feat(interoputility): export interop methods

src/interop/context.ts

@@ -1,7 +1,5 @@
-import { mountDirectory, unmount } from 'emscripten-wasm-loader';
-import * as nanoid from 'nanoid';
-import { SassAsmModule } from '../SassAsmModule';
-import { log } from '../util/logger';
+import { SassFileContext, SassFileContextInterface } from './file/sassFileContext';
+import { buildInteropUtility } from './interopUtility';
 import { SassOptions, SassOptionsInterface } from './options/sassOptions';
 import { wrapSassOptions } from './options/wrapSassOptions';
 import { wrapSassContext } from './wrapSassContext';
@@ -12,31 +10,19 @@ import { wrapSassContext } from './wrapSassContext';
  *
  * @param asmModule
  */
-const buildContext = (asmModule: SassAsmModule) => {
-  const { cwrap, FS, stackAlloc, stringToUTF8, Pointer_stringify } = asmModule;
-  const cwrapCtx = wrapSassContext(cwrap);
-  const cwrapOptions = wrapSassOptions(cwrap);
-
-  const str = {
-    alloc: (value: string) => {
-      const len = (value.length << 2) + 1;
-      const ret = stackAlloc(len);
-      stringToUTF8(value, ret, len);
-      return ret;
-    },
-    ptrToString: Pointer_stringify
-  };
-
-  const nodePathId = `/${nanoid(45)}`;
-  FS.mkdir(nodePathId);
-  log(`buildContext: root mounting point created`, { nodePathId });
-
-  const mountPath = mountDirectory(FS, nodePathId);
-  const unmountPath = unmount(FS, nodePathId);
+const buildContext = (
+  cwrapContext: ReturnType<typeof wrapSassContext>,
+  cwrapOptions: ReturnType<typeof wrapSassOptions>,
+  interop: ReturnType<typeof buildInteropUtility>
+) => {
+  const { str, mount, unmount } = interop;
 
   return {
     options: {
-      create: () => new SassOptions(cwrapCtx, cwrapOptions, mountPath, unmountPath, str) as SassOptionsInterface
+      create: () => new SassOptions(cwrapContext, cwrapOptions, mount, unmount, str) as SassOptionsInterface
+    },
+    file: {
+      create: () => new SassFileContext() as SassFileContextInterface
     }
   };
 };

src/interop/interopUtility.ts

@@ -0,0 +1,37 @@
+import { mountDirectory, unmount } from 'emscripten-wasm-loader';
+import * as nanoid from 'nanoid';
+import { SassAsmModule } from '../SassAsmModule';
+import { log } from '../util/logger';
+
+/**
+ * Construct few utility function to be used interop between raw libsass interface.
+ *
+ * @param {SassAsmModule} asmModule
+ */
+const buildInteropUtility = (asmModule: SassAsmModule) => {
+  const { FS, stackAlloc, stringToUTF8, Pointer_stringify } = asmModule;
+
+  const str = {
+    alloc: (value: string) => {
+      const len = (value.length << 2) + 1;
+      const ret = stackAlloc(len);
+      stringToUTF8(value, ret, len);
+      return ret;
+    },
+    ptrToString: Pointer_stringify
+  };
+
+  const nodePathId = `/${nanoid(45)}`;
+  FS.mkdir(nodePathId);
+  log(`sassLoader: root mounting point created`, { nodePathId });
+
+  const mountPath = mountDirectory(FS, nodePathId);
+  const unmountPath = unmount(FS, nodePathId);
+  return {
+    str,
+    mount: mountPath,
+    unmount: unmountPath
+  };
+};
+
+export { buildInteropUtility };

src/sassLoader.ts

@@ -1,5 +1,8 @@
 import { buildContext } from './interop/context';
+import { buildInteropUtility } from './interop/interopUtility';
 import { getVersion } from './interop/miscellaneous';
+import { wrapSassOptions } from './interop/options/wrapSassOptions';
+import { wrapSassContext } from './interop/wrapSassContext';
 import { SassAsmModule } from './SassAsmModule';
 import { SassFactory } from './SassFactory';
 
@@ -10,8 +13,18 @@ import { SassFactory } from './SassFactory';
  * @returns {SassFactory}
  */
 export const sassLoader = (asmModule: SassAsmModule): SassFactory => {
+  const { cwrap } = asmModule;
+  const cwrapCtx = wrapSassContext(cwrap);
+  const cwrapOptions = wrapSassOptions(cwrap);
+  const interop = buildInteropUtility(asmModule);
+
   return {
     getVersion: getVersion(asmModule),
-    context: buildContext(asmModule)
+    context: buildContext(cwrapCtx, cwrapOptions, interop),
+    interop,
+    raw: {
+      context: cwrapCtx,
+      options: cwrapOptions
+    }
   };
 };