global-mercator - npm Package Compare versions

Comparing version 2.0.2 to 2.0.3

CHANGELOG.md

@@ -6,3 +6,4 @@
 
-- Convert project to support Rollup (ES6 next modules)
+- Convert to ES5
+- Convert project to support Rollup
 - Add `tileSize` @param 
@@ -9,0 +10,0 @@ - Dropped Grid methods (BREAKS backwards compatibility - Major release 2.X)

dist/global-mercator.browser.js

@@ -7,4 +7,7 @@ (function (global, factory) {
 
-const originShift = 2 * Math.PI * 6378137 / 2.0;
-function initialResolution (tileSize = 256) { return 2 * Math.PI * 6378137 / tileSize }
+var originShift = 2 * Math.PI * 6378137 / 2.0;
+function initialResolution (tileSize) {
+  tileSize = tileSize || 256;
+  return 2 * Math.PI * 6378137 / tileSize
+}
 
@@ -17,7 +20,9 @@ /**
  * @example
- * const id = hash([312, 480, 4])
+ * var id = hash([312, 480, 4])
  * //=5728
  */
 function hash (tile) {
-  const [x, y, z] = tile;
+  var x = tile[0];
+  var y = tile[1];
+  var z = tile[2];
   return (1 << z) * ((1 << z) + x) + y
@@ -32,9 +37,12 @@ }
  * @example
- * const center = bboxToCenter([90, -45, 85, -50])
+ * var center = bboxToCenter([90, -45, 85, -50])
  * //= [ 87.5, -47.5 ]
  */
 function bboxToCenter (bbox) {
-  const [west, south, east, north] = bbox;
-  let lng = (west - east) / 2 + east;
-  let lat = (south - north) / 2 + north;
+  var west = bbox[0];
+  var south = bbox[1];
+  var east = bbox[2];
+  var north = bbox[3];
+  var lng = (west - east) / 2 + east;
+  var lat = (south - north) / 2 + north;
   lng = Number(lng.toFixed(6));
@@ -51,9 +59,11 @@ lat = Number(lat.toFixed(6));
  * @example
- * const meters = lngLatToMeters([126, 37])
+ * var meters = lngLatToMeters([126, 37])
  * //=[ 14026255.8, 4439106.7 ]
  */
 function lngLatToMeters (lnglat) {
-  const [lng, lat] = validateLngLat(lnglat);
-  let x = lng * originShift / 180.0;
-  let y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
+  validateLngLat(lnglat);
+  var lng = lnglat[0];
+  var lat = lnglat[1];
+  var x = lng * originShift / 180.0;
+  var y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
   y = y * originShift / 180.0;
@@ -71,9 +81,10 @@ x = Number(x.toFixed(1));
  * @example
- * const lnglat = metersToLngLat([14026255, 4439106])
+ * var lnglat = metersToLngLat([14026255, 4439106])
  * //=[ 126, 37 ]
  */
 function metersToLngLat (meters) {
-  const [x, y] = meters;
-  let lng = (x / originShift) * 180.0;
-  let lat = (y / originShift) * 180.0;
+  var x = meters[0];
+  var y = meters[1];
+  var lng = (x / originShift) * 180.0;
+  var lat = (y / originShift) * 180.0;
   lat = 180 / Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180.0)) - Math.PI / 2.0);
@@ -93,10 +104,11 @@ lng = Number(lng.toFixed(6));
  * @example
- * const pixels = metersToPixels([14026255, 4439106], 13)
+ * var pixels = metersToPixels([14026255, 4439106], 13)
  * //=[ 1782579.1, 1280877.3, 13 ]
  */
 function metersToPixels (meters, zoom, tileSize) {
-  const [x, y] = meters;
-  const res = resolution(zoom, tileSize);
-  const px = (x + originShift) / res;
-  const py = (y + originShift) / res;
+  var x = meters[0];
+  var y = meters[1];
+  var res = resolution(zoom, tileSize);
+  var px = (x + originShift) / res;
+  var py = (y + originShift) / res;
   return [px, py, zoom]
@@ -112,8 +124,8 @@ }
  * @example
- * const tile = lngLatToTile([126, 37], 13)
+ * var tile = lngLatToTile([126, 37], 13)
  * //=[ 6963, 5003, 13 ]
  */
 function lngLatToTile (lnglat, zoom) {
-  const meters = lngLatToMeters(validateLngLat(lnglat));
-  const pixels = metersToPixels(meters, zoom);
+  var meters = lngLatToMeters(validateLngLat(lnglat));
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -129,3 +141,3 @@ }
  * @example
- * const google = lngLatToGoogle([126, 37], 13)
+ * var google = lngLatToGoogle([126, 37], 13)
  * //=[ 6963, 3188, 13 ]
@@ -137,3 +149,3 @@ */
   }
-  const tile = lngLatToTile(validateLngLat(lnglat), zoom);
+  var tile = lngLatToTile(validateLngLat(lnglat), zoom);
   return tileToGoogle(tile)
@@ -149,3 +161,3 @@ }
  * @example
- * const tile = metersToTile([14026255, 4439106], 13)
+ * var tile = metersToTile([14026255, 4439106], 13)
  * //=[ 6963, 5003, 13 ]
@@ -157,3 +169,3 @@ */
   }
-  const pixels = metersToPixels(meters, zoom);
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -169,10 +181,13 @@ }
  * @example
- * const meters = pixelsToMeters([1782579, 1280877, 13])
+ * var meters = pixelsToMeters([1782579, 1280877, 13])
  * //=[ 14026252.0, 4439099.5 ]
  */
 function pixelsToMeters (pixels, tileSize) {
-  const [px, py, zoom] = validatePixels(pixels);
-  const res = resolution(zoom, tileSize);
-  let mx = px * res - originShift;
-  let my = py * res - originShift;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
+  var res = resolution(zoom, tileSize);
+  var mx = px * res - originShift;
+  var my = py * res - originShift;
   mx = Number(mx.toFixed(1));
@@ -190,12 +205,16 @@ my = Number(my.toFixed(1));
  * @example
- * const tile = pixelsToTile([1782579, 1280877, 13])
+ * var tile = pixelsToTile([1782579, 1280877, 13])
  * //=[ 6963, 5003, 13 ]
  */
-function pixelsToTile (pixels, tileSize = 256) {
-  const [px, py, zoom] = validatePixels(pixels);
+function pixelsToTile (pixels, tileSize) {
+  tileSize = tileSize || 256;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  let tx = Math.ceil(px / tileSize) - 1;
-  let ty = Math.ceil(py / tileSize) - 1;
+  var tx = Math.ceil(px / tileSize) - 1;
+  var ty = Math.ceil(py / tileSize) - 1;
   if (tx < 0) {
@@ -220,9 +239,13 @@ tx = 0;
  * @example
- * const bbox = tileToBBoxMeters([6963, 5003, 13])
+ * var bbox = tileToBBoxMeters([6963, 5003, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
-function tileToBBoxMeters (tile, tileSize = 256) {
-  const [tx, ty, zoom] = validateTile(tile);
-  let min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
