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node_modules/assert-never/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.assertNever = assertNever;
+/**
+ * Helper function for exhaustive checks of discriminated unions.
+ * https://basarat.gitbooks.io/typescript/docs/types/discriminated-unions.html
+ *
+ * @example
+ *
+ *    type A = {type: 'a'};
+ *    type B = {type: 'b'};
+ *    type Union = A | B;
+ *
+ *    function doSomething(arg: Union) {
+ *      if (arg.type === 'a') {
+ *        return something;
+ *      }
+ *
+ *      if (arg.type === 'b') {
+ *        return somethingElse;
+ *      }
+ *
+ *      // TS will error if there are other types in the union
+ *      // Will throw an Error when called at runtime.
+ *      // Use `assertNever(arg, true)` instead to fail silently.
+ *      return assertNever(arg);
+ *    }
+ */
+function assertNever(value, errorMessageOrNoThrow) {
+    if (typeof errorMessageOrNoThrow === 'string') {
+        throw new Error(errorMessageOrNoThrow);
+    }
+    if (typeof errorMessageOrNoThrow === 'function') {
+        throw new Error(errorMessageOrNoThrow(value));
+    }
+    if (errorMessageOrNoThrow) {
+        return value;
+    }
+    throw new Error("Unhandled discriminated union member: ".concat(JSON.stringify(value)));
+}
+exports.default = assertNever;