adding an index and wasm files to initialize the module

this maintains API compatibility with the versions that used to be compiled with the older emscripten

index.js

@@ -0,0 +1 @@
+module.exports = require('./libheif/libheif.js')();

package.json

@@ -1,8 +1,8 @@
 {
   "name": "libheif-js",
-  "version": "1.15.1",
+  "version": "1.17.1",
   "description": "Emscripten distribution of libheif for Node.JS and the browser",
-  "main": "libheif/libheif.js",
+  "main": "index.js",
   "scripts": {
     "pretest": "npm run -s images",
     "test": "mocha test/**/*.test.js",

test/libheif.test.js

@@ -8,9 +8,34 @@ const { PNG } = require('pngjs');
 const pixelmatch = require('pixelmatch');
 
 const pkg = require('../package.json');
-const libheif = require('../');
 
-describe('libheif', () => {
+describe('libheif (JS)', () => {
+  const moduleFile = '../';
+
+  runTests(require(moduleFile));
+
+  it('resolves to index file', () => {
+    const expected = path.resolve(root, 'index.js');
+    const actual = require.resolve(moduleFile);
+
+    expect(actual).to.equal(expected);
+  });
+});
+
+describe('libheif (WASM)', () => {
+  const moduleFile = '../wasm';
+
+  runTests(require(moduleFile));
+
+  it('resolves to wasm file', () => {
+    const expected = path.resolve(root, 'wasm.js');
+    const actual = require.resolve(moduleFile);
+
+    expect(actual).to.equal(expected);
+  });
+});
+
+function runTests(libheif) {
   const readControl = async name => {
     const buffer = await fs.readFile(path.resolve(root, `temp/${name}`));
     const { data, width, height } = PNG.sync.read(buffer);
@@ -30,7 +55,7 @@ describe('libheif', () => {
   it('is the correct version', () => {
     expect(libheif).to.have.property('heif_get_version')
       .and.to.be.a('function');
-    expect(libheif.heif_get_version()).to.equal('1.15.1')
+    expect(libheif.heif_get_version()).to.equal('1.17.1')
       .and.to.equal(pkg.version);
   });
 
@@ -85,4 +110,4 @@ describe('libheif', () => {
       compare(control.data, arrayBuffer, control.width, control.height);
     });
   });
-});
+}

wasm.js

@@ -0,0 +1,30 @@
+// I technically don't have to do this, but I am keeping it around
+// for demonstration purposes
+const fs = require('fs');
+const wasmBinary = fs.readFileSync('./libheif-wasm/libheif.wasm');
+
+module.exports = require('./libheif-wasm/libheif.js')({ wasmBinary });
+
+// NOTE: for webpack, you need to do something like:
+/*
+
+import libheif from './libheif-wasm/libheif.js'
+import wasmBinary from './libheif-wasm/libheif.wasm'
+
+export default libheif({ wasmBinary });
+
+*/
+
+// then add this to rules:
+/*
+
+module.exports = {
+  module: {
+    rules: [{
+      test: /\.wasm$/,
+      type: "asset/inline",
+    }]
+  },
+};
+
+*/