1 files changed, 70 insertions, 0 deletions
diff --git a/@linaria/packages/rollup/src/index.ts b/@linaria/packages/rollup/src/index.ts
new file mode 100644
index 0000000..64ba9fc
--- /dev/null
+++ b/@linaria/packages/rollup/src/index.ts
@@ -0,0 +1,70 @@
+/**
+ * This file contains a Rollup loader for Linaria.
+ * It uses the transform.ts function to generate class names from source code,
+ * returns transformed code without template literals and attaches generated source maps
+ */
+
+import { createFilter } from '@rollup/pluginutils';
+import { transform, slugify, Result } from '@linaria/babel-preset';
+import type { PluginOptions, Preprocessor } from '@linaria/babel-preset';
+
+type RollupPluginOptions = {
+  include?: string | string[];
+  exclude?: string | string[];
+  sourceMap?: boolean;
+  preprocessor?: Preprocessor;
+} & Partial<PluginOptions>;
+
+export default function linaria({
+  include,
+  exclude,
+  sourceMap,
+  preprocessor,
+  ...rest
+}: RollupPluginOptions = {}) {
+  const filter = createFilter(include, exclude);
+  const cssLookup: { [key: string]: string } = {};
+
+  return {
+    name: 'linaria',
+    load(id: string) {
+      return cssLookup[id];
+    },
+    /* eslint-disable-next-line consistent-return */
+    resolveId(importee: string) {
+      if (importee in cssLookup) return importee;
+    },
+    transform(
+      code: string,
+      id: string
+    ): { code: string; map: Result['sourceMap'] } | undefined {
+      // Do not transform ignored and generated files
+      if (!filter(id) || id in cssLookup) return;
+
+      const result = transform(code, {
+        filename: id,
+        preprocessor,
+        pluginOptions: rest,
+      });
+
+      if (!result.cssText) return;
+
+      let { cssText } = result;
+
+      const slug = slugify(cssText);
+      const filename = `@linaria:${id.replace(/\.js$/, '')}_${slug}.css`;
+
+      if (sourceMap && result.cssSourceMapText) {
+        const map = Buffer.from(result.cssSourceMapText).toString('base64');
+        cssText += `/*# sourceMappingURL=data:application/json;base64,${map}*/`;
+      }
+
+      cssLookup[filename] = cssText;
+
+      result.code += `\nimport ${JSON.stringify(filename)};\n`;
+
+      /* eslint-disable-next-line consistent-return */
+      return { code: result.code, map: result.sourceMap };
+    },
+  };
+}