/
package-exports-test.js
651 lines (594 loc) Β· 22 KB
/
package-exports-test.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict-local
* @format
* @oncall react_native
*/
import path from 'path';
import Resolver from '../index';
import {createPackageAccessors, createResolutionContext} from './utils';
// Tests validating Package Exports resolution behaviour. See RFC0534:
// https://github.com/react-native-community/discussions-and-proposals/blob/master/proposals/0534-metro-package-exports-support.md
//
// '[nonstrict]' tests describe behaviour that is out-of-spec, but which Metro
// supports at feature launch for backwards compatibility. A future strict mode
// for exports will disable these features.
describe('with package exports resolution disabled', () => {
test('should ignore "exports" field for main entry point', () => {
const context = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
main: 'index.js',
exports: './index-exports.js',
}),
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/index-exports.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: false,
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index.js',
});
});
test('should ignore "exports" field for subpaths', () => {
const context = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
main: 'index.js',
exports: {
'./foo.js': './lib/foo.js',
},
}),
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/foo.js': '',
'/root/node_modules/test-pkg/foo.ios.js': '',
'/root/node_modules/test-pkg/lib/foo.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: false,
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/foo.js',
});
expect(Resolver.resolve(context, 'test-pkg/foo', 'ios')).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/foo.ios.js',
});
});
});
describe('with package exports resolution enabled', () => {
describe('main entry point', () => {
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': '',
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/index-main.js': '',
'/root/node_modules/test-pkg/index-exports.js.js': '',
'/root/node_modules/test-pkg/index-exports.ios.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve package using "exports" field', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: {
'.': './index.js',
},
},
}),
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index.js',
});
});
test('should resolve package using "exports" field (shorthand)', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: './index.js',
},
}),
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index.js',
});
});
test('[nonstrict] should fall back to "main" field resolution when file does not exist', () => {
const logWarning = jest.fn();
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: './foo.js',
},
}),
unstable_logWarning: logWarning,
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-main.js',
});
expect(logWarning).toHaveBeenCalledTimes(1);
expect(logWarning.mock.calls[0][0]).toMatchInlineSnapshot(`
"The package /root/node_modules/test-pkg contains an invalid package.json configuration. Consider raising this issue with the package maintainer(s).
Reason: The resolution for \\"/root/node_modules/test-pkg\\" defined in \\"exports\\" is /root/node_modules/test-pkg/foo.js, however this file does not exist."
`);
});
test('[nonstrict] should fall back to "main" field resolution when "exports" is an invalid subpath', () => {
const logWarning = jest.fn();
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: 'index.js',
},
}),
unstable_logWarning: logWarning,
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-main.js',
});
expect(logWarning).toHaveBeenCalledTimes(1);
expect(logWarning.mock.calls[0][0]).toMatchInlineSnapshot(`
"The package /root/node_modules/test-pkg contains an invalid package.json configuration. Consider raising this issue with the package maintainer(s).
Reason: One or more mappings for subpaths defined in \\"exports\\" are invalid. All values must begin with \\"./\\"."
`);
});
describe('should resolve "exports" target directly', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: './index-exports.js',
},
}),
};
test('without expanding `sourceExts`', () => {
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-main.js',
});
});
test('without expanding platform-specific extensions', () => {
expect(Resolver.resolve(context, 'test-pkg', 'ios')).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-main.js',
});
});
});
});
describe('subpath exports', () => {
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
name: 'test-pkg',
main: 'index.js',
exports: {
'.': './index.js',
'./foo.js': './lib/foo.js',
},
}),
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/foo.js': '',
'/root/node_modules/test-pkg/foo.ios.js': '',
'/root/node_modules/test-pkg/lib/foo.js': '',
'/root/node_modules/test-pkg/lib/foo.js.js': '',
'/root/node_modules/test-pkg/lib/foo.ios.js': '',
