将 Firebase Cloud Function TypeScript 语法转换为 JavaScript

Question

@DougStevenson published a nice cloud functions tutorial here , but his cloud function code snippet uses TypeScript rather than JavaScript.

How would one convert the following code to vanilla JavaScript?

interface ClaimsDocumentData extends admin.firestore.DocumentData {
    _lastCommitted?: admin.firestore.Timestamp
}
export const mirrorCustomClaims =
functions.firestore.document('user-claims/{uid}')
.onWrite(async (change, context) => {
    const beforeData: ClaimsDocumentData =
        change.before.data() || {}
    const afterData: ClaimsDocumentData =
        change.after.data() || {}
})

Answer 1

Just strip the type data out of it.

exports.mirrorCustomClaims =
functions.firestore.document('user-claims/{uid}')
.onWrite(async (change, context) => {
    const beforeData = change.before.data() || {}
    const afterData = change.after.data() || {}
})

You can also set up another project with TypeScript, add the code to it, compile it, and simply observe the transpiled JavaScript.

The rest of that sample is likely to give you even more problems. Strongly suggest adopting TypeScript, since all JavaScript is valid TypeScript, and you can adopt TypeScript features into your code at the rate you choose.