* refactor(config): show warning message for `sourceMap: false` ([#2557](https://github.com/kulshekhar/ts-jest/pull/2557)) ([cf60990](https://github.com/kulshekhar/ts-jest/commit/cf609900e2c5937755123bd08ca2c5f2ff5e0651)).
* **compiler:** return file content on emitSkipped for non ts/tsx files ([#2515](https://github.com/kulshekhar/ts-jest/issues/2515)) ([0320fb3](https://github.com/kulshekhar/ts-jest/commit/0320fb3ac22056aafe4d7ae966eab84dbf23fda9)), closes [#2513](https://github.com/kulshekhar/ts-jest/issues/2513)
* **config:** create fallback jest config when jest config is undefined ([#2421](https://github.com/kulshekhar/ts-jest/issues/2421)) ([0fb6b45](https://github.com/kulshekhar/ts-jest/commit/0fb6b45e7dc3dd7588d27f09ac9a8849dff470cb)), closes [#2085](https://github.com/kulshekhar/ts-jest/issues/2085)
* remove `@types/jest` from direct dep ([#2416](https://github.com/kulshekhar/ts-jest/issues/2416)) ([060302e](https://github.com/kulshekhar/ts-jest/commit/060302ed1eb8708df0acd7ab1d613ff06fc08cf3)), closes [#2406](https://github.com/kulshekhar/ts-jest/issues/2406) [#2411](https://github.com/kulshekhar/ts-jest/issues/2411)
* **compiler:** return original file content on emit skip ([#2408](https://github.com/kulshekhar/ts-jest/issues/2408)) ([cfba8f4](https://github.com/kulshekhar/ts-jest/commit/cfba8f423dd59536d8b1e1374ef2b20bff2ed857)), closes [#2407](https://github.com/kulshekhar/ts-jest/issues/2407)
* **config:** support typed config options for jest config typescript ([#2336](https://github.com/kulshekhar/ts-jest/issues/2336)) ([f4f5d32](https://github.com/kulshekhar/ts-jest/commit/f4f5d3205d1c80e545a32c02c6a66e7e91386f7f))
* **presets:** add typing for `presets` entry point ([#2341](https://github.com/kulshekhar/ts-jest/issues/2341)) ([e12b004](https://github.com/kulshekhar/ts-jest/commit/e12b004dcc5848d5ae0638e885147c54e11cc72b)), closes [#2325](https://github.com/kulshekhar/ts-jest/issues/2325)
* reduce size of `node_modules` when adding `ts-jest` ([#2309](https://github.com/kulshekhar/ts-jest/issues/2309)) ([6bf2e8a](https://github.com/kulshekhar/ts-jest/commit/b8d5d2090567f23947d9efd87f5f869b16bf2e8a))
### Features
* introduce `exclude` to exclude files from diagnostics ([#2308](https://github.com/kulshekhar/ts-jest/issues/2308)) ([cd82fd3](https://github.com/kulshekhar/ts-jest/commit/0c555c250774a7fd9e356cf20a3d8b693cd82fd3))
### DEPRECATIONS
* **config**: deprecate `pathRegex` in favor of `exclude` ([#2308](https://github.com/kulshekhar/ts-jest/issues/2308)) ([cd82fd3](https://github.com/kulshekhar/ts-jest/commit/0c555c250774a7fd9e356cf20a3d8b693cd82fd3))
* **compiler:** only exclude test files when initializing compiler ([#2062](https://github.com/kulshekhar/ts-jest/issues/2062)) ([7264c13](https://github.com/kulshekhar/ts-jest/commit/7264c137114b6dd895624e3476dd7ec57b64ee13)), closes [#2061](https://github.com/kulshekhar/ts-jest/issues/2061), [#2068](https://github.com/kulshekhar/ts-jest/issues/2068), [#2072](https://github.com/kulshekhar/ts-jest/issues/2072), [#2073](https://github.com/kulshekhar/ts-jest/issues/2073)
* **config:** resolve `.babelrc` file path before attempting to read it ([#2071](https://github.com/kulshekhar/ts-jest/issues/2071)) ([681bfef](https://github.com/kulshekhar/ts-jest/commit/681bfef41744f09cd50b71072f4d001cb58da82e)), closes [#2064](https://github.com/kulshekhar/ts-jest/issues/2064)
### Features
* **config:** allow to override resolve tsconfig behavior ([#2063](https://github.com/kulshekhar/ts-jest/issues/2063)) ([9f46ace](https://github.com/kulshekhar/ts-jest/commit/9f46acefceb1fa71ee2e8b3b3c172ceb0544b4c4))
