fix #2337: add support for font file MIME types

Author: evanw

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## Unreleased
+
+* Add support for font file MIME types ([#2337](https://github.com/evanw/esbuild/issues/2337))
+
+    This release adds support for font file MIME types to esbuild, which means they are now recognized by the built-in local web server and they are now used when a font file is loaded using the `dataurl` loader. The full set of newly-added file extension MIME type mappings is as follows:
+
+    * `.eot` => `application/vnd.ms-fontobject`
+    * `.otf` => `font/otf`
+    * `.sfnt` => `font/sfnt`
+    * `.ttf` => `font/ttf`
+    * `.woff` => `font/woff`
+    * `.woff2` => `font/woff2`
+
 ## 0.14.47
 
 * Make global names more compact when `||=` is available ([#2331](https://github.com/evanw/esbuild/issues/2331))

internal/bundler/bundler_loader_test.go

@@ -960,6 +960,86 @@ func TestLoaderDataURLUnknownMIME(t *testing.T) {
 	})
 }
 
+func TestLoaderDataURLExtensionBasedMIME(t *testing.T) {
+	default_suite.expectBundled(t, bundled{
+		files: map[string]string{
+			"/entry.foo": `
+				export { default as css }   from "./example.css"
+				export { default as eot }   from "./example.eot"
+				export { default as gif }   from "./example.gif"
+				export { default as htm }   from "./example.htm"
+				export { default as html }  from "./example.html"
+				export { default as jpeg }  from "./example.jpeg"
+				export { default as jpg }   from "./example.jpg"
+				export { default as js }    from "./example.js"
+				export { default as json }  from "./example.json"
+				export { default as mjs }   from "./example.mjs"
+				export { default as otf }   from "./example.otf"
+				export { default as pdf }   from "./example.pdf"
+				export { default as png }   from "./example.png"
+				export { default as sfnt }  from "./example.sfnt"
+				export { default as svg }   from "./example.svg"
+				export { default as ttf }   from "./example.ttf"
+				export { default as wasm }  from "./example.wasm"
+				export { default as webp }  from "./example.webp"
+				export { default as woff }  from "./example.woff"
+				export { default as woff2 } from "./example.woff2"
+				export { default as xml }   from "./example.xml"
+			`,
+			"/example.css":   `css`,
+			"/example.eot":   `eot`,
+			"/example.gif":   `gif`,
+			"/example.htm":   `htm`,
+			"/example.html":  `html`,
+			"/example.jpeg":  `jpeg`,
+			"/example.jpg":   `jpg`,
+			"/example.js":    `js`,
+			"/example.json":  `json`,
+			"/example.mjs":   `mjs`,
+			"/example.otf":   `otf`,
+			"/example.pdf":   `pdf`,
+			"/example.png":   `png`,
+			"/example.sfnt":  `sfnt`,
+			"/example.svg":   `svg`,
+			"/example.ttf":   `ttf`,
+			"/example.wasm":  `wasm`,
+			"/example.webp":  `webp`,
+			"/example.woff":  `woff`,
+			"/example.woff2": `woff2`,
+			"/example.xml":   `xml`,
+		},
+		entryPaths: []string{"/entry.foo"},
+		options: config.Options{
+			Mode:         config.ModeBundle,
+			AbsOutputDir: "/out",
+			ExtensionToLoader: map[string]config.Loader{
+				".foo":   config.LoaderJS,
+				".css":   config.LoaderDataURL,
+				".eot":   config.LoaderDataURL,
+				".gif":   config.LoaderDataURL,
+				".htm":   config.LoaderDataURL,
+				".html":  config.LoaderDataURL,
+				".jpeg":  config.LoaderDataURL,
+				".jpg":   config.LoaderDataURL,
+				".js":    config.LoaderDataURL,
+				".json":  config.LoaderDataURL,
+				".mjs":   config.LoaderDataURL,
+				".otf":   config.LoaderDataURL,
+				".pdf":   config.LoaderDataURL,
+				".png":   config.LoaderDataURL,
+				".sfnt":  config.LoaderDataURL,
+				".svg":   config.LoaderDataURL,
+				".ttf":   config.LoaderDataURL,
+				".wasm":  config.LoaderDataURL,
+				".webp":  config.LoaderDataURL,
+				".woff":  config.LoaderDataURL,
+				".woff2": config.LoaderDataURL,
+				".xml":   config.LoaderDataURL,
+			},
+		},
+	})
+}
+
 func TestLoaderCopyWithBundleFromJS(t *testing.T) {
 	default_suite.expectBundled(t, bundled{
 		files: map[string]string{

internal/bundler/snapshots/snapshots_default.txt

@@ -1967,6 +1967,95 @@ console.log([
   json_charset_UTF_8_base64_eyJ3b3JrcyI6dHJ1ZX0_default
 ]);
 