-  let max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
+function tileToBBoxMeters (tile, tileSize) {
+  tileSize = tileSize || 256;
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
+  var min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
+  var max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -240,13 +263,20 @@ }
  * @example
- * const bbox = tileToBBox([6963, 5003, 13])
+ * var bbox = tileToBBox([6963, 5003, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function tileToBBox (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [-180, -85.051129, 180, 85.051129]
   }
-  const [mx1, my1, mx2, my2] = tileToBBoxMeters([tx, ty, zoom]);
-  const min = metersToLngLat([mx1, my1, zoom]);
-  const max = metersToLngLat([mx2, my2, zoom]);
+  var bbox = tileToBBoxMeters([tx, ty, zoom]);
+  var mx1 = bbox[0];
+  var my1 = bbox[1];
+  var mx2 = bbox[2];
+  var my2 = bbox[3];
+  var min = metersToLngLat([mx1, my1, zoom]);
+  var max = metersToLngLat([mx2, my2, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -261,7 +291,7 @@ }
  * @example
- * const bbox = googleToBBoxMeters([6963, 3188, 13])
+ * var bbox = googleToBBoxMeters([6963, 3188, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
 function googleToBBoxMeters (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBoxMeters(Tile)
@@ -276,7 +306,7 @@ }
  * @example
- * const bbox = googleToBBox([6963, 3188, 13])
+ * var bbox = googleToBBox([6963, 3188, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function googleToBBox (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBox(Tile)
@@ -291,12 +321,15 @@ }
  * @example
- * const google = tileToGoogle([6963, 5003, 13])
+ * var google = tileToGoogle([6963, 5003, 13])
  * //=[ 6963, 3188, 13 ]
  */
 function tileToGoogle (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  const x = tx;
-  const y = (Math.pow(2, zoom) - 1) - ty;
+  var x = tx;
+  var y = (Math.pow(2, zoom) - 1) - ty;
   return [x, y, zoom]
@@ -311,9 +344,11 @@ }
  * @example
- * const tile = googleToTile([6963, 3188, 13])
+ * var tile = googleToTile([6963, 3188, 13])
  * //=[ 6963, 5003, 13 ]
  */
 function googleToTile (google) {
-  const [x, y, zoom] = google;
-  const tx = x;
-  const ty = Math.pow(2, zoom) - y - 1;
+  var x = google[0];
+  var y = google[1];
+  var zoom = google[2];
+  var tx = x;
+  var ty = Math.pow(2, zoom) - y - 1;
   return [tx, ty, zoom]
@@ -328,7 +363,7 @@ }
  * @example
- * const quadkey = googleToQuadkey([6963, 3188, 13])
+ * var quadkey = googleToQuadkey([6963, 3188, 13])
  * //='1321102330211'
  */
 function googleToQuadkey (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToQuadkey(Tile)
@@ -343,7 +378,10 @@ }
  * @example
- * const quadkey = tileToQuadkey([6963, 5003, 13])
+ * var quadkey = tileToQuadkey([6963, 5003, 13])
  * //='1321102330211'
  */
 function tileToQuadkey (tile) {
-  let [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   // Zoom 0 does not exist for Quadkey
@@ -353,7 +391,7 @@ if (zoom === 0) {
   }
-  let quadkey = '';
+  var quadkey = '';
   ty = (Math.pow(2, zoom) - 1) - ty;
-  range(zoom, 0, -1).map(i => {
-    let digit = 0;
-    let mask = 1 << (i - 1);
+  range(zoom, 0, -1).map(function (i) {
+    var digit = 0;
+    var mask = 1 << (i - 1);
     if ((tx & mask) !== 0) {
@@ -376,7 +414,7 @@ digit += 1;
  * @example
- * const tile = quadkeyToTile('1321102330211')
+ * var tile = quadkeyToTile('1321102330211')
  * //=[ 6963, 5003, 13 ]
  */
 function quadkeyToTile (quadkey) {
-  const Google = quadkeyToGoogle(quadkey);
+  var Google = quadkeyToGoogle(quadkey);
   return googleToTile(Google)
@@ -391,11 +429,11 @@ }
  * @example
- * const google = quadkeyToGoogle('1321102330211')
+ * var google = quadkeyToGoogle('1321102330211')
  * //=[ 6963, 3188, 13 ]
  */
 function quadkeyToGoogle (quadkey) {
-  let x = 0;
-  let y = 0;
-  const zoom = quadkey.length;
-  range(zoom, 0, -1).map(i => {
-    let mask = 1 << (i - 1);
+  var x = 0;
+  var y = 0;
+  var zoom = quadkey.length;
+  range(zoom, 0, -1).map(function (i) {
+    var mask = 1 << (i - 1);
     switch (parseInt(quadkey[zoom - i], 0)) {
@@ -427,8 +465,8 @@ case 0:
  * @example
- * const meters = bboxToMeters([ 125, 35, 127, 37 ])
+ * var meters = bboxToMeters([ 125, 35, 127, 37 ])
  * //=[ 13914936.3, 4163881.1, 14137575.3, 4439106.7 ]
  */
 function bboxToMeters (bbox) {
-  const min = lngLatToMeters([bbox[0], bbox[1]]);
-  const max = lngLatToMeters([bbox[2], bbox[3]]);
+  var min = lngLatToMeters([bbox[0], bbox[1]]);
+  var max = lngLatToMeters([bbox[2], bbox[3]]);
   return [min[0], min[1], max[0], max[1]]
@@ -452,3 +490,5 @@ }
 function validateTile (tile) {
-  const [tx, ty, zoom] = tile;
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   validateZoom(zoom);
@@ -459,3 +499,3 @@ if (tx === undefined || tx === null) { throw new Error('<x> is required') }
   if (ty < 0) { throw new Error('<y> must not be less than 0') }
-  const maxCount = Math.pow(2, zoom);
+  var maxCount = Math.pow(2, zoom);
   if (tx >= maxCount || ty >= maxCount) { throw new Error('Illegal parameters for tile') }
@@ -499,3 +539,4 @@ return tile
 function validateLngLat (lnglat) {
-  const [lng, lat] = lnglat;
+  var lng = lnglat[0];
+  var lat = lnglat[1];
   if (lat === undefined || lat === null) { throw new Error('<lat> is required') }
@@ -533,3 +574,3 @@ if (lng === undefined || lng === null) { throw new Error('<lng> is required') }
  * @example
- * const res = resolution(13)
+ * var res = resolution(13)
  * //=19.109257071294063
@@ -565,5 +606,5 @@ */
   }
-  const length = Math.max(Math.ceil((stop - start) / step), 0);
-  const range = Array(length);
-  for (let idx = 0; idx < length; idx++, start += step) {
+  var length = Math.max(Math.ceil((stop - start) / step), 0);
+  var range = Array(length);
+  for (var idx = 0; idx < length; idx++, start += step) {
     range[idx] = start;
@@ -570,0 +611,0 @@ }

