This updates ESLint and our shared eslint-config-openlayers to use Prettier. Most formatting changes were automatically applied with this:
npm run lint -- --fix
A few manual changes were required:
* In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
* In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason. While editing this, I reworked `ExampleBuilder` to be a class.
* In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.
Previously the expression was parsed in the fragment shader context, which
meant in case the expression used an attributes the resulting GLSL code
would be wrong.
Fragment shader context:
`float angle = v_heading; // we're using the varying: not OK`
Vertex shader context:
`float angle = a_heading; // we're using the attribute: OK`
Now values which are not mentioned in the style are still added to
the string literals mapping.
Also an error will be thrown if a style references a missing variable.
Type checking is done either against a literal value (number, string...)
or against the operator in case of an expression.
Sometimes it is not possible to infer only one type, for example
the value 'transparent' could either be a color or a string. This
is covered by the fact that all operators expect exactly one type
for their arguments.
These variables are accessed using the `var` operator, and are meant
to be mutated directly in the style object. When doing so,
the new value will always be used for the render.
This is intended to be used for modifying the style through external
parameters such as an input field, a slider, mouse position etc.
There is now a ShaderBuilder class with chainable methods
to specify more easily the contents of the final shaders.
This is to avoid passing around large objects to different functions,
and allow for a richer API.
The documentation has also been corrected and clarified.
