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dot-store\n\nEasy to use store and event emitter — async, immutable, self-documenting, highly extensible\n\n![pale blue dot](https://qph.fs.quoracdn.net/main-qimg-347d2c178e6bf511ee5b91e8276c79fa)\n\n\u003c!-- START doctoc generated TOC please keep comment here to allow auto update --\u003e\n\u003c!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --\u003e\n\n- [Install](#install)\n- [Using the store](#using-the-store)\n  - [Set values (immutably)](#set-values-immutably)\n  - [Get values](#get-values)\n  - [Subscribe to changes](#subscribe-to-changes)\n- [Store operations](#store-operations)\n- [Store subscribers](#store-subscribers)\n  - [Order of operation](#order-of-operation)\n  - [Subscriber options](#subscriber-options)\n  - [Dynamic subscribers](#dynamic-subscribers)\n  - [Check if prop value changed](#check-if-prop-value-changed)\n  - [Unsubscribe](#unsubscribe)\n- [Custom operations](#custom-operations)\n- [Extensions](#extensions)\n\n\u003c!-- END doctoc generated TOC please keep comment here to allow auto update --\u003e\n\n## Install\n\n```bash\nnpm install --save dot-store\n```\n\n## Using the store\n\n```js\nimport Store from \"dot-store\"\nconst store = new Store()\n```\n\nPass an object to the `Store` constructor to set a default state.\n\n### Set values (immutably)\n\n```js\nawait store.set(\"users.bob.admin\", true)\n```\n\n### Get values\n\n```js\nstore.get(\"users.bob.admin\") // true\nstore.get() // {users: {bob: {admin: true}}}\n```\n\n### Subscribe to changes\n\nThis subscriber responds to any change within `users.bob`:\n\n```js\nstore.on(\"users.bob\", async () =\u003e {\n  console.log(\"bob changed\")\n})\n```\n\n## Store operations\n\n| Operation             | Async | Description                           |\n| :-------------------- | :---- | :------------------------------------ |\n| `get(props)`          | no    | Read prop value                       |\n| `delete(props)`       | yes   | Delete prop value                     |\n| `merge(props, value)` | yes   | Merge prop value with array or object |\n| `set(props, value)`   | yes   | Set prop value                        |\n| `time(props)`         | yes   | Set prop value to current timestamp   |\n| `toggle(props)`       | yes   | Toggle boolean prop value             |\n\n## Store subscribers\n\nSubscriber functions like `store.on(event, props, fn)` allow you to subscribe to any change within the prop location.\n\n| Subscriber                     | Timing                                                                       |\n| :----------------------------- | :--------------------------------------------------------------------------- |\n| `on(event, props, fn)`         | Subscribe to prop value change                                               |\n| `once(event, props, fn)`       | Subscribe to a single prop value change                                      |\n| `onceExists(event, props, fn)` | Subscribe to a single prop value change and immediately emit if value exists |\n\nThe `event` string consists of a preposition (`before` or `after`), plus an operation. For example, a valid `event` string would be `beforeSet` or `afterDelete`.\n\nThe `after` preposition is used by default when it is not specified. You may also use `update` in place of the operation to subscribe to all updates.\n\nWhen omitted entirely, the `event` parameter defaults to `\"afterUpdate\"`.\n\n### Order of operation\n\n1. Call operation function (e.g. `store.set(props, value)`)\n2. Execute all `before` subscribers and wait for them to resolve\n3. Perform operation on store\n4. Execute all `after` subscribers and wait for them to resolve\n5. Operation function resolves\n\n### Subscriber options\n\nSubscribers receive an options argument with lots of useful stuff:\n\n```js\nstore.on(\n  \"users.bob\",\n  async ({\n    change,\n    event,\n    prevState,\n    state,\n    store,\n    subscriber,\n  }) =\u003e {\n    // see example values below\n  }\n)\n\nawait store.set(\"users.bob.admin\", true)\n```\n\n| Argument               | Example value                   | Description             |\n| :--------------------- | :------------------------------ | :---------------------- |\n| `change.prevValue`     | `undefined`                     | Pre-op change value     |\n| `change.props`         | `\"users.bob.admin\"`             | Change props            |\n| `change.propKeys`      | `[\"users\", \"bob\", \"admin\"]`     | Change prop keys        |\n| `change.test(props)`   | `\u003cFunction\u003e`                    | Test for change @ prop  |\n| `change.value`         | `true`                          | Change value            |\n| `event.prep`           | `\"after\"`                       | Event preposition       |\n| `event.op`             | `\"set\"`                         | Event operation         |\n| `prevState`            | `{}`                            | Pre-op state            |\n| `state`                | `{users: {bob: {admin: true}}}` | Current state           |\n| `store`                | `\u003cDotStore\u003e`                    | Store instance          |\n| `subscriber.prevValue` | `undefined`                     | Pre-op subscriber value |\n| `subscriber.props`     | `\"users.bob\"`                   | Subscriber props        |\n| `subscriber.propKeys`  | `[\"users\", \"bob\"]`              | Subscriber prop keys    |\n| `subscriber.value`     | `{admin: true}`                 | Subscriber value        |\n\n### Dynamic subscribers\n\nUse curly braces around a prop key to capture its value:\n\n```js\nstore.on(\"users.{userId}\", async ({ userId }) =\u003e {\n  userId // \"bob\", then \"ted\"\n})\n\nawait store.set(\"users.bob.admin\", true)\nawait store.set(\"users.ted.admin\", true)\n```\n\n### Check if prop value changed\n\nThe `change.test(props)` function tests if a prop value changed.\n\nThe return value is truthy and doubles as a way to retrieve prop keys:\n\n```js\nstore.on(\"users\", async ({ change }) =\u003e {\n  // ✓ Value did change\n  change.test(\"users.{userId}.{attr}\") // { userId: \"bob\", attr: \"admin\" }\n  change.test(\"users.bob.admin\") // {}\n  change.test(\"users.bob\") // {}\n  change.test(\"users\") // {}\n\n  // ⃠ Value didn't change\n  change.test(\"users.ted.{attr}\") // false\n  change.test(\"users.ted\") // false\n})\n\nawait store.set(\"users.bob.admin\", true)\n```\n\n### Unsubscribe\n\n```js\nconst off = store.on(\"users.bob\", async () =\u003e {})\noff()\n```\n\n## Custom operations\n\nCustom operations do not modify the store. 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