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feat(cli): CLI 'config:migrate' now detects best preset
When invoquing the CLI command `config:migrate`, it'll now be able to
detect the best preset to be used.
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huafu committed Sep 25, 2018
1 parent f55d895 commit febd8d3
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Showing 2 changed files with 60 additions and 14 deletions.
2 changes: 1 addition & 1 deletion presets/index.js
@@ -1,4 +1,4 @@
const create = './create'
const create = require('./create')

module.exports = {
get defaults() { return create() },
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72 changes: 59 additions & 13 deletions src/cli/config/migrate.ts
Expand Up @@ -6,16 +6,19 @@ import { basename, resolve } from 'path'
import { Arguments } from 'yargs'

import { CliCommand } from '..'
import { createJestPreset } from '../../config/create-jest-preset'
import { TsJestPresets } from '../../types'
import { backportJestConfig } from '../../util/backports'

const DEFAULT_PRESET = 'ts-jest/presets/default'

/**
* @internal
*/
export const run: CliCommand = async (args: Arguments /*, logger: Logger*/) => {
const nullLogger = createLogger({ targets: [] })
const file = args._[0]
const filePath = resolve(process.cwd(), file)
const footNotes: string[] = []
if (!existsSync(filePath)) {
throw new Error(`Configuration file ${file} does not exists.`)
}
Expand All @@ -33,29 +36,71 @@ export const run: CliCommand = async (args: Arguments /*, logger: Logger*/) => {
// migrate
// first we backport our options
const migratedConfig = backportJestConfig(nullLogger, actualConfig)
let presetName: string | undefined
// then we check if we can use `preset`
if (!migratedConfig.preset && args.jestPreset) {
migratedConfig.preset = 'ts-jest'
} else if (!args.jestPreset && migratedConfig.preset === 'ts-jest') {
delete migratedConfig.preset
// find the best preset
if (args.allowJs) presetName = 'ts-jest/presets/js-with-ts'
else {
// try to detect what transformer the js extensions would target
const jsTransformers = Object.keys(migratedConfig.transform || {}).reduce(
(list, pattern) => {
if (RegExp(pattern.replace(/^<rootDir>\/?/, '/dummy-project/')).test('/dummy-project/src/foo.js')) {
let transformer: string = (migratedConfig.transform as any)[pattern]
if (/\bbabel-jest\b/.test(transformer)) transformer = 'babel-jest'
else if (/\ts-jest\b/.test(transformer)) transformer = 'ts-jest'
return [...list, transformer]
}
return list
},
[] as string[],
)
// depending on the transformer found, we use one or the other preset
const jsWithTs = jsTransformers.includes('ts-jest')
const jsWithBabel = jsTransformers.includes('babel-jest')
if (jsWithBabel && !jsWithTs) {
presetName = 'ts-jest/presets/js-with-babel'
} else if (jsWithTs && !jsWithBabel) {
presetName = 'ts-jest/presets/js-with-ts'
} else {
// sounds like js files are NOT handled, or handled with a unknown transformer, so we do not need to handle it
presetName = DEFAULT_PRESET
}
}
// ensure we are using a preset
presetName = presetName || DEFAULT_PRESET
migratedConfig.preset = presetName
footNotes.push(
`Detected preset '${presetName.replace(
/^ts-jest\/presets\//,
'',
)}' as the best matching preset for your configuration.\nVisit https://kulshekhar.github.io/ts-jest/user/config/#jest-preset for more information about presets.\n`,
)
} else if (migratedConfig.preset && migratedConfig.preset.startsWith('ts-jest')) {
if (args.jestPreset === false) {
delete migratedConfig.preset
} else {
presetName = migratedConfig.preset
}
}
const usesPreset = migratedConfig.preset === 'ts-jest'
const presets = createJestPreset({ allowJs: args.allowJs })
const presets: TsJestPresets | undefined = presetName
? require(`../../../${presetName.replace(/^ts-jest\//, '')}/jest-preset`)
: undefined

// check the extensions
if (migratedConfig.moduleFileExtensions && migratedConfig.moduleFileExtensions.length && usesPreset) {
if (migratedConfig.moduleFileExtensions && migratedConfig.moduleFileExtensions.length && presets) {
const presetValue = dedupSort(presets.moduleFileExtensions).join('::')
const migratedValue = dedupSort(migratedConfig.moduleFileExtensions).join('::')
if (presetValue === migratedValue) {
delete migratedConfig.moduleFileExtensions
}
}
// there is a testRegex, remove our testMatch
if (migratedConfig.testRegex && usesPreset) {
if (migratedConfig.testRegex && presets) {
migratedConfig.testMatch = null as any
}
// check the testMatch
else if (migratedConfig.testMatch && migratedConfig.testMatch.length && usesPreset) {
else if (migratedConfig.testMatch && migratedConfig.testMatch.length && presets) {
const presetValue = dedupSort(presets.testMatch).join('::')
const migratedValue = dedupSort(migratedConfig.testMatch).join('::')
if (presetValue === migratedValue) {
Expand All @@ -75,7 +120,7 @@ export const run: CliCommand = async (args: Arguments /*, logger: Logger*/) => {
}
// check if it's the same as the preset's one
if (
usesPreset &&
presets &&
migratedConfig.transform &&
stringifyJson(migratedConfig.transform) === stringifyJson(presets.transform)
) {
Expand All @@ -95,7 +140,7 @@ No migration needed for given Jest configuration
}

const stringify = /\.json$/.test(file) ? JSON.stringify : stringifyJson5
const footNotes: string[] = []
const prefix = /\.json$/.test(file) ? '"jest": ' : 'module.exports = '

// if we are using preset, inform the user that he might be able to remove some section(s)
// we couldn't check for equality
Expand All @@ -109,7 +154,7 @@ No migration needed for given Jest configuration
// If it is the case, you can safely remove the "testMatch" from what I've migrated.
// `)
// }
if (usesPreset && migratedConfig.transform) {
if (presets && migratedConfig.transform) {
footNotes.push(`
I couldn't check if your "transform" value is the same as mine which is: ${stringify(
presets.transform,
Expand All @@ -124,7 +169,7 @@ If it is the case, you can safely remove the "transform" from what I've migrated
process.stderr.write(`
Migrated Jest configuration:
`)
process.stdout.write(`${stringify(migratedConfig, undefined, ' ')}\n`)
process.stdout.write(`${prefix}${stringify(migratedConfig, undefined, ' ')}\n`)
if (footNotes.length) {
process.stderr.write(`
${footNotes.join('\n')}
Expand Down Expand Up @@ -152,6 +197,7 @@ function cleanupConfig(config: jest.InitialOptions): void {
config.testMatch = dedupSort(config.testMatch)
if (config.testMatch.length === 0) delete config.testMatch
}
if (config.preset === DEFAULT_PRESET) config.preset = 'ts-jest'
}

function dedupSort(arr: any[]) {
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