feat(nodes): NullLiteral

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

src/nodes/__tests__/literal-null.spec-d.ts

@@ -0,0 +1,21 @@
+/**
+ * @file Type Tests - NullLiteral
+ * @module esast/nodes/tests/unit-d/NullLiteral
+ */
+
+import type { Literal } from '@flex-development/esast'
+import type TestSubject from '../literal-null'
+
+describe('unit-d:nodes/NullLiteral', () => {
+  it('should extend Literal', () => {
+    expectTypeOf<TestSubject>().toMatchTypeOf<Literal>()
+  })
+
+  it('should match [type: "null"]', () => {
+    expectTypeOf<TestSubject>().toHaveProperty('type').toEqualTypeOf<'null'>()
+  })
+
+  it('should match [value: null]', () => {
+    expectTypeOf<TestSubject>().toHaveProperty('value').toEqualTypeOf<null>()
+  })
+})

src/nodes/index.ts

@@ -7,4 +7,5 @@
 export type { default as Literal } from './literal'
 export type { default as BigIntLiteral } from './literal-bigint'
 export type { default as BooleanLiteral } from './literal-boolean'
+export type { default as NullLiteral } from './literal-null'
 export type { default as Node } from './node'

src/nodes/literal-null.ts

@@ -0,0 +1,27 @@
+/**
+ * @file Nodes - NullLiteral
+ * @module esast/nodes/NullLiteral
+ */
+
+import type { Literal } from '@flex-development/esast'
+
+/**
+ * The value `null`.
+ *
+ * @see {@linkcode Literal}
+ *
+ * @extends {Literal}
+ */
+interface NullLiteral extends Literal {
+  /**
+   * Node type.
+   */
+  type: 'null'
+
+  /**
+   * Plain value.
+   */
+  value: null
+}
+
+export type { NullLiteral as default }