dist/global-mercator.browser.min.js

@@ -1,1 +0,1 @@
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.globalMercator=t.globalMercator||{})}(this,function(t){"use strict";function e(t=256){return 2*Math.PI*6378137/t}function n(t){const[e,n,o]=t;return(1<<o)*((1<<o)+e)+n}function o(t){const[e,n,o,r]=t;let i=(e-o)/2+o,u=(n-r)/2+r;return i=Number(i.toFixed(6)),u=Number(u.toFixed(6)),[i,u]}function r(t){const[e,n]=L(t);let o=e*q/180,r=Math.log(Math.tan((90+n)*Math.PI/360))/(Math.PI/180);return r=r*q/180,o=Number(o.toFixed(1)),r=Number(r.toFixed(1)),[o,r]}function i(t){const[e,n]=t;let o=e/q*180,r=n/q*180;return r=180/Math.PI*(2*Math.atan(Math.exp(r*Math.PI/180))-Math.PI/2),o=Number(o.toFixed(6)),r=Number(r.toFixed(6)),[o,r]}function u(t,e,n){const[o,r]=t,i=P(e,n),u=(o+q)/i,a=(r+q)/i;return[u,a,e]}function a(t,e){const n=r(L(t)),o=u(n,e);return f(o)}function c(t,e){if(0===e)return[0,0,0];const n=a(L(t),e);return M(n)}function s(t,e){if(0===e)return[0,0,0];const n=u(t,e);return f(n)}function l(t,e){const[n,o,r]=I(t),i=P(r,e);let u=n*i-q,a=o*i-q;return u=Number(u.toFixed(1)),a=Number(a.toFixed(1)),[u,a]}function f(t,e=256){const[n,o,r]=I(t);if(0===r)return[0,0,0];let i=Math.ceil(n/e)-1,u=Math.ceil(o/e)-1;return i<0&&(i=0),u<0&&(u=0),[i,u,r]}function h(t,e=256){const[n,o,r]=y(t);let i=l([n*e,o*e,r]),u=l([(n+1)*e,(o+1)*e,r]);return[i[0],i[1],u[0],u[1]]}function d(t){const[e,n,o]=y(t);if(0===o)return[-180,-85.051129,180,85.051129];const[r,u,a,c]=h([e,n,o]),s=i([r,u,o]),l=i([a,c,o]);return[s[0],s[1],l[0],l[1]]}function w(t){const e=b(t);return h(e)}function g(t){const e=b(t);return d(e)}function M(t){const[e,n,o]=y(t);if(0===o)return[0,0,0];const r=e,i=Math.pow(2,o)-1-n;return[r,i,o]}function b(t){const[e,n,o]=t,r=e,i=Math.pow(2,o)-n-1;return[r,i,o]}function T(t){const e=b(t);return m(e)}function m(t){let[e,n,o]=y(t);if(0===o)return"";let r="";return n=Math.pow(2,o)-1-n,k(o,0,-1).map(t=>{let o=0,i=1<<t-1;0!==(e&i)&&(o+=1),0!==(n&i)&&(o+=2),r=r.concat(o)}),r}function x(t){const e=p(t);return b(e)}function p(t){let e=0,n=0;const o=t.length;return k(o,0,-1).map(r=>{let i=1<<r-1;switch(parseInt(t[o-r],0)){case 0:break;case 1:e+=i;break;case 2:n+=i;break;case 3:e+=i,n+=i;break;default:throw new Error("Invalid Quadkey digit sequence")}}),[e,n,o]}function E(t){const e=r([t[0],t[1]]),n=r([t[2],t[3]]);return[e[0],e[1],n[0],n[1]]}function y(t){const[e,n,o]=t;if(v(o),void 0===e||null===e)throw new Error("<x> is required");if(void 0===n||null===n)throw new Error("<y> is required");if(e<0)throw new Error("<x> must not be less than 0");if(n<0)throw new Error("<y> must not be less than 0");const r=Math.pow(2,o);if(e>=r||n>=r)throw new Error("Illegal parameters for tile");return t}function v(t){if(void 0===t||null===t)throw new Error("<zoom> is required");if(t<0)throw new Error("<zoom> cannot be less than 0");if(t>30)throw new Error("<zoom> cannot be greater than 30");return t}function L(t){const[e,n]=t;if(void 0===n||null===n)throw new Error("<lat> is required");if(void 0===e||null===e)throw new Error("<lng> is required");if(n<-90||n>90)throw new Error("LngLat <lat> must be within -90 to 90 degrees");if(e<-180||e>180)throw new Error("LngLat <lng> must be within -180 to 180 degrees");return[e,n]}function I(t){return t}function P(t,n){return e(n)/Math.pow(2,t)}function k(t,e,n){null==e&&(e=t||0,t=0),n||(n=e<t?-1:1);const o=Math.max(Math.ceil((e-t)/n),0),r=Array(o);for(let i=0;i<o;i++,t+=n)r[i]=t;return r}const q=2*Math.PI*6378137/2;t.hash=n,t.bboxToCenter=o,t.lngLatToMeters=r,t.metersToLngLat=i,t.metersToPixels=u,t.lngLatToTile=a,t.lngLatToGoogle=c,t.metersToTile=s,t.pixelsToMeters=l,t.pixelsToTile=f,t.tileToBBoxMeters=h,t.tileToBBox=d,t.googleToBBoxMeters=w,t.googleToBBox=g,t.tileToGoogle=M,t.googleToTile=b,t.googleToQuadkey=T,t.tileToQuadkey=m,t.quadkeyToTile=x,t.quadkeyToGoogle=p,t.bboxToMeters=E,t.validateTile=y,t.validateZoom=v,t.validateLngLat=L,t.validatePixels=I,t.resolution=P,t.range=k,Object.defineProperty(t,"__esModule",{value:!0})});
+!function(r,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(r.globalMercator=r.globalMercator||{})}(this,function(r){"use strict";function e(r){return r=r||256,2*Math.PI*6378137/r}function t(r){var e=r[0],t=r[1],n=r[2];return(1<<n)*((1<<n)+e)+t}function n(r){var e=r[0],t=r[1],n=r[2],o=r[3],i=(e-n)/2+n,a=(t-o)/2+o;return i=Number(i.toFixed(6)),a=Number(a.toFixed(6)),[i,a]}function o(r){L(r);var e=r[0],t=r[1],n=e*q/180,o=Math.log(Math.tan((90+t)*Math.PI/360))/(Math.PI/180);return o=o*q/180,n=Number(n.toFixed(1)),o=Number(o.toFixed(1)),[n,o]}function i(r){var e=r[0],t=r[1],n=e/q*180,o=t/q*180;return o=180/Math.PI*(2*Math.atan(Math.exp(o*Math.PI/180))-Math.PI/2),n=Number(n.toFixed(6)),o=Number(o.toFixed(6)),[n,o]}function a(r,e,t){var n=r[0],o=r[1],i=P(e,t),a=(n+q)/i,u=(o+q)/i;return[a,u,e]}function u(r,e){var t=o(L(r)),n=a(t,e);return s(n)}function l(r,e){if(0===e)return[0,0,0];var t=u(L(r),e);return g(t)}function f(r,e){if(0===e)return[0,0,0];var t=a(r,e);return s(t)}function c(r,e){I(r);var t=r[0],n=r[1],o=r[2],i=P(o,e),a=t*i-q,u=n*i-q;return a=Number(a.toFixed(1)),u=Number(u.toFixed(1)),[a,u]}function s(r,e){e=e||256,I(r);var t=r[0],n=r[1],o=r[2];if(0===o)return[0,0,0];var i=Math.ceil(t/e)-1,a=Math.ceil(n/e)-1;return i<0&&(i=0),a<0&&(a=0),[i,a,o]}function h(r,e){e=e||256,E(r);var t=r[0],n=r[1],o=r[2],i=c([t*e,n*e,o]),a=c([(t+1)*e,(n+1)*e,o]);return[i[0],i[1],a[0],a[1]]}function v(r){E(r);var e=r[0],t=r[1],n=r[2];if(0===n)return[-180,-85.051129,180,85.051129];var o=h([e,t,n]),a=o[0],u=o[1],l=o[2],f=o[3],c=i([a,u,n]),s=i([l,f,n]);return[c[0],c[1],s[0],s[1]]}function d(r){var e=M(r);return h(e)}function w(r){var e=M(r);return v(e)}function g(r){E(r);var e=r[0],t=r[1],n=r[2];if(0===n)return[0,0,0];var o=e,i=Math.pow(2,n)-1-t;return[o,i,n]}function M(r){var e=r[0],t=r[1],n=r[2],o=e,i=Math.pow(2,n)-t-1;return[o,i,n]}function b(r){var e=M(r);return T(e)}function T(r){E(r);var e=r[0],t=r[1],n=r[2];if(0===n)return"";var o="";return t=Math.pow(2,n)-1-t,k(n,0,-1).map(function(r){var n=0,i=1<<r-1;0!==(e&i)&&(n+=1),0!==(t&i)&&(n+=2),o=o.concat(n)}),o}function m(r){var e=x(r);return M(e)}function x(r){var e=0,t=0,n=r.length;return k(n,0,-1).map(function(o){var i=1<<o-1;switch(parseInt(r[n-o],0)){case 0:break;case 1:e+=i;break;case 2:t+=i;break;case 3:e+=i,t+=i;break;default:throw new Error("Invalid Quadkey digit sequence")}}),[e,t,n]}function p(r){var e=o([r[0],r[1]]),t=o([r[2],r[3]]);return[e[0],e[1],t[0],t[1]]}function E(r){var e=r[0],t=r[1],n=r[2];if(y(n),void 0===e||null===e)throw new Error("<x> is required");if(void 0===t||null===t)throw new Error("<y> is required");if(e<0)throw new Error("<x> must not be less than 0");if(t<0)throw new Error("<y> must not be less than 0");var o=Math.pow(2,n);if(e>=o||t>=o)throw new Error("Illegal parameters for tile");return r}function y(r){if(void 0===r||null===r)throw new Error("<zoom> is required");if(r<0)throw new Error("<zoom> cannot be less than 0");if(r>30)throw new Error("<zoom> cannot be greater than 30");return r}function L(r){var e=r[0],t=r[1];if(void 0===t||null===t)throw new Error("<lat> is required");if(void 0===e||null===e)throw new Error("<lng> is required");if(t<-90||t>90)throw new Error("LngLat <lat> must be within -90 to 90 degrees");if(e<-180||e>180)throw new Error("LngLat <lng> must be within -180 to 180 degrees");return[e,t]}function I(r){return r}function P(r,t){return e(t)/Math.pow(2,r)}function k(r,e,t){null==e&&(e=r||0,r=0),t||(t=e<r?-1:1);for(var n=Math.max(Math.ceil((e-r)/t),0),o=Array(n),i=0;i<n;i++,r+=t)o[i]=r;return o}var q=2*Math.PI*6378137/2;r.hash=t,r.bboxToCenter=n,r.lngLatToMeters=o,r.metersToLngLat=i,r.metersToPixels=a,r.lngLatToTile=u,r.lngLatToGoogle=l,r.metersToTile=f,r.pixelsToMeters=c,r.pixelsToTile=s,r.tileToBBoxMeters=h,r.tileToBBox=v,r.googleToBBoxMeters=d,r.googleToBBox=w,r.tileToGoogle=g,r.googleToTile=M,r.googleToQuadkey=b,r.tileToQuadkey=T,r.quadkeyToTile=m,r.quadkeyToGoogle=x,r.bboxToMeters=p,r.validateTile=E,r.validateZoom=y,r.validateLngLat=L,r.validatePixels=I,r.resolution=P,r.range=k,Object.defineProperty(r,"__esModule",{value:!0})});

dist/global-mercator.es.js

@@ -1,3 +0,6 @@
-const originShift = 2 * Math.PI * 6378137 / 2.0;
-function initialResolution (tileSize = 256) { return 2 * Math.PI * 6378137 / tileSize }
+var originShift = 2 * Math.PI * 6378137 / 2.0;
+function initialResolution (tileSize) {
+  tileSize = tileSize || 256;
+  return 2 * Math.PI * 6378137 / tileSize
+}
 
