test: add test for exportEqualsDeclarations

src/export-equals-declarations.test.ts

@@ -0,0 +1,129 @@
+import dedent from "ts-dedent";
+import {
+  ModuleKind,
+  ModuleResolutionKind,
+  Project,
+  ScriptTarget,
+} from "ts-morph";
+import { expect, test } from "vitest";
+import { exportEqualsDeclarations } from "./export-equals-declarations";
+
+test("shorthand ambient module", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.d.ts",
+    dedent`
+    declare module 'foo';
+    `,
+  );
+  expect(
+    exportEqualsDeclarations("", indexFile.getModuleOrThrow("'foo'")),
+  ).toStrictEqual([]);
+});
+
+test("export default", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.ts",
+    dedent`
+    export default function() {}
+    `,
+  );
+  expect(exportEqualsDeclarations("", indexFile)).toStrictEqual([]);
+});
+
+test("export equals expression", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.ts",
+    dedent`
+    export = 42;
+    `,
+  );
+  expect(exportEqualsDeclarations("", indexFile)).toStrictEqual([]);
+});
+
+test("export equals identifier", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.ts",
+    dedent`
+    declare function foo(s: string): func1.Interface1;
+    export = foo;
+    `,
+  );
+  expect(exportEqualsDeclarations("", indexFile).at(0)?.exportName).toBe("foo");
+});
+
+test("export equals identifier hidden", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.ts",
+    dedent`
+    /** @internal */
+    declare function foo(s: string): func1.Interface1;
+    export = foo;
+    `,
+  );
+  expect(exportEqualsDeclarations("", indexFile)).toStrictEqual([]);
+});
+
+test("export equals identifier namespace", () => {
+  const project = new Project({
+    useInMemoryFileSystem: true,
+    compilerOptions: {
+      lib: ["lib.esnext.full.d.ts"],
+      target: ScriptTarget.ESNext,
+      module: ModuleKind.ESNext,
+      moduleResolution: ModuleResolutionKind.Bundler,
+    },
+  });
+  const indexFile = project.createSourceFile(
+    "index.ts",
+    dedent`
+    declare namespace foo {};
+    export = foo;
+    `,
+  );
+  expect(exportEqualsDeclarations("", indexFile)).toStrictEqual([]);
+});