First spike at incrementing algorithm

Author: danielrbradley

.gitignore

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+
+# Created by https://www.toptal.com/developers/gitignore/api/node,yarn,windows,linux,macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=node,yarn,windows,linux,macos
+
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+
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+# End of https://www.toptal.com/developers/gitignore/api/node,yarn,windows,linux,macos

.nvmrc

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+v14.15.0

index.d.ts

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+/** @name Schedule
+ *  @description Any field which is not defined or empty is assumed to be unconstrained.
+ */
+export declare type Schedule = {
+    second?: number[];
+    minute?: number[];
+    hour?: number[];
+    dayOfMonth?: number[];
+    month?: number[];
+    dayOfWeek?: number[];
+    year?: number[];
+};
+export declare const next: (schedule: Schedule | string, from: Date) => Date | undefined;