	-n "bun_fish_is_nth_token 1; and not __fish_seen_subcommand_from $bun_builtin_cmds; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts) and __bun_command_count 1 and __fish_use_subcommand" -a 'create' -f -d 'Create a new project' 
+	-n "bun_fish_is_nth_token 1; and not __fish_seen_subcommand_from $bun_builtin_cmds; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts) and __bun_command_count 1 and __fish_use_subcommand" -a 'create' -f -d 'Create a new project from a template' 
 
 complete -c bun \
 	-n "not __fish_seen_subcommand_from $bun_builtin_cmds_without_create next react; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts); and __fish_seen_subcommand_from create;" -a 'next' -d 'new Next.js project'
@@ -115,6 +115,8 @@ complete -c bun \
 	-n "not __fish_seen_subcommand_from $bun_builtin_cmds_without_create; and not __fish_seen_subcommand_from (__fish__get_bun_bins); and not __fish_seen_subcommand_from (__fish__get_bun_scripts); and __fish_seen_subcommand_from react; or __fish_seen_subcommand_from next" -F -d "Create in directory"
 
 
+complete -c bun \
+	-n "bun_fish_is_nth_token 1; and not __fish_seen_subcommand_from $bun_builtin_cmds; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts) and __bun_command_count 1 and __fish_use_subcommand" -a 'init' -F -d 'Start an empty Bun project' 
 
 complete -c bun \
 	-n "bun_fish_is_nth_token 1; and not __fish_seen_subcommand_from $bun_builtin_cmds; and not __fish_seen_subcommand_from (__fish__get_bun_bins) (__fish__get_bun_scripts) and __bun_command_count 1 and __fish_use_subcommand" -a 'install' -f -d 'Install packages from package.json' 
diff --git a/completions/bun.zsh b/completions/bun.zsh
index 91becac35..af2c89e4a 100644
--- a/completions/bun.zsh
+++ b/completions/bun.zsh
@@ -1,10 +1,10 @@
 _bun() {
     zstyle ':completion:*:*:bun:*' group-name ''
     zstyle ':completion:*:*:bun-grouped:*' group-name ''
-    
+
     zstyle ':completion:*:*:bun::descriptions' format '%F{green}-- %d --%f'
     zstyle ':completion:*:*:bun-grouped:*' format '%F{green}-- %d --%f'
-    
+
     local program=bun
     typeset -A opt_args
     local curcontext="$curcontext" state line context
@@ -90,6 +90,15 @@ _bun() {
             esac
 
             ;;
+        init)
+            # ---- Command: init
+            _arguments -s -C \
+                '1: :->cmd' \
+                '-y[Answer yes to all prompts]' \
+                '--yes[Answer yes to all prompts]' &&
+                ret=0
+
+            ;;
         create)
 
             # ---- Command: create
diff --git a/src/cli.zig b/src/cli.zig
index e849d258f..5dc954be9 100644
--- a/src/cli.zig
+++ b/src/cli.zig
@@ -645,9 +645,8 @@ const AutoCommand = struct {
         try HelpCommand.execWithReason(allocator, .invalid_command);
     }
 };
-const InitCommand = struct {
-    pub fn exec(_: std.mem.Allocator) !void {}
-};
+const InitCommand = @import("./cli/init_command.zig").InitCommand;
+
 pub const HelpCommand = struct {
     pub fn exec(allocator: std.mem.Allocator) !void {
         @setCold(true);
@@ -909,7 +908,7 @@ pub const Command = struct {
         switch (tag) {
             .DiscordCommand => return try DiscordCommand.exec(allocator),
             .HelpCommand => return try HelpCommand.exec(allocator),
-            .InitCommand => return try InitCommand.exec(allocator),
+            .InitCommand => return try InitCommand.exec(allocator, std.os.argv),
             else => {},
         }
 
