{"id":41347198,"url":"https://github.com/nuxodin/item.js","last_synced_at":"2026-02-27T16:17:04.001Z","repository":{"id":44546745,"uuid":"457092146","full_name":"nuxodin/item.js","owner":"nuxodin","description":"Observable datastructures","archived":false,"fork":false,"pushed_at":"2026-01-02T20:56:47.000Z","size":219,"stargazers_count":3,"open_issues_count":1,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2026-01-09T10:53:31.956Z","etag":null,"topics":["crazy","datastructures","effect","observable","reactive","signal"],"latest_commit_sha":null,"homepage":"","language":"JavaScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/nuxodin.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2022-02-08T20:26:31.000Z","updated_at":"2026-01-02T20:56:52.000Z","dependencies_parsed_at":"2023-02-17T07:10:26.576Z","dependency_job_id":"51e90ca9-94e2-4eca-9c7e-5bb5763d44ec","html_url":"https://github.com/nuxodin/item.js","commit_stats":{"total_commits":125,"total_committers":2,"mean_commits":62.5,"dds":"0.016000000000000014","last_synced_commit":"7d661ce94f015f3f74f542ee914e5d6cf4a1a84b"},"previous_names":[],"tags_count":7,"template":false,"template_full_name":null,"purl":"pkg:github/nuxodin/item.js","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/nuxodin%2Fitem.js","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/nuxodin%2Fitem.js/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/nuxodin%2Fitem.js/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/nuxodin%2Fitem.js/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/nuxodin","download_url":"https://codeload.github.com/nuxodin/item.js/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/nuxodin%2Fitem.js/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28682358,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-23T05:48:07.525Z","status":"ssl_error","status_checked_at":"2026-01-23T05:48:07.129Z","response_time":59,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["crazy","datastructures","effect","observable","reactive","signal"],"created_at":"2026-01-23T07:09:10.021Z","updated_at":"2026-02-27T16:17:03.988Z","avatar_url":"https://github.com/nuxodin.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# item.js\n\n**A primitive abstraction layer for reactive data structures**\n\n## The Problem\n\nEvery data source has its own API: Files use `fs.readFile()`, localStorage uses\n`getItem()`, databases use SQL queries, MQTT uses pub/sub. This means:\n\n- 🔄 Different APIs for every backend\n- 🎯 No unified reactivity\n- 🔗 Hard to switch or combine data sources\n- 🧩 Complex integration code\n\n## The Solution\n\n`item.js` provides **one uniform API** for all structured data sources.\n\n```js\n// Same API, different backends:\nfileSystem.item(\"project\").item(\"readme.md\").value = \"### Hello World\";\ndbItem.item(\"users\").item(\"123\").item(\"name\").value = \"Alice\";\nmqttItem.item(\"sensors\").item(\"temp\").value = 23.5;\nlocalStorage.item(\"theme\").value = \"dark\";\n```\n\n## Installation\n\n```js\nimport { item } from \"https://cdn.jsdelivr.net/gh/nuxodin/item.js@0.4.0/item.js\"\n```\n\n## Wrapped value\n\n```js\nconst a = item(1);\na.value === 1; // true\n\n// using object\nconst a = item({ b: 1 });\na.value; // {b: 1}\nconst b = a.item(\"b\"); // property 'b' is also an \"Item\"\nb.parent === a;\nb.key === \"b\";\nb.path; // ['b'];\na.sub([\"a\", \"b\", \"c\"]); // equals b.item('a').item('b').item('c');\na.item(\"c\").item(\"d\"); // Automatic property creation (Autovivification)\n```\n\n## Promise handling\n\n`item.js` supports assigning promises directly with automatic state tracking.