[Fix] jsx-no-constructed-context-values: avoid a crash with as X TS code

Fixes #2894

Author: ljharb

CHANGELOG.md

@@ -5,6 +5,11 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## Unreleased
 
+### Fixed
+* [`jsx-no-constructed-context-values`]: avoid a crash with `as X` TS code ([#2894][] @ljharb)
+
+[#2894]: https://github.com/yannickcr/eslint-plugin-react/issues/2894
+
 ## [7.22.0] - 2020.12.29
 
 ### Added

lib/rules/jsx-no-constructed-context-values.js

@@ -98,7 +98,7 @@ function isConstruction(node, callScope) {
     case 'JSXElement':
       return {type: 'JSX element', node};
     case 'AssignmentExpression': {
-      const construct = isConstruction(node.right);
+      const construct = isConstruction(node.right, callScope);
       if (construct != null) {
         return {
           type: 'assignment expression',
@@ -110,7 +110,7 @@ function isConstruction(node, callScope) {
     }
     case 'TypeCastExpression':
     case 'TSAsExpression':
-      return isConstruction(node.expression);
+      return isConstruction(node.expression, callScope);
     default:
       return null;
   }

tests/lib/rules/jsx-no-constructed-context-values.js

@@ -29,7 +29,7 @@ const parserOptions = {
 
 const ruleTester = new RuleTester({parserOptions});
 ruleTester.run('react-no-constructed-context-values', rule, {
-  valid: [
+  valid: [].concat(
     {
       code: '<Context.Provider value={props}></Context.Provider>'
     },
@@ -105,8 +105,44 @@ ruleTester.run('react-no-constructed-context-values', rule, {
           return (<Context.Provider value={a}></Context.Provider>);
         }
       `
-    }
-  ],
+    },
+    parsers.TS(
+      {
+        code: `
+          import React from 'react';
+          import MyContext from './MyContext';
+
+          const value = '';
+
+          function ContextProvider(props) {
+              return (
+                  <MyContext.Provider value={value as any}>
+                      {props.children}
+                  </MyContext.Provider>
+              )
+          }
+        `,
+        parser: parsers.TYPESCRIPT_ESLINT
+      },
+      {
+        code: `
+          import React from 'react';
+          import MyContext from './MyContext';
+
+          const value = '';
+
+          function ContextProvider(props) {
+              return (
+                  <MyContext.Provider value={value as any}>
+                      {props.children}
+                  </MyContext.Provider>
+              )
+          }
+        `,
+        parser: parsers['@TYPESCRIPT_ESLINT']
+      }
+    )
+  ),
   invalid: [
     {
       // Invalid because object construction creates a new identity