Validate a partial Mapbox style expression

validate-mapbox-expression

#!/usr/bin/env bash
set -euo pipefail

# Check a partial Mapbox style expression using gl-style-validate
# (https://github.com/mapbox/mapbox-gl-js/tree/master/src/style-spec).
#
# To install gl-style-validate:
#   $ npm install @mapbox/mapbox-gl-style-spec --global
#
# Usage:
#   $ validate-mapbox-expression '{"type": "line", "paint": {"line-width": "whoops"}}'
#   /dev/stdin:16: layers[0].paint.line-width: number expected, string found

EXPR="$1"

jq -s '{
  "version": 8,
  "sources": {
    "dummy": {
      "type": "vector",
      "url": "http://example.com/tiles.json"
    }
  },
  "layers": [
    {
      "id": "dummy",
      "source": "dummy",
      "source-layer": "dummy"
    } * .[0]
  ]
}' <<< "$EXPR" | gl-style-validate

how to run this?

@satya-auti do something like this:

1. Install the Mapbox dependency as in the inline comments
2. Save this gist to a file somewhere on your computer, e.g. /usr/bin/validate-mapbox-expression
3. Give your user account permission to execute it: chmod +x /usr/bin/validate-mapbox-expression
4. Run it as in the inline comments