Pass the NodePath object to extractSymbol so it can infer const from VariableDeclarator's parents

Author: ShukantPal

packages/webdoc-parser/src/symbols-babel/build-symbol-tree.js

@@ -186,7 +186,7 @@ export default function buildSymbolTree(
       let idoc;
 
       try {
-        idoc = captureSymbols(nodePath.node, scope);
+        idoc = captureSymbols(nodePath, scope);
       } catch (e) {
         console.error(ancestorStack);
         console.log(node);
@@ -255,10 +255,11 @@ export default function buildSymbolTree(
 // them as a child of parent.
 //
 // The returned symbol is the one backed by the AST node.
-function captureSymbols(node: Node, parent: Symbol): ?Symbol {
+function captureSymbols(nodePath: NodePath, parent: Symbol): ?Symbol {
+  const node = nodePath.node;
   const symbolInfo = {};
 
-  extractSymbol(node, parent, symbolInfo);
+  extractSymbol(nodePath, parent, symbolInfo);
 
   let {
     name: simpleName,

packages/webdoc-parser/src/symbols-babel/extract-symbol.js

@@ -8,6 +8,7 @@ import {
   type FunctionExpression,
   type MemberExpression,
   type Node,
+  type NodePath,
   type VariableDeclarator,
   isArrowFunctionExpression,
   isAssignmentExpression,
@@ -54,7 +55,7 @@ import {
 // + Set the appopriate flags
 // + Set isInit & initComment if the symbol has a initializer child
 export default function extractSymbol(
-  node: Node,
+  nodePath: NodePath,
   parent: Symbol,
   out: {
     name?: ?string,
@@ -65,6 +66,8 @@ export default function extractSymbol(
     init?: ?Node
   },
 ): void {
+  const node = nodePath.node;
+
   let name;
   let flags = out.flags || 0;
   let isInit = false;
@@ -174,6 +177,11 @@ export default function extractSymbol(
     } else if (isVariableDeclarator(node)) {
       name = node.id.name;
       init = resolveInit(node);
+
+      // Variables defined with the const keyword are inferred to be readonly.
+      if (nodePath.parent && nodePath.parent.kind === "const") {
+        nodeSymbol.meta.readonly = true;
+      }
     } else {// ObjectProperty
       name = node.key.name;
       init = node.value;