refactor(core): add createElement helper APIs and reuse them in rules

packages/core/docs/README.md

@@ -137,6 +137,10 @@
 | ------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | [~~getClassComponentCollector~~](functions/getClassComponentCollector.md)             | Get an api and visitor object for the rule to collect class components.                                                                                  |
 | [getClassId](functions/getClassId.md)                                                 | Get the class identifier of a class node.                                                                                                                |
+| [getCreateElementChildrenArguments](functions/getCreateElementChildrenArguments.md)   | Get the children arguments (the arguments after the props object) of a `createElement` call.                                                             |
+| [getCreateElementProp](functions/getCreateElementProp.md)                             | Find a statically named property in the props object of a `createElement` call.                                                                          |
+| [getCreateElementPropsObject](functions/getCreateElementPropsObject.md)               | Get the props object (the second argument) of a `createElement` call.                                                                                    |
+| [getCreateElementTypeArgument](functions/getCreateElementTypeArgument.md)             | Get the type argument (the first argument) of a `createElement` call.                                                                                    |
 | [getFullyQualifiedNameEx](functions/getFullyQualifiedNameEx.md)                       | Get the fully qualified name of a symbol, handling cases that `ts.TypeChecker.getFullyQualifiedName` does not handle (ex: `export as namespace preact`). |
 | [getFunctionComponentCollector](functions/getFunctionComponentCollector.md)           | Get an api and visitor object for the rule to collect function components.                                                                               |
 | [getFunctionDirectives](functions/getFunctionDirectives.md)                           | Get the directives of a function (ex: "use strict", "use client", "use server").                                                                         |
@@ -151,6 +155,7 @@
 | [~~isAssignmentToThisState~~](functions/isAssignmentToThisState.md)                   | Check if the assignment expression assigns to `this.state`.                                                                                              |
 | [isBooleanLiteralType](functions/isBooleanLiteralType.md)                             | Check if the type is a boolean literal type.                                                                                                             |
 | [isClassComponent](functions/isClassComponent.md)                                     | Check if the node is a class component (extends `Component` or `PureComponent`).                                                                         |
+| [isCreateElementChildrenArgument](functions/isCreateElementChildrenArgument.md)       | Check if the node is passed as a children argument (the third argument or later) of a `createElement` call.                                              |
 | [isFunctionComponentDefinition](functions/isFunctionComponentDefinition.md)           | Check if the function node is a valid React component definition.                                                                                        |
 | [isFunctionComponentName](functions/isFunctionComponentName.md)                       | Check if a string matches the strict component name pattern.                                                                                             |
 | [isFunctionComponentNameLoose](functions/isFunctionComponentNameLoose.md)             | Check if a string matches the loose component name pattern.                                                                                              |
@@ -165,6 +170,7 @@
 | [isHookId](functions/isHookId.md)                                                     | Checks if the given node is a hook identifier.                                                                                                           |
 | [isHookName](functions/isHookName.md)                                                 | Check if the name is a hook name (starts with `use` followed by an uppercase letter or digit).                                                           |
 | [isHookTag](functions/isHookTag.md)                                                   | Checks if the given expression is a hook tag (callee / tagged template tag).                                                                             |
+| [isInsideCreateElementProps](functions/isInsideCreateElementProps.md)                 | Check if the node is inside the props object (the second argument) of a `createElement` call.                                                            |
 | [isJsxLike](functions/isJsxLike.md)                                                   | Check if the node represents JSX-like content based on heuristics.                                                                                       |
 | [~~isPureComponent~~](functions/isPureComponent.md)                                   | Check if the node is a pure component (extends `PureComponent`).                                                                                         |
 | [isRenderMethodCallback](functions/isRenderMethodCallback.md)                         | Check if the function is a callback passed to a class component's render method.                                                                         |

packages/core/docs/functions/getCreateElementChildrenArguments.md

@@ -0,0 +1,22 @@
+[@eslint-react/core](../README.md) / getCreateElementChildrenArguments
+
+# Function: getCreateElementChildrenArguments()
+
+```ts
+function getCreateElementChildrenArguments(context: RuleContext, node: Node | null): CallExpressionArgument[];
+```
+
+Get the children arguments (the arguments after the props object) of a `createElement` call.
+
+## Parameters
+
+| Parameter | Type             | Description              |
+| --------- | ---------------- | ------------------------ |
+| `context` | `RuleContext`    | The ESLint rule context. |
+| `node`    | `Node` \| `null` | The node to inspect.     |
+
+## Returns
+
+`CallExpressionArgument`[]
+
+The children arguments, or an empty array when the node is not a `createElement` call.

