refactor(transformers): deprecate path-mapping AST transformer

e2e/__tests__/ast-transformers.test.ts

@@ -21,27 +21,6 @@ const executeTest = (testDir: string): void => {
   })
 }
 
-describe('path-mapping', () => {
-  const PATH_MAPPING_DIR_NAME = 'path-mapping'
-
-  describe('ts-4.5+', () => {
-    executeTest(`${AST_TRANSFORMERS_DIR_NAME}/${PATH_MAPPING_DIR_NAME}/ts-4.5+`)
-  })
-
-  describe('ts-4.5-', () => {
-    const DIR = path.join(__dirname, '..', AST_TRANSFORMERS_DIR_NAME, PATH_MAPPING_DIR_NAME, 'ts-4.5-')
-
-    beforeAll(() => {
-      runNpmInstall(DIR)
-      execa.sync('npm', ['install', '--no-package-lock', '--no-shrinkwrap', '--no-save', tsJestBundle], {
-        cwd: DIR,
-      })
-    })
-
-    executeTest(`${AST_TRANSFORMERS_DIR_NAME}/${PATH_MAPPING_DIR_NAME}/ts-4.5-`)
-  })
-})
-
 describe('transformer-options', () => {
   const TRANSFORM_OPT_DIR_NAME = 'transformer-options'
 

src/transformers/path-mapping.ts

@@ -28,6 +28,9 @@ export function factory({
   configSet,
 }: TsCompilerInstance): (ctx: _ts.TransformationContext) => _ts.Transformer<_ts.SourceFile> {
   const logger = configSet.logger.child({ namespace: name })
+  logger.warn(
+    'path-mapping AST transformer is deprecated and will be removed in `ts-jest` v28. Please use an alternative one, like https://github.com/LeDDGroup/typescript-transform-paths instead',
+  )
   const ts = configSet.compilerModule
   const tsFactory = ts.factory ? ts.factory : ts
   const compilerOptions = configSet.parsedTsConfig.options