* **config:** expose several typings as public apis ([#2054](https://github.com/kulshekhar/ts-jest/issues/2054)) ([3b6b705](https://github.com/kulshekhar/ts-jest/commit/3b6b7055e2b9c74e81fb91596c807ace02ab77a1))
### Performance Improvements
* **compiler:** speed up bootstrap time for `isolatedModules:false` ([#2055](https://github.com/kulshekhar/ts-jest/issues/2055)) ([230b5dd](https://github.com/kulshekhar/ts-jest/commit/230b5ddbee55357d25dd190cd45aa8a30d7f31e0))
### DEPRECATIONS
* **config**: deprecate `tsConfig` in favor of `tsconfig` ([#1997](https://github.com/kulshekhar/ts-jest/pull/1997))
* **config**: deprecate `packageJson` since internal codes don't use it anymore ([#2034](https://github.com/kulshekhar/ts-jest/pull/2034))
* set minimum `jest-util` version at 26.1.0 ([#1914](https://github.com/kulshekhar/ts-jest/issues/1914)) ([f00414c](https://github.com/kulshekhar/ts-jest/commit/f00414c6fbf8fc5413fd33d0a271c4a164c50d45)), closes [#1913](https://github.com/kulshekhar/ts-jest/issues/1913)
* **transformers:** support hoisting when using `@jest/globals` ([#1937](https://github.com/kulshekhar/ts-jest/issues/1937)) ([0e5be15](https://github.com/kulshekhar/ts-jest/commit/0e5be1597d755fed11869f67df05eeea54b3106f)), closes [#1593](https://github.com/kulshekhar/ts-jest/issues/1593)
* move `@types/jest` to dependencies to work well with yarn 2 ([#1859](https://github.com/kulshekhar/ts-jest/issues/1859)) ([5eb1389](https://github.com/kulshekhar/ts-jest/commit/5eb1389caaa0431e49ae6ca26b18e290208e0a0a)), closes [#1857](https://github.com/kulshekhar/ts-jest/issues/1857)
### Features
* **config:** support `after` and `afterDeclarations` AST transformers ([#1831](https://github.com/kulshekhar/ts-jest/issues/1831)) ([be20a7c](https://github.com/kulshekhar/ts-jest/commit/be20a7c78c97027b33aec178da0f533095790871))
* allow opt-out version warning message by environment variable `TS_JEST_DISABLE_VER_CHECKER` ([#1821](https://github.com/kulshekhar/ts-jest/issues/1821)) ([e6b42fc](https://github.com/kulshekhar/ts-jest/commit/e6b42fcd7a75c7b14e636a45cda04de18a46908b)), closes [#1774](https://github.com/kulshekhar/ts-jest/issues/1774)
* **compiler:** check if test file exists before doing type check ([#1827](https://github.com/kulshekhar/ts-jest/issues/1827)) ([cc89d5b](https://github.com/kulshekhar/ts-jest/commit/cc89d5b1f912975cd29114c5b3b0bf18426816da)), closes [#1506](https://github.com/kulshekhar/ts-jest/issues/1506)
* **compiler:** use `resolveModuleNames` TypeScript API to get resolved modules for test files ([#1784](https://github.com/kulshekhar/ts-jest/issues/1784)) ([5f26054](https://github.com/kulshekhar/ts-jest/commit/5f2605457e94b548bd7b9b28fc968554f7eefa91)), closes [#1747](https://github.com/kulshekhar/ts-jest/issues/1747)
* **config:** invalidate cache when other options in `tsconfig` change ([#1788](https://github.com/kulshekhar/ts-jest/issues/1788)) ([6948855](https://github.com/kulshekhar/ts-jest/commit/69488552eca2846f3fc6ba86ab49d7893caaf521))
### Performance Improvements
* **compiler:** cache module resolution for `isolatedModules: false` ([#1786](https://github.com/kulshekhar/ts-jest/issues/1786)) ([7f731ed](https://github.com/kulshekhar/ts-jest/commit/7f731ed8a02755aeb41ecb27df4eaf16db2ddd95))
* **compiler:** use `globsToMatcher` from `jest-util` ([#1754](https://github.com/kulshekhar/ts-jest/issues/1754)) ([44f3913](https://github.com/kulshekhar/ts-jest/commit/44f3913c2a017734ed87346b1c5fbec639d02062))
* **compiler:** generate source map correctly when tsconfig `mapRoot` is set ([#1741](https://github.com/kulshekhar/ts-jest/issues/1741)) ([01ac417](https://github.com/kulshekhar/ts-jest/commit/01ac417)), closes [#1718](https://github.com/kulshekhar/ts-jest/issues/1718)
