The type system starts to infect the computation engine

app/imports/api/engine/computeCreature.ts

@@ -0,0 +1,48 @@
+import buildCreatureComputation from './computation/buildCreatureComputation';
+import computeCreatureComputation from './computation/computeCreatureComputation';
+import writeAlteredProperties from './computation/writeComputation/writeAlteredProperties';
+import writeScope from './computation/writeComputation/writeScope';
+import writeErrorsAndPropCount from './computation/writeComputation/writeErrorsAndPropCount';
+import type CreatureComputation from './computation/CreatureComputation';
+
+export default async function computeCreature(creatureId: string) {
+  if (Meteor.isClient) return;
+  // console.log('compute ' + creatureId);
+  const computation = buildCreatureComputation(creatureId);
+  await computeComputation(computation, creatureId);
+}
+
+async function computeComputation(computation: CreatureComputation, creatureId: string) {
+  try {
+    await computeCreatureComputation(computation);
+    const writePromise = writeAlteredProperties(computation);
+    const scopeWritePromise = writeScope(creatureId, computation);
+    await Promise.all([writePromise, scopeWritePromise]);
+  } catch (e: any) {
+    const errorText = e.reason || e.message || e.toString();
+    computation.errors.push({
+      type: 'crash',
+      details: { error: errorText },
+    });
+    console.error({
+      creatureId,
+      computeError: errorText,
+      ...e.stack && { location: e.stack.split('\n')[1] },
+    });
+  } finally {
+    checkPropertyCount(computation)
+    writeErrorsAndPropCount(creatureId, computation.errors, computation.props.length);
+  }
+}
+
+const MAX_PROPS = 1000;
+function checkPropertyCount(computation: CreatureComputation) {
+  const count = computation.props.length;
+  if (count <= MAX_PROPS) return;
+  computation.errors.push({
+    type: 'warning',
+    details: {
+      error: `This character sheet has too many properties and may perform poorly ( ${count} / ${MAX_PROPS} )`
+    },
+  });
+}