Remove goog.asserts.*

This pull requests replaces type check hint assertions with type casts,
library sanity check assertions with conditional console.assert statements
in debug mode, and runtime sanity checks with assertions that throw an
ol.AssertionError with an error code for lookup outside the library.

doc/errors.md

@@ -0,0 +1,222 @@
+---
+title: Errors
+layout: doc.hbs
+---
+
+# Errors
+
+### 1
+
+The view center is not defined.
+
+### 2
+
+The view resolution is not defined.
+
+### 3
+
+The view rotation is not defined.
+
+### 4
+
+`image` and `src` cannot be provided at the same time.
+
+### 5
+
+`imgSize` must be set when `image` is provided.
+
+### 6
+
+A defined and non-empty `src` or `image` must be provided.
+
+### 7
+
+`format` must be set when `url` is set.
+
+### 8
+
+Unknown `serverType` configured.
+
+### 9
+
+`url` must be configured or set using `#setUrl()`.
+
+### 10
+
+The default `geometryFunction` can only handle `ol.geom.Point` geometries.
+
+### 11
+
+`options.featureTypes` should be an Array.
+
+### 12
+
+`options.geometryName` must also be provided when `options.bbox` is set.
+
+### 13
+
+Invalid corner. Valid corners are `top-left`, `top-right`, `bottom-right` and `bottom-left`.
+
+### 14
+
+Invalid color. Valid colors are all [CSS colors](https://developer.mozilla.org/en-US/docs/Web/CSS/color).
+
+### 15
+
+Tried to get a value for a key that does not exist in the cache.
+
+### 16
+
+Tried to set a value for a key that is used already.
+
+### 17
+
+`resolutions` must be sorted in descending order.
+
+### 18
+
+Either `origin` or `origins` must be configured, never both.
+
+### 19
+
+Number of `tileSizes` and `resolutions` must be equal.
+
+### 20
+
+Number of `origins` and `resolutions` must be equal.
+
+### 21
+
+Tile range for `extent` must not exceed tilegrid width and height.
+
+### 22
+
+Either `tileSize` or `tileSizes` must be configured, never both.
+
+### 23
+
+The passed `ol.TileCoord`s must all have the same `z` value.
+
+### 24
+
+Invalid extent or geometry provided as `geometry`.
+
+### 25
+
+Cannot fit empty extent provided as `geometry`.
+
+### 26
+
+Features for `deletes` must have an id set by the feature reader or  `ol.Feature#setId()`.
+
+### 27
+
+Features for `updates` must have an id set by the feature reader or `ol.Feature#setId()`.
+
+### 28
+
+`renderMode` must be `'image'`, `'hybrid'` or `'vector'`.
+
+### 29
+
+`x` must be greater than `0`.
+
+### 30
+
+The passed `feature` was already added to the source.
+
+### 31
+
+Tried to enqueue an `element` that was already added to the queue.
+
+### 32
+
+Transformation matrix cannot be inverted.
+
+### 33
+
+Invalid `units`. `'degrees'`, `'imperial'`, `'nautical'`, `'metric'` or `'us'` required.
+
+### 34
+
+Invalid geometry layout. Must be `XY`, `XYZ`, `XYM` or `XYZM`.
+
+### 35
+
+Unknown GeoJSON object type. Expected `"Feature"` or `"FeatureCollection"`.
+
+### 36
+
+Unknown SRS type. Expected `"name"` or `"EPSG"`.
+
+### 37
+
+Unknown geometry type found. Expected `'Point'`, `'LineString'`, `'Polygon'` or `'GeometryCollection'`.
+
+### 38
+
+`styleMapValue` has an unknown type.
+
+### 39
+
+Unknown geometry type found. Expected `'GeometryCollection'`, `'MultiPoint'`, `'MultiLineString'` or `'MultiPolygon'`.
+
+### 40
+
+Expected `feature` to have a geometry.
+
+### 41
+
+Expected an `ol.style.Style` or an array of `ol.style.Style`.
+
+### 42
+
+Expected an `ol.Feature`, but got an `ol.RenderFeature`.
+
+### 43
+
+Expected `layers` to be an array or an `ol.Collection`.
+
+### 44
+
+`logo.href` should be a string.
+
+### 45
+
+`logo.src` should be a string.
+
+### 46
+
+Incorrect format for `renderer` option.
+
+### 47
+
+Expected `controls` to be an array or an `ol.Collection`.
+
+### 48
+
+Expected `interactions` to be an array or an `ol.Collection`.
+
+### 49
+
+Expected `overlays` to be an array or an `ol.Collection`.
+
+### 50
+
+Cannot determine Rest Service from url.
+
+### 51
+
+Either `url` or `tileJSON` options must be provided.
+
+### 52
+
+Unknown `serverType` configured.
+
+### 53
+
+Unknown `tierSizeCalculation` configured.
+
+### 54
+
+Hex color should have 3 or 6 digits.