* **config:** show version warning when using ts-jest without babel ([#1729](https://github.com/kulshekhar/ts-jest/issues/1729)) ([e512bc0](https://github.com/kulshekhar/ts-jest/commit/e512bc0)), fixes [#1678-issuecomment-641930332](https://github.com//github.com/kulshekhar/ts-jest/pull/1678/issues/issuecomment-641930332), [#1678-issuecomment-639528993](https://github.com//github.com/kulshekhar/ts-jest/pull/1678/issues/issuecomment-639528993)
* **typing:** don't mark `BabelConfig` as internal type ([#1667](https://github.com/kulshekhar/ts-jest/issues/1667)) ([558c307](https://github.com/kulshekhar/ts-jest/commit/558c307)), closes [#1666](https://github.com/kulshekhar/ts-jest/issues/1666)
### Features
* **config:** show a warning message when TypeScript `target` version doesn't match with recommended NodeJs version ([#1678](https://github.com/kulshekhar/ts-jest/issues/1678)) ([085bdf5](https://github.com/kulshekhar/ts-jest/commit/085bdf5))
* **config:** support multiple paths for `pathsToModuleNameMapper` ([#1690](https://github.com/kulshekhar/ts-jest/issues/1690)) ([a727bd5](https://github.com/kulshekhar/ts-jest/commit/a727bd5))
* support TypeScript 3.9 ([#1653](https://github.com/kulshekhar/ts-jest/issues/1653)) ([fc3d5ad](https://github.com/kulshekhar/ts-jest/commit/fc3d5ad))
* **compiler:** return `undefined` for `getScriptVersion` when a file doesn't exist in memory cache ([#1641](https://github.com/kulshekhar/ts-jest/issues/1641)) ([6851b8e](https://github.com/kulshekhar/ts-jest/commit/6851b8e))
### Features
* support Jest v26 ([#1602](https://github.com/kulshekhar/ts-jest/issues/1602)) ([23b7741](https://github.com/kulshekhar/ts-jest/commit/23b7741))
* **compiler:** don't resolve files from build folder for `projectReferences` ([#1614](https://github.com/kulshekhar/ts-jest/issues/1614)) ([74b92d3](https://github.com/kulshekhar/ts-jest/commit/74b92d3))
* **config:** don't set `include` value of `tsconfig` to empty array ([#1606](https://github.com/kulshekhar/ts-jest/issues/1606)) ([8a29aaa](https://github.com/kulshekhar/ts-jest/commit/8a29aaa))
* **compiler:** make `projectReferences` work with `isolatedModules: false` ([#1541](https://github.com/kulshekhar/ts-jest/issues/1541)) ([3e8efbe](https://github.com/kulshekhar/ts-jest/commit/3e8efbe))
* **compiler:** allow using `files` provided by `tsconfig` ([#1562](https://github.com/kulshekhar/ts-jest/issues/1562)) ([a9f02bd](https://github.com/kulshekhar/ts-jest/commit/a9f02bd))
* **config:** verify `testMatchPatterns` contain RegExp instance or string type values ([#1569](https://github.com/kulshekhar/ts-jest/issues/1569)) ([7f85bab](https://github.com/kulshekhar/ts-jest/commit/7f85bab))
### Features
* **config:** add `tsconfig` alias to `tsConfig` option ([#1565](https://github.com/kulshekhar/ts-jest/issues/1565)) ([c10eb6d](https://github.com/kulshekhar/ts-jest/commit/c10eb6d))
* **config:** define 'ts-jest' on `ConfigGlobals` interface of `@jest/types` ([#1592](https://github.com/kulshekhar/ts-jest/issues/1592)) ([4526392](https://github.com/kulshekhar/ts-jest/commit/4526392))
### Performance Improvements
* **compiler:** don’t write compile output to file system but rely on jest cache ([#1561](https://github.com/kulshekhar/ts-jest/issues/1561)) ([d11a4ea](https://github.com/kulshekhar/ts-jest/commit/d11a4ea))
* **compiler:** improve performance for `isolatedModules: false` ([#1558](https://github.com/kulshekhar/ts-jest/issues/1558)) ([85c09e3](https://github.com/kulshekhar/ts-jest/commit/85c09e3))
### BREAKING CHANGES
* Any custom typing files or files which are needed to be compiled and intended to use with `jest` need to be defined in `files` option of `tsconfig`.
