1 files changed, 56 insertions, 0 deletions
diff --git a/node_modules/babel-plugin-minify-simplify/lib/helpers.js b/node_modules/babel-plugin-minify-simplify/lib/helpers.js
new file mode 100644
index 00000000..dfbe7c2a
--- /dev/null
+++ b/node_modules/babel-plugin-minify-simplify/lib/helpers.js
@@ -0,0 +1,56 @@
+"use strict";
+
+const VOID_0 = t => t.unaryExpression("void", t.numericLiteral(0), true);
+
+const evaluate = require("babel-helper-evaluate-path"); // Types as Symbols - for comparing types
+
+
+const types = {}; // This is a test key which is used to avoid Object.keys check
+// Object.keys() check is really expensive
+// https://gist.github.com/vigneshshanmugam/c766550ecd02292dcdfbf0bf013b9d3d
+
+const testKey = "Expression";
+
+const typeSymbols = t => {
+  // don't recompute
+  if (types[testKey] !== undefined) {
+    return types;
+  }
+
+  t.TYPES.forEach(type => {
+    types[type] = Symbol.for(type);
+  });
+  return types;
+};
+
+const isNodeOfType = (t, node, typeSymbol) => typeof typeSymbol !== "symbol" ? false : t["is" + Symbol.keyFor(typeSymbol)](node);
+
+const isPatternMatchesPath = t => function _isPatternMatchesPath(patternValue, inputPath) {
+  if (Array.isArray(patternValue)) {
+    for (let i = 0; i < patternValue.length; i++) {
+      if (_isPatternMatchesPath(patternValue[i], inputPath)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  if (typeof patternValue === "function") {
+    return patternValue(inputPath);
+  }
+
+  if (isNodeOfType(t, inputPath.node, patternValue)) return true;
+  const evalResult = evaluate(inputPath);
+  if (!evalResult.confident || !inputPath.isPure()) return false;
+  return evalResult.value === patternValue;
+};
+
+module.exports = {
+  VOID_0,
+  // Types as Symbols
+  typeSymbols,
+  // This is required for resolving type aliases
+  isNodeOfType,
+  isPatternMatchesPath
+};
+\ No newline at end of file