oxc-project__oxc/napi/parser/test/esm.test.ts

import { describe, expect, test } from "vitest";

import { parseSync } from "../src-js/index.js";

describe("esm", () => {
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#syntax
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export#syntax
  const code = `
import defaultExport from "module-name";
import * as name from "module-name";
import { export1 } from "module-name";
import { export1 as alias1 } from "module-name";
import { default as alias } from "module-name";
import { export1, export2 } from "module-name";
import { export1, export2 as alias2, /* … */ } from "module-name";
import { "string name" as alias } from "module-name";
import defaultExport, { export1, /* … */ } from "module-name";
import defaultExport, * as name from "module-name";
import "module-name";

export let name1, name2/*, … */; // also var
export const name1 = 1, name2 = 2/*, … */; // also var, let
export function functionName() { /* … */ }
export class ClassName { /* … */ }
export function* generatorFunctionName() { /* … */ }
export const { name1, name2: bar } = o;
export const [ name1, name2 ] = array;

export { name1, /* …, */ nameN };
export { variable1 as name1, variable2 as name2, /* …, */ nameN };
export { variable1 as "string name" };
export { name1 as default /*, … */ };

export default expression;
export default function functionName() { /* … */ }
export default class ClassName { /* … */ }
export default function* generatorFunctionName() { /* … */ }
export default function () { /* … */ }
export default class { /* … */ }
export default function* () { /* … */ }

export * from "module-name";
export * as name1 from "module-name";
export { name1, /* …, */ nameN } from "module-name";
export { import1 as name1, import2 as name2, /* …, */ nameN } from "module-name";
export { default, /* …, */ } from "module-name";
export { default as name1 } from "module-name";
`
    .split("\n")
    .map((s) => s.trim())
    .filter(Boolean);

  test.each(code)("%s", (s) => {
    const ret = parseSync("test.js", s);
    expect(ret.program.body.length).toBeGreaterThan(0);
    expect(ret.errors.length).toBe(0);
    expect(JSON.stringify(ret.module, null, 2)).toMatchSnapshot();
    expect(ret.module.hasModuleSyntax).toBe(true);

    // oxlint-disable jest/no-conditional-expect
    if (s.startsWith("import")) {
      expect(ret.module.staticImports.length).toBe(1);
      expect(ret.module.staticExports.length).toBe(0);
    }
    if (s.startsWith("export")) {
      expect(ret.module.staticImports.length).toBe(0);
      expect(ret.module.staticExports.length).toBe(1);
    }
    // oxlint-enable jest/no-conditional-expect
  });
});

describe("hasModuleSyntax", () => {
  test("import.meta", () => {
    const ret = parseSync("test.js", "import.meta.foo");
    expect(ret.module.hasModuleSyntax).toBe(true);
    expect(ret.module.importMetas).toEqual([{ start: 0, end: 11 }]);
  });

  test("import expression", () => {
    const ret = parseSync("test.js", "import('foo')");
    expect(ret.module.hasModuleSyntax).toBe(false);
    expect(ret.module.dynamicImports).toStrictEqual([
      { start: 0, end: 13, moduleRequest: { start: 7, end: 12 } },
    ]);
  });

  test("script", () => {
    const ret = parseSync("test.js", "require('foo')");
    expect(ret.module.hasModuleSyntax).toBe(false);
  });
});

describe("export type", () => {
  const inputs = [
    ["export type * from 'mod'", true],
    ["export type * as ns from 'mod'", true],
    ["export type { foo }", true],
    ["export { type foo }", true],
    ["export type { foo } from 'mod'", true],
    ["export type Foo = {}", true],
    ["export interface Foo {}", true],
    ["export default interface Foo {}", true],
    ["export namespace Foo {}", false], // namespace isn't considered a typed export
  ] as const;
  test.each(inputs)("%s", (source, isType) => {
    const ret = parseSync("test.ts", source);
    expect(ret.module.staticExports.length).toBe(1);
    expect(ret.module.staticExports[0].entries.length).toBe(1);
    expect(ret.module.staticExports[0].entries[0].isType).toBe(isType);
  });
});