File1.ts: I am calling the below method of file2 service and expecting the response.
const output = await this.file2Service.getMainData();
File2.ts: I am expecting the return value(dataSource) from the below method. But what's happening here is "The below function is returning the dataSource even before the code in .then() block gets executed."
So I am getting undefined every time. What needs to be done in order to get the actual dataSource value.
public async getMainData(): Promise<any> {
const data = await this.getSubData();
data.forEach((result) => {
result.then((finalResult) => {
if (finalResult === 'success') {
const dataSource = await this.callDataSource();
}
});
});
return dataSource;
}
Please ignore the syntax errors in above snippet, Its just an example not the actual code.
You don't need to invoke .then if you're awaiting a method already.
public async getMainData(): Promise<any> {
const data = await this.getSubData();
for (const result of data) {
// from your code sample it's unclear
// whether getSubData returns a collection of
// values or a collection of promises-of-values,
// remove the await if you're simply returning values
const finalResult = await result;
if (finalResult === 'success') {
return await this.callDataSource();
}
}
throw new Error('could not find a successful result.');
}