[ffmpeg-concat] Create type definition (#43945)

* Create ffmpeg-concat type definition

* Export syntax

* Transition.params is optional

types/ffmpeg-concat/ffmpeg-concat-tests.ts

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+import concat from 'ffmpeg-concat';
+
+concat({
+    audio: '',
+    cleanupFrames: true,
+    concurrency: 4,
+    frameFormat: 'raw',
+    log: () => {},
+    output: '',
+    tempDir: '',
+    transition: {
+        duration: 100,
+        name: '',
+        params: { direction: [1, -1] },
+    },
+    transitions: [
+        {
+            duration: 100,
+            name: '',
+            params: { direction: [1, -1] },
+        },
+        {
+            duration: 100,
+            name: '',
+            params: { direction: [1, -1] },
+        },
+    ],
+    videos: ['', ''],
+});

types/ffmpeg-concat/index.d.ts

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+// Type definitions for ffmpeg-concat 1.1
+// Project: https://github.com/transitive-bullshit/ffmpeg-concat
+// Definitions by: Weslen Nascimento <https://github.com/weslenng>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface Transition {
+    duration: number;
+    name: string;
+    params?: any;
+}
+
+interface ConcatOptions {
+    audio?: string;
+    cleanupFrames?: boolean;
+    concurrency?: number;
+    frameFormat?: 'jpg' | 'png' | 'raw';
+    log?: (stdout: string) => void;
+    output: string;
+    tempDir?: string;
+    transition?: Transition;
+    transitions?: ReadonlyArray<Transition>;
+    videos: ReadonlyArray<string>;
+}
+
+declare function concat(concatOptions: ConcatOptions): Promise<void>;
+
+export = concat;

types/ffmpeg-concat/tsconfig.json

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

types/ffmpeg-concat/tslint.json

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