'/root/node_modules/test-pkg/private/bar.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve subpath in "exports" using exact import specifier', () => {
expect(Resolver.resolve(baseContext, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
});
});
test('[nonstrict] should fall back to "browser" spec resolution and log inaccessible import warning', () => {
expect(Resolver.resolve(baseContext, 'test-pkg/foo', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/foo.js',
});
// TODO(T142200031): Assert inaccessible import warning is logged
});
describe('should resolve "exports" target directly', () => {
test('without expanding `sourceExts`', () => {
expect(Resolver.resolve(baseContext, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
});
});
test('without expanding platform-specific extensions', () => {
expect(Resolver.resolve(baseContext, 'test-pkg/foo.js', 'ios')).toEqual(
{
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
},
);
});
});
describe('package encapsulation', () => {
test('[nonstrict] should fall back to "browser" spec resolution and log inaccessible import warning', () => {
expect(
Resolver.resolve(baseContext, 'test-pkg/private/bar', null),
).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/private/bar.js',
});
// TODO(T142200031): Assert inaccessible import warning is logged
});
test('should not log warning when no "exports" field is present', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
},
}),
};
expect(Resolver.resolve(context, 'test-pkg/private/bar', null)).toEqual(
{
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/private/bar.js',
},
);
// TODO(T142200031): Assert inaccessible import warning is NOT logged
});
});
});
describe('subpath patterns', () => {
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
name: 'test-pkg',
main: 'index.js',
exports: {
'./features/*.js': './src/features/*.js',
'./features/bar/*.js': {
'react-native': null,
},
'./assets/*': './assets/*',
},
}),
'/root/node_modules/test-pkg/src/features/foo.js': '',
'/root/node_modules/test-pkg/src/features/foo.js.js': '',
'/root/node_modules/test-pkg/src/features/bar/Bar.js': '',
'/root/node_modules/test-pkg/src/features/baz.native.js': '',
'/root/node_modules/test-pkg/assets/Logo.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve subpath patterns in "exports" matching import specifier', () => {
for (const [importSpecifier, filePath] of [
[
'test-pkg/features/foo.js',
'/root/node_modules/test-pkg/src/features/foo.js',
],
// Valid: Subpath patterns allow the match to be any substring between
// the pattern base and pattern trailer
[
'test-pkg/features/foo.js.js',
'/root/node_modules/test-pkg/src/features/foo.js.js',
],
[
'test-pkg/features/bar/Bar.js',
'/root/node_modules/test-pkg/src/features/bar/Bar.js',
],
]) {
expect(Resolver.resolve(baseContext, importSpecifier, null)).toEqual({
type: 'sourceFile',
filePath,
});
}
expect(() =>
Resolver.resolve(baseContext, 'test-pkg/features/foo', null),
).toThrowError();
expect(() =>
Resolver.resolve(baseContext, 'test-pkg/features/baz.js', null),
).toThrowError();
});
test('should use most specific pattern base', () => {
const context = {
...baseContext,
unstable_conditionNames: ['react-native'],
};
// TODO(T145206395): Improve this error trace
expect(() =>
Resolver.resolve(context, 'test-pkg/features/bar/Bar.js', null),
).toThrowErrorMatchingInlineSnapshot(`
"Module does not exist in the Haste module map or in these directories:
/root/src/node_modules
/root/node_modules
/node_modules
"
`);
});
test('[nonstrict] should fall back to "browser" spec resolution and log inaccessible import warning', () => {
expect(
Resolver.resolve(baseContext, 'test-pkg/assets/Logo.js', null),
).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/assets/Logo.js',
});
// TODO(T142200031): Assert inaccessible import warning is logged
});
});
describe('conditional exports', () => {
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
name: 'test-pkg',
main: 'index.js',
exports: {
'./foo.js': {
import: './lib/foo-module.mjs',
development: './lib/foo-dev.js',
'react-native': {
import: './lib/foo-react-native.mjs',
require: './lib/foo-react-native.cjs',
default: './lib/foo-react-native.js',
},
browser: './lib/foo-browser.js',
require: './lib/foo-require.cjs',
default: './lib/foo.js',
},
},
}),
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/lib/foo.js': '',
'/root/node_modules/test-pkg/lib/foo-require.cjs': '',
'/root/node_modules/test-pkg/lib/foo-module.mjs': '',
'/root/node_modules/test-pkg/lib/foo-dev.js': '',
'/root/node_modules/test-pkg/lib/foo-browser.js': '',
'/root/node_modules/test-pkg/lib/foo-react-native.cjs': '',
'/root/node_modules/test-pkg/lib/foo-react-native.mjs': '',
'/root/node_modules/test-pkg/lib/foo-react-native.js': '',
'/root/node_modules/test-pkg/lib/foo.web.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve "exports" subpath with conditions', () => {
const context = {
...baseContext,
unstable_conditionNames: ['require', 'react-native'],
