planning

node_modules/@mapbox/mapbox-gl-style-spec/migrate.js

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+
+import migrateToV8 from './migrate/v8.js';
+import migrateToExpressions from './migrate/expressions.js';
+
+/**
+ * Migrate a Mapbox GL Style to the latest version.
+ *
+ * @private
+ * @alias migrate
+ * @param {object} style a Mapbox GL Style
+ * @returns {Object} a migrated style
+ * @example
+ * var fs = require('fs');
+ * var migrate = require('mapbox-gl-style-spec').migrate;
+ * var style = fs.readFileSync('./style.json', 'utf8');
+ * fs.writeFileSync('./style.json', JSON.stringify(migrate(style)));
+ */
+export default function(style) {
+    let migrated = false;
+
+    if (style.version === 7) {
+        style = migrateToV8(style);
+        migrated = true;
+    }
+
+    if (style.version === 8) {
+        migrated = migrateToExpressions(style);
+        migrated = true;
+    }
+
+    if (!migrated) {
+        throw new Error('cannot migrate from', style.version);
+    }
+
+    return style;
+}