Enable the ESLint no-var rule in the src/core/font_renderer.js file
Note that the majority of these changes were done automatically, by using `gulp lint --fix`, and the manual changes were limited to the following diff:
```diff
diff --git a/src/core/font_renderer.js b/src/core/font_renderer.js
index e1538c481..00f5424cd 100644
--- a/src/core/font_renderer.js
+++ b/src/core/font_renderer.js
@@ -152,9 +152,9 @@ const FontRendererFactory = (function FontRendererFactoryClosure() {
}
function lookupCmap(ranges, unicode) {
- let code = unicode.codePointAt(0),
- gid = 0;
- let l = 0,
+ const code = unicode.codePointAt(0);
+ let gid = 0,
+ l = 0,
r = ranges.length - 1;
while (l < r) {
const c = (l + r + 1) >> 1;
@@ -199,7 +199,7 @@ const FontRendererFactory = (function FontRendererFactoryClosure() {
flags = (code[i] << 8) | code[i + 1];
const glyphIndex = (code[i + 2] << 8) | code[i + 3];
i += 4;
- var arg1, arg2;
+ let arg1, arg2;
if (flags & 0x01) {
arg1 = ((code[i] << 24) | (code[i + 1] << 16)) >> 16;
arg2 = ((code[i + 2] << 24) | (code[i + 3] << 16)) >> 16;
@@ -366,7 +366,7 @@ const FontRendererFactory = (function FontRendererFactoryClosure() {
while (i < code.length) {
let stackClean = false;
let v = code[i++];
- var xa, xb, ya, yb, y1, y2, y3, n, subrCode;
+ let xa, xb, ya, yb, y1, y2, y3, n, subrCode;
switch (v) {
case 1: // hstem
stems += stack.length >> 1;
@@ -494,7 +494,7 @@ const FontRendererFactory = (function FontRendererFactoryClosure() {
bezierCurveTo(xa, y2, xb, y3, x, y);
break;
case 37: // flex1
- var x0 = x,
+ const x0 = x,
y0 = y;
xa = x + stack.shift();
ya = y + stack.shift();
```
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