Add definitions for smshelper (#42061)

types/smshelper/index.d.ts

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+// Type definitions for smshelper 0.1
+// Project: https://github.com/jaygel179/smshelper.js#readme
+// Definitions by: André Matthies <https://github.com/matthiez>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function count(text: string): number;
+
+export function detectEncoding(text: string): 'GSM_7BIT' | 'GSM_7BIT_EX' | 'UTF16';
+
+export function parts(text: string): number;

types/smshelper/smshelper-tests.ts

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+import * as smshelper from 'smshelper';
+
+const charCount = smshelper.count('MY_RANDOM_MESSAGE');
+
+const encoding = smshelper.detectEncoding('MY_RANDOM_MESSAGE');
+
+const smsCount = smshelper.parts('MY_RANDOM_MESSAGE');

types/smshelper/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
+    },
+    "files": [
+        "index.d.ts",
+        "smshelper-tests.ts"
+    ]
+}

types/smshelper/tslint.json

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