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Permit undefined values to flow through

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This commit is contained in:
joeduffy 2017-09-06 09:39:16 -07:00
parent d8d94d1df0
commit 397fea5720
1 changed files with 14 additions and 18 deletions
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32
sdk/nodejs/runtime/property.ts
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@ -66,30 +66,26 @@ export class Property<T> implements Computed<T> {
else {
try {
// There's a callback; invoke it.
let u: MaybeComputed<U> | undefined;
try {
mapValueCallbackRecursionCount++;
u = callback(value);
let u: MaybeComputed<U> = callback(value);
// If this is another computed, we need to wire up to its resolution; else just store the value.
if (u && u instanceof Promise) {
u.then((v: U) => { result.setOutput(v, true, false); });
}
else if (u && (u as Computed<U>).mapValue) {
(u as Computed<U>).mapValue((v: U) => {
result.setOutput(v, true, false);
});
}
else {
result.setOutput(<U>u, true, false);
}
}
finally {
mapValueCallbackRecursionCount--;
}
if (u === undefined) {
throw new Error("MapValue yielded no result");
}
// If this is another computed, we need to wire up to its resolution; else just store the value.
if (u instanceof Promise) {
u.then((v: U) => { result.setOutput(v, true, false); });
}
else if ((u as Computed<U>).mapValue) {
(u as Computed<U>).mapValue((v: U) => {
result.setOutput(v, true, false);
});
}
else {
result.setOutput(<U>u, true, false);
}
}
catch (err) {
Log.error(`MapValue of a Computed yielded an unhandled error: ${err}`);