feat: remove TypeScript < 3.6 support

package.json

@@ -75,7 +75,8 @@
     "tapable": "^2.0.0"
   },
   "peerDependencies": {
-    "webpack": "^5.11.0"
+    "webpack": "^5.11.0",
+    "typescript": ">3.6.0"
   },
   "devDependencies": {
     "@commitlint/config-conventional": "^11.0.0",

src/typescript-reporter/TypeScriptSupport.ts

@@ -17,21 +17,11 @@ function assertTypeScriptSupport(configuration: TypeScriptReporterConfiguration)
     );
   }
 
-  if (semver.lt(typescriptVersion, '2.7.0')) {
+  if (semver.lt(typescriptVersion, '3.6.0')) {
     throw new Error(
       [
         `ForkTsCheckerWebpackPlugin cannot use the current typescript version of ${typescriptVersion}.`,
-        'The minimum required version is 2.7.0.',
-      ].join(os.EOL)
-    );
-  }
-
-  if (configuration.build && semver.lt(typescriptVersion, '3.6.0')) {
-    throw new Error(
-      [
-        `ForkTsCheckerWebpackPlugin cannot use the current typescript version of ${typescriptVersion} because of the "build" option enabled.`,
-        'The minimum version that supports "build" option is 3.6.0.',
-        'Consider upgrading `typescript` or disabling "build" option.',
+        'The minimum required version is 3.6.0.',
       ].join(os.EOL)
     );
   }

src/typescript-reporter/reporter/TypeScriptConfigurationParser.ts

@@ -2,6 +2,7 @@ import * as ts from 'typescript';
 import { normalize, dirname, basename, resolve, relative } from 'path';
 import { TypeScriptConfigurationOverwrite } from '../TypeScriptConfigurationOverwrite';
 import { FilesMatch } from '../../reporter';
+import forwardSlash from '../../utils/path/forwardSlash';
 
 function parseTypeScriptConfiguration(
   typescript: typeof ts,
@@ -10,8 +11,9 @@ function parseTypeScriptConfiguration(
   configOverwriteJSON: TypeScriptConfigurationOverwrite,
   parseConfigFileHost: ts.ParseConfigFileHost
 ): ts.ParsedCommandLine {
+  const configFilePath = forwardSlash(configFileName);
   const parsedConfigFileJSON = typescript.readConfigFile(
-    configFileName,
+    configFilePath,
     parseConfigFileHost.readFile
   );
 
@@ -34,7 +36,7 @@ function parseTypeScriptConfiguration(
     ...parsedConfigFile,
     options: {
       ...parsedConfigFile.options,
-      configFilePath: configFileName,
+      configFilePath: configFilePath,
     },
     errors: parsedConfigFileJSON.error ? [parsedConfigFileJSON.error] : parsedConfigFile.errors,
   };

test/e2e/TypeScriptConfiguration.spec.ts

@@ -6,10 +6,10 @@ import {
 
 describe('TypeScript Configuration', () => {
   it.each([
-    { async: true, typescript: '2.7.1', 'ts-loader': '^5.0.0' },
-    { async: false, typescript: '~3.0.0', 'ts-loader': '^6.0.0' },
-    { async: true, typescript: '~3.7.0', 'ts-loader': '^7.0.0' },
-    { async: false, typescript: '~3.8.0', 'ts-loader': '^6.0.0' },
+    { async: true, typescript: '~3.6.0', 'ts-loader': '^7.0.0' },
+    { async: false, typescript: '~3.8.0', 'ts-loader': '^8.0.0' },
+    { async: true, typescript: '~4.0.0', 'ts-loader': '^8.0.0' },
+    { async: false, typescript: '~4.3.0', 'ts-loader': '^8.0.0' },
   ])(
     'change in the tsconfig.json affects compilation for %p',
     async ({ async, ...dependencies }) => {
@@ -39,10 +39,10 @@ describe('TypeScript Configuration', () => {
   );
 
   it.each([
-    { typescript: '2.7.1' },
-    { typescript: '~3.0.0' },
     { typescript: '~3.6.0' },
     { typescript: '^3.8.0' },
+    { typescript: '^4.0.0' },
+    { typescript: '^4.3.0' },
   ])('reports errors because of the misconfiguration', async (dependencies) => {
     await sandbox.load(path.join(__dirname, 'fixtures/typescript-basic'));
     await sandbox.install('yarn', { ...dependencies });

