assign タグのフォーマット規則（Prettier）

It should never break a name
printWidth: 1
{% assign z = x %}

It should break before/after delimiters and indent everything
printWidth: 1
{% assign z = x | filter1 | filter2 %}

It should break and indent named arguments
printWidth: 1
{% assign z = x | filter1: key1: value1, key2: value2 | filter2 %}

It should not break the first positional argument
printWidth: 1
{% assign z = x | filter1: arg1 | filter2: arg2, arg3, arg4 %}

It should break arguments only if necessary
printWidth: 40
{% assign z = x | filter1: key1: value1, key2: value2 | filter2 %}

It should support a mix of positional and named arguments as expected (p1)
printWidth: 1
{% assign z = x | filter1: pos1, pos2, key1: val1, key2: val2 %}

It should support a mix of positional and named arguments as expected (p50)
printWidth: 50
{% assign z = x | filter1: pos1, pos2, key1: val1, key2: val2 %}

It should support a mix of positional and named arguments as expected (p80)
printWidth: 80
{% assign z = x | filter1: pos1, pos2, key1: val1, key2: val2 %}

It should support all types of arguments, and add spaces
{% assign z=x|f:'string' %}
{% assign z=x|f:"string" %}
{% assign z=x|f:0.0 %}
{% assign z=x|f:0 %}
{% assign z=x|f:x %}
{% assign z=x|f:(0..a) %}
{% assign z=x|f:true %}

It should support all types of named arguments, and add spaces
{% assign z=x|f:key:'string' %}
{% assign z=x|f:key:"string" %}
{% assign z=x|f:key:0.0 %}
{% assign z=x|f:key:0 %}
{% assign z=x|f:key:x %}
{% assign z=x|f:key:(0..a) %}
{% assign z=x|f:key:true %}

It should support spaces or lack of thereof erywhere
{% assign z =   x|f:
a    :  b  , range
: ( a .. b)
%}