init

jdenticon-js/build/gulp/ast-transform-stream.js

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+const { Transform } = require("stream");
+const { parse } = require("acorn");
+const { Replacement } = require("./replacement");
+
+function astTransformStream(transformer) {
+    return new Transform({
+        objectMode: true,
+
+        transform(inputFile, _, fileDone) {
+            const input = inputFile.contents.toString();
+            
+            const comments = [];
+            const ast = parse(input, {
+                ecmaVersion: 10,
+                sourceType: "module",
+                onComment: comments,
+            });
+
+            const replacement = new Replacement();
+            transformer(replacement, ast, comments, input);
+            const output = replacement.replace(input, inputFile.sourceMap);
+            
+            inputFile.contents = Buffer.from(output.output);
+
+            if (inputFile.sourceMap) {
+                inputFile.sourceMap = output.sourceMap;
+            }
+
+            fileDone(null, inputFile);
+        }
+    });
+}
+
+module.exports = transformer => () => astTransformStream(transformer);