Fix several compilation errors with Typescript 2.2

package.json

@@ -85,4 +85,4 @@
     "strip-indent": "^2.0.0",
     "typescript": "^2.1.4"
   }
-}
+}

src/javascript/ast-value.ts

@@ -30,13 +30,13 @@ function unaryToValue(unary: estree.UnaryExpression): LiteralValue {
   const operand = expressionToValue(unary.argument);
   switch (unary.operator) {
     case '!':
-      return !operand;
+      return !(operand as any);
     case '-':
-      return -operand;
+      return -(operand as any);
     case '+':
-      return +operand;
+      return +(operand as any);
     case '~':
-      return ~operand;
+      return ~(operand as any);
     case 'typeof':
       return typeof operand;
     case 'void':

src/perf/parse-all-benchmark.ts

@@ -176,7 +176,7 @@ class Averager<K> {
 
   entries(): Iterable<[K, number]> {
     const entries = this.count.keys().map(
-        (k) => <[K, number]>[k, this.elapsed.get(k) / this.count.get(k)]);
+        (k) => <[K, number]>[k, this.elapsed.get(k)! / this.count.get(k)!]);
     return entries.sort((a, b) => a[1] - b[1]);
   }
 }

src/typescript/typescript-analyzer.ts

@@ -49,7 +49,7 @@ function isLibraryPath(filename: string) {
   return filename.startsWith('/$lib/');
 }
 
-const libraryCache = new Map<string, string>();
+const libraryCache = new Map<string, string|undefined>();
 function getLibrarySource(filePath: string) {
   if (libraryCache.has(filePath)) {
     return libraryCache.get(filePath);