diff --git a/src/cli/README-for-init.md b/src/cli/README-for-init.md
new file mode 100644
index 000000000..7a0dced5d
--- /dev/null
+++ b/src/cli/README-for-init.md
@@ -0,0 +1,15 @@
+# {[name]s}
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run {[entryPoint]s}
+```
+
+This project was created using `bun init` in bun v{[bunVersion]any}. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
diff --git a/src/cli/gitignore-for-init b/src/cli/gitignore-for-init
new file mode 100644
index 000000000..f81d56eaa
--- /dev/null
+++ b/src/cli/gitignore-for-init
@@ -0,0 +1,169 @@
+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+\*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+\*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+\*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+\*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.cache
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+.cache/
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+.cache
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.\*
diff --git a/src/cli/init_command.zig b/src/cli/init_command.zig
new file mode 100644
index 000000000..fe5164110
--- /dev/null
+++ b/src/cli/init_command.zig
@@ -0,0 +1,402 @@
+const bun = @import("../global.zig");
+const string = bun.string;
+const Output = bun.Output;
+const Global = bun.Global;
+const Environment = bun.Environment;
+const strings = bun.strings;
+const MutableString = bun.MutableString;
+const stringZ = bun.stringZ;
+const default_allocator = bun.default_allocator;
+const C = bun.C;
+const std = @import("std");
+const open = @import("../open.zig");
+const CLI = @import("../cli.zig");
+const Fs = @import("../fs.zig");
+const ParseJSON = @import("../json_parser.zig").ParseJSONUTF8;
+const js_parser = @import("../js_parser.zig");
+const js_ast = @import("../js_ast.zig");
+const linker = @import("../linker.zig");
+const options = @import("../options.zig");
+const initializeStore = @import("./create_command.zig").initializeStore;
+const lex = @import("../js_lexer.zig");
+const logger = @import("../logger.zig");
+const JSPrinter = @import("../js_printer.zig");
+
+fn exists(path: anytype) bool {
+    if (@TypeOf(path) == [:0]const u8 or @TypeOf(path) == [:0]u8) {
+        if (std.os.accessZ(path, 0)) {
+            return true;
+        } else |_| {
+            return false;
+        }
+    } else {
+        if (std.os.access(path, 0)) {
+            return true;
+        } else |_| {
+            return false;
+        }
+    }
+}
+pub const InitCommand = struct {
+    fn prompt(
+        alloc: std.mem.Allocator,
+        comptime label: string,
+        default: []const u8,
+        _: bool,
+    ) ![]const u8 {
+        Output.pretty(label, .{});
+        if (default.len > 0) {
+            Output.pretty("<d>({s}):<r> ", .{default});
+        }
+
+        Output.flush();
+
+        const input = try std.io.getStdIn().reader().readUntilDelimiterAlloc(alloc, '\n', 1024);
+        if (input.len > 0) {
+            return input;
+        } else {
+            return default;
+        }
+    }
+
+    const default_gitignore = @embedFile("gitignore-for-init");
+    const default_tsconfig = @embedFile("tsconfig-for-init.json");
+    const README = @embedFile("README-for-init.md");
+
+    // TODO: unicode case folding
+    fn normalizePackageName(allocator: std.mem.Allocator, input: []const u8) ![]const u8 {
+        // toLowerCase
+        const needs_normalize = brk: {
+            for (input) |c| {
+                if ((c >= 'A' and c <= 'Z') or c == ' ' or c == '"' or c == '\'') {
+                    break :brk true;
+                }
+            }
+            break :brk false;
+        };
+
+        if (!needs_normalize) {
+            return input;
+        }
+
+        var new = try allocator.alloc(u8, input.len);
+        for (new) |c, i| {
+            if (c >= 'A' and c <= 'Z') {
+                new[i] = c + ('a' - 'A');
+            } else if (c == ' ' or c == '"' or c == '\'') {
+                new[i] = '-';
+            } else {
+                new[i] = c;
+            }
+        }
+
+        return new;
+    }
+
+    const PackageJSONFields = struct {
+        name: string = "project",
+        @"type": string = "module",
+        object: *js_ast.E.Object = undefined,
+        entry_point: string = "",
+    };
+
+    pub fn exec(alloc: std.mem.Allocator, argv: [][*:0]u8) !void {
+        var fs = try Fs.FileSystem.init1(alloc, null);
+        const pathname = Fs.PathName.init(fs.topLevelDirWithoutTrailingSlash());
+        const destination_dir = std.fs.cwd();
+
+        var fields = PackageJSONFields{};
+
+        var package_json_file = destination_dir.openFile("package.json", .{ .mode = .read_write }) catch null;
+        var package_json_contents: MutableString = MutableString.initEmpty(alloc);
+        initializeStore();
+        read_package_json: {
+            if (package_json_file) |pkg| {
+                const stat = pkg.stat() catch break :read_package_json;
+
+                if (stat.kind != .File or stat.size == 0) {
+                    break :read_package_json;
+                }
+                package_json_contents = try MutableString.init(alloc, stat.size);
+                package_json_contents.list.expandToCapacity();
+
+                _ = pkg.preadAll(package_json_contents.list.items, 0) catch {
+                    package_json_file = null;
+                    break :read_package_json;
+                };
+            }
+        }
+
+        fields.name = brk: {