For example:
```
// tsconfig.json
{
// ...other configs
"files": [
"my-custom-typings.d.ts",
"my-global-module.ts"
]
}
```
* **compiler:** `incremental` and `compilerHost` options are no longer available. Please remove it from your `ts-jest` config.
* **compiler:** allow using `files` provided by `tsconfig` ([#1562](https://github.com/kulshekhar/ts-jest/issues/1562)) ([907a280](https://github.com/kulshekhar/ts-jest/commit/907a280))
* **config:** verify `testMatchPatterns` contain `RegExp` instance or `string` type values ([#1569](https://github.com/kulshekhar/ts-jest/issues/1569)) ([7f85bab](https://github.com/kulshekhar/ts-jest/commit/7f85bab))
### Features
* **config:** add `tsconfig` alias to `tsConfig` option ([#1565](https://github.com/kulshekhar/ts-jest/issues/1565)) ([c10eb6d](https://github.com/kulshekhar/ts-jest/commit/c10eb6d))
### Performance Improvements
* **compiler:** don’t write compile output to file system but rely on `jest` cache ([#1561](https://github.com/kulshekhar/ts-jest/issues/1561)) ([07b5f62](https://github.com/kulshekhar/ts-jest/commit/07b5f62))
### BREAKING CHANGES
* Any custom typing files or files which are needed to be compiled and intended to use with `jest` need to be defined in `files` option of `tsconfig`.
* **compiler:** make `projectReferences` work with `isolatedModules: false` ([#1541](https://github.com/kulshekhar/ts-jest/issues/1541)) ([3e8efbe](https://github.com/kulshekhar/ts-jest/commit/3e8efbe))
### Performance
* **compiler:** improve performance for `isolatedModules: false` ([#1558](https://github.com/kulshekhar/ts-jest/issues/1558)) ([85c09e3](https://github.com/kulshekhar/ts-jest/commit/85c09e3))
### BREAKING CHANGES
* **config:** `compilerHost` and `incremental` options are no longer available
* **compiler:** make `projectReferences` work with `isolatedModules: true` ([#1527](https://github.com/kulshekhar/ts-jest/issues/1527)) ([aa6b74c](https://github.com/kulshekhar/ts-jest/commit/aa6b74c))
* **compiler:** make sure `LanguageService` updated with test file information before getting diagnostics for test file ([#1507](https://github.com/kulshekhar/ts-jest/issues/1507)) ([311eaeb](https://github.com/kulshekhar/ts-jest/commit/311eaeb))
* **config:** set default `outDir` when `allowJs` is true and no `outDir` in `tsconfig` ([#1502](https://github.com/kulshekhar/ts-jest/issues/1502)) ([1a287ad](https://github.com/kulshekhar/ts-jest/commit/1a287ad))
* **config:** use original jest config object instead of stringified config ([#1511](https://github.com/kulshekhar/ts-jest/issues/1511)) ([4f0bb33](https://github.com/kulshekhar/ts-jest/commit/4f0bb33))
* only do type checking while compiling file ([#1483](https://github.com/kulshekhar/ts-jest/issues/1483)) ([dbc0a08](https://github.com/kulshekhar/ts-jest/commit/dbc0a08))
* **config:** set default outDir for enabled allowJs without outDir ([#1472](https://github.com/kulshekhar/ts-jest/issues/1472)) ([57c7af0](https://github.com/kulshekhar/ts-jest/commit/57c7af0))
* add `jest-config` to dependencies list ([6d9e0d8](https://github.com/kulshekhar/ts-jest/commit/6d9e0d8))
* always do type check for all files provided to ts-jest transformer for non-watch mode ([#1450](https://github.com/kulshekhar/ts-jest/issues/1450)) ([107e062](https://github.com/kulshekhar/ts-jest/commit/107e062))
* **config:** improve diagnostics message ([#1444](https://github.com/kulshekhar/ts-jest/issues/1444)) ([96cd9b3](https://github.com/kulshekhar/ts-jest/commit/96cd9b3)). This will affect to any snapshots or assertion against diagnostics messages
* **compiler:** allow transformation of typescript files in node_modules ([#1385](https://github.com/kulshekhar/ts-jest/issues/1385)) ([814405e](https://github.com/kulshekhar/ts-jest/commit/814405e))
* **docs:** fixing slack link and some minor typos in documenation ([#1404](https://github.com/kulshekhar/ts-jest/issues/1404)) ([3e2e008](https://github.com/kulshekhar/ts-jest/commit/3e2e008))
