vuejs
diff --git a/‎packages/@vue/cli-plugin-unit-jest/presets/typescript/jest-preset.js
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+8-1Lines changed: 8 additions & 1 deletion b/‎packages/@vue/cli-plugin-unit-jest/presets/typescript/jest-preset.js
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+8-1Lines changed: 8 additions & 1 deletion
@@ -1,12 +1,19 @@
 const deepmerge = require('deepmerge')
 const defaultPreset = require('../default/jest-preset')
 
+let tsJest = null
+try {
+  tsJest = require.resolve('ts-jest')
+} catch (e) {
+  throw new Error('Cannot resolve "ts-jest" module. Typescript preset requires "ts-jest" to be installed.')
+}
+
 module.exports = deepmerge(
   defaultPreset,
   {
     moduleFileExtensions: ['ts', 'tsx'],
     transform: {
-      '^.+\\.tsx?$': require.resolve('ts-jest')
+      '^.+\\.tsx?$': tsJest
     }
   }
 )
Original file line number	Diff line number	Diff line change
`@@ -1,12 +1,19 @@`
`1`	`1`	`const deepmerge = require('deepmerge')`
`2`	`2`	`const defaultPreset = require('../default/jest-preset')`
`3`	`3`
	`4`	`+let tsJest = null`
	`5`	`+try {`
	`6`	`+ tsJest = require.resolve('ts-jest')`
	`7`	`+} catch (e) {`
	`8`	`+ throw new Error('Cannot resolve "ts-jest" module. Typescript preset requires "ts-jest" to be installed.')`
	`9`	`+}`
	`10`	`+`
`4`	`11`	`module.exports = deepmerge(`
`5`	`12`	`defaultPreset,`
`6`	`13`	`{`
`7`	`14`	`moduleFileExtensions: ['ts', 'tsx'],`
`8`	`15`	`transform: {`
`9`		`- '^.+\\.tsx?$': require.resolve('ts-jest')`
	`16`	`+ '^.+\\.tsx?$': tsJest`
`10`	`17`	`}`
`11`	`18`	`}`
`12`	`19`	`)`