+================================================================================
+TestLoaderDataURLExtensionBasedMIME
+---------- /out/entry.js ----------
+// example.css
+var example_default = "data:text/css;charset=utf-8;base64,Y3Nz";
+
+// example.eot
+var example_default2 = "data:application/vnd.ms-fontobject;base64,ZW90";
+
+// example.gif
+var example_default3 = "data:image/gif;base64,Z2lm";
+
+// example.htm
+var example_default4 = "data:text/html;charset=utf-8;base64,aHRt";
+
+// example.html
+var example_default5 = "data:text/html;charset=utf-8;base64,aHRtbA==";
+
+// example.jpeg
+var example_default6 = "data:image/jpeg;base64,anBlZw==";
+
+// example.jpg
+var example_default7 = "data:image/jpeg;base64,anBn";
+
+// example.js
+var example_default8 = "data:text/javascript;charset=utf-8;base64,anM=";
+
+// example.json
+var example_default9 = "data:application/json;base64,anNvbg==";
+
+// example.mjs
+var example_default10 = "data:text/javascript;charset=utf-8;base64,bWpz";
+
+// example.otf
+var example_default11 = "data:font/otf;base64,b3Rm";
+
+// example.pdf
+var example_default12 = "data:application/pdf;base64,cGRm";
+
+// example.png
+var example_default13 = "data:image/png;base64,cG5n";
+
+// example.sfnt
+var example_default14 = "data:font/sfnt;base64,c2ZudA==";
+
+// example.svg
+var example_default15 = "data:image/svg+xml;base64,c3Zn";
+
+// example.ttf
+var example_default16 = "data:font/ttf;base64,dHRm";
+
+// example.wasm
+var example_default17 = "data:application/wasm;base64,d2FzbQ==";
+
+// example.webp
+var example_default18 = "data:image/webp;base64,d2VicA==";
+
+// example.woff
+var example_default19 = "data:font/woff;base64,d29mZg==";
+
+// example.woff2
+var example_default20 = "data:font/woff2;base64,d29mZjI=";
+
+// example.xml
+var example_default21 = "data:text/xml;charset=utf-8;base64,eG1s";
+export {
+  example_default as css,
+  example_default2 as eot,
+  example_default3 as gif,
+  example_default4 as htm,
+  example_default5 as html,
+  example_default6 as jpeg,
+  example_default7 as jpg,
+  example_default8 as js,
+  example_default9 as json,
+  example_default10 as mjs,
+  example_default11 as otf,
+  example_default12 as pdf,
+  example_default13 as png,
+  example_default14 as sfnt,
+  example_default15 as svg,
+  example_default16 as ttf,
+  example_default17 as wasm,
+  example_default18 as webp,
+  example_default19 as woff,
+  example_default20 as woff2,
+  example_default21 as xml
+};
+
 ================================================================================
 TestLoaderDataURLTextCSS
 ---------- /out/entry.css ----------

internal/helpers/mime.go

@@ -3,21 +3,34 @@ package helpers
 import "strings"
 
 var builtinTypesLower = map[string]string{
+	// Text
 	".css":  "text/css; charset=utf-8",
-	".gif":  "image/gif",
 	".htm":  "text/html; charset=utf-8",
 	".html": "text/html; charset=utf-8",
-	".jpeg": "image/jpeg",
-	".jpg":  "image/jpeg",
 	".js":   "text/javascript; charset=utf-8",
 	".json": "application/json",
 	".mjs":  "text/javascript; charset=utf-8",
-	".pdf":  "application/pdf",
+	".xml":  "text/xml; charset=utf-8",
+
+	// Images
+	".gif":  "image/gif",
+	".jpeg": "image/jpeg",
+	".jpg":  "image/jpeg",
 	".png":  "image/png",
 	".svg":  "image/svg+xml",
-	".wasm": "application/wasm",
 	".webp": "image/webp",
-	".xml":  "text/xml; charset=utf-8",
+
+	// Fonts
+	".eot":   "application/vnd.ms-fontobject",
+	".otf":   "font/otf",
+	".sfnt":  "font/sfnt",
+	".ttf":   "font/ttf",
+	".woff":  "font/woff",
+	".woff2": "font/woff2",
+
+	// Other
+	".pdf":  "application/pdf",
+	".wasm": "application/wasm",
 }
 
 // This is used instead of Go's built-in "mime.TypeByExtension" function because