Create type for err-code (#45504)

* feat: err-code

* feat(err-code): handle null correctly

* feat(err-code): add minimum ts requirement

types/err-code/err-code-tests.ts

@@ -0,0 +1,55 @@
+import errCode = require('err-code');
+
+// test create without code
+const err1 = errCode(new Error('err msg'), {
+    prop1: 'prop1 value',
+    prop2: {
+        a: 'prop2.a value',
+    }
+});
+
+const err1Message = err1.message;
+const err1MProp1 = err1.prop1;
+const err1MProp2a = err1.prop2.a;
+
+// test create with code
+const err2 = errCode(new Error('err msg'), 'Bad Request', {
+    prop1: 'prop1 value',
+    prop2: {
+        a: 'prop2.a value',
+    }
+});
+
+const err2Message = err2.message;
+const err2MProp1 = err2.prop1;
+const err2MProp2a = err2.prop2.a;
+const err2Code = err2.code;
+
+// test adding type constraint
+const err3 = errCode<{
+    prop1: string
+    prop2: {
+        a: string
+    }
+}>(new Error('err msg'), {
+    prop1: 'prop1 value',
+    prop2: {
+        a: 'prop2.a value',
+    }
+});
+
+const err3Message = err3.message;
+const err3MProp1 = err3.prop1;
+const err3MProp2a = err3.prop2.a;
+
+// test null code
+const err4 = errCode(new Error('err msg'), null, {
+    prop1: 'prop1 value',
+    prop2: {
+        a: 'prop2.a value',
+    }
+});
+
+const err4Message = err4.message;
+const err4MProp1 = err4.prop1;
+const err4MProp2a = err4.prop2.a;

types/err-code/index.d.ts

@@ -0,0 +1,24 @@
+// Type definitions for err-code 2.0
+// Project: https://github.com/IndigoUnited/js-err-code#readme
+// Definitions by: George <https://github.com/zorji>
+//                 Cayman <https://github.com/wemeetagain>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// Minimum TypeScript Version: 3.2
+
+type Scalar = number | string | boolean | bigint | null | undefined;
+
+declare function createError<Props extends object = object, Err extends Error = Error>(
+    error: Err,
+    props?: Props,
+): Err & Props;
+
+declare function createError<Code extends Scalar = Scalar, Props extends object = object, Err extends Error = Error>(
+    error: Err,
+    code: Code,
+    props?: Props,
+): Err & Props & { code: NonNullable<Code> };
+
+declare namespace createError {
+}
+
+export = createError;

types/err-code/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "err-code-tests.ts"
+    ]
+}

types/err-code/tslint.json

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