+            if (normalizePackageName(alloc, if (pathname.filename.len > 0) pathname.filename else "")) |name| {
+                if (name.len > 0) {
+                    break :brk name;
+                }
+            } else |_| {}
+
+            break :brk "project";
+        };
+        var did_load_package_json = false;
+        if (package_json_contents.list.items.len > 0) {
+            process_package_json: {
+                var source = logger.Source.initPathString("package.json", package_json_contents.list.items);
+                var log = logger.Log.init(alloc);
+                var package_json_expr = ParseJSON(&source, &log, alloc) catch {
+                    package_json_file = null;
+                    break :process_package_json;
+                };
+
+                if (package_json_expr.data != .e_object) {
+                    package_json_file = null;
+                    break :process_package_json;
+                }
+
+                fields.object = package_json_expr.data.e_object;
+
+                if (package_json_expr.get("name")) |name| {
+                    if (name.asString(alloc)) |str| {
+                        fields.name = str;
+                    }
+                }
+
+                if (package_json_expr.get("module") orelse package_json_expr.get("main")) |name| {
+                    if (name.asString(alloc)) |str| {
+                        fields.entry_point = str;
+                    }
+                }
+
+                did_load_package_json = true;
+            }
+        }
+
+        if (fields.entry_point.len == 0) {
+            infer: {
+                const paths_to_try = [_][:0]const u8{
+                    @as([:0]const u8, "index.mts"),
+                    @as([:0]const u8, "index.tsx"),
+                    @as([:0]const u8, "index.ts"),
+                    @as([:0]const u8, "index.jsx"),
+                    @as([:0]const u8, "index.mjs"),
+                    @as([:0]const u8, "index.js"),
+                };
+
+                for (paths_to_try) |path| {
+                    if (exists(path)) {
+                        fields.entry_point = std.mem.span(path);
+                        break :infer;
+                    }
+                }
+
+                fields.entry_point = "index.ts";
+            }
+        }
+
+        if (!did_load_package_json) {
+            fields.object = js_ast.Expr.init(
+                js_ast.E.Object,
+                .{},
+                logger.Loc.Empty,
+            ).data.e_object;
+        }
+
+        const auto_yes = brk: {
+            for (argv) |arg_| {
+                const arg = bun.span(arg_);
+                if (strings.eqlComptime(arg, "-y") or strings.eqlComptime(arg, "--yes")) {
+                    break :brk true;
+                }
+            }
+            break :brk false;
+        };
+
+        if (!auto_yes) {
+            Output.prettyln("<r><b>bun init<r> helps you get started with a minimal project and tries to guess sensible defaults. <d>Press ^C anytime to quit<r>\n\n", .{});
+            Output.flush();
+
+            fields.name = try normalizePackageName(alloc, try prompt(
+                alloc,
+                "<r><cyan>package name<r> ",
+                fields.name,
+                Output.enable_ansi_colors_stdout,
+            ));
+            fields.entry_point = try prompt(
+                alloc,
+                "<r><cyan>entry point<r> ",
+                fields.entry_point,
+                Output.enable_ansi_colors_stdout,
+            );
+            try Output.writer().writeAll("\n");
+            Output.flush();
+        }
+
+        const Steps = struct {
+            write_gitignore: bool = true,
+            write_package_json: bool = true,
+            write_tsconfig: bool = true,
+            write_readme: bool = true,
+        };
+
+        var steps = Steps{};
+
+        steps.write_gitignore = brk: {
+            if (exists(".gitignore")) {
+                break :brk false;
+            }
+
+            break :brk true;
+        };
+
+        steps.write_readme = !exists("README.md") and !exists("README") and !exists("README.txt") and !exists("README.mdx");
+
+        steps.write_tsconfig = brk: {
+            if (exists("tsconfig.json")) {
+                break :brk false;
+            }
+
+            if (exists("jsconfig.json")) {
+                break :brk false;
+            }
+
+            break :brk true;
+        };
+
+        {
+            try fields.object.putString(alloc, "name", fields.name);
+            if (fields.entry_point.len > 0) {
+                if (fields.object.hasProperty("module")) {
+                    try fields.object.putString(alloc, "module", fields.entry_point);
+                    try fields.object.putString(alloc, "type", "module");
+                } else if (fields.object.hasProperty("main")) {
+                    try fields.object.putString(alloc, "main", fields.entry_point);
+                } else {
+                    try fields.object.putString(alloc, "module", fields.entry_point);
+                    try fields.object.putString(alloc, "type", "module");
+                }
+            }
+
+            const needs_dev_dependencies = brk: {
+                if (fields.object.get("devDependencies")) |deps| {
+                    if (deps.hasAnyPropertyNamed(&.{"bun-types"})) {
+                        break :brk false;
+                    }
+                }
+
+                break :brk true;
+            };
