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language-service.spec.ts
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language-service.spec.ts
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import { LogLevels } from 'bs-logger'
import { readFileSync, renameSync } from 'fs'
import { removeSync } from 'fs-extra'
import { join } from 'path'
import { makeCompiler } from '../__helpers__/fakers'
import { logTargetMock } from '../__helpers__/mocks'
import ProcessedSource from '../__helpers__/processed-source'
const logTarget = logTargetMock()
describe('Language service', () => {
const baseTsJestConfig = { tsConfig: require.resolve('../../tsconfig.spec.json') }
beforeEach(() => {
logTarget.clear()
})
describe('allowJs option', () => {
const fileName = 'test-allow-js.js'
const source = 'export default 42'
it('should compile js file for allowJs true with outDir', () => {
const compiler = makeCompiler({
tsJestConfig: { tsConfig: { allowJs: true, outDir: '$$foo$$' } },
})
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName)).toMatchSnapshot()
})
it('should compile js file for allowJs true without outDir', () => {
const compiler = makeCompiler({
tsJestConfig: { tsConfig: { allowJs: true } },
})
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName)).toMatchSnapshot()
})
})
describe('jsx option', () => {
const fileName = 'test-jsx.tsx'
const source = `
const App = () => {
return <>Test</>
}
`
it('should compile tsx file for jsx preserve', () => {
const compiler = makeCompiler({
tsJestConfig: {
tsConfig: {
jsx: 'preserve' as any,
},
},
})
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName)).toMatchSnapshot()
})
it('should compile tsx file for other jsx options', () => {
const compiler = makeCompiler({
tsJestConfig: {
tsConfig: {
jsx: 'react' as any,
},
},
})
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName)).toMatchSnapshot()
})
})
describe('source maps', () => {
const source = 'const gsm = (v: number) => v\nconst h: number = gsm(5)'
const fileName = 'test-source-map.ts'
it('should have correct source maps without mapRoot', () => {
const compiler = makeCompiler({ tsJestConfig: { tsConfig: require.resolve('../../tsconfig.spec.json') } })
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName).outputSourceMaps).toMatchObject({
file: fileName,
sources: [fileName],
sourcesContent: [source],
})
})
it('should have correct source maps with mapRoot', () => {
const compiler = makeCompiler({
tsJestConfig: {
tsConfig: {
mapRoot: './',
},
},
})
const compiled = compiler.compile(source, fileName)
expect(new ProcessedSource(compiled, fileName).outputSourceMaps).toMatchObject({
file: fileName,
sources: [fileName],
sourcesContent: [source],
})
})
})
describe('module resolution', () => {
it(`should use moduleResolutionCache`, () => {
jest.unmock('typescript')
const ts = require('typescript')
const moduleResolutionCacheMock = (ts.createModuleResolutionCache = jest.fn().mockImplementation(() => {}))
makeCompiler({
tsJestConfig: baseTsJestConfig,
})
expect(moduleResolutionCacheMock).toHaveBeenCalled()
expect(moduleResolutionCacheMock.mock.calls[0].length).toBe(3)
moduleResolutionCacheMock.mockRestore()
})
})
describe('diagnostics', () => {
const importedFileName = require.resolve('../__mocks__/thing.ts')
const importedFileContent = readFileSync(importedFileName, 'utf-8')
it(`should report diagnostics for imported modules as well as test files which use imported modules with cache`, async () => {
const testFileName = require.resolve('../__mocks__/thing1.spec.ts')
const testFileContent = readFileSync(testFileName, 'utf-8')
const cacheDir = join(process.cwd(), 'tmp')
/**
* Run the 1st compilation with Promise resolve setTimeout to stimulate 2 different test runs to test cached
* resolved modules
*/
async function firstCompile() {
return new Promise((resolve) => {
const compiler1 = makeCompiler({
jestConfig: {
cache: true,
cacheDirectory: cacheDir,
},
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler1.compile(testFileContent, testFileName)
// probably 300ms is enough to stimulate 2 separated runs after each other
setTimeout(() => resolve(), 300)
})
}
await firstCompile()
const compiler2 = makeCompiler({
jestConfig: {
cache: true,
cacheDirectory: cacheDir,
},
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler2.compile(importedFileContent, importedFileName)
expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
removeSync(cacheDir)
})
it(`should not report diagnostics for test file which doesn't exist when compiling import module file`, async () => {
const testFileName = require.resolve('../__mocks__/thing.spec.ts')
const testFileContent = readFileSync(testFileName, 'utf-8')
const cacheDir = join(process.cwd(), 'tmp')
/**
* Run the 1st compilation with Promise resolve setTimeout to stimulate 2 different test runs to test cached
* resolved modules
*/
async function firstCompile() {
return new Promise((resolve) => {
const compiler1 = makeCompiler({
jestConfig: {
cache: true,
cacheDirectory: cacheDir,
},
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler1.compile(testFileContent, testFileName)
// probably 300ms is enough to stimulate 2 separated runs after each other
setTimeout(() => resolve(), 300)
})
}
await firstCompile()
const newTestFileName = testFileName.replace('thing', 'thing2')
renameSync(testFileName, newTestFileName)
const compiler2 = makeCompiler({
jestConfig: {
cache: true,
cacheDirectory: cacheDir,
},
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler2.compile(importedFileContent, importedFileName)
expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
renameSync(newTestFileName, testFileName)
removeSync(cacheDir)
})
it(`should only report diagnostics for imported modules but not test files without cache`, () => {
const testFileName = require.resolve('../__mocks__/thing1.spec.ts')
const testFileContent = readFileSync(testFileName, 'utf-8')
const compiler1 = makeCompiler({
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler1.compile(testFileContent, testFileName)
const compiler2 = makeCompiler({
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler2.compile(importedFileContent, importedFileName)
expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
})
it(`shouldn't report diagnostics for test file name that has been type checked before`, () => {
const testFileName = require.resolve('../__mocks__/thing1.spec.ts')
const testFileContent = readFileSync(testFileName, 'utf-8')
const compiler1 = makeCompiler({
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler1.compile(testFileContent, testFileName)
compiler1.compile(importedFileContent, importedFileName)
expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
})
it(`shouldn't report diagnostics when file name doesn't match diagnostic file pattern`, () => {
const compiler = makeCompiler({
tsJestConfig: {
...baseTsJestConfig,
diagnostics: { pathRegex: 'foo.spec.ts' },
},
})
expect(() => compiler.compile(importedFileContent, importedFileName)).not.toThrowError()
})
it(`shouldn't report diagnostic when processing file isn't used by any test files`, () => {
const compiler = makeCompiler({
tsJestConfig: baseTsJestConfig,
})
logTarget.clear()
compiler.compile(importedFileContent, 'foo.ts')
expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
})
it('should throw error when cannot compile', () => {
const fileName = 'test-cannot-compile.d.ts'
const source = `
interface Foo {
a: string
}
`
const compiler = makeCompiler({
tsJestConfig: baseTsJestConfig,
})
expect(() => compiler.compile(source, fileName)).toThrowErrorMatchingSnapshot()
})
})
})