whole_func_string: function readPackageJson(dir) {
      const filePath = path.join(dir, "package.json")
      try {
          const text = fs.readFileSync(filePath, "utf8")
          const data = JSON.parse(text)
  
          if (typeof data === "object" && data !== null) {
              data.filePath = filePath
              return data
          }
      } catch (_err) {
          // do nothing.
      }
  
      return null
  }
func_code_string: function readPackageJson(dir) {
      const filePath = path.join(dir, "package.json")
      try {
          const text = fs.readFileSync(filePath, "utf8")
          const data = JSON.parse(text)
  
          if (typeof data === "object" && data !== null) {
              data.filePath = filePath
              return data
          }
      } catch (_err) {
          // do nothing.
      }
  
      return null
  }
func_documentation_string: Reads the `package.json` data in a given path.
  
  Don't cache the data.
  
  @param {string} dir - The path to a directory to read.
  @returns {object|null} The read `package.json` data, or null.