+
+            if (needs_dev_dependencies) {
+                var dev_dependencies = fields.object.get("devDependencies") orelse js_ast.Expr.init(js_ast.E.Object, js_ast.E.Object{}, logger.Loc.Empty);
+                const version = comptime brk: {
+                    var base = Global.version;
+                    base.patch = 0;
+                    break :brk base;
+                };
+
+                try dev_dependencies.data.e_object.putString(alloc, "bun-types", comptime std.fmt.comptimePrint("^{any}", .{version.fmt("")}));
+                try fields.object.put(alloc, "devDependencies", dev_dependencies);
+            }
+        }
+
+        write_package_json: {
+            if (package_json_file == null) {
+                package_json_file = try std.fs.cwd().createFileZ("package.json", .{});
+            }
+            var package_json_writer = JSPrinter.NewFileWriter(package_json_file.?);
+
+            const written = JSPrinter.printJSON(
+                @TypeOf(package_json_writer),
+                package_json_writer,
+                js_ast.Expr{ .data = .{ .e_object = fields.object }, .loc = logger.Loc.Empty },
+                &logger.Source.initEmptyFile("package.json"),
+            ) catch |err| {
+                Output.prettyErrorln("package.json failed to write due to error {s}", .{@errorName(err)});
+                package_json_file = null;
+                break :write_package_json;
+            };
+
+            std.os.ftruncate(package_json_file.?.handle, written + 1) catch {};
+            package_json_file.?.close();
+        }
+
+        if (package_json_file != null) {
+            Output.prettyln("<r><green>Done!<r> A package.json file was saved in the current directory.", .{});
+        }
+
+        if (fields.entry_point.len > 0 and !exists(fields.entry_point)) {
+            var entry = try std.fs.cwd().createFile(fields.entry_point, .{ .truncate = true });
+            entry.writeAll("console.log(\"Hello via Bun!\");") catch {};
+            entry.close();
+            Output.prettyln(" + <r><d>{s}<r>", .{fields.entry_point});
+            Output.flush();
+        }
+
+        if (steps.write_gitignore) {
+            brk: {
+                var file = std.fs.cwd().createFileZ(".gitignore", .{ .truncate = true }) catch break :brk;
+                defer file.close();
+                file.writeAll(default_gitignore) catch break :brk;
+                Output.prettyln(" + <r><d>.gitignore<r>", .{});
+                Output.flush();
+            }
+        }
+
+        if (steps.write_tsconfig) {
+            brk: {
+                const extname = std.fs.path.extension(fields.entry_point);
+                const loader = options.defaultLoaders.get(extname) orelse options.Loader.ts;
+                const filename = if (loader.isTypeScript())
+                    "tsconfig.json"
+                else
+                    "jsconfig.json";
+                var file = std.fs.cwd().createFileZ(filename, .{ .truncate = true }) catch break :brk;
+                defer file.close();
+                file.writeAll(default_tsconfig) catch break :brk;
+                Output.prettyln(" + <r><d>{s}<r><d> (for editor auto-complete)<r>", .{filename});
+                Output.flush();
+            }
+        }
+
+        if (steps.write_readme) {
+            brk: {
+                const filename = "README.md";
+                var file = std.fs.cwd().createFileZ(filename, .{ .truncate = true }) catch break :brk;
+                defer file.close();
+                file.writer().print(README, .{
+                    .name = fields.name,
+                    .bunVersion = Global.version.fmt(""),
+                    .entryPoint = fields.entry_point,
+                }) catch break :brk;
+                Output.prettyln(" + <r><d>{s}<r>", .{filename});
+                Output.flush();
+            }
+        }
+
+        if (fields.entry_point.len > 0) {
+            Output.prettyln("\nTo get started, run:", .{});
+            if (strings.containsAny(
+                " \"'",
+                fields.entry_point,
+            )) {
+                Output.prettyln("  <r><cyan>bun run {any}<r>", .{JSPrinter.formatJSONString(fields.entry_point)});
+            } else {
+                Output.prettyln("  <r><cyan>bun run {s}<r>", .{fields.entry_point});
+            }
+        }
+
+        Output.flush();
+
+        if (exists("package.json")) {
+            var process = std.ChildProcess.init(
+                &.{
+                    try std.fs.selfExePathAlloc(alloc),
+                    "install",
+                },
+                alloc,
+            );
+            process.stderr_behavior = .Pipe;
+            process.stdin_behavior = .Pipe;
+            process.stdout_behavior = .Pipe;
+            _ = try process.spawnAndWait();
+        }
+    }
+};
diff --git a/src/cli/tsconfig-for-init.json b/src/cli/tsconfig-for-init.json
new file mode 100644
index 000000000..feee4b584
--- /dev/null
+++ b/src/cli/tsconfig-for-init.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "module": "esnext",
+    "target": "esnext",
+    "moduleResolution": "node",
+
+    // so that if your project isn't using TypeScript, it still has autocomplete
+    "allowJs": true,
+
+    // "bun-types" is the important part
+    "types": ["bun-types"]
+  }
+}
diff --git a/src/fs.zig b/src/fs.zig
index 78888dcd4..e54c7e0e6 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -93,6 +93,14 @@ pub const FileSystem = struct {
 