test/e2e/TypeScriptContextOption.spec.ts

@@ -4,10 +4,10 @@ import { createWebpackDevServerDriver } from './driver/WebpackDevServerDriver';
 
 describe('TypeScript Context Option', () => {
   it.each([
-    { async: true, typescript: '2.7.1' },
-    { async: false, typescript: '~3.0.0' },
     { async: true, typescript: '~3.6.0' },
     { async: false, typescript: '~3.8.0' },
+    { async: true, typescript: '~4.0.0' },
+    { async: false, typescript: '~4.3.0' },
   ])('uses context and cwd to resolve project files for %p', async ({ async, typescript }) => {
     await sandbox.load(path.join(__dirname, 'fixtures/typescript-basic'));
     await sandbox.install('yarn', { typescript });

test/e2e/TypeScriptFormatterOption.spec.ts

@@ -4,7 +4,7 @@ import { createWebpackDevServerDriver } from './driver/WebpackDevServerDriver';
 describe('TypeScript Formatter Option', () => {
   it.each([
     { async: true, typescript: '~3.6.0' },
-    { async: false, typescript: '~3.8.0' },
+    { async: false, typescript: '~4.3.0' },
   ])(
     'uses the custom formatter to format the error message for %p',
     async ({ async, typescript }) => {

test/e2e/TypeScriptPnpSupport.spec.ts

@@ -1,11 +1,12 @@
 import path from 'path';
 import { createWebpackDevServerDriver } from './driver/WebpackDevServerDriver';
+import semver from 'semver';
 
 describe('TypeScript PnP Support', () => {
   it.each([
-    { async: true, typescript: '2.7.1', 'ts-loader': '^5.0.0' },
-    { async: false, typescript: '~3.0.0', 'ts-loader': '^6.0.0' },
-    { async: true, typescript: '~3.8.0', 'ts-loader': '^7.0.0' },
+    { async: true, typescript: '~3.6.0', 'ts-loader': '^7.0.0' },
+    { async: false, typescript: '~4.0.0', 'ts-loader': '^8.0.0' },
+    { async: true, typescript: '~4.3.0', 'ts-loader': '^8.0.0' },
   ])('reports semantic error for %p', async ({ async, ...dependencies }) => {
     await sandbox.load(path.join(__dirname, 'fixtures/typescript-pnp'));
     await sandbox.install('yarn', { ...dependencies });
@@ -70,7 +71,9 @@ describe('TypeScript PnP Support', () => {
     expect(errors).toContain(
       [
         'ERROR in ./src/index.ts 1:23-39',
-        "TS2307: Cannot find module './authenticate'.",
+        semver.satisfies(semver.minVersion(dependencies.typescript), '>=4.0.0')
+          ? "TS2307: Cannot find module './authenticate' or its corresponding type declarations."
+          : "TS2307: Cannot find module './authenticate'.",
         "  > 1 | import { login } from './authenticate';",
         '      |                       ^^^^^^^^^^^^^^^^',
         "    2 | import { getUserName } from './model/User';",

test/e2e/TypeScriptSolutionBuilderApi.spec.ts

@@ -1,11 +1,13 @@
 import path from 'path';
 import { createWebpackDevServerDriver } from './driver/WebpackDevServerDriver';
+import semver from 'semver';
 
 describe('TypeScript SolutionBuilder API', () => {
   it.each([
     { async: false, typescript: '~3.6.0', mode: 'readonly' },
     { async: true, typescript: '~3.8.0', mode: 'write-tsbuildinfo' },
-    { async: false, typescript: '~3.8.0', mode: 'write-references' },
+    { async: false, typescript: '~4.0.0', mode: 'write-references' },
+    { async: true, typescript: '~4.3.0', mode: 'readonly' },
   ])('reports semantic error for %p', async ({ async, typescript, mode }) => {
     await sandbox.load(path.join(__dirname, 'fixtures/typescript-monorepo'));
     await sandbox.install('yarn', { typescript });
@@ -53,7 +55,7 @@ describe('TypeScript SolutionBuilder API', () => {
       [
         'ERROR in ./packages/client/src/index.ts 4:42-48',
         "TS2345: Argument of type 'T[]' is not assignable to parameter of type 'T'.",
-        typescript === '~4.0.0'
+        semver.satisfies(semver.minVersion(typescript), '>=4.0.0')
           ? "  'T' could be instantiated with an arbitrary type which could be unrelated to 'T[]'."
           : "  'T[]' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint '{}'.",
         '    2 |',

