[英]Node.js fs.access returns undefined no matter what
这是代码:
import * as path from 'path';
import * as fs from 'fs';
const doesPathExist = async (path: string) => {
return await fs.access(path, fs.constants.R_OK, (err) => {
return err ? false : true;
});
};
const someFunc = async (documentName: string) => {
const documentPath = path.join(__dirname, documentName);
const pathExists = doesPathExist(documentName);
};
function doesPathExist
似乎返回Promise<void>
,无论结果如何,都使pathExists
变量undefined
。 在运行fs.access
并在回调中更改其值之前,我尝试在 function 顶部初始化一个临时变量,但仍然没有运气。
问题在于fs.access
,这个 function 不返回 Promise 或其他任何东西。
有几个选项可以解决它。
fs.accessSync()
const doesPathExist = async (path: string) => {
try {
fs.accessSync(path, fs.constants.R_OK)
return true
} catch (e) {
return false
}
};
fs.promises
const fsPromises = fs.promises;
const doesPathExistB = async (path: string) => {
try {
await fsPromises.access(path, fs.constants.R_OK)
return true
} catch (e) {
return false
}
};
// OR
const doesPathExistA = async (path: string) => {
return new Promise(async (resolve) => {
await fsPromises.access(path, fs.constants.R_OK)
.then(() => resolve(true))
.catch(() => resolve(false))
})
};
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