Accessing data from a file using a Firebase function

Question

Accessing data from a file using a Firebase function

I have a Firebase Function and I need to retrieve an html file from a subfolder.

── functions
    ├── src
    |   ├── index.ts // The function is located here
    |   ├── html
    |   |   ├── template.html // This is the file I want to access

I attempted to read the file using

const html = fs.readFileSync('./html/template.html');

but I keep getting the following error message

Error: ENOENT: no such file or directory, open './html/template.html' at Object.openSync

I have tried numerous solutions on stackoverflow without success. I even attempted moving the file into the same folder as the function, but encountered the same error.

Do I need to install a specific package or import the file in a different way to be able to access it?

typescript firebase file google-cloud-platform google-cloud-functions

Answer 1

Answer №1

If you're finding your way to this post through a search...

The key here is not to rely on path.resolve.

The issue lies in the fact that fs.readFileSync resolves paths based on process.cwd() (the directory where Node was run from). For firebase functions, this will typically be the directory specified for source in firebase.json (usually the functions directory).
You can find more about this behavior documented here:
https://nodejs.org/api/path.html#path_path_resolve_paths

If an absolute path isn't obtained after processing all segments, the current working directory is used.

path.resolve follows a similar principle, always returning an absolute path. If the provided path isn't absolute, it will prepend process.cwd().
Although this detail may not be explicitly stated in the Node documentation, you can verify it yourself at: https://github.com/nodejs/node/blob/029d1fd797975ef89b867f9d606257f0f070a462/lib/path.js#L1017

To address this issue, consider two solutions:

Use a path relative to your functions' root directory (src/html/template.html in this scenario)

Utilize __dirname (

path.resolve(__dirname, './html/template.html')

)

__dirname always provides the absolute path to the directory of the currently executing file.

Answer 2

If you're finding your way to this post through a search...

The key here is not to rely on path.resolve.

The issue lies in the fact that fs.readFileSync resolves paths based on process.cwd() (the directory where Node was run from). For firebase functions, this will typically be the directory specified for source in firebase.json (usually the functions directory).
You can find more about this behavior documented here:
https://nodejs.org/api/path.html#path_path_resolve_paths

If an absolute path isn't obtained after processing all segments, the current working directory is used.

path.resolve follows a similar principle, always returning an absolute path. If the provided path isn't absolute, it will prepend process.cwd().
Although this detail may not be explicitly stated in the Node documentation, you can verify it yourself at: https://github.com/nodejs/node/blob/029d1fd797975ef89b867f9d606257f0f070a462/lib/path.js#L1017

To address this issue, consider two solutions:

Use a path relative to your functions' root directory (src/html/template.html in this scenario)

Utilize __dirname (

path.resolve(__dirname, './html/template.html')

)

__dirname always provides the absolute path to the directory of the currently executing file.

Answer 3

Answer №2

One way to ensure that your path is resolved into an absolute path before using it with the fs.readdirSync() method is by utilizing the path.resolve() method in Node.js. Here's how you can implement this:

    const path = require('path');

    // ...

    let content = fs.readFileSync(
        path.resolve('./public/index.html')
    );

Answer 4

One way to ensure that your path is resolved into an absolute path before using it with the fs.readdirSync() method is by utilizing the path.resolve() method in Node.js. Here's how you can implement this:

    const path = require('path');

    // ...

    let content = fs.readFileSync(
        path.resolve('./public/index.html')
    );

Accessing data from a file using a Firebase function

Answer №1

Answer №2

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