How to assert that all $ReadOnlyArray members are of certain type?
I have tried iterating the array using for..of and throwing an exception if the type does not match:
type FooPacketType = 'foo';
type BarPacketType = 'bar';
type PacketType =
FooPacketType |
BarPacketType;
const packets: $ReadOnlyArray<PacketType> = ;
function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
for (const packet of packets) {
if (packet !== 'foo') {
throw new Error('Unexpected state');
}
}
ingestFooPackets(packets);
This gives an error:
18: ingestFooPackets(packets);
^ Cannot call `ingestFooPackets` with `packets` bound to `fooPackets` because string literal `bar` [1] is incompatible with string literal `foo` [2] in array element.
References:
8: const packets: $ReadOnlyArray<PacketType> = ;
^ [1]
10: function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
^ [2]
https://flow.org/try/#0C4TwDgpgBAYg9nACgQwMYGsLACrmgXigHIAzBIgbgChRIoAhZAJxQy1zsKICNnKqaeKK0w4h+KlFgIR7IQB9JDZrLGRqVVHAB2AZ2BQwaUboBcUACQAlCMgAmAeW0AbEAEEmTZCAA8qjhAAfFCEANoAuhokAK7aqMAAljpQCdoA5hD68EjGWLoAFGQ5bMBmljb2Tq4eXr7Z-niBAJRQAN4AvgJkTFD5WnoGRiVQcCSGuaUtrUoJY-lDolAAhPhcRURTSlLAABZMcADuUNoQRwCinnBM+UQAqicAHpDxEHZQ+sjAEBvUUp2dVFSGSyMgmBQWeSaFCAA
I am unsure if this is a bug (I have raised an issue) or if there is another way to assert that all members of array are of certain type.
javascript flowtype
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
add a comment |
I have tried iterating the array using for..of and throwing an exception if the type does not match:
type FooPacketType = 'foo';
type BarPacketType = 'bar';
type PacketType =
FooPacketType |
BarPacketType;
const packets: $ReadOnlyArray<PacketType> = ;
function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
for (const packet of packets) {
if (packet !== 'foo') {
throw new Error('Unexpected state');
}
}
ingestFooPackets(packets);
This gives an error:
18: ingestFooPackets(packets);
^ Cannot call `ingestFooPackets` with `packets` bound to `fooPackets` because string literal `bar` [1] is incompatible with string literal `foo` [2] in array element.
References:
8: const packets: $ReadOnlyArray<PacketType> = ;
^ [1]
10: function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
^ [2]
https://flow.org/try/#0C4TwDgpgBAYg9nACgQwMYGsLACrmgXigHIAzBIgbgChRIoAhZAJxQy1zsKICNnKqaeKK0w4h+KlFgIR7IQB9JDZrLGRqVVHAB2AZ2BQwaUboBcUACQAlCMgAmAeW0AbEAEEmTZCAA8qjhAAfFCEANoAuhokAK7aqMAAljpQCdoA5hD68EjGWLoAFGQ5bMBmljb2Tq4eXr7Z-niBAJRQAN4AvgJkTFD5WnoGRiVQcCSGuaUtrUoJY-lDolAAhPhcRURTSlLAABZMcADuUNoQRwCinnBM+UQAqicAHpDxEHZQ+sjAEBvUUp2dVFSGSyMgmBQWeSaFCAA
I am unsure if this is a bug (I have raised an issue) or if there is another way to assert that all members of array are of certain type.
javascript flowtype
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
add a comment |
I have tried iterating the array using for..of and throwing an exception if the type does not match:
type FooPacketType = 'foo';
type BarPacketType = 'bar';
type PacketType =
FooPacketType |
BarPacketType;
const packets: $ReadOnlyArray<PacketType> = ;
function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
for (const packet of packets) {
if (packet !== 'foo') {
throw new Error('Unexpected state');
}
}
ingestFooPackets(packets);
This gives an error:
18: ingestFooPackets(packets);
^ Cannot call `ingestFooPackets` with `packets` bound to `fooPackets` because string literal `bar` [1] is incompatible with string literal `foo` [2] in array element.
References:
8: const packets: $ReadOnlyArray<PacketType> = ;
^ [1]
10: function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
^ [2]
https://flow.org/try/#0C4TwDgpgBAYg9nACgQwMYGsLACrmgXigHIAzBIgbgChRIoAhZAJxQy1zsKICNnKqaeKK0w4h+KlFgIR7IQB9JDZrLGRqVVHAB2AZ2BQwaUboBcUACQAlCMgAmAeW0AbEAEEmTZCAA8qjhAAfFCEANoAuhokAK7aqMAAljpQCdoA5hD68EjGWLoAFGQ5bMBmljb2Tq4eXr7Z-niBAJRQAN4AvgJkTFD5WnoGRiVQcCSGuaUtrUoJY-lDolAAhPhcRURTSlLAABZMcADuUNoQRwCinnBM+UQAqicAHpDxEHZQ+sjAEBvUUp2dVFSGSyMgmBQWeSaFCAA
I am unsure if this is a bug (I have raised an issue) or if there is another way to assert that all members of array are of certain type.
javascript flowtype
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
I have tried iterating the array using for..of and throwing an exception if the type does not match:
type FooPacketType = 'foo';
type BarPacketType = 'bar';
type PacketType =
FooPacketType |
BarPacketType;
const packets: $ReadOnlyArray<PacketType> = ;
function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
for (const packet of packets) {
if (packet !== 'foo') {
throw new Error('Unexpected state');
}
}
ingestFooPackets(packets);
This gives an error:
18: ingestFooPackets(packets);
^ Cannot call `ingestFooPackets` with `packets` bound to `fooPackets` because string literal `bar` [1] is incompatible with string literal `foo` [2] in array element.
References:
8: const packets: $ReadOnlyArray<PacketType> = ;
^ [1]
10: function ingestFooPackets(fooPackets: $ReadOnlyArray<FooPacketType>) {}
^ [2]
https://flow.org/try/#0C4TwDgpgBAYg9nACgQwMYGsLACrmgXigHIAzBIgbgChRIoAhZAJxQy1zsKICNnKqaeKK0w4h+KlFgIR7IQB9JDZrLGRqVVHAB2AZ2BQwaUboBcUACQAlCMgAmAeW0AbEAEEmTZCAA8qjhAAfFCEANoAuhokAK7aqMAAljpQCdoA5hD68EjGWLoAFGQ5bMBmljb2Tq4eXr7Z-niBAJRQAN4AvgJkTFD5WnoGRiVQcCSGuaUtrUoJY-lDolAAhPhcRURTSlLAABZMcADuUNoQRwCinnBM+UQAqicAHpDxEHZQ+sjAEBvUUp2dVFSGSyMgmBQWeSaFCAA
I am unsure if this is a bug (I have raised an issue) or if there is another way to assert that all members of array are of certain type.
javascript flowtype
javascript flowtype
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
edited Nov 13 '18 at 17:14
Gajus
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
asked Nov 13 '18 at 16:42
GajusGajus
29.3k36173311
29.3k36173311
add a comment |
add a comment |
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