Function readFile

scripts/jest/typescript/preprocessor.js:76–78

(filename)

      return ts.createSourceFile(filename, source, 'ES5', '0');
    },
    readFile(filename) {
      return ts.sys.readFile(filename);
    },
    useCaseSensitiveFileNames() {
      return ts.sys.useCaseSensitiveFileNames;
    },