\n\n```js\nconst i = item();\ni.promise = Promise.resolve(42);\ni.value === undefined;\ni.pending === true; // while pending\ni.promise; // returns assigned promise or Promise.resolve(this.value)\nawait i.promise; // 42\ni.value === 42; // resolved value\n```\n\n### Properties\n\n- **`pending`**: `true` while promise is pending\n- **`error`**: Error object on rejection, `undefined` otherwise\n- **`filled`**: `true` after successful resolution\n\n### Behavior\n\n- On rejection: previous value is preserved, error is stored\n- Change events / effects: fire after resolution or rejection\n- Error clearing: automatic when new promise is set or resolves successfully\n\n## Effect\n\n```js\n// effect\neffect(() =\u003e {\n    console.log(a.item(\"b\").value);\n    console.log(b.item(\"c\").value);\n});\na.item(\"b\").value = 2;\nb.item(\"c\").value = 3;\n// triggers effect batched after a microtask\n```\n\n## Events\n\n```js\na.addEventListener(\"change\", ({ detail }) =\u003e {\n    console.log(detail.oldValue, detail.value);\n});\na.value = 3; // triggers 'change' event\n\na.addEventListener(\"get\", ({ detail }) =\u003e {\n    console.log(detail.value);\n});\na.value; // triggers 'get' event\n\n// bubbling (changeIn)\na.addEventListener(\"changeIn\", ({ detail }) =\u003e {\n    detail.item === a.item(\"b\"); // true\n    console.log(detail.item, detail.oldValue, detail.value);\n});\na.item(\"b\").value = 2; // triggers 'changeIn' event on 'a' (bubbles up)\n\n// object-related:\na.addEventListener(\"changeIn\", (event) =\u003e {\n    if (detail.add) {\n        console.log(event.target, \"added property\", event.detail.add); // child-item\n    }\n    if (detail.remove) {\n        console.log(event.target, \"removed property\", event.detail.remove);\n    }\n});\n```\n\n## Proxy\n\n```js\nconst p = item({ a: 1 }).proxy;\np.a === 1; // equals `i.item('a').value === 1`\np.a = 2;\n```\n\n## Extend from Item\n\n```js\nimport { Item } from \"../item.js\";\n\nclass UpperCaseItem extends Item {\n    $get() { // overwrite getter\n        const value = super.$get();\n        return typeof value === \"string\" ? value.toUpperCase() : value;\n    }\n}\n\n// Ussage:\nconst a = new UpperCaseItem();\na.value = { a: \"Hello\", b: \"World\" };\nconsole.log(a.value); // {a: 'HELLO', b: 'WORLD'}\n```\n\n## See how easy it is to use \"item.js\" with different drivers\n\n```js\n// indexeddb\nimport {IDB} from \"../drivers/indexedDb.js\";\nconst db = IDB().item('db');\ndb.open(2, { upgrade(db, oldVersion, newVersion, transaction) { ... } });\n\ndb.item('store').item('1').item('name').value = 'demo';\n\n// MySQL\nimport {Mysql} from \"../drivers/sql/Mysql.js\";\nconst db = new Mysql({host: 'localhost'}).item('db');\nawait db.connect();\n\ndb.item('table').item('1').item('name').value = 'demo';\n\n// MQTT\nimport {mqtt} from \"../drivers/mqtt.js\";\nconst root = await mqtt({url: 'mqtt://mqtt.org:1883'});\n\nroot.item('house1').item('counters').item('electricity').value = 876;\n\n// localStorage\nimport {getStore} from \"../drivers/localStorage.js\";\nconst store = getStore('demo');\n\nstore.item('someItem').value = 'Hello World';\n\n// cookies\nimport {cookies} from \"../drivers/cookies.js\";\nconst root = cookies();\n\nroot.item('myCookie').value = 'Hello World';\n```\n\nEven easier with proxies:\n\n```js\nconst db = dbItem.proxy;\n\ndb.myTable[1] = { name: \"demo\", age: 42 };\n\n// and react to changes\neffect(() =\u003e {\n    input.value = mqtt.house1.counters.electricity;\n});\n```\n\n## About\n\n- MIT License, Copyright (c) 2022 \u003cu1\u003e (like all repositories in this\n  organization) \u003cbr\u003e\n- Suggestions, ideas, finding bugs and making pull requests make us very happy.\n  ♥\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnuxodin%2Fitem.js","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnuxodin%2Fitem.js","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnuxodin%2Fitem.js/lists"}