larry babby and threejs for glsl

webGl/my-threejs-test/node_modules/@parcel/transformer-babel/src/remapAstLocations.js

@@ -0,0 +1,70 @@
+// @flow strict-local
+
+import type {File as BabelNodeFile} from '@babel/types';
+import type SourceMap from '@parcel/source-map';
+import type {Node} from '@babel/types';
+import typeof * as BabelTypes from '@babel/types';
+
+export function remapAstLocations(
+  t: BabelTypes,
+  ast: BabelNodeFile,
+  map: SourceMap,
+) {
+  // remap ast to original mappings
+  // This improves sourcemap accuracy and fixes sourcemaps when scope-hoisting
+  traverseAll(t, ast.program, node => {
+    if (node.loc) {
+      if (node.loc?.start) {
+        let mapping = map.findClosestMapping(
+          node.loc.start.line,
+          node.loc.start.column,
+        );
+
+        if (mapping?.original) {
+          // $FlowFixMe
+          node.loc.start.line = mapping.original.line;
+          // $FlowFixMe
+          node.loc.start.column = mapping.original.column;
+
+          // $FlowFixMe
+          let length = node.loc.end.column - node.loc.start.column;
+
+          // $FlowFixMe
+          node.loc.end.line = mapping.original.line;
+          // $FlowFixMe
+          node.loc.end.column = mapping.original.column + length;
+
+          // $FlowFixMe
+          node.loc.filename = mapping.source;
+        } else {
+          // Maintain null mappings?
+          node.loc = null;
+        }
+      }
+    }
+  });
+}
+
+function traverseAll(
+  t: BabelTypes,
+  node: Node,
+  visitor: (node: Node) => void,
+): void {
+  if (!node) {
+    return;
+  }
+
+  visitor(node);
+
+  for (let key of t.VISITOR_KEYS[node.type] || []) {
+    // $FlowFixMe
+    let subNode: Node | Array<Node> = node[key];
+    if (Array.isArray(subNode)) {
+      for (let i = 0; i < subNode.length; i++) {
+        traverseAll(t, subNode[i], visitor);
+      }
+    } else {
+      traverseAll(t, subNode, visitor);
+    }
+  }
+}