perf(jest): readDefaultTsConfig should just execute once

Author: Brooooooklyn

packages/integrate/tsconfig.json

@@ -4,7 +4,8 @@
     "composite": true,
     "rootDir": ".",
     "outDir": "./lib",
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "types": ["node", "jest"]
   },
   "include": ["."],
   "files": ["./package.json"],

packages/jest/index.ts

@@ -25,11 +25,13 @@ function getJestTransformConfig(jestConfig: JestConfig26 | JestConfig27): Option
   return {}
 }
 
+const defaultTsConfig = readDefaultTsConfig()
+
 export = {
   process(src: string, path: string, jestConfig: JestConfig26 | JestConfig27): Output | string {
     if (/\.(tsx?|jsx?|mjs)$/.test(path)) {
       return transformJest(src, path, {
-        ...tsCompilerOptionsToSwcConfig(readDefaultTsConfig(), path),
+        ...tsCompilerOptionsToSwcConfig(defaultTsConfig, path),
         ...getJestTransformConfig(jestConfig),
       })
     }