[slice-source] Add type definitions (#47690)

* [slice-source] Add type definitions

* Remove empty file

* Revert "Remove empty file"

This reverts commit 7365af4ede01c3bc51a27a20792a4ec3156c9d20.

* Fix lint

types/slice-source/index.d.ts

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+// Type definitions for slice-source 0.4
+// Project: https://github.com/mbostock/slice-source
+// Definitions by: Björn Harrtell <https://github.com/bjornharrtell>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function slice(source: ReadableStream | ReadableStreamReader | SliceSource): SliceSource;
+
+interface SliceChunk {
+    value: Uint8Array;
+    done: boolean;
+}
+
+interface SliceSource {
+    slice(length: number): Promise<Uint8Array>;
+    read(): Promise<SliceChunk>;
+    cancel(): Promise<void>;
+}
+
+export = slice;

types/slice-source/slice-source-tests.ts

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+import slice = require('slice-source');

types/slice-source/tsconfig.json

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

types/slice-source/tslint.json

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+{ "extends": "dtslint/dt.json" }