Maintain types for memoized functions

lib/common/expression-parser.ts

@@ -285,7 +285,7 @@ const lang = parsimmon.createLanguage({
   }
 });
 
-export function parse(str): Expression {
+export function parse(str: string): Expression {
   if (!str) return null;
   return lang.Expression.tryParse(str);
 }

lib/common/memoize.ts

@@ -20,9 +20,10 @@ function getKey(obj): string {
   return k;
 }
 
-export default function memoize(func): Function {
-  return (...args) => {
-    const key = JSON.stringify(args.map(getKey)) + getKey(func);
+export default function memoize<T extends Function>(func: T): T {
+  const funcKey = getKey(func);
+  return ((...args) => {
+    const key = JSON.stringify(args.map(getKey)) + funcKey;
 
     if (cache1.has(key)) return cache1.get(key);
 
@@ -31,7 +32,7 @@ export default function memoize(func): Function {
     else r = func(...args);
     cache1.set(key, r);
     return r;
-  };
+  }) as any;
 }
 
 const interval = setInterval(() => {

lib/soap.ts

@@ -127,7 +127,7 @@ function parameterInfoList(xml: Element): [string, boolean][] {
     });
 }
 
-const getValueType = memoize(str =>
+const getValueType = memoize((str: string) =>
   parseAttrs(str)
     .find(s => s.localName === "type")
     .value.trim()

lib/ui/api.ts

@@ -206,7 +206,7 @@ for (const [resource, flags] of Object.entries(resources)) {
     const now = Date.now();
 
     for (const [k, v] of Object.entries(columns)) {
-      const e = evaluate(parse(v), null, now);
+      const e = evaluate(parse(v as string), null, now);
       columns[k] = e;
       for (const p of extractParams(e)) options.projection[p] = 1;
     }