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo-react-native.cjs',
});
});
test('should resolve "exports" subpath with nested conditions', () => {
const context = {
...baseContext,
unstable_conditionNames: ['require', 'react-native'],
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo-react-native.cjs',
});
});
test('should resolve asserted conditions in order specified by package', () => {
const context = {
...baseContext,
unstable_conditionNames: ['react-native', 'import'],
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo-module.mjs',
});
});
test('should fall back to "default" condition if present', () => {
const context = {
...baseContext,
unstable_conditionNames: [],
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
});
});
test('should throw FailedToResolvePathError when no conditions are matched', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index.js',
exports: {
'./foo.js': {
import: './lib/foo-module.mjs',
require: './lib/foo-require.cjs',
// 'default' entry can be omitted
},
},
},
}),
unstable_conditionNames: [],
};
// TODO(T145206395): Improve this error trace
expect(() => Resolver.resolve(context, 'test-pkg/foo.js', null))
.toThrowErrorMatchingInlineSnapshot(`
"Module does not exist in the Haste module map or in these directories:
/root/src/node_modules
/root/node_modules
/node_modules
"
`);
});
describe('unstable_conditionsByPlatform', () => {
test('should resolve "browser" condition for `web` platform when configured', () => {
const context = {
...baseContext,
unstable_conditionNames: [],
unstable_conditionsByPlatform: {
web: ['browser'],
},
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
});
expect(Resolver.resolve(context, 'test-pkg/foo.js', 'web')).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo-browser.js',
});
});
test('should resolve using overridden per-platform conditions', () => {
const context = {
...baseContext,
unstable_conditionNames: [],
unstable_conditionsByPlatform: {
web: ['development', 'browser'],
},
};
expect(Resolver.resolve(context, 'test-pkg/foo.js', 'web')).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo-dev.js',
});
expect(
Resolver.resolve(
{...context, unstable_conditionsByPlatform: {}},
'test-pkg/foo.js',
'web',
),
).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/lib/foo.js',
});
});
});
describe('main entry point', () => {
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': '',
'/root/node_modules/test-pkg/index.js': '',
'/root/node_modules/test-pkg/index-browser.js': '',
}),
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve main entry point using conditional exports', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: {
'.': {
browser: './index-browser.js',
default: './index.js',
},
},
},
}),
unstable_conditionNames: ['browser', 'import', 'require'],
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-browser.js',
});
});
test('should resolve main entry point when root keys are a condition mapping (shorthand)', () => {
const context = {
...baseContext,
...createPackageAccessors({
'/root/node_modules/test-pkg/package.json': {
main: 'index-main.js',
exports: {
browser: './index-browser.js',
default: './index.js',
},
},
}),
unstable_conditionNames: ['browser', 'import', 'require'],
};
expect(Resolver.resolve(context, 'test-pkg', null)).toEqual({
type: 'sourceFile',
filePath: '/root/node_modules/test-pkg/index-browser.js',
});
});
});
});
describe('asset resolutions', () => {
const assetResolutions = ['1', '1.5', '2', '3', '4'];
const isAssetFile = (filePath: string) => filePath.endsWith('.png');
const baseContext = {
...createResolutionContext({
'/root/src/main.js': '',
'/root/node_modules/test-pkg/package.json': JSON.stringify({
main: './index.js',
exports: {
'./icons/metro.png': './assets/icons/metro.png',
},
}),
'/root/node_modules/test-pkg/assets/icons/metro.png': '',
'/root/node_modules/test-pkg/assets/icons/metro@2x.png': '',
'/root/node_modules/test-pkg/assets/icons/metro@3x.png': '',
}),
isAssetFile,
originModulePath: '/root/src/main.js',
unstable_enablePackageExports: true,
};
test('should resolve assets using "exports" field and calling `resolveAsset`', () => {
const resolveAsset = jest.fn(
(dirPath: string, basename: string, extension: string) => {
const basePath = dirPath + path.sep + basename;
const assets = [
basePath + extension,
...assetResolutions.map(
resolution => basePath + '@' + resolution + 'x' + extension,
),
].filter(candidate => baseContext.doesFileExist(candidate));
return assets.length ? assets : null;
},
);
const context = {
...baseContext,
resolveAsset,
};
expect(
Resolver.resolve(context, 'test-pkg/icons/metro.png', null),
).toEqual({
type: 'assetFiles',
filePaths: [
'/root/node_modules/test-pkg/assets/icons/metro.png',
'/root/node_modules/test-pkg/assets/icons/metro@2x.png',
'/root/node_modules/test-pkg/assets/icons/metro@3x.png',
],
});
expect(resolveAsset).toHaveBeenLastCalledWith(
'/root/node_modules/test-pkg/assets/icons',
'metro',
'.png',
);
});
});
});