packages/core/docs/functions/getCreateElementProp.md

@@ -0,0 +1,38 @@
+[@eslint-react/core](../README.md) / getCreateElementProp
+
+# Function: getCreateElementProp()
+
+```ts
+function getCreateElementProp(
+  context: RuleContext,
+  node: Node | null,
+  name: string,
+): Property | null;
+```
+
+Find a statically named property in the props object of a `createElement` call.
+
+Statically resolvable names include plain identifier keys as well as
+string-literal and simple template-literal keys (computed or not).
+
+## Parameters
+
+| Parameter | Type             | Description                                                |
+| --------- | ---------------- | ---------------------------------------------------------- |
+| `context` | `RuleContext`    | The ESLint rule context.                                   |
+| `node`    | `Node` \| `null` | The node to inspect.                                       |
+| `name`    | `string`         | The property name to look for (ex: `"children"`, `"key"`). |
+
+## Returns
+
+`Property` \| `null`
+
+The matching `Property` node, or `null` when the call has no static property with that name.
+
+## Example
+
+```ts
+import { getCreateElementProp } from "@eslint-react/core";
+
+const childrenProp = getCreateElementProp(context, node, "children");
+```

packages/core/docs/functions/getCreateElementPropsObject.md

@@ -0,0 +1,26 @@
+[@eslint-react/core](../README.md) / getCreateElementPropsObject
+
+# Function: getCreateElementPropsObject()
+
+```ts
+function getCreateElementPropsObject(context: RuleContext, node: Node | null): ObjectExpression | null;
+```
+
+Get the props object (the second argument) of a `createElement` call.
+
+Type expressions and chain expressions wrapping the argument are unwrapped
+before the object check; `null`, spread, or otherwise non-object props
+arguments yield `null`.
+
+## Parameters
+
+| Parameter | Type             | Description              |
+| --------- | ---------------- | ------------------------ |
+| `context` | `RuleContext`    | The ESLint rule context. |
+| `node`    | `Node` \| `null` | The node to inspect.     |
+
+## Returns
+
+`ObjectExpression` \| `null`
+
+The props `ObjectExpression`, or `null` when absent or not statically an object literal.

packages/core/docs/functions/getCreateElementTypeArgument.md

@@ -0,0 +1,22 @@
+[@eslint-react/core](../README.md) / getCreateElementTypeArgument
+
+# Function: getCreateElementTypeArgument()
+
+```ts
+function getCreateElementTypeArgument(context: RuleContext, node: Node | null): CallExpressionArgument | null;
+```
+
+Get the type argument (the first argument) of a `createElement` call.
+
+## Parameters
+
+| Parameter | Type             | Description              |
+| --------- | ---------------- | ------------------------ |
+| `context` | `RuleContext`    | The ESLint rule context. |
+| `node`    | `Node` \| `null` | The node to inspect.     |
+
+## Returns
+
+`CallExpressionArgument` \| `null`
+
+The type argument, or `null` when the node is not a `createElement` call or has no arguments.

packages/core/docs/functions/isCreateElementChildrenArgument.md

@@ -0,0 +1,23 @@
+[@eslint-react/core](../README.md) / isCreateElementChildrenArgument
+
+# Function: isCreateElementChildrenArgument()
+
+```ts
+function isCreateElementChildrenArgument(context: RuleContext, node: Node): boolean;
+```
+
+Check if the node is passed as a children argument (the third argument or
+later) of a `createElement` call.
+
+## Parameters
+
+| Parameter | Type          | Description              |
+| --------- | ------------- | ------------------------ |
+| `context` | `RuleContext` | The ESLint rule context. |
+| `node`    | `Node`        | The node to check.       |
+
+## Returns
+
+`boolean`
+
+`true` if the node is a direct children argument of a `createElement` call.

packages/core/docs/functions/isInsideCreateElementProps.md

@@ -0,0 +1,22 @@
+[@eslint-react/core](../README.md) / isInsideCreateElementProps
+
+# Function: isInsideCreateElementProps()
+
+```ts
+function isInsideCreateElementProps(context: RuleContext, node: Node): boolean;
+```
+
+Check if the node is inside the props object (the second argument) of a `createElement` call.
+
+## Parameters
+
+| Parameter | Type          | Description              |
+| --------- | ------------- | ------------------------ |
+| `context` | `RuleContext` | The ESLint rule context. |
+| `node`    | `Node`        | The node to check.       |
+
+## Returns
+
+`boolean`
+
+`true` if the node is inside `createElement`'s props object.

packages/core/src/api.test.ts

@@ -4,7 +4,7 @@ import { AST_NODE_TYPES as AST, type TSESTree } from "@typescript-eslint/types";
 import { simpleTraverse } from "@typescript-eslint/typescript-estree";
 import { describe, expect, it } from "vitest";
 
