feat: add unleash server provider

.github/component_owners.yml

@@ -30,6 +30,8 @@ components:
     - markphelps
   libs/providers/flipt-web:
     - markphelps
+  libs/providers/unleash:
+    - albertilagan
   libs/providers/unleash-web:
     - jarebudev
 

.release-please-manifest.json

@@ -20,5 +20,6 @@
   "libs/providers/config-cat-web": "0.1.5",
   "libs/shared/config-cat-core": "0.1.1",
   "libs/providers/unleash-web": "0.1.1",
-  "libs/providers/growthbook": "0.1.2"
+  "libs/providers/growthbook": "0.1.2",
+  "libs/providers/unleash": "0.1.0"
 }

libs/providers/unleash/.eslintrc.json

@@ -0,0 +1,30 @@
+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts", "*.tsx", "*.js", "*.jsx"],
+      "rules": {}
+    },
+    {
+      "files": ["*.ts", "*.tsx"],
+      "rules": {}
+    },
+    {
+      "files": ["*.js", "*.jsx"],
+      "rules": {}
+    },
+    {
+      "files": ["*.json"],
+      "parser": "jsonc-eslint-parser",
+      "rules": {
+        "@nx/dependency-checks": [
+          "error",
+          {
+            "ignoredFiles": ["{projectRoot}/eslint.config.{js,cjs,mjs}"]
+          }
+        ]
+      }
+    }
+  ]
+}

libs/providers/unleash/README.md

@@ -0,0 +1,81 @@
+# unleash Provider
+
+## About this provider
+
+This provider is a community-developed implementation for Unleash which uses the official [Node Server-side SDK](https://docs.getunleash.io/reference/sdks/node).
+
+### Concepts
+
+- Boolean evaluation gets feature enabled status.
+- String, Number, and Object evaluation gets feature variant value.
+- Object evaluation should be used for JSON/CSV payloads in variants.
+
+## Installation
+
+```shell
+$ npm install @openfeature/unleash-provider @openfeature/server-sdk
+```
+
+## Usage
+
+To initialize the OpenFeature client with Unleash, you can use the following code snippets:
+
+### Initialization
+
+```ts
+import { UnleashProvider } from '@openfeature/unleash-provider';
+
+const provider = new UnleashProvider({
+  url: 'https://YOUR-API-URL',
+  appName: 'your app',
+  customHeaders: { Authorization: 'your api key' },
+});
+
+await OpenFeature.setProviderAndWait(provider);
+```
+
+### Available Constructor Configuration Options
+
+Unleash has a variety of configuration options that can be provided to the `UnleashProvider` constructor.
+
+Please refer to the options described in the official [Node Server-side SDK](https://docs.getunleash.io/reference/sdks/node).
+
+### After initialization
+
+After the provider gets initialized, you can start evaluations of feature flags like so:
+
+```ts
+// Get the client
+const client = await OpenFeature.getClient();
+
+// You can now use the client to evaluate your flags
+const details = client.getBooleanValue('my-feature', false);
+```
+
+The static evaluation context can be changed if needed
+
+```ts
+const evaluationCtx: EvaluationContext = {
+  usedId: 'theuser',
+  currentTime: 'time',
+  sessionId: 'theSessionId',
+  remoteAddress: 'theRemoteAddress',
+  environment: 'theEnvironment',
+  appName: 'theAppName',
+  aCustomProperty: 'itsValue',
+  anotherCustomProperty: 'somethingForIt',
+};
+
+// changes the static evaluation context for OpenFeature
+await OpenFeature.setContext(evaluationCtx);
+```
+
+## Contribute
+
+### Building
+
+Run `nx package providers-unleash` to build the library.
+
+### Running unit tests
+
+Run `nx test providers-unleash` to execute the unit tests via [Jest](https://jestjs.io).

libs/providers/unleash/babel.config.json

@@ -0,0 +1,3 @@
+{
+  "presets": [["minify", { "builtIns": false }]]
+}

libs/providers/unleash/jest.config.ts

@@ -0,0 +1,9 @@
+export default {
+  displayName: 'providers-unleash',
+  preset: '../../../jest.preset.js',
+  transform: {
+    '^.+\\.[tj]s$': ['ts-jest', { tsconfig: '<rootDir>/tsconfig.spec.json' }],
+  },
+  moduleFileExtensions: ['ts', 'js', 'html'],
+  coverageDirectory: '../../../coverage/libs/providers/unleash-web',
+};