Add Typescript declarations for couchimport (#177)

* Add initial types for app.js

* Consolidate types into index.d.ts

* Add more specific types for delimiters

* Add return type for stream import

* Rename callback types

* Remove auto-generated declaration file

* Add EOL newline

* Add types to package.json

package.json

@@ -29,6 +29,7 @@
     "standard": "^14.3.1"
   },
   "main": "./app.js",
+  "types": "./types/index.d.ts",
   "bin": {
     "couchimport": "bin/couchimport.bin.js",
     "couchexport": "bin/couchexport.bin.js"

types/index.d.ts

@@ -0,0 +1,50 @@
+import { Options } from 'csv-parse';
+import { Stream, Transform } from 'stream';
+
+declare module couchimport {
+    type Delimiter = '?' | '\t' | ',';
+
+    type ImportCallback = (err: Error, data: { total: number, totalFailed: number }) => void;
+    type ExportCallback = (err: Error, data: never) => void;
+    type UrlPreviewCallback = (err: Error, data: any, delimiter: Delimiter) => void;
+    type StreamPreviewCallback = (err: Error, data: any, delimiter: Delimiter) => void;
+
+    export interface Config {
+        url?: string;
+        database?: string;
+        delimiter?: Options['delimiter'];
+        type?: 'json' | 'jsonl' | 'text';
+        buffer?: number;
+        jsonpath?: string;
+        transform?: (data: any, meta: {}) => any;
+        meta?: {};
+        parallelism?: number;
+        preview?: boolean;
+        ignorefields?: string[];
+        overwrite?: boolean;
+    }
+
+    function importStream(rs: Stream, callback: ImportCallback): Transform;
+    function importStream(rs: Stream, opts: Config, callback: ImportCallback): Transform;
+
+    function importFile(filename: string, callback: ImportCallback): Transform;
+    function importFile(filename: string, opts: Config, callback: ImportCallback): Transform;
+
+    function exportStream(ws: Stream, callback: ExportCallback): void;
+    function exportStream(ws: Stream, opts: Config, callback: ExportCallback): void;
+
+    function exportFile(filename: string, callback: ExportCallback): void;
+    function exportFile(filename: string, opts: Config, callback: ExportCallback): void;
+
+    function previewURL(u: string, opts: never, callback: UrlPreviewCallback): void;
+
+    function previewStream(rs: Stream, callback: StreamPreviewCallback): void;
+    function previewStream(rs: Stream, opts: Config, callback: StreamPreviewCallback): void;
+
+    function previewCSVFile(filename: string, callback: StreamPreviewCallback): void;
+    function previewCSVFile(filename: string, opts: Config, callback: StreamPreviewCallback): void;
+}
+
+declare module "couchimport" {
+    export = couchimport;
+}