@@ -10,7 +13,9 @@ /**
  * @example
- * const id = hash([312, 480, 4])
+ * var id = hash([312, 480, 4])
  * //=5728
  */
 function hash (tile) {
-  const [x, y, z] = tile;
+  var x = tile[0];
+  var y = tile[1];
+  var z = tile[2];
   return (1 << z) * ((1 << z) + x) + y
@@ -25,9 +30,12 @@ }
  * @example
- * const center = bboxToCenter([90, -45, 85, -50])
+ * var center = bboxToCenter([90, -45, 85, -50])
  * //= [ 87.5, -47.5 ]
  */
 function bboxToCenter (bbox) {
-  const [west, south, east, north] = bbox;
-  let lng = (west - east) / 2 + east;
-  let lat = (south - north) / 2 + north;
+  var west = bbox[0];
+  var south = bbox[1];
+  var east = bbox[2];
+  var north = bbox[3];
+  var lng = (west - east) / 2 + east;
+  var lat = (south - north) / 2 + north;
   lng = Number(lng.toFixed(6));
@@ -44,9 +52,11 @@ lat = Number(lat.toFixed(6));
  * @example
- * const meters = lngLatToMeters([126, 37])
+ * var meters = lngLatToMeters([126, 37])
  * //=[ 14026255.8, 4439106.7 ]
  */
 function lngLatToMeters (lnglat) {
-  const [lng, lat] = validateLngLat(lnglat);
-  let x = lng * originShift / 180.0;
-  let y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
+  validateLngLat(lnglat);
+  var lng = lnglat[0];
+  var lat = lnglat[1];
+  var x = lng * originShift / 180.0;
+  var y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
   y = y * originShift / 180.0;
@@ -64,9 +74,10 @@ x = Number(x.toFixed(1));
  * @example
- * const lnglat = metersToLngLat([14026255, 4439106])
+ * var lnglat = metersToLngLat([14026255, 4439106])
  * //=[ 126, 37 ]
  */
 function metersToLngLat (meters) {
-  const [x, y] = meters;
-  let lng = (x / originShift) * 180.0;
-  let lat = (y / originShift) * 180.0;
+  var x = meters[0];
+  var y = meters[1];
+  var lng = (x / originShift) * 180.0;
+  var lat = (y / originShift) * 180.0;
   lat = 180 / Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180.0)) - Math.PI / 2.0);
@@ -86,10 +97,11 @@ lng = Number(lng.toFixed(6));
  * @example
- * const pixels = metersToPixels([14026255, 4439106], 13)
+ * var pixels = metersToPixels([14026255, 4439106], 13)
  * //=[ 1782579.1, 1280877.3, 13 ]
  */
 function metersToPixels (meters, zoom, tileSize) {
-  const [x, y] = meters;
-  const res = resolution(zoom, tileSize);
-  const px = (x + originShift) / res;
-  const py = (y + originShift) / res;
+  var x = meters[0];
+  var y = meters[1];
+  var res = resolution(zoom, tileSize);
+  var px = (x + originShift) / res;
+  var py = (y + originShift) / res;
   return [px, py, zoom]
@@ -105,8 +117,8 @@ }
  * @example
- * const tile = lngLatToTile([126, 37], 13)
+ * var tile = lngLatToTile([126, 37], 13)
  * //=[ 6963, 5003, 13 ]
  */
 function lngLatToTile (lnglat, zoom) {
-  const meters = lngLatToMeters(validateLngLat(lnglat));
-  const pixels = metersToPixels(meters, zoom);
+  var meters = lngLatToMeters(validateLngLat(lnglat));
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -122,3 +134,3 @@ }
  * @example
- * const google = lngLatToGoogle([126, 37], 13)
+ * var google = lngLatToGoogle([126, 37], 13)
  * //=[ 6963, 3188, 13 ]
@@ -130,3 +142,3 @@ */
   }
-  const tile = lngLatToTile(validateLngLat(lnglat), zoom);
+  var tile = lngLatToTile(validateLngLat(lnglat), zoom);
   return tileToGoogle(tile)
@@ -142,3 +154,3 @@ }
  * @example
- * const tile = metersToTile([14026255, 4439106], 13)
+ * var tile = metersToTile([14026255, 4439106], 13)
  * //=[ 6963, 5003, 13 ]
@@ -150,3 +162,3 @@ */
   }
-  const pixels = metersToPixels(meters, zoom);
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -162,10 +174,13 @@ }
  * @example
- * const meters = pixelsToMeters([1782579, 1280877, 13])
+ * var meters = pixelsToMeters([1782579, 1280877, 13])
  * //=[ 14026252.0, 4439099.5 ]
  */
 function pixelsToMeters (pixels, tileSize) {
-  const [px, py, zoom] = validatePixels(pixels);
-  const res = resolution(zoom, tileSize);
-  let mx = px * res - originShift;
-  let my = py * res - originShift;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
+  var res = resolution(zoom, tileSize);
+  var mx = px * res - originShift;
+  var my = py * res - originShift;
   mx = Number(mx.toFixed(1));
@@ -183,12 +198,16 @@ my = Number(my.toFixed(1));
  * @example
- * const tile = pixelsToTile([1782579, 1280877, 13])
+ * var tile = pixelsToTile([1782579, 1280877, 13])
  * //=[ 6963, 5003, 13 ]
  */
-function pixelsToTile (pixels, tileSize = 256) {
-  const [px, py, zoom] = validatePixels(pixels);
+function pixelsToTile (pixels, tileSize) {
+  tileSize = tileSize || 256;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  let tx = Math.ceil(px / tileSize) - 1;
-  let ty = Math.ceil(py / tileSize) - 1;
+  var tx = Math.ceil(px / tileSize) - 1;
+  var ty = Math.ceil(py / tileSize) - 1;
   if (tx < 0) {
@@ -213,9 +232,13 @@ tx = 0;
  * @example
- * const bbox = tileToBBoxMeters([6963, 5003, 13])
+ * var bbox = tileToBBoxMeters([6963, 5003, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
-function tileToBBoxMeters (tile, tileSize = 256) {
-  const [tx, ty, zoom] = validateTile(tile);
-  let min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
-  let max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
+function tileToBBoxMeters (tile, tileSize) {
+  tileSize = tileSize || 256;
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
+  var min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
+  var max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -233,13 +256,20 @@ }
  * @example
- * const bbox = tileToBBox([6963, 5003, 13])
+ * var bbox = tileToBBox([6963, 5003, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function tileToBBox (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [-180, -85.051129, 180, 85.051129]
   }
-  const [mx1, my1, mx2, my2] = tileToBBoxMeters([tx, ty, zoom]);
-  const min = metersToLngLat([mx1, my1, zoom]);
-  const max = metersToLngLat([mx2, my2, zoom]);
+  var bbox = tileToBBoxMeters([tx, ty, zoom]);
+  var mx1 = bbox[0];
+  var my1 = bbox[1];
+  var mx2 = bbox[2];
+  var my2 = bbox[3];
+  var min = metersToLngLat([mx1, my1, zoom]);
+  var max = metersToLngLat([mx2, my2, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -254,7 +284,7 @@ }
  * @example
- * const bbox = googleToBBoxMeters([6963, 3188, 13])
+ * var bbox = googleToBBoxMeters([6963, 3188, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
 function googleToBBoxMeters (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBoxMeters(Tile)
@@ -269,7 +299,7 @@ }
  * @example
- * const bbox = googleToBBox([6963, 3188, 13])
+ * var bbox = googleToBBox([6963, 3188, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function googleToBBox (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBox(Tile)
@@ -284,12 +314,15 @@ }
  * @example
- * const google = tileToGoogle([6963, 5003, 13])
+ * var google = tileToGoogle([6963, 5003, 13])
  * //=[ 6963, 3188, 13 ]
  */
 function tileToGoogle (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  const x = tx;
-  const y = (Math.pow(2, zoom) - 1) - ty;
+  var x = tx;
+  var y = (Math.pow(2, zoom) - 1) - ty;
   return [x, y, zoom]
@@ -304,9 +337,11 @@ }
  * @example
- * const tile = googleToTile([6963, 3188, 13])
+ * var tile = googleToTile([6963, 3188, 13])
  * //=[ 6963, 5003, 13 ]
  */
 function googleToTile (google) {
-  const [x, y, zoom] = google;
-  const tx = x;
-  const ty = Math.pow(2, zoom) - y - 1;
+  var x = google[0];
+  var y = google[1];
+  var zoom = google[2];
+  var tx = x;
+  var ty = Math.pow(2, zoom) - y - 1;
   return [tx, ty, zoom]
@@ -321,7 +356,7 @@ }
  * @example
- * const quadkey = googleToQuadkey([6963, 3188, 13])
+ * var quadkey = googleToQuadkey([6963, 3188, 13])
  * //='1321102330211'
  */
 function googleToQuadkey (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToQuadkey(Tile)
@@ -336,7 +371,10 @@ }
  * @example
- * const quadkey = tileToQuadkey([6963, 5003, 13])
+ * var quadkey = tileToQuadkey([6963, 5003, 13])
  * //='1321102330211'
  */
 function tileToQuadkey (tile) {
-  let [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   // Zoom 0 does not exist for Quadkey
@@ -346,7 +384,7 @@ if (zoom === 0) {
   }
-  let quadkey = '';
+  var quadkey = '';
   ty = (Math.pow(2, zoom) - 1) - ty;
-  range(zoom, 0, -1).map(i => {
-    let digit = 0;
-    let mask = 1 << (i - 1);
+  range(zoom, 0, -1).map(function (i) {
+    var digit = 0;
+    var mask = 1 << (i - 1);
     if ((tx & mask) !== 0) {
@@ -369,7 +407,7 @@ digit += 1;
  * @example
- * const tile = quadkeyToTile('1321102330211')
+ * var tile = quadkeyToTile('1321102330211')
  * //=[ 6963, 5003, 13 ]
  */
 function quadkeyToTile (quadkey) {
-  const Google = quadkeyToGoogle(quadkey);
+  var Google = quadkeyToGoogle(quadkey);
   return googleToTile(Google)
@@ -384,11 +422,11 @@ }
  * @example
- * const google = quadkeyToGoogle('1321102330211')
+ * var google = quadkeyToGoogle('1321102330211')
  * //=[ 6963, 3188, 13 ]
  */
 function quadkeyToGoogle (quadkey) {
-  let x = 0;
-  let y = 0;
-  const zoom = quadkey.length;
-  range(zoom, 0, -1).map(i => {
-    let mask = 1 << (i - 1);
+  var x = 0;
+  var y = 0;
+  var zoom = quadkey.length;
+  range(zoom, 0, -1).map(function (i) {
+    var mask = 1 << (i - 1);
     switch (parseInt(quadkey[zoom - i], 0)) {
@@ -420,8 +458,8 @@ case 0:
  * @example
- * const meters = bboxToMeters([ 125, 35, 127, 37 ])
+ * var meters = bboxToMeters([ 125, 35, 127, 37 ])
  * //=[ 13914936.3, 4163881.1, 14137575.3, 4439106.7 ]
  */
 function bboxToMeters (bbox) {
-  const min = lngLatToMeters([bbox[0], bbox[1]]);
-  const max = lngLatToMeters([bbox[2], bbox[3]]);
+  var min = lngLatToMeters([bbox[0], bbox[1]]);
+  var max = lngLatToMeters([bbox[2], bbox[3]]);
   return [min[0], min[1], max[0], max[1]]
@@ -445,3 +483,5 @@ }
 function validateTile (tile) {
-  const [tx, ty, zoom] = tile;
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   validateZoom(zoom);
@@ -452,3 +492,3 @@ if (tx === undefined || tx === null) { throw new Error('<x> is required') }
   if (ty < 0) { throw new Error('<y> must not be less than 0') }
-  const maxCount = Math.pow(2, zoom);
+  var maxCount = Math.pow(2, zoom);
   if (tx >= maxCount || ty >= maxCount) { throw new Error('Illegal parameters for tile') }
@@ -492,3 +532,4 @@ return tile
 function validateLngLat (lnglat) {
-  const [lng, lat] = lnglat;
+  var lng = lnglat[0];
+  var lat = lnglat[1];
   if (lat === undefined || lat === null) { throw new Error('<lat> is required') }
@@ -526,3 +567,3 @@ if (lng === undefined || lng === null) { throw new Error('<lng> is required') }
  * @example
- * const res = resolution(13)
+ * var res = resolution(13)
  * //=19.109257071294063
@@ -558,5 +599,5 @@ */
   }
-  const length = Math.max(Math.ceil((stop - start) / step), 0);
-  const range = Array(length);
-  for (let idx = 0; idx < length; idx++, start += step) {
+  var length = Math.max(Math.ceil((stop - start) / step), 0);
+  var range = Array(length);
+  for (var idx = 0; idx < length; idx++, start += step) {
     range[idx] = start;
@@ -563,0 +604,0 @@ }

