[media-typer] add typings (#18945)

types/media-typer/index.d.ts

@@ -0,0 +1,13 @@
+// Type definitions for media-typer 0.3
+// Project: https://github.com/jshttp/media-typer
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function parse(mediaType: string): MediaType;
+export function format(mediaTypeDescriptor: MediaType): string;
+
+export interface MediaType {
+    type: string;
+    subtype: string;
+    suffix?: string;
+}

types/media-typer/media-typer-tests.ts

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+import * as typer from 'media-typer';
+
+const obj = typer.parse('image/svg+xml');
+// $ExpectType MediaType
+obj;
+// $ExpectType string
+obj.type;
+// $ExpectType string
+obj.subtype;
+// $ExpectType string | undefined
+obj.suffix;
+
+// $ExpectType string
+typer.format({type: 'image', subtype: 'svg', suffix: 'xml'});
+typer.format({type: 'image', subtype: 'svg'});

types/media-typer/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "media-typer-tests.ts"
+    ]
+}

types/media-typer/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }