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jdenticon-js/build/gulp/rollup.js

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+/**
+ * Jdenticon
+ * https://github.com/dmester/jdenticon
+ * Copyright © Daniel Mester Pirttijärvi
+ */
+
+const { rollup } = require("rollup");
+const Vinyl = require("vinyl");
+const applySourceMap = require("vinyl-sourcemaps-apply");
+const { Transform } = require("stream");
+
+function rollupStream(options) {
+    return new Transform({
+        objectMode: true,
+
+        transform(inputFile, _, fileDone) {
+            const inputOptions = {
+                onwarn: warn => console.warn(warn.toString()),
+                ...options,
+                input: inputFile.path,
+            };
+            delete inputOptions.output;
+
+            rollup(inputOptions).then(bundle => {
+                return bundle.generate({
+                    ...options.output,
+                    sourcemap: !!inputFile.sourceMap
+                });
+
+            }).then(outputs => {
+
+                for (const output of outputs.output) {
+                    if (output.type === "chunk") {
+                        const outputFile = new Vinyl({
+                            cwd: inputFile.cwd,
+                            base: inputFile.base,
+                            path: inputFile.path,
+                            contents: Buffer.from(output.code),
+                        });
+
+                        if (inputFile.sourceMap) {
+                            applySourceMap(outputFile, output.map);
+                        }
+
+                        this.push(outputFile);
+                    }
+                }
+
+                fileDone();
+                
+            }, err => fileDone(err));
+        }
+    });
+}
+
+module.exports = rollupStream;