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SKILL_JS5_ARCGIS / arcgis-arcade

AGENTS.md1 starsChanged 6 months agoMITView on GitHub

Quick-reference for Arcade. Read before writing expressions.

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AGENTS.md

Agent Guide: arcgis-arcade

Quick-reference for Arcade. Read before writing expressions.

Quick Decision Tree

  1. Popup? → expressionInfos (popup profile).
  2. Label? → label expression (label profile).
  3. Renderer/visual variable? → valueExpression (renderer profile).
  4. Manual compile? → createArcadeExecutor(script, profile).

Setup Checklist

  • Declare the right variables in the profile ($feature, etc.).
  • Compile once, reuse the executor.
  • Keep label/renderer expressions lightweight.
  • Prefer declaring expressions on the consuming object.

Anti-patterns (one-liner reminders)

  • ❌ Hand-written profiles that miss variables: use createArcadeProfile("popup" | "labeling" | "visualization" | …).
  • ❌ Recompiling per feature.
  • ❌ Querying features without executor.fieldsUsed / geometryUsed: the expression returns 0, no error.
  • ❌ execute() when executor.isAsync (FeatureSet functions): use executeAsync().
  • ❌ Area()/Length() on Web Mercator geometry for real sizes: AreaGeodetic()/LengthGeodetic().
  • ❌ lruCache (deprecated in 5.0): cache.

Files in This Skill

  • SKILL.md / SKILL.es.md — full guides
  • references/api-detail.md — executor / profile
  • references/examples.md — popup / label / renderer
  • references/pitfalls.md — extended troubleshooting
  • scripts/snippet-arcade.ts

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