[Fix]: use variable value in prop type field defined by a variable

lib/util/propTypes.js

@@ -390,6 +390,27 @@ module.exports = function propTypesInstructions(context, components, utils) {
     });
   }
 
+  /**
+   * Resolve node of type Identifier when building declaration types.
+   * @param {ASTNode} node
+   * @param {Function} callback called with the resolved value only if resolved.
+   */
+  function resolveValueForIdentifierNode(node, callback) {
+    if (
+      node
+      && node.type === 'Identifier'
+    ) {
+      const scope = context.getScope();
+      const identVariable = scope.variableScope.variables.find(
+        (variable) => variable.name === node.name
+      );
+      if (identVariable) {
+        const definition = identVariable.defs[identVariable.defs.length - 1];
+        callback(definition.node.init);
+      }
+    }
+  }
+
   /**
    * Creates the representation of the React propTypes for the component.
    * The representation is used to verify nested used properties.
@@ -408,6 +429,23 @@ module.exports = function propTypesInstructions(context, components, utils) {
       return {};
     }
 
+    let identNodeResolved = false;
+    // Resolve identifier node for cases where isRequired is set in
+    // the variable declaration or not at all.
+    // const variableType = PropTypes.shape({ foo: ... }).isRequired
+    // propTypes = {
+    //   example: variableType
+    // }
+    // --------
+    // const variableType = PropTypes.shape({ foo: ... })
+    // propTypes = {
+    //   example: variableType
+    // }
+    resolveValueForIdentifierNode(value, (newValue) => {
+      identNodeResolved = true;
+      value = newValue;
+    });
+
     if (
       value
       && value.type === 'MemberExpression'
@@ -418,6 +456,18 @@ module.exports = function propTypesInstructions(context, components, utils) {
       value = value.object;
     }
 
+    // Resolve identifier node for cases where isRequired is set in
+    // the prop types.
+    // const variableType = PropTypes.shape({ foo: ... })
+    // propTypes = {
+    //   example: variableType.isRequired
+    // }
+    if (!identNodeResolved) {
+      resolveValueForIdentifierNode(value, (newValue) => {
+        value = newValue;
+      });
+    }
+
     // Verify PropTypes that are functions
     if (
       value

tests/lib/rules/prop-types.js

@@ -4949,6 +4949,138 @@ ruleTester.run('prop-types', rule, {
       {
         message: '\'ordering\' is missing in props validation'
       }]
+    },
+    {
+      code: `
+        const firstType = PropTypes.shape({
+          id: PropTypes.number,
+        });
+        class ComponentX extends React.Component {
+          static propTypes = {
+            first: firstType.isRequired,
+          };
+          render() {
+            return (
+              <div>
+                <div>Counter = {this.props.first.name}</div>
+              </div>
+            );
+          }
+        }
+      `,
+      parser: parsers.BABEL_ESLINT,
+      errors: [{
+        message: "'first.name' is missing in props validation"
+      }]
+    },
+    {
+      code: `
+        const firstType = PropTypes.shape({
+          id: PropTypes.number,
+        }).isRequired;
+        class ComponentX extends React.Component {
+          static propTypes = {
+            first: firstType,
+          };
+          render() {
+            return (
+              <div>
+                <div>Counter = {this.props.first.name}</div>
+              </div>
+            );
+          }
+        }
+      `,
+      parser: parsers.BABEL_ESLINT,
+      errors: [{
+        message: "'first.name' is missing in props validation"
+      }]
+    },
+    {
+      code: `
+        const firstType = PropTypes.shape({
+          id: PropTypes.number,
+        });
+        class ComponentX extends React.Component {
+          static propTypes = {
+            first: firstType,
+          };
+          render() {
+            return (
+              <div>
+                <div>Counter = {this.props.first.name}</div>
+              </div>
+            );
+          }
+        }
+      `,
+      parser: parsers.BABEL_ESLINT,
+      errors: [{
+        message: "'first.name' is missing in props validation"
+      }]
+    },
+    {
+      code: `
+        function Foo({
+          foo: {
+            bar: foo,
+            baz
+          },
+        }) {
+          return <p>{foo.reduce(() => 5)}</p>;
+        }
+        const fooType = PropTypes.shape({
+          bar: PropTypes.arrayOf(PropTypes.string).isRequired,
+        }).isRequired
+        Foo.propTypes = {
+          foo: fooType,
+        };
+      `,
+      errors: [{
+        message: '\'foo.baz\' is missing in props validation'
+      }]
+    },
+    {
+      code: `
+        function Foo({
+          foo: {
+            bar: foo,
+            baz
+          },
+        }) {
+          return <p>{foo.reduce(() => 5)}</p>;
+        }
+        const fooType = PropTypes.shape({
+          bar: PropTypes.arrayOf(PropTypes.string).isRequired,
+        })
+        Foo.propTypes = {
+          foo: fooType.isRequired,
+        };
+      `,
+      errors: [{
+        message: '\'foo.baz\' is missing in props validation'
+      }]
+    },
+    {
+      code: `
+        function Foo({
+          foo: {
+            bar: foo,
+            baz
+          },
+        }) {
+          return <p>{foo.reduce(() => 5)}</p>;
+        }
+        const fooType = PropTypes.shape({
+          bar: PropTypes.arrayOf(PropTypes.string).isRequired,
+        })
+        Foo.propTypes = {
+          foo: fooType,
+        };
+      `,
+      errors: [{
+        message: '\'foo.baz\' is missing in props validation'
+      }]
     }
   ]
 });