-import { isAPI } from "./api";
+import { isAPI, isAPICall, isCreateElementCall } from "./api";
 
 /**
  * This function mirrors the core matching logic inside `isAPI` from
@@ -267,3 +267,60 @@ describe("isAPI (actual export)", () => {
     testAPI("React.memo;", "createElement", false);
   });
 });
+
+describe("dual signature: curried form (context first)", () => {
+  function createMockContext(code: string): RuleContext {
+    return {
+      sourceCode: {
+        getText: (node: TSESTree.Node) => code.slice(node.range[0], node.range[1]),
+        getScope: () => ({}),
+      },
+    } as unknown as RuleContext;
+  }
+
+  function parseLastExpression(code: string) {
+    const parsed = parseCode(code);
+    const last = parsed.ast.body.at(-1);
+    if (last?.type !== AST.ExpressionStatement) {
+      throw new Error(`expected last statement to be an ExpressionStatement, got ${last?.type ?? "unknown"}`);
+    }
+    return { context: createMockContext(code), node: last.expression };
+  }
+
+  it("isAPI curried form agrees with the two-argument form", () => {
+    const { context, node } = parseLastExpression("React.createElement;");
+    expect(isAPI("createElement")(context, node)).toBe(true);
+    expect(isAPI("createElement")(context)(node)).toBe(true);
+  });
+
+  it("isAPI curried form rejects non-matching nodes", () => {
+    const { context, node } = parseLastExpression("React.memo;");
+    expect(isAPI("createElement")(context, node)).toBe(false);
+    expect(isAPI("createElement")(context)(node)).toBe(false);
+  });
+
+  it("isAPICall curried form agrees with the two-argument form", () => {
+    const { context, node } = parseLastExpression(`React.createElement("div", null);`);
+    expect(isAPICall("createElement")(context, node)).toBe(true);
+    expect(isAPICall("createElement")(context)(node)).toBe(true);
+  });
+
+  it("isAPICall curried form rejects non-matching calls", () => {
+    const { context, node } = parseLastExpression(`React.cloneElement(element);`);
+    expect(isAPICall("createElement")(context, node)).toBe(false);
+    expect(isAPICall("createElement")(context)(node)).toBe(false);
+  });
+
+  it("isAPICall curried form handles null and non-call nodes", () => {
+    const { context, node } = parseLastExpression(`React.createElement("div", null);`);
+    const predicate = isAPICall("createElement")(context);
+    expect(predicate(null)).toBe(false);
+    expect(predicate(node.type === AST.CallExpression ? node.arguments[0] as TSESTree.Node : node)).toBe(false);
+  });
+
+  it("derived predicates (ex: isCreateElementCall) work in curried form", () => {
+    const { context, node } = parseLastExpression(`createElement("div", null);`);
+    expect(isCreateElementCall(context, node)).toBe(true);
+    expect(isCreateElementCall(context)(node)).toBe(true);
+  });
+});

packages/core/src/api.ts

@@ -1,6 +1,5 @@
 import { Extract } from "@eslint-react/ast";
 import type { RuleContext } from "@eslint-react/eslint";
-import { dual } from "@local/eff";
 import { AST_NODE_TYPES as AST, type TSESTree } from "@typescript-eslint/types";
 
 export declare namespace isAPI {
@@ -29,7 +28,12 @@ export function isAPI(api: string): isAPI.ReturnType {
     if (name.endsWith(`.${api}`)) return true;
     return false;
   };
-  return dual(2, func);
+  function dual(context: RuleContext, node: null | TSESTree.Node): boolean;
+  function dual(context: RuleContext): (node: null | TSESTree.Node) => boolean;
+  function dual(context: RuleContext, ...rest: [] | [null | TSESTree.Node]) {
+    return rest.length === 1 ? func(context, rest[0]) : (node: null | TSESTree.Node) => func(context, node);
+  }
+  return dual;
 }
 
 export declare namespace isAPICall {
@@ -51,7 +55,12 @@ export function isAPICall(api: string): isAPICall.ReturnType {
     if (node.type !== AST.CallExpression) return false;
     return isAPI(api)(context, Extract.unwrap(node.callee));
   };
-  return dual(2, func);
+  function dual(context: RuleContext, node: null | TSESTree.Node): node is TSESTree.CallExpression;
+  function dual(context: RuleContext): (node: null | TSESTree.Node) => node is TSESTree.CallExpression;
+  function dual(context: RuleContext, ...rest: [] | [null | TSESTree.Node]) {
+    return rest.length === 1 ? func(context, rest[0]) : (node: null | TSESTree.Node): node is TSESTree.CallExpression => func(context, node);
+  }
+  return dual;
 }
 
 // React API checks