Provide minified style spec, and use it where applicable

src/style-spec/feature_filter/index.js

@@ -3,7 +3,7 @@
 import {createExpression} from '../expression/index.js';
 import {isFeatureConstant} from '../expression/is_constant.js';
 import {deepUnbundle} from '../util/unbundle_jsonlint.js';
-import latest from '../reference/latest.js';
+import {min as latest} from '../reference/latest.js';
 import type {GlobalProperties, Feature} from '../expression/index.js';
 import type {CanonicalTileID} from '../../source/tile_id.js';
 import type Point from '@mapbox/point-geometry';

src/style-spec/reference/latest.js

@@ -1,7 +1,8 @@
 // @flow
 
-import spec from './v8.json';
+import * as spec from './v8.json';
 
-export type StyleReference = typeof spec;
+export type StyleReference = typeof spec.default;
 
-export default spec;
+export default spec.default;
+export const min = spec.default;

src/style-spec/rollup.config.js

@@ -3,7 +3,6 @@ import replace from '@rollup/plugin-replace';
 import resolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
 import unassert from 'rollup-plugin-unassert';
-import json from '@rollup/plugin-json';
 import {flow} from '../../build/rollup_plugins.js';
 
 // Build es modules?
@@ -12,6 +11,8 @@ const esm = 'esm' in process.env;
 import {fileURLToPath} from 'url';
 const __dirname = fileURLToPath(new URL('.', import.meta.url));
 
+const reviver = (key, value) => ['doc', 'example', 'sdk-support'].includes(key) ? undefined : value;
+
 const config = [{
     input: `${__dirname}/style-spec.js`,
     output: {
@@ -46,8 +47,33 @@ const config = [{
                 '_token_stack:': ''
             }
         }),
+        replace({
+            include: /\/reference\/latest\.js$/,
+            delimiters: ['', ''],
+            values: {
+                'export const min = spec.default': 'export const min = spec.min'
+            }
+        }),
         flow(),
-        json(),
+        {
+            name: 'json-min',
+            transform(code, id) {
+                if (id.endsWith('.json')) {
+                    const json = JSON.parse(code);
+                    const min = JSON.stringify(json, reviver);
+                    const full = JSON.stringify(json);
+                    code = `export default ${full}`;
+                    if (min !== full) {
+                        code += `\nexport const min = ${min}`;
+                    }
+                    return {
+                        code,
+                        map: null
+                    };
+                }
+                return null;
+            }
+        },
         unassert(),
         resolve({
             browser: true,

src/style-spec/style-spec.js

@@ -66,7 +66,7 @@ export type StylePropertySpecification = {
 };
 
 import v8 from './reference/v8.json';
-import latest from './reference/latest.js';
+import latest, {min as specMin} from './reference/latest.js';
 import format from './format.js';
 import migrate from './migrate.js';
 import composite from './composite.js';
@@ -109,6 +109,7 @@ const visit = {eachSource, eachLayer, eachProperty};
 export {
     v8,
     latest,
+    specMin,
     format,
     migrate,
     composite,