     threadlocal var tmpdir_handle: ?std.fs.Dir = null;
 
+    pub fn topLevelDirWithoutTrailingSlash(this: *const FileSystem) []const u8 {
+        if (this.top_level_dir.len > 1 and this.top_level_dir[this.top_level_dir.len - 1] == std.fs.path.sep) {
+            return this.top_level_dir[0 .. this.top_level_dir.len - 1];
+        } else {
+            return this.top_level_dir;
+        }
+    }
+
     pub fn tmpdir(fs: *FileSystem) std.fs.Dir {
         if (tmpdir_handle == null) {
             tmpdir_handle = fs.fs.openTmpDir() catch unreachable;
diff --git a/src/js_ast.zig b/src/js_ast.zig
index eb28091c9..aa53efadd 100644
--- a/src/js_ast.zig
+++ b/src/js_ast.zig
@@ -1335,6 +1335,21 @@ pub const E = struct {
             return if (asProperty(self, key)) |query| query.expr else @as(?Expr, null);
         }
 
+        pub fn put(self: *Object, allocator: std.mem.Allocator, key: string, expr: Expr) !void {
+            if (asProperty(self, key)) |query| {
+                self.properties.ptr[query.i].value = expr;
+            } else {
+                try self.properties.push(allocator, .{
+                    .key = Expr.init(E.String, E.String.init(key), expr.loc),
+                    .value = expr,
+                });
+            }
+        }
+
+        pub fn putString(self: *Object, allocator: std.mem.Allocator, key: string, value: string) !void {
+            return try put(self, allocator, key, Expr.init(E.String, E.String.init(value), logger.Loc.Empty));
+        }
+
         pub const SetError = error{ OutOfMemory, Clobber };
 
         pub fn set(self: *const Object, key: Expr, allocator: std.mem.Allocator, value: Expr) SetError!void {
@@ -1502,7 +1517,7 @@ pub const E = struct {
             for (obj.properties.slice()) |prop| {
                 const key = prop.key orelse continue;
                 if (std.meta.activeTag(key.data) != .e_string) continue;
-                if (key.eql(string, name)) return true;
+                if (key.data.e_string.eql(string, name)) return true;
             }
             return false;
         }
diff --git a/src/string_immutable.zig b/src/string_immutable.zig
index 3a2bf4fc1..4d856b966 100644
--- a/src/string_immutable.zig
+++ b/src/string_immutable.zig
@@ -78,7 +78,7 @@ pub inline fn containsComptime(self: string, comptime str: string) bool {
 pub const includes = contains;
 
 pub inline fn containsAny(in: anytype, target: string) bool {
-    for (in) |str| if (contains(bun.span(str), target)) return true;
+    for (in) |str| if (contains(if (@TypeOf(str) == u8) &[1]u8{str} else bun.span(str), target)) return true;
     return false;
 }