WIP - add extractor, generate snippet_data

node_modules/babel-helper-flip-expressions/README.md

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+# babel-helper-flip-expressions
+
+## Installation
+
+```sh
+npm install babel-helper-flip-expressions
+```

node_modules/babel-helper-flip-expressions/lib/index.js

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+"use strict";
+
+var flipSeen = Symbol("flipSeen");
+
+module.exports = function (t) {
+  return {
+    hasSeen(node) {
+      return !!node[flipSeen];
+    },
+
+    // Takes an expressions and determines if it has
+    // more nodes that could benifit from flipping than not.
+    shouldFlip(topNode) {
+      var savings = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
+
+      visit(topNode);
+      return savings > 0;
+
+      function visit(node) {
+        if (t.isUnaryExpression(node, { operator: "!" })) {
+          savings++;
+          return;
+        }
+
+        if (t.isLogicalExpression(node)) {
+          visit(node.left);
+          visit(node.right);
+          return;
+        }
+
+        if (!(t.isBinaryExpression(node) && t.EQUALITY_BINARY_OPERATORS.indexOf(node.operator) > -1)) {
+          // Binary expressions wouldn't hurut because we know how to flip them
+          savings--;
+        }
+      }
+    },
+
+    flip(node, resultNotUsed) {
+      var lastNodeDesc = void 0;
+      var ret = visit(node);
+
+      ret[flipSeen] = true;
+
+      if (resultNotUsed && lastNodeDesc) {
+        var _lastNodeDesc = lastNodeDesc,
+            parent = _lastNodeDesc.parent,
+            key = _lastNodeDesc.key;
+
+        if (parent && key && t.isUnaryExpression(parent[key], { operator: "!" })) {
+          parent[key] = parent[key].argument;
+        }
+      }
+
+      return ret;
+
+      function visit(node, parent, key) {
+        lastNodeDesc = { parent, key };
+
+        if (t.isUnaryExpression(node, { operator: "!" })) {
+          return node.argument;
+        }
+
+        if (t.isLogicalExpression(node)) {
+          node.operator = node.operator === "&&" ? "||" : "&&";
+          node.left = visit(node.left, node, "left");
+          node.right = visit(node.right, node, "right");
+          return node;
+        }
+
+        if (t.isBinaryExpression(node)) {
+          var operator = void 0;
+          switch (node.operator) {
+            case "!==":
+              operator = "===";
+              break;
+            case "===":
+              operator = "!==";
+              break;
+            case "!=":
+              operator = "==";
+              break;
+            case "==":
+              operator = "!=";
+              break;
+          }
+
+          if (operator) {
+            node.operator = operator;
+            return node;
+          }
+
+          // Falls through to unary expression
+        }
+
+        return t.unaryExpression("!", node, true);
+      }
+    }
+  };
+};

node_modules/babel-helper-flip-expressions/package.json

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+{
+  "_from": "babel-helper-flip-expressions@^0.3.0",
+  "_id": "babel-helper-flip-expressions@0.3.0",
+  "_inBundle": false,
+  "_integrity": "sha512-kNGohWmtAG3b7tN1xocRQ5rsKkH/hpvZsMiGOJ1VwGJKhnwzR5KlB3rvKBaBPl5/IGHcopB2JN+r1SUEX1iMAw==",
+  "_location": "/babel-helper-flip-expressions",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "babel-helper-flip-expressions@^0.3.0",
+    "name": "babel-helper-flip-expressions",
+    "escapedName": "babel-helper-flip-expressions",
+    "rawSpec": "^0.3.0",
+    "saveSpec": null,
+    "fetchSpec": "^0.3.0"
+  },
+  "_requiredBy": [
+    "/babel-plugin-minify-guarded-expressions",
+    "/babel-plugin-minify-simplify"
+  ],
+  "_resolved": "https://registry.npmjs.org/babel-helper-flip-expressions/-/babel-helper-flip-expressions-0.3.0.tgz",
+  "_shasum": "f5b6394bd5219b43cf8f7b201535ed540c6e7fa2",
+  "_spec": "babel-helper-flip-expressions@^0.3.0",
+  "_where": "/Users/stefanfejes/Projects/30-seconds-of-python-code/node_modules/babel-plugin-minify-guarded-expressions",
+  "author": {
+    "name": "amasad"
+  },
+  "bugs": {
+    "url": "https://github.com/babel/minify/issues"
+  },
+  "bundleDependencies": false,
+  "deprecated": false,
+  "description": "## Installation",
+  "homepage": "https://github.com/babel/minify#readme",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "license": "MIT",
+  "main": "lib/index.js",
+  "name": "babel-helper-flip-expressions",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/minify/tree/master/packages/babel-helper-flip-expressions"
+  },
+  "version": "0.3.0"
+}