refactor: strictly typed

src/render/syntax.ts

@@ -1,23 +1,25 @@
 import * as lexical from '../parser/lexical'
 import assert from '../util/assert'
+import Scope from 'src/scope/scope'
+import { range } from 'src/util/underscore'
 
 const operators = {
-  '==': (l, r) => l === r,
-  '!=': (l, r) => l !== r,
-  '>': (l, r) => l !== null && r !== null && l > r,
-  '<': (l, r) => l !== null && r !== null && l < r,
-  '>=': (l, r) => l !== null && r !== null && l >= r,
-  '<=': (l, r) => l !== null && r !== null && l <= r,
-  'contains': (l, r) => {
+  '==': (l: any, r: any) => l === r,
+  '!=': (l: any, r: any) => l !== r,
+  '>': (l: any, r: any) => l !== null && r !== null && l > r,
+  '<': (l: any, r: any) => l !== null && r !== null && l < r,
+  '>=': (l: any, r: any) => l !== null && r !== null && l >= r,
+  '<=': (l: any, r: any) => l !== null && r !== null && l <= r,
+  'contains': (l: any, r: any) => {
     if (!l) return false
     if (typeof l.indexOf !== 'function') return false
     return l.indexOf(r) > -1
   },
-  'and': (l, r) => isTruthy(l) && isTruthy(r),
-  'or': (l, r) => isTruthy(l) || isTruthy(r)
+  'and': (l: any, r: any) => isTruthy(l) && isTruthy(r),
+  'or': (l: any, r: any) => isTruthy(l) || isTruthy(r)
 }
 
-export function evalExp (exp, scope) {
+export function evalExp (exp: string, scope: Scope): any {
   assert(scope, 'unable to evalExp: scope undefined')
   const operatorREs = lexical.operators
   let match
@@ -35,17 +37,13 @@ export function evalExp (exp, scope) {
   if ((match = exp.match(lexical.rangeLine))) {
     const low = evalValue(match[1], scope)
     const high = evalValue(match[2], scope)
-    const range = []
-    for (let j = low; j <= high; j++) {
-      range.push(j)
-    }
-    return range
+    return range(low, high + 1)
   }
 
   return evalValue(exp, scope)
 }
 
-export function evalValue (str, scope) {
+export function evalValue (str: string, scope: Scope) {
   str = str && str.trim()
   if (!str) return undefined
 
@@ -58,10 +56,10 @@ export function evalValue (str, scope) {
   throw new TypeError(`cannot eval '${str}' as value`)
 }
 
-export function isTruthy (val) {
+export function isTruthy (val: any): boolean {
   return !isFalsy(val)
 }
 
-export function isFalsy (val) {
+export function isFalsy (val: any): boolean {
   return val === false || undefined === val || val === null
 }