test/e2e/TypeScriptWatchApi.spec.ts

@@ -1,5 +1,6 @@
 import path from 'path';
 import { createWebpackDevServerDriver } from './driver/WebpackDevServerDriver';
+import semver from 'semver';
 
 describe('TypeScript Watch API', () => {
   it.each([{ async: false }, { async: true }])(
@@ -209,10 +210,10 @@ describe('TypeScript Watch API', () => {
   );
 
   it.each([
-    { async: true, typescript: '2.7.1', 'ts-loader': '^5.0.0' },
-    { async: false, typescript: '~3.0.0', 'ts-loader': '^6.0.0' },
-    { async: true, typescript: '~3.6.0', 'ts-loader': '^7.0.0' },
-    { async: false, typescript: '~3.8.0', 'ts-loader': '^6.0.0' },
+    { async: true, typescript: '~3.6.0', 'ts-loader': '^6.0.0' },
+    { async: false, typescript: '~3.8.0', 'ts-loader': '^7.0.0' },
+    { async: true, typescript: '~4.0.0', 'ts-loader': '^8.0.0' },
+    { async: false, typescript: '~4.3.0', 'ts-loader': '^8.0.0' },
   ])('reports semantic error for %p', async ({ async, ...dependencies }) => {
     await sandbox.load(path.join(__dirname, 'fixtures/typescript-basic'));
     await sandbox.install('yarn', { ...dependencies });
@@ -277,7 +278,9 @@ describe('TypeScript Watch API', () => {
     expect(errors).toContain(
       [
         'ERROR in ./src/index.ts 1:23-39',
-        "TS2307: Cannot find module './authenticate'.",
+        semver.satisfies(semver.minVersion(dependencies.typescript), '>=4.0.0')
+          ? "TS2307: Cannot find module './authenticate' or its corresponding type declarations."
+          : "TS2307: Cannot find module './authenticate'.",
         "  > 1 | import { login } from './authenticate';",
         '      |                       ^^^^^^^^^^^^^^^^',
         "    2 | import { getUserName } from './model/User';",

test/unit/typescript-reporter/TypeScriptSupport.spec.ts

@@ -42,43 +42,20 @@ describe('typescript-reporter/TypeScriptSupport', () => {
     );
   });
 
-  it('throws error if typescript version is lower then 2.7.0', async () => {
-    jest.setMock('typescript', { version: '2.6.9' });
-
-    const { assertTypeScriptSupport } = await import('lib/typescript-reporter/TypeScriptSupport');
-
-    expect(() => assertTypeScriptSupport(configuration)).toThrowError(
-      [
-        `ForkTsCheckerWebpackPlugin cannot use the current typescript version of 2.6.9.`,
-        'The minimum required version is 2.7.0.',
-      ].join(os.EOL)
-    );
-  });
-
-  it("doesn't throw error if typescript version is greater or equal 2.7.0", async () => {
-    jest.setMock('typescript', { version: '2.7.0' });
-    jest.setMock('fs-extra', { existsSync: () => true });
-
-    const { assertTypeScriptSupport } = await import('lib/typescript-reporter/TypeScriptSupport');
-
-    expect(() => assertTypeScriptSupport(configuration)).not.toThrowError();
-  });
-
-  it('throws error if typescript version is lower then 3.6.0 and configuration has enabled build option', async () => {
+  it('throws error if typescript version is lower then 3.6.0', async () => {
     jest.setMock('typescript', { version: '3.5.9' });
 
     const { assertTypeScriptSupport } = await import('lib/typescript-reporter/TypeScriptSupport');
 
-    expect(() => assertTypeScriptSupport({ ...configuration, build: true })).toThrowError(
+    expect(() => assertTypeScriptSupport(configuration)).toThrowError(
       [
-        `ForkTsCheckerWebpackPlugin cannot use the current typescript version of 3.5.9 because of the "build" option enabled.`,
-        'The minimum version that supports "build" option is 3.6.0.',
-        'Consider upgrading `typescript` or disabling "build" option.',
+        `ForkTsCheckerWebpackPlugin cannot use the current typescript version of 3.5.9.`,
+        'The minimum required version is 3.6.0.',
       ].join(os.EOL)
     );
   });
 
-  it("doesn't throw error if typescript version is greater or equal 3.6.0 and configuration has enabled build option", async () => {
+  it("doesn't throw error if typescript version is greater or equal 3.6.0", async () => {
     jest.setMock('typescript', { version: '3.6.0' });
     jest.setMock('fs-extra', { existsSync: () => true });