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import * as ts from "typescript";

import * as util from "../../util";

describe("module import/export elision", () => {

const moduleDeclaration = `

declare module "module" {

export type Type = string;

export declare const value: string;

}

`;

const expectToElideImport: util.TapCallback = builder => {

builder.addExtraFile("module.d.ts", moduleDeclaration).setOptions({ module: ts.ModuleKind.CommonJS });

expect(builder.getLuaExecutionResult()).not.toBeInstanceOf(util.ExecutionError);

};

test("should elide named type imports", () => {

util.testModule`

import { Type } from "module";

const foo: Type = "bar";

`.tap(expectToElideImport);

});

test("should elide named value imports used only as a type", () => {

util.testModule`

import { value } from "module";

const foo: typeof value = "bar";

`.tap(expectToElideImport);

});

test("should elide namespace imports with unused values", () => {

util.testModule`

import * as module from "module";

const foo: module.Type = "bar";

`.tap(expectToElideImport);

});

test("should elide `import =` declarations", () => {

util.testModule`

import module = require("module");

const foo: module.Type = "bar";

`.tap(expectToElideImport);

});

test("should elide type exports", () => {

util.testModule`

(globalThis as any).foo = true;

type foo = boolean;

export { foo };

`.expectToEqual([]);

});

});

test.each(["ke-bab", "dollar$", "singlequote'", "hash#", "s p a c e", "ɥɣɎɌͼƛಠ", "_̀ः٠‿"])(

"Import module names with invalid lua identifier characters (%p)",

name => {

util.testModule`

import { foo } from "./${name}";

export { foo };

`

.addExtraFile(`${name}.ts`, 'export const foo = "bar";')

.setReturnExport("foo")

.expectToEqual("bar");

}

);

test.each(["export default value;", "export { value as default };"])("Export Default From (%p)", exportStatement => {

util.testModule`

export { default } from "./module";

`

.addExtraFile(

"module.ts",

`

export const value = true;

${exportStatement};

`

)

.expectToMatchJsResult();

});

test("Default Import and Export Expression", () => {

util.testModule`

import defaultExport from "./module";

export const value = defaultExport;

`

.addExtraFile(

"module.ts",

`

export default 1 + 2 + 3;

`

)

.expectToMatchJsResult();

});

test("Import and Export Assignment", () => {

util.testModule`

import m = require("./module");

export const value = m;

`

.setOptions({ module: ts.ModuleKind.CommonJS })

.addExtraFile(

"module.ts",

`

export = true;

`

)

.expectToMatchJsResult();

});

test("Mixed Exports, Default and Named Imports", () => {

util.testModule`

import defaultExport, { a, b, c } from "./module";

export const value = defaultExport + b + c;

`

.addExtraFile(

"module.ts",

`

export const a = 1;

export const b = 2;

export const c = 3;

export default a;

`

)

.expectToMatchJsResult();

});

test("Mixed Exports, Default and Namespace Import", () => {

util.testModule`

import defaultExport, * as ns from "./module";

export const value = defaultExport + ns.b + ns.c;

`

.addExtraFile(

"module.ts",

`

export const a = 1;

export const b = 2;

export const c = 3;

export default a;

`

)

.expectToMatchJsResult();

});

test("Export Default Function", () => {

const mainCode = `

import defaultExport from "./module";

export const value = defaultExport();

`;

util.testModule(mainCode)

.addExtraFile(

"module.ts",

`

export default function() {

return true;

}

`

)

.expectToMatchJsResult();

});

test("Export Equals", () => {

util.testModule`

export = true;

`

.setOptions({ module: ts.ModuleKind.CommonJS })

.expectToMatchJsResult();

});

const reassignmentTestCases = [

"x = 1",

"x++",

"(x = 1)",

"[x] = [1]",

"[[x]] = [[1]]",

"({ x } = { x: 1 })",

"({ y: x } = { y: 1 })",

"({ x = 1 } = { x: undefined })",

];

test.each(reassignmentTestCases)("export specifier with reassignment afterwards (%p)", reassignment => {

util.testModule`

let x = 0;

export { x };

${reassignment};

`.expectToMatchJsResult();

});

test.each(reassignmentTestCases)("export specifier fork (%p)", reassignment => {

util.testModule`

let x = 0;

export { x as a };

export { x as b };

${reassignment};

`.expectToMatchJsResult();

});

test("does not export shadowed identifiers", () => {

util.testModule`

export let a = 1;

{ let a = 2; a = 3 };

`.expectToMatchJsResult();

});

test("export as specifier shouldn't effect local vars", () => {

util.testModule`

let x = false;

export { x as a };

let a = 5;

a = 6;

`.expectToMatchJsResult();

});

test("export modified in for in loop", () => {

util.testModule`

export let foo = '';

for (foo in { x: true }) {}

`

.setReturnExport("foo")

.expectToMatchJsResult();

});

test("export dependency modified in for in loop", () => {

util.testModule`

let foo = '';

export { foo as bar };

for (foo in { x: true }) {}

`

.setReturnExport("bar")

.expectToEqual("x");

});

test("export default class with future reference", () => {

util.testModule`

export default class Default {}

const d = new Default();

export const result = d.constructor.name;

`

.setReturnExport("result")

.expectToMatchJsResult();

});

test("export default function with future reference", () => {

util.testModule`

export default function defaultFunction() {

return true;

}

export const result = defaultFunction();

`

.setReturnExport("result")

.expectToMatchJsResult();

});

const moduleFile = `

export default true;

export const foo = "bar";

`;

test("export all does not include default", () => {

util.testModule`

export * from "./module";

`

.setOptions({ module: ts.ModuleKind.CommonJS })

.addExtraFile("module.ts", moduleFile)

.expectToMatchJsResult();

});

test("namespace export does not include default", () => {

util.testModule`

export * as result from "./module";

`

.addExtraFile("module.ts", moduleFile)

.expectToMatchJsResult();

});

test("namespace export with unsafe Lua name", () => {

util.testModule`

export * as $$$ from "./module";

`

.addExtraFile("module.ts", moduleFile)

.expectToMatchJsResult();

});

test("import expression", () => {

util.testModule`

let result;

import("./module").then(m => { result = m.foo(); });

export { result };

`

.addExtraFile("module.ts", 'export function foo() { return "foo"; }')

.setOptions({ module: ts.ModuleKind.ESNext })

.expectToEqual({ result: "foo" });

});

// https://github.com/TypeScriptToLua/TypeScriptToLua/issues/1572

test("correctly exports @compileMembersOnly enums (#1572)", () => {

util.testModule`

export { val } from "./otherfile";

`

.addExtraFile(

"otherfile.ts",

`

// Would put this in the main file, but we cannot transfer enum types over lua/js boundary

// but we still need to have an exported enum, hence it is in another file

/** @compileMembersOnly */

export enum MyEnum {

A = 0,

B = 1,

C = 2

}

export const val = MyEnum.B | MyEnum.C;

`

)

.expectToEqual({ val: 3 });

});