planning

node_modules/@mapbox/mapbox-gl-style-spec/rollup.config.js

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+import path from 'path';
+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?
+const esm = 'esm' in process.env;
+
+import {fileURLToPath} from 'url';
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+
+const config = [{
+    input: `${__dirname}/style-spec.js`,
+    output: {
+        name: 'mapboxGlStyleSpecification',
+        file: `${__dirname}/dist/${esm ? 'index.es.js' : 'index.cjs'}`,
+        format: esm ? 'esm' : 'umd',
+        sourcemap: true
+    },
+    plugins: [
+        {
+            name: 'dep-checker',
+            resolveId(source, importer) {
+                // Some users reference modules within style-spec package directly, instead of the bundle
+                // This means that files within the style-spec package should NOT import files from the parent mapbox-gl-js tree.
+                // This check will cause the build to fail on CI allowing these issues to be caught.
+                if (importer && !importer.includes('node_modules')) {
+                    const resolvedPath = path.join(importer, source);
+                    const fromRoot = path.relative(__dirname, resolvedPath);
+                    if (fromRoot.length > 2 && fromRoot.slice(0, 2) === '..') {
+                        throw new Error(`Module ${importer} imports ${source} from outside the style-spec package root directory.`);
+                    }
+                }
+
+                return null;
+            }
+        },
+        // https://github.com/zaach/jison/issues/351
+        replace({
+            include: /\/jsonlint-lines-primitives\/lib\/jsonlint.js/,
+            delimiters: ['', ''],
+            values: {
+                '_token_stack:': ''
+            }
+        }),
+        flow(),
+        json(),
+        unassert(),
+        resolve({
+            browser: true,
+            preferBuiltins: false
+        }),
+        commonjs()
+    ]
+}];
+export default config;