feat: support skipLibCheck, fixes #324

Author: s-panferov

src/__test__/skipLibCheck.ts

@@ -0,0 +1,38 @@
+import {
+    src, webpackConfig, tsconfig,
+    compile, expectErrors, spec
+} from './utils';
+
+spec(__filename, async function() {
+    src('index.ts', `
+        /// <reference path="./index.d.ts" />
+        function sum(a: number, b: number) {
+            return a + b;
+        }
+
+        sum(1, 1);
+    `);
+
+    src('index.d.ts', `
+        function sum(a: number, b: number): number;
+    `);
+
+    tsconfig({
+        skipLibCheck: true
+    });
+
+    let stats = await compile(webpackConfig());
+
+    expectErrors(stats, 0);
+
+    tsconfig({
+        skipLibCheck: false
+    });
+
+    stats = await compile(webpackConfig());
+
+    expectErrors(stats, 2, [
+        `A 'declare' modifier is required for a top level declaration in a .d.ts file`,
+        'Overload signatures must all be exported or non-exported'
+    ]);
+});

src/checker/runtime.ts

@@ -362,11 +362,24 @@ function createChecker(receive: (cb: (msg: Req) => void) => void, send: (msg: Re
             console.log(colors.cyan(`\n[${ instanceName }] Checking started in a separate process...`));
         }
 
-        const allDiagnostics = service.getProgram().getOptionsDiagnostics().concat(
-            service.getProgram().getGlobalDiagnostics(),
-            service.getProgram().getSyntacticDiagnostics(),
-            service.getProgram().getSemanticDiagnostics(),
-        );
+        const program = service.getProgram();
+
+        const allDiagnostics = program
+            .getOptionsDiagnostics().concat(
+                service.getProgram().getGlobalDiagnostics()
+            );
+
+        const nativeGetter = program.getSourceFiles;
+        if (compilerConfig.options.skipLibCheck) {
+            program.getSourceFiles = () => nativeGetter().filter(file => {
+                return !file.isDeclarationFile;
+            });
+        }
+
+        allDiagnostics.push(...service.getProgram().getSyntacticDiagnostics());
+        allDiagnostics.push(...service.getProgram().getSemanticDiagnostics());
+
+        program.getSourceFiles = nativeGetter;
 
         if (allDiagnostics.length) {
             console.error(colors.red(`\n[${ instanceName }] Checking finished with ${ allDiagnostics.length } errors`));