dist/global-mercator.js

@@ -5,4 +5,7 @@ 'use strict';
 
-const originShift = 2 * Math.PI * 6378137 / 2.0;
-function initialResolution (tileSize = 256) { return 2 * Math.PI * 6378137 / tileSize }
+var originShift = 2 * Math.PI * 6378137 / 2.0;
+function initialResolution (tileSize) {
+  tileSize = tileSize || 256;
+  return 2 * Math.PI * 6378137 / tileSize
+}
 
@@ -15,7 +18,9 @@ /**
  * @example
- * const id = hash([312, 480, 4])
+ * var id = hash([312, 480, 4])
  * //=5728
  */
 function hash (tile) {
-  const [x, y, z] = tile;
+  var x = tile[0];
+  var y = tile[1];
+  var z = tile[2];
   return (1 << z) * ((1 << z) + x) + y
@@ -30,9 +35,12 @@ }
  * @example
- * const center = bboxToCenter([90, -45, 85, -50])
+ * var center = bboxToCenter([90, -45, 85, -50])
  * //= [ 87.5, -47.5 ]
  */
 function bboxToCenter (bbox) {
-  const [west, south, east, north] = bbox;
-  let lng = (west - east) / 2 + east;
-  let lat = (south - north) / 2 + north;
+  var west = bbox[0];
+  var south = bbox[1];
+  var east = bbox[2];
+  var north = bbox[3];
+  var lng = (west - east) / 2 + east;
+  var lat = (south - north) / 2 + north;
   lng = Number(lng.toFixed(6));
@@ -49,9 +57,11 @@ lat = Number(lat.toFixed(6));
  * @example
- * const meters = lngLatToMeters([126, 37])
+ * var meters = lngLatToMeters([126, 37])
  * //=[ 14026255.8, 4439106.7 ]
  */
 function lngLatToMeters (lnglat) {
-  const [lng, lat] = validateLngLat(lnglat);
-  let x = lng * originShift / 180.0;
-  let y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
+  validateLngLat(lnglat);
+  var lng = lnglat[0];
+  var lat = lnglat[1];
+  var x = lng * originShift / 180.0;
+  var y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
   y = y * originShift / 180.0;
@@ -69,9 +79,10 @@ x = Number(x.toFixed(1));
  * @example
- * const lnglat = metersToLngLat([14026255, 4439106])
+ * var lnglat = metersToLngLat([14026255, 4439106])
  * //=[ 126, 37 ]
  */
 function metersToLngLat (meters) {
-  const [x, y] = meters;
-  let lng = (x / originShift) * 180.0;
-  let lat = (y / originShift) * 180.0;
+  var x = meters[0];
+  var y = meters[1];
+  var lng = (x / originShift) * 180.0;
+  var lat = (y / originShift) * 180.0;
   lat = 180 / Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180.0)) - Math.PI / 2.0);
@@ -91,10 +102,11 @@ lng = Number(lng.toFixed(6));
  * @example
- * const pixels = metersToPixels([14026255, 4439106], 13)
+ * var pixels = metersToPixels([14026255, 4439106], 13)
  * //=[ 1782579.1, 1280877.3, 13 ]
  */
 function metersToPixels (meters, zoom, tileSize) {
-  const [x, y] = meters;
-  const res = resolution(zoom, tileSize);
-  const px = (x + originShift) / res;
-  const py = (y + originShift) / res;
+  var x = meters[0];
+  var y = meters[1];
+  var res = resolution(zoom, tileSize);
+  var px = (x + originShift) / res;
+  var py = (y + originShift) / res;
   return [px, py, zoom]
@@ -110,8 +122,8 @@ }
  * @example
- * const tile = lngLatToTile([126, 37], 13)
+ * var tile = lngLatToTile([126, 37], 13)
  * //=[ 6963, 5003, 13 ]
  */
 function lngLatToTile (lnglat, zoom) {
-  const meters = lngLatToMeters(validateLngLat(lnglat));
-  const pixels = metersToPixels(meters, zoom);
+  var meters = lngLatToMeters(validateLngLat(lnglat));
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -127,3 +139,3 @@ }
  * @example
- * const google = lngLatToGoogle([126, 37], 13)
+ * var google = lngLatToGoogle([126, 37], 13)
  * //=[ 6963, 3188, 13 ]
@@ -135,3 +147,3 @@ */
   }
-  const tile = lngLatToTile(validateLngLat(lnglat), zoom);
+  var tile = lngLatToTile(validateLngLat(lnglat), zoom);
   return tileToGoogle(tile)
@@ -147,3 +159,3 @@ }
  * @example
- * const tile = metersToTile([14026255, 4439106], 13)
+ * var tile = metersToTile([14026255, 4439106], 13)
  * //=[ 6963, 5003, 13 ]
@@ -155,3 +167,3 @@ */
   }
-  const pixels = metersToPixels(meters, zoom);
+  var pixels = metersToPixels(meters, zoom);
   return pixelsToTile(pixels)
@@ -167,10 +179,13 @@ }
  * @example
- * const meters = pixelsToMeters([1782579, 1280877, 13])
+ * var meters = pixelsToMeters([1782579, 1280877, 13])
  * //=[ 14026252.0, 4439099.5 ]
  */
 function pixelsToMeters (pixels, tileSize) {
-  const [px, py, zoom] = validatePixels(pixels);
-  const res = resolution(zoom, tileSize);
-  let mx = px * res - originShift;
-  let my = py * res - originShift;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
+  var res = resolution(zoom, tileSize);
+  var mx = px * res - originShift;
+  var my = py * res - originShift;
   mx = Number(mx.toFixed(1));
@@ -188,12 +203,16 @@ my = Number(my.toFixed(1));
  * @example
- * const tile = pixelsToTile([1782579, 1280877, 13])
+ * var tile = pixelsToTile([1782579, 1280877, 13])
  * //=[ 6963, 5003, 13 ]
  */
-function pixelsToTile (pixels, tileSize = 256) {
-  const [px, py, zoom] = validatePixels(pixels);
+function pixelsToTile (pixels, tileSize) {
+  tileSize = tileSize || 256;
+  validatePixels(pixels);
+  var px = pixels[0];
+  var py = pixels[1];
+  var zoom = pixels[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  let tx = Math.ceil(px / tileSize) - 1;
-  let ty = Math.ceil(py / tileSize) - 1;
+  var tx = Math.ceil(px / tileSize) - 1;
+  var ty = Math.ceil(py / tileSize) - 1;
   if (tx < 0) {
@@ -218,9 +237,13 @@ tx = 0;
  * @example
- * const bbox = tileToBBoxMeters([6963, 5003, 13])
+ * var bbox = tileToBBoxMeters([6963, 5003, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
-function tileToBBoxMeters (tile, tileSize = 256) {
-  const [tx, ty, zoom] = validateTile(tile);
-  let min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
-  let max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
+function tileToBBoxMeters (tile, tileSize) {
+  tileSize = tileSize || 256;
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
