Little doc

README.md

@@ -304,7 +304,54 @@ Longer-term, bun intends to replace Node.js, Webpack, Babel, and PostCSS (in pro
 
 ### bunfig.toml
 
-TODO: document this
+bunfig.toml is bun's configuration file.
+
+It lets you load configuration from a file instead of passing flags to the CLI each time. The config file is loaded before CLI arguments are parsed, which means CLI arguments can override them.
+
+Here is an example:
+
+```toml
+# Set a default framework to use
+# By default, bun will look for an npm package like `bun-framework-${framework}`, followed by `${framework}`
+framework = "next"
+logLevel = "debug"
+
+# publicDir = "public"
+# external = ["jquery"]
+
+[macros]
+# Remap any import like this:
+#     import {graphql} from 'react-relay';
+# To:
+#     import {graphql} from 'macro:bun-macro-relay';
+react-relay = { "graphql" = "bun-macro-relay" }
+
+[bundle]
+saveTo = "node_modules.bun"
+# Don't need this if `framework` is set, but showing it here as an example anyway
+entryPoints = ["./app/index.ts"]
+
+[bundle.packages]
+# If you're bundling packages that do not actually live in a `node_modules` folder or do not have the full package name in the file path, you can pass this to bundle them anyway
+"@bigapp/design-system" = true
+
+[dev]
+# Change the default port from 3000 to 5000
+port = 5000
+
+[define]
+# Replace any usage of "process.env.bagel" with the string `lox`.
+# The values are parsed as JSON, except single-quoted strings are supported and `'undefined'` becomes `undefined` in JS.
+# This will probably change in a future release to be just regular TOML instead. It is a holdover from the CLI argument parsing.
+"process.env.bagel" = "'lox'"
+
+[loaders]
+# When loading a .bagel file, run the JS parser
+".bagel" = "js"
+
+```
+
+TODO: list each property name
 
 ### Loaders
 
@@ -322,6 +369,7 @@ Currently, bun implements the following loaders:
 | .cjs  | JavaScript                    | .js    |
 | .mts  | TypeScript                    | .js    |
 | .cts  | TypeScript                    | .js    |
+| .toml | TOML                          | .js    |
 | .css  | CSS                           | .css   |
 | .env  | Env                           | N/A    |
 | .\*   | file                          | string |

src/bunfig.zig

@@ -96,14 +96,6 @@ pub const Bunfig = struct {
                             this.bunfig.port = 3000;
                         }
                     }
-
-                    if (expr.get("port")) |port| {
-                        try this.expect(port, .e_number);
-                        this.bunfig.port = port.data.e_number.toU16();
-                        if (this.bunfig.port.? == 0) {
-                            this.bunfig.port = 3000;
-                        }
-                    }
                 }
             }