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fix: gracefully load @babel/core or babel-core
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| import { | ||
| TBabel, | ||
| TBabelPresetEnv, | ||
| TBabelPluginIstanbul, | ||
| TBabelPresetJest, | ||
| } from '../types'; | ||
|
|
||
| export function importBabelCore(): TBabel { | ||
| const mod = tryRequire('@babel/core') || tryRequire('babel-core'); | ||
| if (!mod) { | ||
| throw new Error( | ||
| `[ts-jest] You must install the '@babel/core' or 'babel-core'` + | ||
| ` package (depending on the version you want to use).`, | ||
| ); | ||
| } | ||
| return mod; | ||
| } | ||
|
|
||
| export function importBabelPresetEnv(): TBabelPresetEnv { | ||
| const mod = tryRequire('@babel/preset-env') || tryRequire('babel-preset-env'); | ||
| if (!mod) { | ||
| throw new Error( // babel-jest has the env preset as a dep | ||
| `[ts-jest] You must install the 'babel-jest' package if you're using babel.`, | ||
| ); | ||
| } | ||
| return mod; | ||
| } | ||
|
|
||
| export function importBabelPresetJest(): TBabelPresetJest { | ||
| const mod = tryRequire('babel-preset-jest'); | ||
| if (!mod) { | ||
| throw new Error( // babel-jest has the jest preset as a dep | ||
| `[ts-jest] You must install the 'babel-jest' package if you're using babel.`, | ||
| ); | ||
| } | ||
| return mod; | ||
| } | ||
|
|
||
| export function importBabelPluginIstanbul(): TBabelPluginIstanbul { | ||
| const mod = tryRequire('babel-plugin-istanbul'); | ||
| if (!mod) { | ||
| throw new Error( // babel-jest has the istanbul plugin as a dep | ||
| `[ts-jest] You must install the 'babel-jest' package if you're using babel.`, | ||
| ); | ||
| } | ||
| return mod.default; | ||
| } | ||
|
|
||
| function tryRequire<T = any>(packageName: string): T | void { | ||
| let mod: T; | ||
| try { | ||
| mod = require(packageName); | ||
| } catch (err) { | ||
| if (err.code !== 'ENOENT') throw err; // tslint:disable-line | ||
| } | ||
| return mod; | ||
| } |
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