perf: do not type check if fileName doesn't match

Author: huafu

src/compiler.ts

@@ -101,7 +101,9 @@ export function createCompiler(configs: ConfigSet): TsCompiler {
       ? configs.filterDiagnostics(result.diagnostics)
       : []
 
-    if (diagnosticList.length) throw configs.createTsError(diagnosticList)
+    if (diagnosticList.length) {
+      throw configs.createTsError(diagnosticList)
+    }
 
     return [result.outputText, result.sourceMapText as string]
   }
@@ -174,16 +176,18 @@ export function createCompiler(configs: ConfigSet): TsCompiler {
 
       const output = service.getEmitOutput(fileName)
 
-      // Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.
-      const diagnostics = service
-        .getCompilerOptionsDiagnostics()
-        .concat(service.getSyntacticDiagnostics(fileName))
-        .concat(service.getSemanticDiagnostics(fileName))
+      if (configs.shouldReportDiagnostic(fileName)) {
+        // Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.
+        const diagnostics = service
+          .getCompilerOptionsDiagnostics()
+          .concat(service.getSyntacticDiagnostics(fileName))
+          .concat(service.getSemanticDiagnostics(fileName))
 
-      const diagnosticList = configs.filterDiagnostics(diagnostics)
+        const diagnosticList = configs.filterDiagnostics(diagnostics)
 
-      if (diagnosticList.length) {
-        throw configs.createTsError(diagnosticList)
+        if (diagnosticList.length) {
+          throw configs.createTsError(diagnosticList)
+        }
       }
 
       if (output.emitSkipped) {

src/ts-jest-transformer.ts

@@ -89,9 +89,6 @@ export class TsJestTransformer implements jest.Transformer {
     const stringify = configs.shouldStringifyContent(filePath)
     const babelJest = stringify ? undefined : configs.babelJestTransformer
 
-    // get the compiler instance
-    const compiler = configs.tsCompiler
-
     // handles here what we should simply stringify
     if (stringify) {
       source = `module.exports=${JSON.stringify(source)}`
@@ -100,7 +97,7 @@ export class TsJestTransformer implements jest.Transformer {
     // transpile TS code (source maps are included)
     result = filePath.endsWith('.d.ts')
       ? '' // do not try to compile declaration files
-      : compiler.compile(source, filePath)
+      : configs.tsCompiler.compile(source, filePath)
 
     // calling babel-jest transformer
     if (babelJest) {