* **transformer:** add deepUnmock to hoist method list ([#1372](https://github.com/kulshekhar/ts-jest/issues/1372)) ([0fbbc00](https://github.com/kulshekhar/ts-jest/commit/0fbbc00))
* **util:** use resolve package typescript package in yarn workspaces ([#1377](https://github.com/kulshekhar/ts-jest/issues/1377)) ([a63808c](https://github.com/kulshekhar/ts-jest/commit/a63808c))
* jest 25 type definitions ([#1363](https://github.com/kulshekhar/ts-jest/issues/1363)) ([ba82a9e](https://github.com/kulshekhar/ts-jest/commit/ba82a9e))
* **compiler:** do not force module kind if piping babel ([acebc8c](https://github.com/kulshekhar/ts-jest/commit/acebc8c)), closes [#767](https://github.com/kulshekhar/ts-jest/issues/767)
### Features
* **helpers:** adds a mocked test helper for mock typings ([f976135](https://github.com/kulshekhar/ts-jest/commit/f976135)), closes [#576](https://github.com/kulshekhar/ts-jest/issues/576)
* **cli:** resets testMatch if using testRegex option ([31ad0aa](https://github.com/kulshekhar/ts-jest/commit/31ad0aa)), closes [#756](https://github.com/kulshekhar/ts-jest/issues/756)
* **diagnostics:** throws only for category warning and error ([bb28849](https://github.com/kulshekhar/ts-jest/commit/bb28849)), closes [#748](https://github.com/kulshekhar/ts-jest/issues/748)
* **import:** wrong error message when a module exists but fails ([e0d6c57](https://github.com/kulshekhar/ts-jest/commit/e0d6c57))
* **preset:** createJestPreset fails with base and no array ([3c325e8](https://github.com/kulshekhar/ts-jest/commit/3c325e8))
### Features
* **cli:** CLI 'config:migrate' now detects best preset ([febd8d3](https://github.com/kulshekhar/ts-jest/commit/febd8d3))
* **preset:** adds 2 presets along the default one ([9f3d759](https://github.com/kulshekhar/ts-jest/commit/9f3d759))
* **preset:** adds presets typings and export all presets ([f55d895](https://github.com/kulshekhar/ts-jest/commit/f55d895))
* **babel:** instrumentation was done twice when using babel ([659a7fb](https://github.com/kulshekhar/ts-jest/commit/659a7fb)), closes [#713](https://github.com/kulshekhar/ts-jest/issues/713)
* **cache:** includes all parameters in cache key computing ([70e1867](https://github.com/kulshekhar/ts-jest/commit/70e1867))
* **e2e:** fixes the eval tool (not used yet) ([939d13a](https://github.com/kulshekhar/ts-jest/commit/939d13a))
* we are not writing files, use normalized EOL ([47fff43](https://github.com/kulshekhar/ts-jest/commit/47fff43))
* **tests:** CI fixes ([34a41ea](https://github.com/kulshekhar/ts-jest/commit/34a41ea))
* **tests:** detect npm version to use or not ci ([683a1e5](https://github.com/kulshekhar/ts-jest/commit/683a1e5))
* **tests:** do not use babel in our tests + new API for simple ([3e4de3e](https://github.com/kulshekhar/ts-jest/commit/3e4de3e))
* **tests:** more sanitizing for windows compat ([faae274](https://github.com/kulshekhar/ts-jest/commit/faae274))
### Features
* **config:** adds a helper to build moduleNameMapper from paths ([7b8598e](https://github.com/kulshekhar/ts-jest/commit/7b8598e)), closes [#364](https://github.com/kulshekhar/ts-jest/issues/364)
* **package:** update source-map-support to version 0.5.0 ([f0aab12](https://github.com/kulshekhar/ts-jest/commit/f0aab12))
* **package:** update yargs to version 10.0.3 ([5cdf969](https://github.com/kulshekhar/ts-jest/commit/5cdf969))
* **package:** update yargs to version 11.0.0 ([7e9ce40](https://github.com/kulshekhar/ts-jest/commit/7e9ce40))
* add startDir to if-clause ([eed5311](https://github.com/kulshekhar/ts-jest/commit/eed5311))
* **package:** update yargs to version 9.0.1 ([#326](https://github.com/kulshekhar/ts-jest/issues/326)) ([8bf9924](https://github.com/kulshekhar/ts-jest/commit/8bf9924))
### Features
* add option to run TypeScript diagnostics ([13b77d9](https://github.com/kulshekhar/ts-jest/commit/13b77d9))