+  var min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom]);
+  var max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -238,13 +261,20 @@ }
  * @example
- * const bbox = tileToBBox([6963, 5003, 13])
+ * var bbox = tileToBBox([6963, 5003, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function tileToBBox (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [-180, -85.051129, 180, 85.051129]
   }
-  const [mx1, my1, mx2, my2] = tileToBBoxMeters([tx, ty, zoom]);
-  const min = metersToLngLat([mx1, my1, zoom]);
-  const max = metersToLngLat([mx2, my2, zoom]);
+  var bbox = tileToBBoxMeters([tx, ty, zoom]);
+  var mx1 = bbox[0];
+  var my1 = bbox[1];
+  var mx2 = bbox[2];
+  var my2 = bbox[3];
+  var min = metersToLngLat([mx1, my1, zoom]);
+  var max = metersToLngLat([mx2, my2, zoom]);
   return [min[0], min[1], max[0], max[1]]
@@ -259,7 +289,7 @@ }
  * @example
- * const bbox = googleToBBoxMeters([6963, 3188, 13])
+ * var bbox = googleToBBoxMeters([6963, 3188, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
 function googleToBBoxMeters (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBoxMeters(Tile)
@@ -274,7 +304,7 @@ }
  * @example
- * const bbox = googleToBBox([6963, 3188, 13])
+ * var bbox = googleToBBox([6963, 3188, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 function googleToBBox (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToBBox(Tile)
@@ -289,12 +319,15 @@ }
  * @example
- * const google = tileToGoogle([6963, 5003, 13])
+ * var google = tileToGoogle([6963, 5003, 13])
  * //=[ 6963, 3188, 13 ]
  */
 function tileToGoogle (tile) {
-  const [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  const x = tx;
-  const y = (Math.pow(2, zoom) - 1) - ty;
+  var x = tx;
+  var y = (Math.pow(2, zoom) - 1) - ty;
   return [x, y, zoom]
@@ -309,9 +342,11 @@ }
  * @example
- * const tile = googleToTile([6963, 3188, 13])
+ * var tile = googleToTile([6963, 3188, 13])
  * //=[ 6963, 5003, 13 ]
  */
 function googleToTile (google) {
-  const [x, y, zoom] = google;
-  const tx = x;
-  const ty = Math.pow(2, zoom) - y - 1;
+  var x = google[0];
+  var y = google[1];
+  var zoom = google[2];
+  var tx = x;
+  var ty = Math.pow(2, zoom) - y - 1;
   return [tx, ty, zoom]
@@ -326,7 +361,7 @@ }
  * @example
- * const quadkey = googleToQuadkey([6963, 3188, 13])
+ * var quadkey = googleToQuadkey([6963, 3188, 13])
  * //='1321102330211'
  */
 function googleToQuadkey (google) {
-  const Tile = googleToTile(google);
+  var Tile = googleToTile(google);
   return tileToQuadkey(Tile)
@@ -341,7 +376,10 @@ }
  * @example
- * const quadkey = tileToQuadkey([6963, 5003, 13])
+ * var quadkey = tileToQuadkey([6963, 5003, 13])
  * //='1321102330211'
  */
 function tileToQuadkey (tile) {
-  let [tx, ty, zoom] = validateTile(tile);
+  validateTile(tile);
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   // Zoom 0 does not exist for Quadkey
@@ -351,7 +389,7 @@ if (zoom === 0) {
   }
-  let quadkey = '';
+  var quadkey = '';
   ty = (Math.pow(2, zoom) - 1) - ty;
-  range(zoom, 0, -1).map(i => {
-    let digit = 0;
-    let mask = 1 << (i - 1);
+  range(zoom, 0, -1).map(function (i) {
+    var digit = 0;
+    var mask = 1 << (i - 1);
     if ((tx & mask) !== 0) {
@@ -374,7 +412,7 @@ digit += 1;
  * @example
- * const tile = quadkeyToTile('1321102330211')
+ * var tile = quadkeyToTile('1321102330211')
  * //=[ 6963, 5003, 13 ]
  */
 function quadkeyToTile (quadkey) {
-  const Google = quadkeyToGoogle(quadkey);
+  var Google = quadkeyToGoogle(quadkey);
   return googleToTile(Google)
@@ -389,11 +427,11 @@ }
  * @example
- * const google = quadkeyToGoogle('1321102330211')
+ * var google = quadkeyToGoogle('1321102330211')
  * //=[ 6963, 3188, 13 ]
  */
 function quadkeyToGoogle (quadkey) {
-  let x = 0;
-  let y = 0;
-  const zoom = quadkey.length;
-  range(zoom, 0, -1).map(i => {
-    let mask = 1 << (i - 1);
+  var x = 0;
+  var y = 0;
+  var zoom = quadkey.length;
+  range(zoom, 0, -1).map(function (i) {
+    var mask = 1 << (i - 1);
     switch (parseInt(quadkey[zoom - i], 0)) {
@@ -425,8 +463,8 @@ case 0:
  * @example
- * const meters = bboxToMeters([ 125, 35, 127, 37 ])
+ * var meters = bboxToMeters([ 125, 35, 127, 37 ])
  * //=[ 13914936.3, 4163881.1, 14137575.3, 4439106.7 ]
  */
 function bboxToMeters (bbox) {
-  const min = lngLatToMeters([bbox[0], bbox[1]]);
-  const max = lngLatToMeters([bbox[2], bbox[3]]);
+  var min = lngLatToMeters([bbox[0], bbox[1]]);
+  var max = lngLatToMeters([bbox[2], bbox[3]]);
   return [min[0], min[1], max[0], max[1]]
@@ -450,3 +488,5 @@ }
 function validateTile (tile) {
-  const [tx, ty, zoom] = tile;
+  var tx = tile[0];
+  var ty = tile[1];
+  var zoom = tile[2];
   validateZoom(zoom);
@@ -457,3 +497,3 @@ if (tx === undefined || tx === null) { throw new Error('<x> is required') }
   if (ty < 0) { throw new Error('<y> must not be less than 0') }
-  const maxCount = Math.pow(2, zoom);
+  var maxCount = Math.pow(2, zoom);
   if (tx >= maxCount || ty >= maxCount) { throw new Error('Illegal parameters for tile') }
@@ -497,3 +537,4 @@ return tile
 function validateLngLat (lnglat) {
-  const [lng, lat] = lnglat;
+  var lng = lnglat[0];
+  var lat = lnglat[1];
   if (lat === undefined || lat === null) { throw new Error('<lat> is required') }
@@ -531,3 +572,3 @@ if (lng === undefined || lng === null) { throw new Error('<lng> is required') }
  * @example
- * const res = resolution(13)
+ * var res = resolution(13)
  * //=19.109257071294063
@@ -563,5 +604,5 @@ */
   }
-  const length = Math.max(Math.ceil((stop - start) / step), 0);
-  const range = Array(length);
-  for (let idx = 0; idx < length; idx++, start += step) {
+  var length = Math.max(Math.ceil((stop - start) / step), 0);
+  var range = Array(length);
+  for (var idx = 0; idx < length; idx++, start += step) {
     range[idx] = start;
@@ -568,0 +609,0 @@ }

