Initial build system

Author: surma

.gitignore

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+node_modules
+dist

package-lock.json

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+{
+  "name": "wasm-feature-detect",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "build": "rollup -c",
+    "fmt": "prettier --write './{,src,rollup-plugins}/**/*.{js,md}'"
+  },
+  "keywords": [],
+  "author": "Surma <[email protected]>",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "prettier": "^1.18.2",
+    "rollup": "^1.20.3",
+    "rollup-plugin-terser": "^5.1.1"
+  }
+}

package.json

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { promises as fsp } from "fs";
+import { dirname, join } from "path";
+
+export default function({ indexPath, pluginFolder }) {
+  const rootPluginPath = join(dirname(indexPath), pluginFolder);
+  return {
+    resolveId(id) {
+      if (id === indexPath) {
+        return id;
+      }
+    },
+    async load(id) {
+      if (id !== indexPath) {
+        return;
+      }
+
+      const plugins = await fsp.readdir(rootPluginPath);
+      const src = plugins
+        .map(
+          plugin =>
+            `export {default as ${plugin}} from "./${pluginFolder}/${plugin}/index.js";`
+        )
+        .join("\n");
+      return src;
+    }
+  };
+}

rollup-plugins/index-generator.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { terser } from "rollup-plugin-terser";
+
+import indexGenerator from "./rollup-plugins/index-generator.js";
+
+export default {
+  input: "./src/index.js",
+  output: {
+    dir: "dist",
+    format: "esm"
+  },
+  plugins: [
+    indexGenerator({ indexPath: "./src/index.js", pluginFolder: "detectors" }),
+    terser()
+  ]
+};

rollup.config.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export default function() {
+  return "simd";
+}

src/detectors/simd/index.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export default function() {
+  return "threads";
+}

src/detectors/threads/index.js

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+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This is a dummy file.
+// The contents will be generated by rollup-plugins/index-generator.js