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chore: Update implementation and move to github actions. (#7)
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‎.circleci/config.yml‎

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‎.github/workflows/ci.yml‎

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name: Verify Hello App
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on:
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schedule:
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# * is a special character in YAML so you have to quote this string
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- cron: '0 9 * * *'
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push:
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branches: [ main, 'feat/**' ]
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paths-ignore:
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- '**.md' # Do not need to run CI for markdown changes.
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pull_request:
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branches: [ main, 'feat/**' ]
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paths-ignore:
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- '**.md'
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jobs:
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build-and-run:
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runs-on: ubuntu-latest
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permissions:
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id-token: write # Needed if using OIDC to get release secrets.
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steps:
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- uses: actions/checkout@v4
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- uses: actions/setup-node@v4
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- run: npm i
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- uses: launchdarkly/gh-actions/actions/verify-hello-app@verify-hello-app-v2.0.1
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with:
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use_server_key: true
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role_arn: ${{ vars.AWS_ROLE_ARN }}
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command: npm start

‎index.ts‎

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import * as LaunchDarkly from '@launchdarkly/node-server-sdk';
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// Set sdkKey to your LaunchDarkly SDK key.
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const sdkKey = "";
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const sdkKey = process.env.LAUNCHDARKLY_SDK_KEY ?? 'your-sdk-key';
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// Set featureFlagKey to the feature flag key you want to evaluate.
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const featureFlagKey = "my-boolean-flag";
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const featureFlagKey = process.env.LAUNCHDARKLY_FLAG_KEY ?? 'sample-feature';
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// Set up the context properties. This use should appear on your LaunchDarkly
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// contexts dashboard soon after you run the demo.
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function showBanner() {
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console.log(
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` ██
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██
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████████
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███████
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██ LAUNCHDARKLY █
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███████
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████████
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██
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██
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`,
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);
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}
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function printValueAndBanner(flagValue: boolean) {
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console.log(`*** The '${featureFlagKey}' feature flag evaluates to ${flagValue}.`);
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if (flagValue) showBanner();
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}
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if (!sdkKey) {
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console.log('*** Please edit index.js to set sdkKey to your LaunchDarkly SDK key first.');
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process.exit(1);
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}
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const ldClient = LaunchDarkly.init(sdkKey);
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// Set up the context properties. This context should appear on your LaunchDarkly contexts dashboard
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// soon after you run the demo.
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const context = {
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"kind": "user",
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"name": "Sandy",
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"key": "example-context-key"
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kind: 'user',
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key: 'example-user-key',
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name: 'Sandy',
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};
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function showMessage(s: string) {
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console.log("*** " + s);
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console.log("");
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}
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async function main() {
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try {
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await ldClient.waitForInitialization({timeout: 10});
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const client = LaunchDarkly.init(sdkKey);
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client.once('ready', function () {
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showMessage("SDK successfully initialized!");
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client.variation(featureFlagKey, context, false, function (err, showFeature) {
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client.track("event-called", context);
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if (showFeature) {
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// application code to show the feature
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showMessage("Feature flag '" + featureFlagKey + "' is true for this context");
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} else {
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// the code to run if the feature is off
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showMessage("Feature flag '" + featureFlagKey + "' is false for this context");
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}
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console.log('*** SDK successfully initialized!');
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// Here we ensure that the SDK shuts down cleanly and has a chance to deliver analytics
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// events to LaunchDarkly before the program exits. If analytics events are not delivered,
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// the context properties and flag usage statistics will not appear on your dashboard. In a
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// normal long-running application, the SDK would continue running and events would be
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// delivered automatically in the background.
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client.flush(function () {
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client.close();
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const eventKey = `update:${featureFlagKey}`;
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ldClient.on(eventKey, async () => {
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const flagValue = await ldClient.variation(featureFlagKey, context, false);
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printValueAndBanner(flagValue);
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});
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});
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});
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const flagValue = await ldClient.variation(featureFlagKey, context, false);
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printValueAndBanner(flagValue);
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if (typeof process.env.CI !== "undefined") {
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process.exit(0);
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}
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} catch (error) {
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console.log(`*** SDK failed to initialize: ${error}`);
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process.exit(1);
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}
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}
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main();

‎package.json‎

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"author": "LaunchDarkly <team@launchdarkly.com>",
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"license": "Apache-2.0",
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"devDependencies": {
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"@types/node": "20.4.2",
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"ts-node": "10.9.1",
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"typescript": "5.1.6"
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"@types/node": "22.10.1",
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"ts-node": "10.9.2",
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"typescript": "5.7.2"
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},
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"dependencies": {
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"@launchdarkly/node-server-sdk": ">= 8.0.0"
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"@launchdarkly/node-server-sdk": ">= 9.0.0"
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}
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}

‎tsconfig.json‎

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{
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"compilerOptions": {
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"module": "commonjs",
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"strict": true
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"module": "NodeNext",
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"strict": true,
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"target": "ES2020",
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"moduleResolution": "NodeNext",
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}
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}
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}

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