index.js

@@ -1,3 +0,6 @@
-const originShift = 2 * Math.PI * 6378137 / 2.0
-function initialResolution (tileSize = 256) { return 2 * Math.PI * 6378137 / tileSize }
+var originShift = 2 * Math.PI * 6378137 / 2.0
+function initialResolution (tileSize) {
+  tileSize = tileSize || 256
+  return 2 * Math.PI * 6378137 / tileSize
+}
 
@@ -10,7 +13,9 @@ /**
  * @example
- * const id = hash([312, 480, 4])
+ * var id = hash([312, 480, 4])
  * //=5728
  */
 export function hash (tile) {
-  const [x, y, z] = tile
+  var x = tile[0]
+  var y = tile[1]
+  var z = tile[2]
   return (1 << z) * ((1 << z) + x) + y
@@ -25,9 +30,12 @@ }
  * @example
- * const center = bboxToCenter([90, -45, 85, -50])
+ * var center = bboxToCenter([90, -45, 85, -50])
  * //= [ 87.5, -47.5 ]
  */
 export function bboxToCenter (bbox) {
-  const [west, south, east, north] = bbox
-  let lng = (west - east) / 2 + east
-  let lat = (south - north) / 2 + north
+  var west = bbox[0]
+  var south = bbox[1]
+  var east = bbox[2]
+  var north = bbox[3]
+  var lng = (west - east) / 2 + east
+  var lat = (south - north) / 2 + north
   lng = Number(lng.toFixed(6))
@@ -44,9 +52,11 @@ lat = Number(lat.toFixed(6))
  * @example
- * const meters = lngLatToMeters([126, 37])
+ * var meters = lngLatToMeters([126, 37])
  * //=[ 14026255.8, 4439106.7 ]
  */
 export function lngLatToMeters (lnglat) {
-  const [lng, lat] = validateLngLat(lnglat)
-  let x = lng * originShift / 180.0
-  let y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0)
+  validateLngLat(lnglat)
+  var lng = lnglat[0]
+  var lat = lnglat[1]
+  var x = lng * originShift / 180.0
+  var y = Math.log(Math.tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0)
   y = y * originShift / 180.0
@@ -64,9 +74,10 @@ x = Number(x.toFixed(1))
  * @example
- * const lnglat = metersToLngLat([14026255, 4439106])
+ * var lnglat = metersToLngLat([14026255, 4439106])
  * //=[ 126, 37 ]
  */
 export function metersToLngLat (meters) {
-  const [x, y] = meters
-  let lng = (x / originShift) * 180.0
-  let lat = (y / originShift) * 180.0
+  var x = meters[0]
+  var y = meters[1]
+  var lng = (x / originShift) * 180.0
+  var lat = (y / originShift) * 180.0
   lat = 180 / Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180.0)) - Math.PI / 2.0)
@@ -86,10 +97,11 @@ lng = Number(lng.toFixed(6))
  * @example
- * const pixels = metersToPixels([14026255, 4439106], 13)
+ * var pixels = metersToPixels([14026255, 4439106], 13)
  * //=[ 1782579.1, 1280877.3, 13 ]
  */
 export function metersToPixels (meters, zoom, tileSize) {
-  const [x, y] = meters
-  const res = resolution(zoom, tileSize)
-  const px = (x + originShift) / res
-  const py = (y + originShift) / res
+  var x = meters[0]
+  var y = meters[1]
+  var res = resolution(zoom, tileSize)
+  var px = (x + originShift) / res
+  var py = (y + originShift) / res
   return [px, py, zoom]
@@ -105,8 +117,8 @@ }
  * @example
- * const tile = lngLatToTile([126, 37], 13)
+ * var tile = lngLatToTile([126, 37], 13)
  * //=[ 6963, 5003, 13 ]
  */
 export function lngLatToTile (lnglat, zoom) {
-  const meters = lngLatToMeters(validateLngLat(lnglat))
-  const pixels = metersToPixels(meters, zoom)
+  var meters = lngLatToMeters(validateLngLat(lnglat))
+  var pixels = metersToPixels(meters, zoom)
   return pixelsToTile(pixels)
@@ -122,3 +134,3 @@ }
  * @example
- * const google = lngLatToGoogle([126, 37], 13)
+ * var google = lngLatToGoogle([126, 37], 13)
  * //=[ 6963, 3188, 13 ]
@@ -130,3 +142,3 @@ */
   }
-  const tile = lngLatToTile(validateLngLat(lnglat), zoom)
+  var tile = lngLatToTile(validateLngLat(lnglat), zoom)
   return tileToGoogle(tile)
@@ -142,3 +154,3 @@ }
  * @example
- * const tile = metersToTile([14026255, 4439106], 13)
+ * var tile = metersToTile([14026255, 4439106], 13)
  * //=[ 6963, 5003, 13 ]
@@ -150,3 +162,3 @@ */
   }
-  const pixels = metersToPixels(meters, zoom)
+  var pixels = metersToPixels(meters, zoom)
   return pixelsToTile(pixels)
@@ -162,10 +174,13 @@ }
  * @example
- * const meters = pixelsToMeters([1782579, 1280877, 13])
+ * var meters = pixelsToMeters([1782579, 1280877, 13])
  * //=[ 14026252.0, 4439099.5 ]
  */
 export function pixelsToMeters (pixels, tileSize) {
-  const [px, py, zoom] = validatePixels(pixels)
-  const res = resolution(zoom, tileSize)
-  let mx = px * res - originShift
-  let my = py * res - originShift
+  validatePixels(pixels)
+  var px = pixels[0]
+  var py = pixels[1]
+  var zoom = pixels[2]
+  var res = resolution(zoom, tileSize)
+  var mx = px * res - originShift
+  var my = py * res - originShift
   mx = Number(mx.toFixed(1))
@@ -183,12 +198,16 @@ my = Number(my.toFixed(1))
  * @example
- * const tile = pixelsToTile([1782579, 1280877, 13])
+ * var tile = pixelsToTile([1782579, 1280877, 13])
  * //=[ 6963, 5003, 13 ]
  */
-export function pixelsToTile (pixels, tileSize = 256) {
-  const [px, py, zoom] = validatePixels(pixels)
+export function pixelsToTile (pixels, tileSize) {
+  tileSize = tileSize || 256
+  validatePixels(pixels)
+  var px = pixels[0]
+  var py = pixels[1]
+  var zoom = pixels[2]
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  let tx = Math.ceil(px / tileSize) - 1
-  let ty = Math.ceil(py / tileSize) - 1
+  var tx = Math.ceil(px / tileSize) - 1
+  var ty = Math.ceil(py / tileSize) - 1
   if (tx < 0) {
@@ -213,9 +232,13 @@ tx = 0
  * @example
- * const bbox = tileToBBoxMeters([6963, 5003, 13])
+ * var bbox = tileToBBoxMeters([6963, 5003, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
-export function tileToBBoxMeters (tile, tileSize = 256) {
-  const [tx, ty, zoom] = validateTile(tile)
-  let min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom])
-  let max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom])
+export function tileToBBoxMeters (tile, tileSize) {
+  tileSize = tileSize || 256
+  validateTile(tile)
+  var tx = tile[0]
+  var ty = tile[1]
+  var zoom = tile[2]
+  var min = pixelsToMeters([tx * tileSize, ty * tileSize, zoom])
+  var max = pixelsToMeters([(tx + 1) * tileSize, (ty + 1) * tileSize, zoom])
   return [min[0], min[1], max[0], max[1]]
@@ -233,13 +256,20 @@ }
  * @example
- * const bbox = tileToBBox([6963, 5003, 13])
+ * var bbox = tileToBBox([6963, 5003, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 export function tileToBBox (tile) {
-  const [tx, ty, zoom] = validateTile(tile)
+  validateTile(tile)
+  var tx = tile[0]
+  var ty = tile[1]
+  var zoom = tile[2]
   if (zoom === 0) {
     return [-180, -85.051129, 180, 85.051129]
