harper-build-and-deploy

name

harper-build-and-deploy

description

This skill should be used when building, running locally, or deploying a Harper (HarperDB/Fabric) component — running harper dev/run, producing the generated resources.js and web/** from TypeScript via the project build, packaging the harper-app component, deploying to Harper Fabric, or handling deploy-time secrets. Use it for any change that affects the deployable surface or the dev loop. Pairs with harper-component-model, harper-config-yaml, and harper-resources.

Harper Build and Deploy

Overview

The Harper lifecycle is: develop locally → build TypeScript into the deployable component → run/iterate → deploy to Fabric. This skill covers the CLI, the project's build step, and the deploy surface so a change is provably finished, not just compiling.

Local dev and run (the CLI)

The CLI binary is harper (v5; older installs use harperdb). Key commands:

Command	What it does
harper dev <path/to/app>	Dev mode: watches files, single-threaded, auto-restarts worker threads on change, with console logging. The fast iteration loop. Does not restart the main thread.
harper run <path/to/app>	Run an app from any directory. Use when you need the main thread to (re)start; manage start/stop yourself.
harper start / stop / restart	Background (daemon) lifecycle.
harper status	Harper and clustering status.
harper get_components	List installed components.

In this project, dev typically runs against the component dir, e.g. harper dev harper-app (use the project's documented run command if it wraps this).

The build step (TypeScript -> generated artifacts)

Harper loads JavaScript (resources.js) and serves static files (web/**). In this project those are generated, not authored.

What the build actually does:

1. Compiles the TypeScript source under src/ into deployable JavaScript.
2. Emits harper-app/resources.js, the aggregate resource module loaded by the jsResource extension.
3. Emits per-resource modules such as harper-app/resource-*.js when the project build splits resources for Harper's runtime loader.
4. Copies browser/static output into harper-app/web/** for the static extension to serve.
5. Mirrors shared library output into harper-app/lib/** and rewrites imports such as ../lib/foo.js to ./lib/foo.js. Fabric packages the component root as a flat deploy unit, and Node resolves real paths at runtime, so imports must point at files that exist inside the packaged harper-app/ root.
6. Adds cache-busting ?v= query parameters to browser-module imports when the project build owns web asset versioning.

Generated Harper deploy artifacts usually include:

• harper-app/resources.js
• harper-app/resource-*.js
• harper-app/web/**
• harper-app/lib/**

Every lint, format, dead-code, search, or generated-artifact guard must ignore those generated paths unless it is explicitly validating the build output itself. When a new generated path appears, add it to every relevant ignore surface in the same change; partial ignores fail later gates in non-obvious ways.

• TypeScript under src/ is source. bun run build produces the deployable Harper assets from it.
• Never edit generated Harper assets directly — change the TypeScript and rebuild. See [[harper-resources]] and [[harper-component-model]].
• Build before symlinking, packaging, or deploying harper-app/. Deploying stale artifacts ships code that does not match src/.

The deployable surface

A deployable Harper component must keep these at the component root Fabric packages:

• config.yaml — active extensions ([[harper-config-yaml]])
• schema.graphql — data model ([[harper-schema-graphql]])
• resources.js — generated custom logic
• web/** — generated static assets

If a change touches this surface, it is not done until the local build and the relevant deployed or smoke path agree.

Deploying to Fabric

Fabric is Harper's distributed deploy network. Lisa ships a create-only GitHub Actions workflow at .github/workflows/deploy.yml for Harper/Fabric projects. Use that workflow as the canonical deployment path for repositories that have adopted the template: it builds the project, runs harper deploy_component against the configured Fabric target, and then runs the project's smoke verification script.

Required GitHub secrets:

• CLI_TARGET or HARPER_FABRIC_TARGET — Fabric target URL.
• CLI_TARGET_USERNAME — deploy username.
• CLI_TARGET_PASSWORD — deploy password.

Optional GitHub variables:

• HARPER_PROJECT — Fabric project name; defaults to the repository name.
• HARPER_PACKAGE — package path; defaults to harper-app.

For local debugging or one-off deploys, the equivalent CLI command packages the component and sends it to a target instance:

harper deploy_component \
  project=<app-name> \
  package=<path-or-git-url> \
  target=https://<instance>:9925 \
  username=<user> \
  password=<pass> \
  restart=true \
  replicated=true

• Omitting package deploys the current directory.
• restart=true restarts threads after deploy so new code loads.
• replicated=true asks Harper/Fabric to apply the component deploy across the cluster rather than only the node receiving the deploy request. Include it when targeting Fabric or any clustered deployment.
• Credentials can come from CLI_TARGET_USERNAME / CLI_TARGET_PASSWORD instead of inline flags — prefer that so secrets never land in shell history or tracked files.

Replication and topology

Fabric is a distributed runtime: a project can run on one or more Harper nodes, often grouped by region or environment. Your application code is packaged as a component, and the data layer is replicated through Harper's database and clustering model.

Keep these semantics separate:

• Component code replication is controlled by deploy behavior. With replicated=true, the deployed component package should reach the cluster nodes that serve the application. Without it, you may update only the target node and leave other nodes running older code.
• Data replication is runtime/database behavior. Deploying code does not by itself prove that existing rows, schema changes, caches, or realtime state are consistent across regions or nodes.
• Thread restart is local process behavior. restart=true reloads code after the package lands; it is not a substitute for checking every node or region that receives traffic.

After a replicated deploy, verify from the topology the app actually uses:

1. Confirm the deploy command or workflow used replicated=true for Fabric/cluster targets.
2. Read harper status or the project's Fabric status command to see the expected nodes/regions.
3. Hit the public smoke endpoint through the production route, then hit a direct node or region endpoint when the project exposes one.
4. For schema or data changes, verify a write/read path that proves the expected data is visible where traffic can land.
5. If one node serves old assets or resources, treat the deploy as incomplete even when the initial target node passed smoke.

Secrets

Keep runtime secrets out of tracked files. Use environment variables, the loadEnv extension, or an OS keychain helper. Document where secrets live (which env var, which store) without recording their values.

Verification (required before reporting done)

1. bun run build — produces fresh resources.js / web/**.
2. bun run typecheck.
3. The smallest relevant test command.
4. For deploy-affecting changes, run the create-only GitHub deploy workflow when available, or manually run harper deploy_component plus the project smoke command against the local or deployed Harper endpoint.
5. For public HTTP surfaces, run the create-only ZAP baseline workflow or bash scripts/zap-baseline.sh with ZAP_TARGET_URL set to the deployed app.

If a verification command cannot run, report the exact command and the blocker — do not claim completion. When you hit a Harper/Fabric limitation or workaround, record the symptom, root cause, fix, and the tempting-but-broken alternatives in the project's Fabric runbook.

Sources

• Harper CLI overview
• Harper CLI
• Plugin API
• Harper Fabric