feat(powerbi): migrate to TypeScript and fix embed-token refresh

[rusko124]

PR Type

Enhancement, Bug fix, Tests

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Description

• Migrates Power BI app to TypeScript

• Adds expiration-aware token refresh

• Adds service and utility unit tests

• Uses Edge Apps build tooling

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Diagram Walkthrough

flowchart LR
  legacy["Legacy static JavaScript"]
  ts["TypeScript source modules"]
  token["Expiration-aware token refresh"]
  tests["Bun unit tests"]
  build["Edge Apps build pipeline"]
  legacy -- "migrated to" --> ts
  ts -- "adds" --> token
  ts -- "covered by" --> tests
  ts -- "built with" --> build

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File Walkthrough

	Relevant files
Enhancement	9 files globals.d.ts Add Screenly settings global TypeScript definitions            +17/-0    main.ts Add TypeScript app entrypoint and panic setup                        +16/-0    services.lib.ts Extract embed service and error rendering helpers                +50/-0    services.ts Implement token retrieval, embedding, and refresh                +126/-0  services.types.ts Add shared Power BI service interfaces                                      +11/-0    utils.lib.ts Define refresh and backoff timing constants                            +8/-0      utils.ts Add refresh timing and embed type utilities                            +62/-0    style.css Add app layout and error view styles                                          [link]    index.html Load TypeScript module instead of static scripts                  +2/-4
Tests	2 files services.test.ts Add Power BI service unit coverage                                              +292/-0  utils.test.ts Add utility timing and URL tests                                                  +140/-0
Miscellaneous	1 files main.js Remove legacy vanilla JavaScript implementation                    +0/-180
Configuration changes	2 files package.json Switch scripts to Edge Apps toolchain                                        +16/-10  tsconfig.json Add TypeScript configuration for source build                        +8/-0

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[Copilot]

Pull request overview

This PR migrates the Power BI edge app from a static “vanilla JS + vendor copies” setup to a TypeScript + @screenly/edge-apps build pipeline, and updates the embed-token refresh logic to reschedule refreshes based on token expiration with exponential backoff on failures.

Changes:

• Replaces static/js/main.js with a TypeScript entrypoint (src/main.ts) and moves core logic into typed service/util modules.
• Fixes token refresh scheduling by using the embed token expiration (plus a capped interval) and adds exponential backoff for refresh failures.
• Introduces unit tests (Bun + happy-dom) for refresh timing utilities and Power BI service behavior; updates build/test/lint scripts accordingly.

Reviewed changes

Copilot reviewed 13 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
edge-apps/powerbi/tsconfig.json	Adds TS config extending the shared edge-apps config.
edge-apps/powerbi/static/js/vendor/panic-overlay.min.js	Removes vendored panic-overlay bundle (now imported via bundler).
edge-apps/powerbi/static/js/main.js	Removes legacy JS entrypoint (replaced by TS modules).
edge-apps/powerbi/src/utils.ts	Adds refresh-interval, refresh-delay, backoff, and embed-type utilities.
edge-apps/powerbi/src/utils.test.ts	Adds Bun unit tests for utility timing/type helpers.
edge-apps/powerbi/src/utils.lib.ts	Adds constants for refresh/backoff timing behavior.
edge-apps/powerbi/src/services.types.ts	Introduces typed contracts for token and error payloads.
edge-apps/powerbi/src/services.ts	Adds typed token fetching, refresh loop, and embed initialization logic.
edge-apps/powerbi/src/services.test.ts	Adds tests for token fetch, refresh loop scheduling, embed init, and error rendering.
edge-apps/powerbi/src/services.lib.ts	Adds embed service singleton + shared error rendering helper.
edge-apps/powerbi/src/main.ts	New TS entrypoint wiring panic-overlay + initialization.
edge-apps/powerbi/src/globals.d.ts	Adds global screenly typings for the app.
edge-apps/powerbi/src/css/style.css	Moves styles into the bundler pipeline and adds error UI styling.
edge-apps/powerbi/package.json	Switches to edge-apps-scripts build/lint/type-check and enables Bun tests.
edge-apps/powerbi/index.html	Switches to TS module entrypoint.
edge-apps/powerbi/bun.lock	Updates lockfile for new tooling/testing dependencies.
edge-apps/powerbi/.gitignore	Ignores node_modules/ and dist/.

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⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

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