   }
-  const [mx1, my1, mx2, my2] = tileToBBoxMeters([tx, ty, zoom])
-  const min = metersToLngLat([mx1, my1, zoom])
-  const max = metersToLngLat([mx2, my2, zoom])
+  var bbox = tileToBBoxMeters([tx, ty, zoom])
+  var mx1 = bbox[0]
+  var my1 = bbox[1]
+  var mx2 = bbox[2]
+  var my2 = bbox[3]
+  var min = metersToLngLat([mx1, my1, zoom])
+  var max = metersToLngLat([mx2, my2, zoom])
   return [min[0], min[1], max[0], max[1]]
@@ -254,7 +284,7 @@ }
  * @example
- * const bbox = googleToBBoxMeters([6963, 3188, 13])
+ * var bbox = googleToBBoxMeters([6963, 3188, 13])
  * //=[ 14025277.4, 4437016.6, 14030169.4, 4441908.5 ]
  */
 export function googleToBBoxMeters (google) {
-  const Tile = googleToTile(google)
+  var Tile = googleToTile(google)
   return tileToBBoxMeters(Tile)
@@ -269,7 +299,7 @@ }
  * @example
- * const bbox = googleToBBox([6963, 3188, 13])
+ * var bbox = googleToBBox([6963, 3188, 13])
  * //=[ 125.991, 36.985, 126.035, 37.020 ]
  */
 export function googleToBBox (google) {
-  const Tile = googleToTile(google)
+  var Tile = googleToTile(google)
   return tileToBBox(Tile)
@@ -284,12 +314,15 @@ }
  * @example
- * const google = tileToGoogle([6963, 5003, 13])
+ * var google = tileToGoogle([6963, 5003, 13])
  * //=[ 6963, 3188, 13 ]
  */
 export function tileToGoogle (tile) {
-  const [tx, ty, zoom] = validateTile(tile)
+  validateTile(tile)
+  var tx = tile[0]
+  var ty = tile[1]
+  var zoom = tile[2]
   if (zoom === 0) {
     return [0, 0, 0]
   }
-  const x = tx
-  const y = (Math.pow(2, zoom) - 1) - ty
+  var x = tx
+  var y = (Math.pow(2, zoom) - 1) - ty
   return [x, y, zoom]
@@ -304,9 +337,11 @@ }
  * @example
- * const tile = googleToTile([6963, 3188, 13])
+ * var tile = googleToTile([6963, 3188, 13])
  * //=[ 6963, 5003, 13 ]
  */
 export function googleToTile (google) {
-  const [x, y, zoom] = google
-  const tx = x
-  const ty = Math.pow(2, zoom) - y - 1
+  var x = google[0]
+  var y = google[1]
+  var zoom = google[2]
+  var tx = x
+  var ty = Math.pow(2, zoom) - y - 1
   return [tx, ty, zoom]
@@ -321,7 +356,7 @@ }
  * @example
- * const quadkey = googleToQuadkey([6963, 3188, 13])
+ * var quadkey = googleToQuadkey([6963, 3188, 13])
  * //='1321102330211'
  */
 export function googleToQuadkey (google) {
-  const Tile = googleToTile(google)
+  var Tile = googleToTile(google)
   return tileToQuadkey(Tile)
@@ -336,7 +371,10 @@ }
  * @example
- * const quadkey = tileToQuadkey([6963, 5003, 13])
+ * var quadkey = tileToQuadkey([6963, 5003, 13])
  * //='1321102330211'
  */
 export function tileToQuadkey (tile) {
-  let [tx, ty, zoom] = validateTile(tile)
+  validateTile(tile)
+  var tx = tile[0]
+  var ty = tile[1]
+  var zoom = tile[2]
   // Zoom 0 does not exist for Quadkey
@@ -346,7 +384,7 @@ if (zoom === 0) {
   }
-  let quadkey = ''
+  var quadkey = ''
   ty = (Math.pow(2, zoom) - 1) - ty
-  range(zoom, 0, -1).map(i => {
-    let digit = 0
-    let mask = 1 << (i - 1)
+  range(zoom, 0, -1).map(function (i) {
+    var digit = 0
+    var mask = 1 << (i - 1)
     if ((tx & mask) !== 0) {
@@ -369,7 +407,7 @@ digit += 1
  * @example
- * const tile = quadkeyToTile('1321102330211')
+ * var tile = quadkeyToTile('1321102330211')
  * //=[ 6963, 5003, 13 ]
  */
 export function quadkeyToTile (quadkey) {
-  const Google = quadkeyToGoogle(quadkey)
+  var Google = quadkeyToGoogle(quadkey)
   return googleToTile(Google)
@@ -384,11 +422,11 @@ }
  * @example
- * const google = quadkeyToGoogle('1321102330211')
+ * var google = quadkeyToGoogle('1321102330211')
  * //=[ 6963, 3188, 13 ]
  */
 export function quadkeyToGoogle (quadkey) {
-  let x = 0
-  let y = 0
-  const zoom = quadkey.length
-  range(zoom, 0, -1).map(i => {
-    let mask = 1 << (i - 1)
+  var x = 0
+  var y = 0
+  var zoom = quadkey.length
+  range(zoom, 0, -1).map(function (i) {
+    var mask = 1 << (i - 1)
     switch (parseInt(quadkey[zoom - i], 0)) {
@@ -420,8 +458,8 @@ case 0:
  * @example
- * const meters = bboxToMeters([ 125, 35, 127, 37 ])
+ * var meters = bboxToMeters([ 125, 35, 127, 37 ])
  * //=[ 13914936.3, 4163881.1, 14137575.3, 4439106.7 ]
  */
 export function bboxToMeters (bbox) {
-  const min = lngLatToMeters([bbox[0], bbox[1]])
-  const max = lngLatToMeters([bbox[2], bbox[3]])
+  var min = lngLatToMeters([bbox[0], bbox[1]])
+  var max = lngLatToMeters([bbox[2], bbox[3]])
   return [min[0], min[1], max[0], max[1]]
@@ -445,3 +483,5 @@ }
 export function validateTile (tile) {
-  const [tx, ty, zoom] = tile
+  var tx = tile[0]
+  var ty = tile[1]
+  var zoom = tile[2]
   validateZoom(zoom)
@@ -452,3 +492,3 @@ if (tx === undefined || tx === null) { throw new Error('<x> is required') }
   if (ty < 0) { throw new Error('<y> must not be less than 0') }
-  const maxCount = Math.pow(2, zoom)
+  var maxCount = Math.pow(2, zoom)
   if (tx >= maxCount || ty >= maxCount) { throw new Error('Illegal parameters for tile') }
@@ -492,3 +532,4 @@ return tile
 export function validateLngLat (lnglat) {
-  const [lng, lat] = lnglat
+  var lng = lnglat[0]
+  var lat = lnglat[1]
   if (lat === undefined || lat === null) { throw new Error('<lat> is required') }
@@ -526,3 +567,3 @@ if (lng === undefined || lng === null) { throw new Error('<lng> is required') }
  * @example
- * const res = resolution(13)
+ * var res = resolution(13)
  * //=19.109257071294063
@@ -558,5 +599,5 @@ */
   }
-  const length = Math.max(Math.ceil((stop - start) / step), 0)
-  const range = Array(length)
-  for (let idx = 0; idx < length; idx++, start += step) {
+  var length = Math.max(Math.ceil((stop - start) / step), 0)
+  var range = Array(length)
+  for (var idx = 0; idx < length; idx++, start += step) {
     range[idx] = start
@@ -563,0 +604,0 @@ }

package.json

 {
   "name": "global-mercator",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "description": "Tools to help with TMS, Quadkey & Google (XYZ) Tiles",
@@ -33,3 +33,3 @@ "main": "dist/global-mercator.js",
     "typescript": "^2.1.5",
-    "uglify-js": "git://github.com/mishoo/UglifyJS2.git#harmony"
+    "uglify-js": "^2.7.5"
   },
@@ -36,0 +36,0 @@ "keywords": [

README.md

@@ -24,3 +24,3 @@ # [Global Mercator](https://www.npmjs.com/package/global-mercator)
 
-**web browser ([ES6](https://kangax.github.io/compat-table/es6))**
+**web browser ([ES5](https://kangax.github.io/compat-table/es5))**
 
@@ -27,0 +27,0 @@ ```html

No alert changes

Improved metrics

Total package byte prevSize

176338

increased by4.81%

Lines of code

2309

increased by7.65%

No dependency changes