Tips on javascript / typescript development
Spread
Update object with spread operator
In React and React Native, the common patter is to map an object to form inputs and update the values of the properties. Spread operator, ...
, comes really handy for the purpose.
<FloatingLabelInput
isRequired
label="Customer Address (line1)"
defaultValue={job.customer.address.line1}
errorMessage={validation.customerAddress1}
onChangeText={(customerAddress1: string) => {
setJob({
...job,
customer: {
...job.customer,
address: {
...job.customer.address,
line1: customerAddress1.trim()
}
}
})
setValidation({...validation, customerAddress1: ''})
}}
autoCapitalize="none"
/>
Kill all node processes
Your old server processor is still running and when you do yarn stardt
it asks if you want the new server run with a new port number, annoyingly. Kill all the existing node processes.
ps aux | grep node
killall -9 node
Promise
Create a promise from a non-async function
Sometimes, I have to do this to match the expected signature.
export const handler = startServerAndCreateLambdaHandler(
server,
handlers.createAPIGatewayProxyEventRequestHandler(),
{
middleware: [
async event => {
return new Promise(result => {
console.log('event', event, result)
result()
})
},
],
}
)
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